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DAYLIGHT, SUNLIGHT & OVERSHADOWING ASSESSMENT
HEATHCOTE SECONDARY SCHOOL AND SCIENCE COLLEGE
96 NORMANTON PARK, CHINGFORD, LONDON, E4 6ES
ISSUE REVISION 5 DATE: 16TH OCTOBER 2016
ARTIST HOUSE, 1ST FLOOR, 35 LITTLE RUSSELL ST, LONDON WC1A 2HH
T: 0203 858 0115 E: [email protected]
www.ecostudioxv.com ECO studio Ltd - Registered in England No. 07610136 VAT Number 194867546
Reg. Office 98 Hornchurch Road, Hornchurch, Essex, RM11 1JS
ECOstudio XV LTD is registered with BRE Global no BREC400198, QUIDOS: QUID20110 AND ELMHURST EES/015107
QUALITY CONTROL- First Issue
Created by: Reviewed by: Authorized by:
Stephanie Millan Xavier Valladares Aparna Maladkar
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 2 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
ECOSTUDIO XV LTD, ARTIST HOUSE, 1ST FLOOR, 35 LITTLE RUSSELL ST, LONDON, WC1A 2HH T: 0203 858 0115
COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
CLIENT: HEATHCOTE SECONDARY SCHOOL
ARCHITECT: NPS Group
PROJECT TITLE:
Heathcote Secondary School and Science College, 96 Normanton
Park, Chingford, London, E4 6ES
REPORT: Daylight Sunlight & Overshadowing Assessment
AUTHOR: Stephanie Millan
REVIEWER: Xavier Valladares
AUTHORIZED: Aparna Maladkar
TYPE: For comment
FIRST ISSUE DATED: 14TH December 2016
REVISIONS: Date: REASON
REVISION 1- DRAFT 12TH OCTOBER 2016 MORE DETAILED ADDED TO MASSING AT
12NO BRITISH LEGION ROAD.
REVISOIN 2- DRAFT 12TH OCTOBER 2016 UPDATED SITE PLAN FOR 12NO BRITISH
LEGION ROAD.
REVISION 3- DRAFT 13TH OCTOBER 2016 MODEL AND ANALYSIS UPDATED BASED
ON TOPOGRAPHICAL SURVEY.
REVISION 4- DRAFT 13TH OCTOBER 2016 SECTION X-X’ ADDED
REVISION 5 16TH OCTOBER 2016 UPDATED BASED ON DETAILED
TOPOGRAPHICAL SURVEY
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 3 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
ECOSTUDIO XV LTD, ARTIST HOUSE, 1ST FLOOR, 35 LITTLE RUSSELL ST, LONDON, WC1A 2HH T: 0203 858 0115
COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
INDEX
1.0 EXECUTIVE SUMMARY .......................................................................................................................... 4
2.0 INTRODUCTION ..................................................................................................................................... 6
3.0 THE NATURE AND EFFECT OF DAYLIGHT AND SUNLIGHT ............................................................... 7
4.0 ASSESSMENT OF THE EFFECT ON DAYLIGHT – SUNLIGHT ............................................................... 8
5.0 ASSESSMENT CRITERIA ON DAYLIGHT – GENERAL .......................................................................... 9
6.0 ASSESSMENT CRITERIA ON SUNLIGHT AND OVERSHADOWING.................................................12
7.0 DATA .....................................................................................................................................................13
8.0 ANGLE TO SKY FROM HORIZONTAL ................................................................................................14
9.0 DAYLIGHT SUNLIGHT & OVERSHADOWING ASSESSMENT RESULTS ...............................................19
12. CONCLUSION ..........................................................................................................................................26
FIGURE 01 – MASSING OF THE ADJOINING HOUSES “AS EXISTING” IN LIGHT GREY AND
BUILDING “AS PROPOSED” IN ORANGE- PERSPECTIVE VIEW.
