Harbour Primary & Nursery School, Church Hill, Newhaven ... · PDF fileDAYLIGHT AND SUNLIGHT...

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Daylight and Sunlight Study (Neighbouring Properties) Harbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX 24 th May 2013

Transcript of Harbour Primary & Nursery School, Church Hill, Newhaven ... · PDF fileDAYLIGHT AND SUNLIGHT...

Page 1: Harbour Primary & Nursery School, Church Hill, Newhaven ... · PDF fileDAYLIGHT AND SUNLIGHT STUDY Harbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX Page

Daylight and Sunlight Study (Neighbouring Properties)

Harbour Primary & Nursery School, Church Hill, Newhaven,East Sussex BN9 9LX

24th May 2013

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

Right of Light Consulting

Suite 6, Webster CourtWebster’s WayRayleighEssex SS6 8JQ

Tel: 0800 197 4836

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DAYLIGHT AND SUNLIGHT STUDY Page 1Harbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

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 ............................................................................................................8

5.1 General.....................................................................................................................85.2 Project Specific.........................................................................................................8

APPENDICES

APPENDIX 1 WINDOW & GARDEN KEYAPPENDIX 2 DAYLIGHT AND SUNLIGHT RESULTSAPPENDIX 3 OVERSHADOWING TO GARDENS AND OPEN SPACESAPPENDIX 4 PROPOSED SITE PLAN

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX Page 2

1 EXECUTIVE SUMMARY

1.1 Overview

1.1.1 Right of Light Consulting has been commissioned to undertake a daylight and

sunlight study of the proposed development at Harbour Primary & Nursery School,

Church Hill, Newhaven, East Sussex BN9 9LX.

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

receivable by the neighbouring residential properties at 4 Jubilee House and 25 to 37

The Rose Walk. 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 In summary, the proposed development will have a low impact on the light receivable

by its neighbouring properties. Right of Light Consulting confirms that the

development design satisfies all of the requirements set out in the BRE guide ‘Site

Layout Planning for Daylight and Sunlight’.

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX Page 3

2 INFORMATION SOURCES

2.1 Documents Considered

This report is based on drawings:

NPS SOUTH EAST LTD

02-07-14-1-1001-A-200 Site Plan Rev –02-07-14-1-1001-A-201 Existing Site Block Plan Rev –02-07-14-1-1001-A-210 Daylight and Sunlight Consideration Rev –02-07-14-1-1001-A-300 Existing Ground Floor Plan Rev –02-07-14-1-1001-A-301 Existing First Floor Plan Rev –02-07-14-1-1001-A-302 Existing Roof Plan Rev –02-07-14-1-1001-A-310 Proposed Lower Ground Floor Plan Rev –02-07-14-1-1001-A-311 Proposed Ground Floor Plan Rev –02-07-14-1-1001-A-312 Proposed First Floor Plan Rev –02-07-14-1-1001-A-313 Proposed Roof Plan Rev –02-07-14-1-1001-A-400 Site Elevations Rev –02-07-14-1-1001-A-401 Proposed Building Elevations Rev –02-07-14-1-1001-A-500 Existing and Proposed Site Sections Rev –

MK SURVEYS

18013 Topographical and Utility Survey Rev –

ENVIROCHECK SCALS

43760373_1_1 Historical Map-Segment A13 Rev –

The site plan illustrating the new proposed school buildings is contained inAppendix 4.

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX Page 4

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.

3.2.2 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.

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

3.2.4 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.

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3.2.5 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 can

and cannot 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% ofannual 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% ofannual 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.

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX Page 6

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 21st 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 sun on 21st March is less than 0.8 times

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

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX Page 7

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 windows pass the Vertical Sky Component test – before after/ratios of 0.88 and

above (against the BRE target of 0.8). The proposed development therefore satisfies

the BRE daylight requirements.

4.4 Sunlight to Windows

4.4.1 All windows face within 90 degrees of due south and accordingly they have been

tested for direct sunlight. All windows pass both the total annual sunlight hours test

and the winter sunlight hours test. The proposed development therefore satisfies the

BRE direct sunlight to windows requirements.

4.5 Overshadowing to Gardens and Open Spaces

4.5.1 The results of the overshadowing test show that sunlight availability to each of the

gardens after the development will be no less than 0.9 times the former value. This is

better than the BRE minimum requirement which permits sunlight to be reduced by

up to 0.8 times. The proposed development therefore passes the BRE

overshadowing to gardens and open spaces test.

4.6 Conclusion

4.6.1 The proposed development will have a very low impact on the light receivable by its

neighbouring properties. Right of Light Consulting confirms that the development

design satisfies all of the requirements set out in the BRE guide ‘Site Layout Planning

for Daylight and Sunlight’.

