47 gainsford road, london e17 6qb - · pdf filedaylight and sunlight study 47 gainsford road,...

Daylight and Sunlight Study

47 Gainsford Road, London E17 6QB

4 May 2016

DAYLIGHT AND SUNLIGHT STUDY47 Gainsford Road, London E17 6QB

Right of Light Consulting

Burley House15-17 High StreetRayleighEssex SS6 7EW

Tel: 0800 197 4836

DAYLIGHT AND SUNLIGHT STUDY Page 147 Gainsford Road, London E17 6QB

CONTENTS

1 EXECUTIVE SUMMARY ...................................................................................................2

1.1 Overview ..................................................................................................................2

2 INFORMATION SOURCES...............................................................................................3

2.1 Documents Considered ............................................................................................3

3 METHODOLOGY OF THE STUDY ...................................................................................4

3.1 BRE Guide : Site Layout Planning for Daylight and Sunlight.....................................43.2 Daylight to Windows .................................................................................................43.3 Sunlight availability to Windows ................................................................................53.4 Overshadowing to Gardens and Open Spaces .........................................................5

4 RESULTS OF THE STUDY...............................................................................................7

4.1 Windows & Amenity Areas Considered.....................................................................74.2 Numerical Results.....................................................................................................74.3 Daylight to Windows .................................................................................................74.4 Sunlight to Windows .................................................................................................74.5 Overshadowing to Gardens and Open Spaces .........................................................74.6 Conclusion................................................................................................................7

5 CLARIFICATIONS ............................................................................................................9

5.1 General.....................................................................................................................95.2 Project Specific.........................................................................................................9

APPENDICES

APPENDIX 1 WINDOW & GARDEN KEYAPPENDIX 2 DAYLIGHT AND SUNLIGHT RESULTSAPPENDIX 3 OVERSHADOWING TO GARDENS AND OPEN SPACES

DAYLIGHT AND SUNLIGHT STUDY47 Gainsford Road, London E17 6QB Page 2

1 EXECUTIVE SUMMARY

1.1 Overview

1.1.1 Right of Light Consulting has been commissioned by Pocket Living (2013) LLP to

undertake a daylight and sunlight study of the proposed development at 47 Gainsford

Road, London E17 6QB.

1.1.2 The aim of the study is to assess the impact of the development on the light

receivable by the neighbouring properties at 39 to 49A & 38 to 58 Gainsford Road

and 38 to 58 & 65 to 81 Erskine Road. The study is based on the various numerical

tests laid down in the Building Research Establishment (BRE) guide ‘Site Layout

Planning for Daylight and Sunlight: a guide to good practice’ by P J Littlefair 2011.

1.1.3 The window key in Appendix 1 identifies the windows analysed in this study.

Appendix 2 gives the numerical results of the various daylight and sunlight tests.

1.1.4 The results confirm that the development will have a low impact on the light

receivable by its neighbouring properties. In our opinion there is no daylight or

sunlight related reason why planning permission should not be granted for this

scheme.


2 INFORMATION SOURCES

2.1 Documents Considered

2.1.1 This report is based on drawings:

GORT SCOTT Architect’s

10-00 Proposed Site Plan Rev –10-10 Proposed Ground Floor Rev C10-11 Proposed First Floor Rev B10-12 Proposed Second Floor Rev B10-13 Proposed Third Floor Rev B10-14 Proposed Roof Plan Rev B20-10 Proposed South and West Elevations Rev A20-11 Proposed North and East Elevations Rev A30-10 Proposed Section AA Rev B30-11 Proposed Section BB Rev B


3 METHODOLOGY OF THE STUDY

3.1 BRE Guide : Site Layout Planning for Daylight and Sunlight

3.1.1 The study is based on the various numerical tests laid down in the Building Research

Establishment (BRE) guide ‘Site Layout Planning for Daylight and Sunlight: a guide to

good practice’ by P J Littlefair 2011. In general, the BRE tests are based on the

requirements of the British Standard, BS 8206 Part 2.