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 4 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
ECOSTUDIO XV LTD, ARTIST HOUSE, 1ST FLOOR, 35 LITTLE RUSSELL ST, LONDON, WC1A 2HH T: 0203 858 0115
COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
1.0 EXECUTIVE SUMMARY
DAYLIGHT, SUNLIGHT AND OVERSHADOWING TO NEIGHBOURS
The assessment undertaken in this report demonstrates that properties at 9, 10, 11 & 12 British Legion Road, would
not notice a reduction in their current Daylight and Sunlight levels if the proposed development at Heathcote
Secondary School goes ahead as currently proposed. This revision includes, a more detailed model has been
done for the property at 12 British Legion Road.
The angle to sky from horizontal has been calculated between the proposed development and the adjoining
properties at 9, 10, 11 and 12 British Legion Road. This can be seen in figures 12 to 15 below.
The analysis demonstrates that the proposed development subtends an angle well below the 25° rule. Therefore,
the proposed development will not impact the current daylight conditions, as it subtends an angle of between 7°
to 21° to the horizontal, under the worst case conditions.
An additional section X-X’ has been drawn perpendicular to the closest window at 12no British Legion Road
towards the school. This section shows an angle of only 13° to horizontal. Therefore, the proposed development
complies well within the BRE guidelines for daylight access.
The Annual Probable Sunlight Hours (APSH) and Winter Probable Sunlight Hours (WPSH) analysis has been carried
to the south facing façade and 1no worst case window at 12 British Legion Road. The sunlight conditions, even
with the proposed building, would receive more than the minimum 392 Annual Probable Sunlight Hours (APSH)
and 72 Winter Probable Sunlight Hours (WPSH).
The difference between the existing and proposed conditions is well below the maximum 20% allowed by the BRE
Guidelines for both the façade and the worst case window. The APSH for the façade has a 5.58% change (from
2,832 hrs. to 2,674 hrs.). The façade has 11.31% difference in WPSH (from 1,256 hrs. to 1,114 hrs.).
The worst case window has 7% change in APSH (from 3,026 hrs to 2,804 hrs.) and a 15% change in WPSH (from
1,319hrs to 1,116hrs). Therefore, the scheme complies well with the BRE Guidelines for Sunlight access to neighbours.
See Tables 3no and 4no for further details.
For a garden or an open space to appear adequately sunlit throughout the year, the BRE Guidelines recommend
that at least half of a garden or amenity area should receive at least 2 hours of sunlight on 21st March. In terms of
Sunlight and Overshadowing.
Results show that more than half of the garden at 12 British Legion Road, under the proposed conditions, receives
2no hours of sunlight. The existing conditions have an average value of 5.90 probable sunlight hours (PSH) and 5.30
PSH with the proposed scheme. The change is only 10.16% which is within accepted parameters. Therefore, the
scheme complies with the BRE Guidelines in terms of Sunlight and Overshadowing for gardens and open spaces.
Therefore, the scheme complies with the BRE Guidelines in terms of Daylight, Sunlight, and Overshadowing for
gardens and open spaces.
FIGURE 02 – MASSING OF THE ADJOINING HOUSES IN GREY WITH THE PROPOSED
DEVELOPMENT IN ORANGE.
FIGURE 03 – MASSING OF THE SITE AS EXISTING WITH THE ADJOINING BUILDINGS
IN GREY.
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 5 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
ECOSTUDIO XV LTD, ARTIST HOUSE, 1ST FLOOR, 35 LITTLE RUSSELL ST, LONDON, WC1A 2HH T: 0203 858 0115
COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
FIGURE 04 – SITE PLAN AS PROPOSED SHOWN IN SOLID GREY HATCH
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 6 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
ECOSTUDIO XV LTD, ARTIST HOUSE, 1ST FLOOR, 35 LITTLE RUSSELL ST, LONDON, WC1A 2HH T: 0203 858 0115
COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
2.0 INTRODUCTION
The Building Research Establishment (BRE) has set out in their handbook Site Layout Planning for Daylight and
Sunlight a Guide to Good Practice (2011), guidelines and methodology for the measurement and assessment of
daylight and sunlight within proposed buildings. This document states that it is also intended to be used in
conjunction with the interior daylight recommendations found within the British Standard BS8206-2:2008 and the
Applications Manual on Window Design of the Chartered Institution of Buildings Services Engineers (CIBSE).