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX Page 8

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

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

APPENDICES

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

APPENDIX 1

WINDOW & GARDEN KEY

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Neighbouring Windows

4 Jubilee House

4 Jubilee House

2 1

Garden 1

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25 The Rose Walk

27 & 29 The Rose Walk

3

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31 The Rose Walk

31 The Rose Walk

Roof Light

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33 The Rose Walk

35 & 37 Rose Walk Close

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

APPENDIX 2

DAYLIGHT AND SUNLIGHT RESULTS

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Reference Use Class

Before After Loss Ratio

4 Jubilee House

Window 1 Habitable 32.1% 30.6% 1.5% 0.95

Window 2 Habitable 33.9% 32.3% 1.6% 0.95

25 The Rose Walk

Window 3 Habitable 21.4% 21.0% 0.4% 0.98

Window 3a Habitable 25.0% 24.5% 0.5% 0.98

Window 4 Habitable 23.3% 23.2% 0.1% 1.0

Window 5 Habitable 26.9% 26.6% 0.3% 0.99

Window 6 Habitable 31.4% 31.3% 0.1% 1.0

27 & 29 The Rose Walk

Window 7 Habitable 26.9% 26.4% 0.5% 0.98

Window 8 Habitable 31.5% 31.3% 0.2% 0.99

Window 9 Habitable 31.5% 31.4% 0.1% 1.0

Window 10 Habitable 37.7% 37.0% 0.7% 0.98

Window 11 Habitable 38.1% 37.7% 0.4% 0.99

Window 12 Habitable 36.5% 35.2% 1.3% 0.96

Window 13 Habitable 37.6% 36.8% 0.8% 0.98

Window 14 Habitable 38.0% 37.7% 0.3% 0.99

Window 15 Habitable 13.3% 12.3% 1.0% 0.92

Window 16 Habitable 24.2% 23.4% 0.8% 0.97

Window 17 Habitable 30.3% 30.1% 0.2% 0.99

31 The Rose Walk

Window 18 Habitable 84.4% 84.4% 0.0% 1.0

Window 19 Habitable 84.1% 84.1% 0.0% 1.0

Window 20 Habitable 23.9% 23.1% 0.8% 0.97

Window 21 Habitable 30.0% 29.8% 0.2% 0.99

Window 22 Habitable 18.0% 18.0% 0.0% 1.0

Window 23 Habitable 37.1% 36.1% 1.0% 0.97

Window 24 Habitable 38.1% 37.8% 0.3% 0.99

Appendix 2 - Vertical Sky Component

Harbour Primary & Nursery School, Church Hill, Newhaven

Vertical Sky Component

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Reference Use Class

Before After Loss Ratio

Appendix 2 - Vertical Sky Component

Harbour Primary & Nursery School, Church Hill, Newhaven

Vertical Sky Component

33 The Rose Walk

Window 25 Habitable 37.0% 35.9% 1.1% 0.97

Window 26 Habitable 38.1% 37.7% 0.4% 0.99

Window 27 Habitable 10.6% 9.3% 1.3% 0.88

Window 28 Habitable 25.0% 24.2% 0.8% 0.97

Window 29 Habitable 26.0% 25.9% 0.1% 1.0

Window 30 Habitable 25.6% 24.9% 0.7% 0.97

Window 31 Habitable 29.3% 29.0% 0.3% 0.99

35 & 37 Rose Walk Close

Window 32 Habitable 36.1% 35.0% 1.1% 0.97

Window 33 Habitable 35.9% 35.4% 0.5% 0.99

Window 34 Habitable 36.0% 35.0% 1.0% 0.97

Window 35 Habitable 36.1% 35.6% 0.5% 0.99

Window 36 Habitable 36.3% 35.4% 0.9% 0.98

Window 37 Habitable 36.1% 35.7% 0.4% 0.99

Window 38 Habitable 36.3% 35.6% 0.7% 0.98

Window 39 Habitable 35.7% 35.3% 0.4% 0.99

Window 40 Habitable 35.6% 35.3% 0.3% 0.99

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Reference Use Class

Before After Loss Ratio Before After Loss Ratio

4 Jubilee House

Window 1 Habitable 65% 64% 1% 0.98 25% 24% 1% 0.96

Window 2 Habitable 66% 65% 1% 0.98 23% 22% 1% 0.96

25 The Rose Walk

Window 3 Habitable 44% 44% 0% 1.0 14% 14% 0% 1.0

Window 3a Habitable 52% 52% 0% 1.0 16% 16% 0% 1.0

Window 4 Habitable 42% 41% 1% 0.98 10% 9% 1% 0.9

Window 5 Habitable 44% 44% 0% 1.0 10% 10% 0% 1.0