3.1.2 The standards set out in the BRE guide are intended to be used flexibly. The

following statement is quoted directly from the BRE guide:

3.1.3 “The guide is intended for building designers and their clients, consultants and

planning officials. The advice given here is not mandatory and the guide should not

be seen as an instrument of planning policy; its aim is to help rather than constrain

the designer. Although it gives numerical guidelines, these should be interpreted

flexibly, since natural lighting is only one of many factors in site layout design.”

3.2 Daylight to Windows

3.2.1 Diffuse daylight is the light received from the sun which has been diffused through the

sky. Even on a cloudy day, when the sun is not visible, a room will continue to be lit

with light from the sky. This is diffuse daylight.

Diffuse daylight calculations should be undertaken to all rooms where daylight is

required, including living rooms, kitchens and bedrooms. Usually, if a kitchen is less

than 13m2, it is considered to be a non-habitable room and the daylight tests need not

be applied. The BRE guide states that windows to bathrooms, toilets, storerooms,

circulation areas and garages need not be analysed.

3.2.2 The BRE guide contains two tests which measure diffuse daylight:

3.2.3 Test 1 Vertical Sky Component

The percentage of the sky visible from the centre of a window is known as the

Vertical Sky Component. Diffuse daylight may be adversely affected if after a

development the Vertical Sky Component is both less than 27% and less than 0.8

times its former value.


3.2.4 Test 2 Daylight Distribution

The BRE guide states that where room layouts are known, the impact on the

daylighting distribution can be found by plotting the ‘no sky line’ in each of the main

rooms. The no sky line is a line which separates areas of the working plane that do

and do not have a direct view of the sky. Daylight may be adversely affected if, after

the development, the area of the working plane in a room which can receive direct

skylight is reduced to less than 0.8 times its former value.

3.3 Sunlight availability to Windows

3.3.1 The BRE sunlight tests should be applied to all main living rooms and conservatories

which have a window which faces within 90 degrees of due south. The guide states

that kitchens and bedrooms are less important, although care should be taken not to

block too much sunlight.

3.3.2 The BRE guide states that sunlight availability may be adversely affected if the centre

of the window:

receives less than 25% of annual probable sunlight hours, or less than 5% of

annual probable sunlight hours between 21 September and 21 March and

receives less than 0.8 times its former sunlight hours during either period and

has a reduction in sunlight received over the whole year greater than 4% of

annual probable sunlight hours.

3.4 Overshadowing to Gardens and Open Spaces

3.4.1 The availability of sunlight should be checked for all open spaces where sunlight is

required. This would normally include:

Gardens, usually the main back garden of a house Parks and playing fields Children’s playgrounds Outdoor swimming pools and paddling pools Sitting out areas, such as those between non-domestic buildings and in public

squares Focal points for views such as a group of monuments or fountains.


3.4.2 The BRE guide recommends that at least 50% of the area of each amenity space

listed above should receive at least two hours of sunlight on 21 March. If as a result

of new development an existing garden or amenity area does not meet the above,

and the area which can receive two hours of sunlight on 21 March is less than 0.8

times its former value, then the loss of light is likely to be noticeable.


4 RESULTS OF THE STUDY

4.1 Windows & Amenity Areas Considered

4.1.1 Appendix 1 provides a plan and photographs to indicate the positions of the windows

and gardens analysed in this study.

4.2 Numerical Results

4.2.1 Appendix 2 lists the detailed numerical daylight and sunlight test results. The results

are interpreted below.

4.3 Daylight to Windows

4.3.1 All main habitable room windows pass the Vertical Sky Component test. The

proposed development therefore satisfies the BRE daylight requirements.

4.4 Sunlight to Windows

4.4.1 All windows which face within 90 degrees of due south have been tested for direct

sunlight. All main habitable room windows pass both the total annual sunlight hours

test and the winter sunlight hours test (annual probable sunlight hours between 21

September and 21 March). The proposed development therefore satisfies the BRE

direct sunlight to windows requirements.


4.5.1 The results of the overshadowing test show that each of the gardens after the

development receive at least two hours of sunlight on 21 March to at least 50% of its

area with the exception of Garden 13 at 45A Gainsford Road. However, Garden 13

receives less than the recommended amount of sunlight before the proposed

development. This is a result of the garden being north facing and the urban location

of the site. We are therefore of the opinion that it is impractical to avoid the minor

transgression of the BRE recommendations in this instance.