The guide also provides advice on site layout planning to determine the quality of daylight and sunlight within
open spaces between buildings.
ECOstudio XV has been commissioned to undertake the following studies of the adjoining property 12 British Legion
Road in relation to the proposed development at Heathcote Secondary School:
o Create a 3D computer model of the proposal based upon drawings prepared by the design team.
o Carry out the following assessments:
o Daylight, sunlight and overshadowing assessment to neighbours using the methodologies set out in
the BRE guidelines for Angle to Sky from Horizontal, PSH, APSH & WPSH. These were based on design
proposals developed by the design team.
o Prepare a report setting out the analysis and our findings.
FIGURE 05 – PROBABLE SUNLIGHT HOURS OF THE DEVELOPMENT “AS PROPOSED”
TOWARDS THE GARDEN AT 12no. BRITISH LEGION ROAD.
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
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COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
3.0 THE NATURE AND EFFECT OF DAYLIGHT AND SUNLIGHT
The provision of daylight is as important as ensuring low levels of noise, or low levels of odour, in maintaining the
enjoyment of one’s property. Adequate levels of daylight are important not only to light and heat the home, but
also for an occupant’s emotional well-being. Daylight is widely accepted to have a positive psychological effect
on human beings and there is a great deal of evidence to suggest that people who are deprived of daylight are
more susceptible to depression and mood swings. This is common in northern countries, such as Norway, Iceland
and Canada where daylight is scarce during the winter months.
When assessing the effects of proposed building projects on the potential to cause issues relating to light, it is
important to recognize the distinction between daylight and sunlight. Daylight is the combination of all direct and
indirect sunlight during the daytime, whereas sunlight comprises only the direct elements of sunlight. On a cloudy
or overcast day diffused daylight still shines through windows, even when sunlight is absent.
Care should also be taken when the development is situated to the south of existing buildings, as in the northern
hemisphere the majority of the sunlight comes from the south. In the UK (and other northern hemisphere countries)
south- facing facades will, in general, receive most sunlight, while north facing facades will receive sunlight few
hours during summer months, specifically early mornings and late evenings.
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 8 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
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COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
4.0 ASSESSMENT OF THE EFFECT ON DAYLIGHT – SUNLIGHT The Department for Communities and Local Government (DCLG) sets national planning policy. Their document
“The Planning System: General Principles (2005)”, published in conjunction with Planning Policy Statement 1:
Delivering Sustainable Development, discusses the need to protect amenities in the effects of overshadowing, and
does not have target, criteria or relevant planning guidance, in the way it has for other environmental impacts
such as noise, landscape or air quality.
Reference is made to the Building Research Establishment (BRE) report, “Site Layout Planning for daylight and
sunlight- a guide to good practice” by P J Littlefair, 2011.
FIGURE 06 – ANNUAL SUN PATH WITH MASSING OF THE DEVELOPMENT “AS
PROPOSED” - PERSPECTIVE VIEW
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
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COMPANY REGISTERED IN ENGLAND NUMBER 7610136 VAT NUMBER 194 867 546
5.0 ASSESSMENT CRITERIA ON DAYLIGHT – GENERAL
When assessing the effects of proposed building projects on the potential to cause issues relating to light, it is
important to recognize the distinction between daylight and sunlight. Daylight is the combination of all direct and
indirect sunlight during the daytime, whereas sunlight comprises only the direct elements of sunlight. On a cloudy
or overcast day diffused daylight still shines through windows, even when sunlight is absent.
Care should also be taken when the development is situated to the south of existing buildings, as in the northern
hemisphere the majority of the sunlight comes from the south. In the UK (and other northern hemisphere countries)
south- facing facades will, in general, receive most sunlight, while north facing facades will receive sunlight few
hours during summer months, specifically early mornings and late evenings.