Window 6 Habitable 40% 39% 1% 0.98 11% 10% 1% 0.91

27 & 29 The Rose Walk

Window 7 Habitable 26% 26% 0% 1.0 4% 4% 0% 1.0

Window 8 Habitable 40% 40% 0% 1.0 5% 5% 0% 1.0

Window 9 Habitable 47% 46% 1% 0.98 8% 7% 1% 0.88

Window 10 Habitable 60% 59% 1% 0.98 20% 19% 1% 0.95

Window 11 Habitable 59% 59% 0% 1.0 20% 20% 0% 1.0

Window 12 Habitable 59% 57% 2% 0.97 20% 18% 2% 0.9

Window 13 Habitable 60% 59% 1% 0.98 20% 19% 1% 0.95

Window 14 Habitable 59% 59% 0% 1.0 20% 20% 0% 1.0

Window 15 Habitable 25% 24% 1% 0.96 8% 7% 1% 0.88

Window 16 Habitable 45% 44% 1% 0.98 11% 10% 1% 0.91

Window 17 Habitable 47% 47% 0% 1.0 16% 16% 0% 1.0

31 The Rose Walk

Window 18 Habitable 84% 84% 0% 1.0 26% 26% 0% 1.0

Window 19 Habitable 84% 84% 0% 1.0 26% 26% 0% 1.0

Window 20 Habitable 23% 23% 0% 1.0 2% 2% 0% 1.0

Window 21 Habitable 40% 40% 0% 1.0 4% 4% 0% 1.0

Window 22 Habitable 13% 13% 0% 1.0 0% 0% 0% 1.0

Window 23 Habitable 59% 59% 0% 1.0 19% 19% 0% 1.0

Window 24 Habitable 60% 60% 0% 1.0 20% 20% 0% 1.0

Appendix 2 - Sunlight to Windows

Harbour Primary & Nursery School, Church Hill, Newhaven, East Sussex

Sunlight to Windows

Total Sunlight Hours Winter Sunlight Hours

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Reference Use Class

Before After Loss Ratio Before After Loss Ratio

Appendix 2 - Sunlight to Windows

Harbour Primary & Nursery School, Church Hill, Newhaven, East Sussex

Sunlight to Windows

Total Sunlight Hours Winter Sunlight Hours

33 The Rose Walk

Window 25 Habitable 59% 59% 0% 1.0 19% 19% 0% 1.0

Window 26 Habitable 59% 59% 0% 1.0 19% 19% 0% 1.0

Window 27 Habitable 27% 26% 1% 0.96 19% 18% 1% 0.95

Window 28 Habitable 54% 54% 0% 1.0 19% 19% 0% 1.0

Window 29 Habitable 55% 55% 0% 1.0 21% 21% 0% 1.0

Window 30 Habitable 55% 55% 0% 1.0 19% 19% 0% 1.0

Window 31 Habitable 54% 54% 0% 1.0 19% 19% 0% 1.0

35 & 37 Rose Walk Close

Window 32 Habitable 67% 67% 0% 1.0 22% 22% 0% 1.0

Window 33 Habitable 65% 65% 0% 1.0 22% 22% 0% 1.0

Window 34 Habitable 67% 67% 0% 1.0 22% 22% 0% 1.0

Window 35 Habitable 66% 66% 0% 1.0 22% 22% 0% 1.0

Window 36 Habitable 67% 67% 0% 1.0 22% 22% 0% 1.0

Window 37 Habitable 65% 65% 0% 1.0 22% 22% 0% 1.0

Window 38 Habitable 67% 67% 0% 1.0 22% 22% 0% 1.0

Window 39 Habitable 64% 64% 0% 1.0 22% 22% 0% 1.0

Window 40 Habitable 63% 63% 0% 1.0 22% 22% 0% 1.0

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Reference

Ratio

4 Jubilee House

Garden 1 187.52 m2 177.55 m2 95% 177.55 m2 95% 0.0 m2 0% 1.0

25 The Rose Walk

Garden 2 268.8 m2 191.33 m2 71% 191.33 m2 71% 0.0 m2 0% 1.0

27 & 29 The Rose Walk

Garden 3 305.46 m2 259.56 m2 85% 259.56 m2 85% 0.0 m2 0% 1.0

Garden 4 170.41 m2 144.52 m2 85% 136.65 m2 80% 7.88 m2 5% 0.94

31 The Rose Walk

Garden 5 137.04 m2 111.61 m2 81% 100.09 m2 73% 11.51 m2 8% 0.9

33 The Rose Walk

Garden 6 163.29 m2 139.19 m2 85% 131.76 m2 81% 7.44 m2 4% 0.95

35 & 37 Rose Walk Close

Garden 7 161.35 m2 136.27 m2 84% 135.68 m2 84% 0.59 m2 0% 1.0

Garden 8 114.03 m2 97.22 m2 85% 96.16 m2 84% 1.06 m2 1% 0.99

Appendix 2 - Overshadowing to Gardens and Open Spaces

Harbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

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

Before After Loss

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

APPENDIX 3

OVERSHADOWING TO GARDENS AND OPEN SPACES

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DAYLIGHT AND SUNLIGHT STUDYHarbour Primary & Nursery School, Church Hill, Newhaven, East Sussex BN9 9LX

APPENDIX 4

PROPOSED SITE PLAN

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