4.6 Conclusion

4.6.1 The results confirm that the development will have a low impact on the light

receivable by its neighbouring properties. In our opinion there is no daylight or


sunlight related reason why planning permission should not be granted for this

scheme.


5 CLARIFICATIONS

5.1 General

5.1.1 The report provided is solely for the use of the client and no liability to anyone else is

accepted.

5.1.2 We have undertaken the survey following the guidelines of the RICS publication

“Surveying Safely”.

5.1.3 We have used our best endeavours to ensure all relevant windows within the

neighbouring properties have been identified.

5.1.4 Where limited access is available, reasonable assumptions will have been made.

5.1.5 We have adopted the conventional approach of assessing all habitable rooms within

domestic properties.

5.1.6 Right of Light Consulting have endeavoured to include in the report those matters,

which they have knowledge of or of which they have been made aware, that might

adversely affect the validity of the opinion given.

5.2 Project Specific

5.2.1 None


APPENDICES


APPENDIX 1

WINDOW & GARDEN KEY

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Win

do

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Key

Win

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w1

G1

Sca

le:

Rev

Date

Pro

po

sed

Develo

pm

ent

58 Gainsford Road

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Str

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Windows 1 to 3Window 4

Windows 5 & 7Window 6Window 8

Windows 9 & 11Window 10Windows 12 to 14


Windows 21 & 23Window 22

Window 24

Windows 25 & 27Window 26Window 28

Windows 29 to 32

Window 33

Windows 34 to 36

Window 37

Window 38


Window 42

Window 43


Windows 50 to 52

Window 53Window 54

Window 55


Window 59

Window 60




Window 75

Windows 76 & 78Window 77Windows 79 to 82Windows 83 to 85

Window 86

Window 87

Windows 88 & 90Window 89(Roof Light)

(Roof Light)

(Roof Light)

(Roof Light)

(Roof Light)

(Roof Light)

(Roof Light)

(Roof Light)

56 Gainsford Road

54 Gainsford Road

52 Gainsford Road

50 Gainsford Road

48 Gainsford Road

46 Gainsford Road

44 Gainsford Road

42 Gainsford Road

40 Gainsford Road

38 Gainsford Road

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Rev

Date

Pro

pose

d

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81E

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(Roo

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Win

dow

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91

&93

Win

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w92

Win

dow

s

94

&96W

indo

ws

95&

97

Win

do

ws

98&

99W

indo

w10

0

Win

do

w10

1

Win

do

w10

2W

indo

w10

3W

indo

w10

4

Win

do

w10

5W

indo

w10

6W

indo

w10

7

Win

dow

s

108

&10

9

Win

do

w11

0

Win

do

ws

113

to11

5

Win

do

w11

6

Win

dow

s

117

&11

8

Win

do

w11

9W

indo

w12

0

Win

do

ws

121

&12

2

Win

do

w12

3

Win

do

ws

124

&12

5

Win

do

w12

6W

indo

w12

7

Win

do

ws

128

&12

9

Win

do

w13

0W

indo

w13

1W

indo

w13

2

Win

do

ws

133

to13

6

Win

do

w13

7

Win

dow

s

138

to14

0

Win

do

w14

1W

indo

w14

2

Win

do

ws

143

to14

5W

indo

w14

6W

indo

w14

7

Win

do

w14

8

Win

do

w14

9

Win

do

w15

0W

indo

w15

1W

indo

w15

2W

indo

ws

153

&15

4

Win

do

w15

5

Win

do

w15

7

Win

dow

s15

8&

161

Win

dow

s15

9&

160

Win

dow

162

Win

dow

s16

3&

164

79E

rski

neR

oad

77

Ers

kine

Road

75

Ers

kine

Road 7

3E

rski

neR

oad

71

Ers

kine

Road

69

Ers

kine

Road 6

7E

rski

neR

oad

(Roo

fLi

ght)

(Roo

fLi

ght)

(Roo

fLi

ght)

(Roo

fLi

ght)

65

Ers

kine

Road

(Roo

fLi

ght)

Win

do

ws

111

&11

2

Win

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w15

6

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Rev

Date

G1

Proposed

Development

38 Erskine Road

(Roof Light)