5.1 ASSESSMENT CRITERIA ON DAYLIGHT – IMPACT TO NEIGHBOURS
Reference is made to the Building Research Establishment (BRE) report, “Site Layout planning for daylight and
sunlight- a guide to good practice” by P J Little fair.
The BRE document looks at three separate areas when considering the impacts of a new development on an
existing property:
1. – Daylight - The impacts of all direct and indirect sunlight during daytime.
2. – Sunlight - The impacts of only the direct sunlight; and overshadowing of garden and open spaces.
3. – Overshadowing of Gardens and Open spaces
The BRE report provides guidelines for when the obstruction to sunlight may become an issue:
- If the proposed or existing development has a window that faces within 90° of due south, and
- On this window wall, all points on a line 2m above ground level are within 4m (measured sideways) of a point
which receives at least a quarter of annual probable sunlight hours, including at least 5% of annual probable
sunlight hours during the winter months, between 21st September and 21st March.
Table 03 summarises the criteria used to assess the impacts from new development on the daylight reaching
existing properties.
5.2 ANGLE TO SKY FROM HORIZONTAL- IMPACT TO NEIGHBOURS
In general, a building will retain the potential for good interior diffuse day lighting provided that on all its main
faces:
a) No obstruction, measured in a vertical section perpendicular to the main face, from a point 2m above
ground or first level, subtends an angle of 25 ° to the horizontal or less. See Figure 06 for further details. OR If (a) is not satisfied, then all points on the main face on a line 2m above ground or first level are within 4m
(measured sideways) of a point which has a vertical sky component of 27% or less.
TABLE 01 – SUMMARY CRITERIA FROM BRE REPORT TO ASSESS THE IMPACT OF THE
PROPOSED DEVELOPMENT
PARAMETER
BRE REPORT
REFERENCE
CRITERIA
ACCEPTABILITY
CRITERIA
Daylight
Section 2.2
Any part of the new
building measured in a
vertical section
perpendicular to a main
window wall subtends an
angle of less than 25° to
the horizontal
Any part of the new
building measured in a
vertical section
perpendicular to a main
window wall subtends an
angle of less than 25° to the
horizontal.
Vertical Sky Component
(VSC)
Reduction from existing not
more than 20% its former
value if VSC is lower than
27%.
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b) If (a) is not satisfied, then all points on the main face on a line 2m above ground or first level are within 4m
(measured sideways) of a point which has a vertical sky component of 27% or less.
5.3 VERTICAL SKY COMPONENT (VSC) CRITERIA
When the angle to sky from horizontal criteria is not met, of there is a complex geometry in the surrounding buildings
a more detailed assessment needs to be carried out. This detailed assessment is called Vertical Sky Component
(VSC).
This analysis will quantify the amount of sky falling on the reference windows for a daylight calculation).
FIGURE 07 - SECTION SHOWING THE ANGLE TO SKY FROM HORIZONTAL CRITERIA FOR DIFFUSE
DAYLIGHTING
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When undertaking a daylight assessment, the BRE report recommends a VSC of 27% or more should be achieved
if a room is to be adequately day lit. It is also suggested that when existing levels of daylight are below 27% VSC,
a reduction of more than 20% from the existing level.
FIGURE 08 – STEREOGRAPHIC DIAGRAM FOR CALCULATING THE VSC
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DAYLIGHT SUNLIGHT ASSESSMENT PAGE 12 of 26
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6.0 ASSESSMENT CRITERIA ON SUNLIGHT AND OVERSHADOWING
6.1 SUNLIGHT – THE IMPACTS DIRECT SUNLIGHT
The methodologies and criteria to assess the impact of Direct Sunlight. Table 05 summarises the criteria used to
assess the impact from a new development on the sunlight reaching existing properties. Further details can be
found at Appendix 1 of the BRE Report,
6.2 ASSESSMENT CRITERIA ON SUNLIGHT AND OVERSHADOWING TO GARDENS, PARKS AND OPEN SPACES
According to Paul Littlefair’s “Site Layout Planning for Daylight and Sunlight” if a building is to be constructed
near an open space such as:
Gardens
Parks
Children Playgrounds
Outdoor swimming pools
Monuments or fountains.