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Window 165

Window 166

Window 167

Window 168

Window 169Window 170

Windows 171 & 172

Windows 173 & 174

Window 175Windows

176 to 179

Window 180

Window 181

Window 182

Window 183

Window 184

Windows 185 to187

Windows 188 to190

Window 191


Windows

194 to 197

Windows 198 & 199

(Roof Light)

G2

G3

Windows 200 & 201

Windows

202 to 205

Window 206

Window 207

Window 208

Window 209

Windows 210 & 211

Window 212


Windows

215 to 218

Windows 219 & 220

Window 221

(Roof Light)

Windows 222 & 223

Windows

224 to 227


Window 230

Window 231

Window 232

Windows 233 & 235

Windows

236 to 239

Windows 240 & 241

Windows 242 & 243

Windows

244 to 247


Window 250

Windows 251 & 253

Window 252

Window 254


Windows

257 to 260

Windows 261 & 262

Windows 263 & 264

Windows

265 to 268

Window 269 Window 270

Windows 271 to274

Window 275

Windows 276 & 278

Window 277

Windows

280 to 283

Windows 284, 285 & 287Window 286

G4

G5

G6

G7

G8

G9

G10

G11

40 Erskine Road

42 Erskine Road

44 Erskine Road

46 Erskine Road

48 Erskine Road

50 Erskine Road52 Erskine Road


58 Erskine Road

Window 234

Window 279

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Rev

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G12

Proposed

Development

49A

Gainsford

Road

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Windows288&290

Window289

Windows291&292

Windows293&294

Windows295&296

Windows297&298

Windows299&300

Windows301&302

Windows303&304

Window305

45aGainsfordRoad45GainsfordRoad 43GainsfordRoad

41GainsfordRoad39GainsfordRoad

G16

G13

G14

G15

Neighbouring Windows

38 Gainsford Road

40 Gainsford Road

1

2

3

456

7

8910

11

12

13

14

42 Gainsford Road

44 Gainsford Road

1516

17

18

19

202122

23

242526

2930

31

44 Gainsford Road

46 Gainsford Road

27

28 Roof Light

32

33Roof Light

34

35

383940

46 Gainsford Road

48 Gainsford Road

36

37 Roof Light

41

42 Roof Light

434445

46

47

48

49

50 Gainsford Road

50 Gainsford Road

50

51

52

5354

555657

58

59

Roof Lights

52 Gainsford Road

54 Gainsford Road

606162

63

6465

66

67

68

69

70

717273

74

56 Gainsford Road

58 Gainsford Road

757677

78

7980

81

82

83

84

85

86

878889

90

Roof Light

65 Erskine Road

65 Erskine Road

9192

93

9495

96

97

98

99

65 Erskine Road

67 Erskine Road

100101

102

103

104

105

106

107

108

109

110

Roof Light

111

112

69 Erskine Road

71 Erskine Road

113

114

115

116

117

118

119120

121

122

123

124

125

73 Erskine Road

75 Erskine Road

126127

128

129

130

131

132 Roof Light

133

134

135

136

137

138

139

140

141142

Roof Lights

77 Erskine Road

77 Erskine Road

143144145

146

147

148

149

150

79 Erskine Road

79 Erskine Road

151

152 Roof Light

153

154

155

157

156

81 Erskine Road

58 Erskine Road

158

159

160

161

162

163

164

165166167

168

169

170171

172

Garden 1

56 Erskine Road

56 Erskine Road

173

175

176

177178

179

180

181

182

184

174

Roof Light

183

Garden 2

54 Erskine Road

52 Erskine Road

185188190

191

193

194195

196

197

198

199

Roof Light

200201

Garden 3

Garden 4

186187189

192

52 Erskine Road

50 Erskine Road

202

203204

205

206

207

208

210

211

212

213

214

215

216

217 218

219

220

221 Roof Light

Garden 5

209

48 Erskine Road

48 Erskine Road

222223

224

225226

227

228

229

230

231

232

Garden 6

46 Erskine Road

46 Erskine Road

233

235

236

237

238

240

241

Garden 7

234

239

44 Erskine Road

44 Erskine Road

242

243

244

245

246

247

248

249250251

252

253

Garden 8

42 Erskine Road

40 Erskine Road

254255

256

257

258 259

260

261

262

263

264

265

266267

268

269270

271

275

Garden 9

Garden 10

272273274

38 Erskine Road

38 Erskine Road

276

278

279

280281

282

283

284285

286287

Garden 11

277

39 Gainsford Road

41 Gainsford Road

288289

290

291

292

Garden 12

Garden 13

43 Gainsford Road

45 Gainsford Road

293

294

295

296

Garden 14

Garden 15

45a Gainsford Road

49A Gainsford Road

297

298

299

300

301

302

303

304

305

Garden 16


APPENDIX 2

DAYLIGHT AND SUNLIGHT RESULTS

Reference Use Class

Before After Loss Ratio

38 Gainsford Road

Window 1 Non Habitable 23.5% 22.3% 1.2% 0.95


Window 3 Habitable 35.7% 34.5% 1.2% 0.97





40 Gainsford Road








42 Gainsford Road










44 Gainsford Road





Appendix 2 - Vertical Sky Component


Vertical Sky Component

Reference Use Class











46 Gainsford Road










48 Gainsford Road








50 Gainsford Road







Reference Use Class









52 Gainsford Road









54 Gainsford Road








56 Gainsford Road









Reference Use Class





58 Gainsford Road









65 Erskine Road












67 Erskine Road











Reference Use Class






69 Erskine Road







71 Erskine Road








73 Erskine Road








75 Erskine Road




Window 136 Bedroom 36.7% 35.7% 1.0% 0.97


Reference Use Class






Window 139 Bedroom 32.5% 32.6% -0.1% 1.0

Window 140 Bedroom 39.0% 38.5% 0.5% 0.99



77 Erskine Road









79 Erskine Road








81 Erskine Road

Window 158 Habitable 20.8% 20.9% -0.1% 1.0







Reference Use Class





58 Erskine Road









56 Erskine Road













54 Erskine Road










Reference Use Class











52 Erskine Road










50 Erskine Road














Reference Use Class





48 Erskine Road












46 Erskine Road










44 Erskine Road










Reference Use Class








42 Erskine Road










40 Erskine Road














38 Erskine Road




Reference Use Class














39 Gainsford Road




41 Gainsford Road



43 Gainsford Road



45 Gainsford Road



45a Gainsford Road





49A Gainsford Road


Reference Use Class









Reference Use Class

Before After Loss Ratio Before After Loss Ratio

65 Erskine Road

Window 91 Habitable 55% 54% 1% 0.98 17% 17% 0% 1.0






67 Erskine Road










69 Erskine Road







71 Erskine Road







Appendix 2 - Sunlight to Windows


Sunlight to Windows

Total Sunlight Hours Winter Sunlight Hours

Reference Use Class




Sunlight to Windows



73 Erskine Road








75 Erskine Road

Window 136 Bedroom 58% 58% 0% 1.0 19% 19% 0% 1.0


Window 139 Bedroom 51% 50% 1% 0.98 10% 9% 1% 0.9

Window 140 Bedroom 62% 62% 0% 1.0 21% 21% 0% 1.0



77 Erskine Road




Window 149 Non Habitable 52% 51% 1% 0.98 16% 15% 1% 0.94


79 Erskine Road








Reference Use Class




Sunlight to Windows


81 Erskine Road





58 Erskine Road









56 Erskine Road








54 Erskine Road








Reference Use Class




Sunlight to Windows









52 Erskine Road






50 Erskine Road

Window 209 Habitable 75% 76% -1% 1.01 21% 22% -1% 1.05











48 Erskine Road






Reference Use Class




Sunlight to Windows



46 Erskine Road









44 Erskine Road








42 Erskine Road









40 Erskine Road



Reference Use Class




Sunlight to Windows



Window 271 Habitable 71% 72% -1% 1.01 23% 23% 0% 1.0





38 Erskine Road












Reference

Ratio

58 Erskine Road

Garden 1 59.1 m2 45.89 m2 78% 45.89 m2 78% 0.0 m2 0% 1.0

56 Erskine Road

Garden 2 47.58 m2 42.8 m2 90% 43.17 m2 91% -0.37 m2 -1% 1.01

54 Erskine Road

Garden 3 46.5 m2 41.12 m2 88% 39.55 m2 85% 1.56 m2 3% 0.97

52 Erskine Road

Garden 4 55.09 m2 46.75 m2 85% 40.68 m2 74% 6.07 m2 11% 0.87

50 Erskine Road

Garden 5 46.46 m2 27.71 m2 60% 29.0 m2 62% -1.29 m2 -2% 1.03

48 Erskine Road

Garden 6 52.25 m2 27.49 m2 53% 32.45 m2 62% -4.96 m2 -9% 1.17

46 Erskine Road

Garden 7 65.91 m2 55.56 m2 84% 55.42 m2 84% 0.14 m2 0% 1.0

44 Erskine Road

Garden 8 51.58 m2 42.54 m2 82% 40.21 m2 78% 2.34 m2 4% 0.95

42 Erskine Road

Garden 9 51.96 m2 42.99 m2 83% 42.46 m2 82% 0.53 m2 1% 0.99

40 Erskine Road

Garden 10 53.21 m2 43.12 m2 81% 43.12 m2 81% 0.0 m2 0% 1.0