A Sunlight analysis should be carried out in order to prove that, at least half of the garden or open space
receives 2 hours of sunlight on 21st March. In addition, the reduction between the exiting and proposed
conditions should not be more than 20% reduction or 0.8 times its former value.
FIGURE 09 – INSERT REFERENCE IMAGE SUNLIGHT TO GARDEN, OPEN SPACES
TABLE 02 – SUMMARY CRITERIA FROM BRE REPORT TO ASSESS THE IMPACT OF PROPOSED
DEVELOPMENTS
PARAMETER
BRE REPORT
REFERENCE
CRITERIA
ACCEPTABILITY
CRITERIA
Sunlight &
Overshadowing
Section 3.1
Annual Probable Sunlight
Hours. (APSH)
Winter Probable Sunlight
Hours. (WPSH)
Reduction from existing not
more than 20%
AND
Not less than 75 for WPSH
and 392 for APSH
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DAYLIGHT SUNLIGHT ASSESSMENT PAGE 13 of 26
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7.0 DATA All of the information has been taken directly from digital files provided by NPS. The height of the obstructions has
been taken from survey data and OS Maps.
Figure 11 shows the site plan as proposed with 4no sections taken to analyse the Angle to Sky from Horizontal.
FIGURE 11 – SITE LOCATION SHOWING THE PROPOSED SITE IN LIGHT ORANGE AND EXISTING HOUSES IN BROWN
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
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8.0 ANGLE TO SKY FROM HORIZONTAL The angle to sky from horizontal has been calculated between the proposed development and the adjoining
properties at 12, 11, 10 and 9no British Legion Road. This can be seen in figures 12 to 16 below.
The below figures demonstrates that the proposed development subtends an angle well below the 25° rule.
Therefore, the proposed development will not impact the current daylight conditions, as it subtends an angle of
between 7° to 21° to the horizontal on the worst case conditions.
An additional section X-X’ has been drawn perpendicular to the closest window at 12no British Legion Road
towards the school. This section shows an angle of only 13° to horizontal.
FIGURE 12 – SECTION A-A´ SHOWING ANGLE TO SKY FROM HORIZONTAL FOR 12 BRITISH LEGION ROAD- WORST CASE CONDITION FROM WINDOW TO SCHOOL.
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FIGURE 13 – SECTION B-B´ SHOWING ANGLE TO SKY FROM HORIZONTAL FOR 11 BRITISH LEGION ROAD.
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FIGURE 14 – SECTION C-C´ SHOWING ANGLE TO SKY FROM HORIZONTAL FOR 10 BRITISH LEGION ROAD.
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FIGURE 15 – SECTION D-D´ SHOWING ANGLE TO SKY FROM HORIZONTAL FOR 9 BRITISH LEGION ROAD.
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FIGURE 16 – SECTION X-X´ SHOWING ANGLE TO SKY FROM HORIZONTAL FOR 12 BRITISH LEGION ROAD.
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9.0 DAYLIGHT SUNLIGHT & OVERSHADOWING ASSESSMENT RESULTS
SUNLIGHT ASSESSMENT RESULTS
The proposed development orientation, located at 96 Normanton Park, London, E4 6ES can be seen on Figure 16.
According to the BRE Guidelines any window should be assessed against the WPSH and APSH if they face 90°
degrees due south. This in relation to the proposed development and the existing conditions.
The Annual Probable Sunlight Hours (APSH) and Winter Probable Sunlight Hours (WPSH) analysis has been carried
to the south facing façade and worst case window at 12 British Legion Road. The sunlight conditions, even with
the proposed building, would receive more than the minimum 392 Annual Probable Sunlight Hours (APSH) and 72
Winter Probable Sunlight Hours (WPSH).