38 Erskine Road

Garden 11 62.2 m2 51.19 m2 82% 51.19 m2 82% 0.0 m2 0% 1.0

39 Gainsford Road

Garden 12 48.06 m2 17.47 m2 36% 17.47 m2 36% 0.0 m2 0% 1.0

41 Gainsford Road

Garden 16 48.62 m2 16.02 m2 33% 16.02 m2 33% 0.0 m2 0% 1.0

43 Gainsford Road

Garden 15 51.92 m2 20.17 m2 39% 20.17 m2 39% 0.0 m2 0% 1.0

45 Gainsford Road

Appendix 2 - Overshadowing to Gardens and Open Spaces


Total Area Area receiving at least two hours of sunlight on 21st March

Before After Loss

Reference

Appendix 2 - Overshadowing to Gardens and Open Spaces


Total Area Area receiving at least two hours of sunlight on 21st March

Garden 14 45.35 m2 13.83 m2 31% 13.0 m2 29% 0.83 m2 2% 0.94

45a Gainsford Road

Garden 13 52.78 m2 23.56 m2 45% 14.9 m2 28% 8.66 m2 17% 0.62


APPENDIX 3

OVERSHADOWING TO GARDENS AND OPEN SPACES

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G2

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58 Erskine Road

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G12

45aGainsfordRoad

45GainsfordRoad

43GainsfordRoad

41GainsfordRoad

39GainsfordRoad

G16

G13

G14

G15

Daylight and Sunlight Study (Within Development)47 Gainsford Road, London E17 6QB

12 May 2016


Right of Light Consulting

Burley House15-17 High StreetRayleighEssex SS6 7EW

Tel: 0800 197 4836

DAYLIGHT AND SUNLIGHT STUDY Page 147 Gainsford Road, London E17 6QB

CONTENTS

1 EXECUTIVE SUMMARY ...................................................................................................2

1.1 Overview ..................................................................................................................2

2 INFORMATION SOURCES...............................................................................................3

2.1 Documents Considered ............................................................................................3

3 METHODOLOGY OF THE STUDY ...................................................................................4

3.1 BRE Guide : Site Layout Planning for Daylight and Sunlight.....................................43.2 Interior Daylighting....................................................................................................43.3 Sunlight to Windows .................................................................................................6

4 RESULTS OF THE STUDY...............................................................................................8

4.1 Window Reference Points.........................................................................................84.2 Numerical Results and No Sky Line Contours ..........................................................84.3 Interior Daylighting....................................................................................................84.4 Sunlight to Windows .................................................................................................84.5 Conclusion................................................................................................................8

5 CLARIFICATIONS ............................................................................................................9

5.1 General.....................................................................................................................95.2 Project Specific.........................................................................................................9

APPENDICES

APPENDIX 1 WINDOW KEYAPPENDIX 2 DAYLIGHT CALCULATIONSAPPENDIX 3 NO SKY LINE CONTOURS


1 EXECUTIVE SUMMARY

1.1 Overview

1.1.1 Right of Light Consulting has been commissioned by Pocket Living (2013) LLP to

undertake a daylight and sunlight study in connection with the development at 47

Gainsford Road, London E17 6QB. The aim of the study is to check whether or not

the proposed Flat G12 on the ground floor receive satisfactory levels of daylight and

sunlight.