The difference between the existing and proposed conditions is well below the maximum 20% allowed by the BRE
Guidelines for both the façade and the worst case window. The APSH for the façade has a 5.58% change (from
2,832 hrs. to 2,674 hrs.). The façade has 11.31% difference in WPSH (from 1,256 hrs. to 1,114 hrs.).
The worst case window has 7% change in APSH (from 3,026 hrs to 2,804 hrs.) and a 15% change in WPSH (from
1,319hrs to 1,116hrs). Therefore, the scheme complies well with the BRE Guidelines for Sunlight access to neighbours.
See Tables 3no and 4no for further details.
FIGURE 17 - SITE PLAN SHOWING THE SITE IN SOLID GREY “AS PROPOSED”
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9.1 GARDEN AND OPEN SPACES
According to Littlefair’s “Site Layout Planning for Daylight and Sunlight” if a building is to be constructed near an
open space such as:
Gardens.
Parks.
Children Playgrounds.
Outdoor swimming pools.
Monuments or fountains.
Daylight analysis should be carried out in order to prove that, at least, half of the garden or open space receives
2 hours of sunlight on 21st March. F
For a garden or an open space to appear adequately sunlit throughout the year, the BRE Guidelines recommend
that at least half of a garden or amenity area should receive at least 2 hours of sunlight on 21st March. In terms of
Sunlight and Overshadowing.
Results show that more than half of the garden at 12 British Legion Road, under the proposed conditions, receives
2no hours of sunlight. The existing conditions have an average value of 5.90 probable sunlight hours (PSH) and 5.30
PSH with the proposed scheme. The change is only 10.16% which is within accepted parameters.
Therefore, the scheme complies with the BRE Guidelines in terms of Sunlight and Overshadowing for gardens and
open spaces.
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TABLE 03 – APSH & WPSH 12no BRITISH LEGION ROAD
SITE ADDRESS
CONDITION
ANALYZED
MINIMUM
APSH AS PER
BRE
GUIDELINES
APSH
REDUCTION
PERCENTAGE
(MAXIMUM 20% IF
BELOW 392 APSH)
MINIMUM
WPSH AS PER
BRE
GUIDELINES
WPSH
REDUCTION
PERCENTAGE
(MAXIMUM 20% IF
BELOW 72 WPSH)
COMPLIES WITH
BRE GUIDELINES?
12NO BRITISH
LEGION ROAD
AS EXISTING
392 2,832
5.58 %
72 1,256
11.31 %
YES
AS PROPOSED
392 2,674 72 1,114 YES
FIGURE 18 – APSH– DEVELOPMENT “AS EXISTING” – 12 BRITISH LEGION RD 2,832 HRS
FIGURE 19 – APSH– DEVELOPMENT “AS PROPOSED” – 12 BRITISH LEGION RD 2,674 HRS
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FIGURE 20 – WPSH– DEVELOPMENT “AS EXISTING” –– 12 BRITISH LEGION RD 1.256 HRS
FIGURE 21 –WPSH– DEVELOPMENT “AS PROPOSED” – 12 BRITISH LEGION RD- 1,114HRS
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 23 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
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TABLE 04 – APSH & WPSH 12no BRITISH LEGION ROAD- WORST CASE WINDOW
SITE ADDRESS
CONDITION
ANALYSED
MINIMUM
APSH
AS PER BRE
GUIDELINES
APSH
REDUCTION
PERCENTAGE
(MAXIMUM 20% IF
BELOW 392 APSH)
MINIMUM
WPSH AS PER
BRE
GUIDELINES
WPSH
REDUCTION
PERCENTAGE
(MAXIMUM 20% IF
BELOW 72 WPSH)
COMPLIES WITH
BRE GUIDELINES?