1.1.2 The study is based on the numerical tests laid down in the Building Research

Establishment (BRE) guide ‘Site Layout Planning for Daylight and Sunlight: a good

practice guide’ by P J Littlefair 2011.

1.1.3 Appendix 1 identifies the windows analysed in this study. The numerical test results

(including all calculation workings) are provided in Appendix 2. No sky line contours

are presented in Appendix 3.

1.1.4 Right of Light Consulting confirms that the proposed design satisfies all of the

requirements set out in the BRE guide ‘Site Layout Planning for Daylight and

Sunlight’.


2 INFORMATION SOURCES

2.1 Documents Considered

2.1.1 This report is based on the following drawings:

GORT SCOTT Architects

10-10 Proposed Ground Floor Rev C20-10 Proposed South and West Elevations Rev A20-11 Proposed North and East Elevations Rev A30-10 Proposed Section Rev B30-11 Proposed Section Rev B


3 METHODOLOGY OF THE STUDY

3.1 BRE Guide : Site Layout Planning for Daylight and Sunlight

3.1.1 The study is based on the numerical tests laid down in the Building Research

Establishment (BRE) guide ‘Site Layout Planning for Daylight and Sunlight: a good

practice guide’ by P J Littlefair 2011.

3.1.2 The standards set out in the BRE guide are intended to be used flexibly. In instances

where there is a special requirement for daylight or sunlight, higher levels may be

deemed necessary. In other situations, such as with urban developments, lower

daylight and sunlight levels may be unavoidable. The following statement is quoted

directly from the BRE guide:

3.1.3 “The guide is intended for building designers and their clients, consultants and

planning officials. The advice given is not mandatory and this document should not

be considered as an instrument of planning policy. Its aim is to help rather than

constrain the designer. Although it gives numerical guidelines, these should be

interpreted flexibly because natural lighting is only one of the many factors in site

layout design.”

3.2 Interior Daylighting

3.2.1 The interior daylighting recommendations set out in BRE guide are based on British

Standard BS 8206 Part 2 and the Chartered Institute of Building Services Engineers

Applications Manual on window design. Collectively, the guides set out three main

criteria for interior daylighting. These are summarised as follows:

3.2.2 Test 1 Average Daylight Factor (df)

The Average Daylight Factor can be calculated using the following formula:

df = T Aw θ . %A (1-R2)

Where

T is the diffuse visible transmittance of the glazing (BRE standard of 0.68)Aw is the net glazed area of the window (m2)A is the total area of the room surfaces (m2)R is their average reflectanceΘ is the angle of visible sky in degrees


The Average Daylight factor test is applied to habitable rooms within domestic

properties. A kitchen is generally deemed to be a habitable room if it is large enough

to accommodate a dining area. If the kitchen is small or if the property has a

separate dining area then the accepted practice is to treat the kitchen as a non

habitable room.

For the purpose of this study we have assumed BRE internal reflectance values

pertaining to medium wooden floors, light painted walls and white painted ceilings.

The guide recommends an Average Daylight Factor of 5% or more if there is no

supplementary electric lighting, or 2% or more if supplementary lighting is provided.

There are additional minimum recommendations for dwellings of 2% for kitchens,

1.5% for living rooms and 1% for bedrooms.

A special procedure is required for floor to ceiling windows such as patio doors. If

part of a window is below the height of the working plane (a horizontal plane 0.85m

above the floor in housing), this portion should be treated as a separate window. The

ADF for this window has an extra factor applied to it, to take account of the reduced

effectiveness of low level glazing in lighting the room. A value equal to the floor

reflectance may be taken for this factor. The ADF for the portion of the window above

the working plane is calculated in the normal way without this additional factor, and

the ADFs for the two portions are added together.