12NO BRITISH
LEGION ROAD
WORST CASE
WINDOW
AS EXISTING
392 3,026
7.0%
72 1,319
15.0 %
YES
AS PROPOSED
392 2,804 72 1,116 YES
FIGURE 22 – APSH– DEVELOPMENT “AS EXISTING” – 12 BRITISH LEGION RD-WORST CASE
WINDOWS = 3,026 HRS
FIGURE 23 – APSH– DEVELOPMENT “AS PROPOSED” – 12 BRITISH LEGION RD =2,804
HRS
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 24 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
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FIGURE 24 – WPSH– DEVELOPMENT “AS EXISTING” –– 12 BRITISH LEGION RD 1,319 HRS
FIGURE 25 –WPSH– DEVELOPMENT “AS PROPOSED” – 12 BRITISH LEGION RD 1,116 HRS
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 25 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
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FIGURE 26 – PSH– DEVELOPMENT “AS EXISTING” – 21ST MARCH –AVERAGE 5.90 HRS
FIGURE 27 –PSH– DEVELOPMENT “AS PROPOSED” – 21ST MARCH- AVERAGE 5.30 HRS
HEATCOTE SECONDARY SCHOOL & SCIENCE COLLEGE
DAYLIGHT SUNLIGHT ASSESSMENT PAGE 26 of 26
REPORT REFFERENCE 462-161016 Heathcote Daylight - Sunlight Rep r5.docx
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10. CONCLUSION
DAYLIGHT SUNLIGHT AND OVERSHADOWING- TO NEIGHBOURS
The assessment undertaken in this report demonstrates that properties at 9, 10, 11 & 12 British Legion Road, would
not notice a reduction in their current Daylight and Sunlight levels if the proposed development at Heathcote
Secondary School goes ahead as currently proposed. This revision includes, a more detailed model has been
done for the property at 12 British Legion Road.
The angle to sky from horizontal has been calculated between the proposed development and the adjoining
properties at 9, 10, 11 and 12 British Legion Road. This can be seen in figures 12 to 15 above.
The analysis demonstrates that the proposed development subtends an angle well below the 25° rule. Therefore,
the proposed development will not impact the current daylight conditions, as it subtends an angle of between 7°
to 21° to the horizontal, under the worst case conditions.
An additional section X-X’ has been drawn perpendicular to the closest window at 12no British Legion Road
towards the school. This section shows an angle of only 13° to horizontal. Therefore, the proposed development
complies well within the BRE guidelines for daylight access.
The Annual Probable Sunlight Hours (APSH) and Winter Probable Sunlight Hours (WPSH) analysis has been carried
to the south facing façade and 1no worst case window at 12 British Legion Road. The sunlight conditions, even
with the proposed building, would receive more than the minimum 392 Annual Probable Sunlight Hours (APSH)
and 72 Winter Probable Sunlight Hours (WPSH).
The difference between the existing and proposed conditions is well below the maximum 20% allowed by the BRE
Guidelines for both the façade and the worst case window. The APSH for the façade has a 5.58% change (from
2,832 hrs. to 2,674 hrs.). The façade has 11.31% difference in WPSH (from 1,256 hrs. to 1,114 hrs.).
The worst case window has 7% change in APSH (from 3,026 hrs to 2,804 hrs.) and a 15% change in WPSH (from
1,319hrs to 1,116hrs). Therefore, the scheme complies well with the BRE Guidelines for Sunlight access to neighbours.
See Tables 3no and 4no for further details.
For a garden or an open space to appear adequately sunlit throughout the year, the BRE Guidelines recommend
that at least half of a garden or amenity area should receive at least 2 hours of sunlight on 21st March. In terms of
Sunlight and Overshadowing.
Results show that more than half of the garden at 12 British Legion Road, under the proposed conditions, receives
2no hours of sunlight. The existing conditions have an average value of 5.90 probable sunlight hours (PSH) and 5.30
PSH with the proposed scheme. The change is only 10.16% which is within accepted parameters. Therefore, the
scheme complies with the BRE Guidelines in terms of Sunlight and Overshadowing for gardens and open spaces.
Therefore, the scheme complies with the BRE Guidelines in terms of Daylight, Sunlight, and Overshadowing for
gardens and open spaces.
FIGURE 28 –BUILDING “AS PROPOSED” IN SOLID ORANGE AND CONTEXT IN LIGHT
GREY.