3.2.3 Test 2 Room Depth

If a daylit room is lit by windows in one wall only, the depth of the room L should not

exceed the limiting value given by:

L + L ≤ . 2 .W H 1-Rb

Where

W is the room widthH is the window-head height above floor levelRb is the average reflectance of the surfaces in the rear half of the room


3.2.4 Test 3 Position of the no sky line

If a significant area of the working plane lies beyond the no sky line (i.e. it receives no

direct skylight), then the distribution of daylight in the room will look poor and

supplementary electric lighting will be required.

The no sky line assessment is not applicable where a room derives its daylight solely

from a light well or atrium. In these situations the room relies on borrowed light

instead of direct skylight.


3.3.1 The BRE guide recommends that where possible each dwelling should have at least

one main living room window that faces within 90 degrees of due south. However,

the guide acknowledges that this is not always possible when it comes to flats.

3.3.2 The BRE sunlight tests should be applied to all main living rooms and conservatories

which have a window which faces within 90 degrees of due south. The guide states

that sunlight is viewed as less important in kitchens and bedrooms. In non-domestic

buildings, any spaces which are deemed to have a specific requirement for sunlight

should be checked.

3.3.3 The BRE guide recommends that main living room windows should receive 25% of

the total annual probable sunlight hours, including 5% of the annual probable sunlight

hours during the winter months between 21st September and 21st March.


3.4.1 The availability of sunlight should be checked for all open spaces where sunlight is

required. This would normally include:

Gardens, usually the main back garden of a house Parks and playing fields Children’s playgrounds Outdoor swimming pools and paddling pools Sitting out areas, such as those between non-domestic buildings and in public

squares Focal points for views such as a group of monuments or fountains.


3.4.2 The BRE guide recommends that for an open space to appear adequately lit

throughout the year, at least 50% of its area should receive two hours of sunlight on

21st March


4 RESULTS OF THE STUDY

4.1 Window Reference Points

4.1.1 Refer to Appendix 1 for a drawing which identifies the positions of the windows

analysed in this study. We have tested the windows to flat G12 on the basis that, due

to its orientation and position within the scheme, it is likely to be the unit that receives

the least sunlight and daylight and if this satisfies the BRE requirements, the windows

to the other flats are likely to surpass the BRE minimum requirements by an even

greater margin.

4.2 Numerical Results and No Sky Line Contours

4.2.1 The numerical test results including all calculation workings are provided in Appendix

2. No sky line contours for the habitable rooms are presented in Appendix 3.

4.3 Interior Daylighting

4.3.1 All rooms meet or surpass the BRE Average Daylight Factor targets.

4.3.2 All rooms pass the room depth test.

4.3.3 The BRE guide does not give fixed numerical pass/fail criteria for the No Sky Line test

when applied to new dwellings (guidance is given for when this test is applied to

existing neighbouring buildings). However, for completeness, we have illustrated the

no sky line contours in Appendix 3.


4.4.1 The living room windows do not face within 90 degrees of due south and will

therefore not receive ideal levels of direct sunlight. However, the BRE guide

acknowledges that it is not always possible for every dwelling to be well situated to

receive direct sunlight. The proposed development therefore satisfies the BRE direct

sunlight to windows requirements.

4.5 Conclusion

4.5.1 Right of Light Consulting confirms that the proposed design satisfies all of the

requirements set out in the BRE guide ‘Site Layout Planning for Daylight and

Sunlight’.


5 CLARIFICATIONS

5.1 General

5.1.1 The report provided is solely for the use of the client and no liability to anyone else is

accepted.

5.1.2 We have undertaken the survey following the guidelines of the RICS publication

“Surveying Safely”.

5.1.3 Where limited access is available, reasonable assumptions will have been made.

5.1.4 Right of Light Consulting have endeavoured to include in the report those matters,

which they have knowledge of or of which they have been made aware, that might

adversely affect the validity of the opinion given.

5.1.5 Right of Light Consulting will notify those instructing them immediately and confirm in

writing if for any reason the report requires any correction or qualification.

5.1.6 Right of Light Consulting confirm that they have used their best endeavours to ensure

that the facts stated in this report are correct and that the opinions expressed

represent a true and complete professional opinion.

5.2 Project Specific

5.2.1 None.


APPENDICES


APPENDIX 1

WINDOW KEY

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APPENDIX 2

DAYLIGHT CALCULATIONS

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APPENDIX 3

NO SKY LINE CONTOURS

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