Pudding Lane Hyde Daylight and Sunlight Report …plandocs.tameside.gov.uk/anitepublicdocs/00178537.pdfPudding Lane Hyde Daylight and Sunlight Report February 2013 Page 2 1.0 Introduction

Paul Fletcher MSc Waterslade Ltd, registered in England no. 2782750, VAT No. 596422511 Martin Howarth MA DPhil (Oxon), Malcolm Macpherson MA DPhil (Oxon)

Pudding Lane Hyde

Daylight and Sunlight Report

February 2013

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1.0 Introduction We have been instructed to assess the daylight and sunlight amenity to the site at Pudding Lane, Hyde as requested by Tameside Council. The site is surrounded by trees and the council has expressed concerns regarding the level of impact that these will have on daylight and sunlight. It is usual to assess daylight and sunlight in relation to the guidelines set out in the 2011 Building Research Establishment (BRE) Report 'Site layout planning for daylight and sunlight - A guide to good practice' by Paul Littlefair. With regard to calculations, we note that the guidelines state that, ‘Normally trees and shrubs need not be included, partly because their shapes are almost impossible to predict, and partly because the dappled shade of a tree is more pleasant than the deep shadow of a building.’ The principal measures of daylight provided by the BRE for assessing the daylight amenity to a new development are Vertical Sky Component (VSC) and Average Daylight Factor (ADF). In terms of sunlight, we examine the BRE Annual Probable Sunlight Hours (APSH). These are discussed in the following paragraphs. We have also considered overshadowing to the site. Vertical Sky Component (VSC) - VSC is a measure of the skylight reaching a point from an overcast sky. The BRE guidelines suggest that if the VSC at a window is at least 27%, then conventional window design should allow for adequate daylighting within a room. Where the VSC is between 15% and 27%, then special measures such as larger windows will usually be needed. Where a VSC is under 15% it is difficult to provide adequate daylight unless very large windows are used. Average Daylight Factor (ADF) - ADF is a measure of the daylight within a room, and accounts for factors such as the number of windows and their size in relation to the size of the room. Clearly a small room with a large window will be better illuminated by daylight than a large room with a small window. It also accounts for window transmittance and the reflectance of the internal walls, floor and ceiling. The general idea is that the daylight which reaches each of the windows is first calculated. Then, allowing for the window size, the daylight which then enters the room through the windows is determined. The light is then imagined to bounce around within the room, controlled by the reflectance of the internal surfaces. The ADF is detailed in British Standard 8206 Part 2:2008. As for the BRE report, it provides guidance for acceptable values in the presence of supplementary electric lighting, depending on the room use. These are 1.0% for a bedroom, 1.5% for a living room and 2.0% for a kitchen. Annual Probable Sunlight Hours (APSH) - In relation to sunlight, the BRE suggests that if the centre of at least one window to a main living room can receive 25% of total APSH, including at least 5% in winter, then overall the dwelling is likely to appear reasonably sunlit. Overshadowing – With regard to overshadowing, the BRE guidelines recommend that for it to appear adequately sunlit throughout the year, at least half of a garden or amenity space should receive at least two hours of sunlight on 21 March. Driveways and hard standing for cars should be omitted from the analysis; only the main back garden should be considered.

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2.0 Sources of Information INITIATIVES DESIGN Site survey and proposal drawings – 572.1\UPPS\200\01-04 BOWLAND ECOLOGY Arboricultural Impact Assessment dated 14th November 2012 3.0 Drawings attached Drawing Number Title 804/01 - Site Plan, As Proposed 804/02 - 3D View, As Proposed 804/03 - 3D View, As Proposed 804/04 - Time in Sun, 21st June 804/05 - Time in Sun, 21st March 804/06 - BRE 2 Hour Sunlight Test 804/07 - Window Locations 4.0 Daylight and Sunlight Analysis Initially, a detailed 3-dimensional computer model of the existing site, proposed houses, and all the surrounding trees was created. This is shown in drawings 804/01-03. Each window to be analysed has been assigned a reference number, these are shown in drawing W804/07. The trees have been generated using a software package called Onyxtree. We have used the information contained within the Arboricultural Impact Assessment to position and size the trees. A number of trees along the eastern boundary of the site are to be removed. We have been advised that mitigation is to be agreed with the council, but it is likely that a combination of Scots Pine and Silver Birch will be used. For the purpose of the analysis we have assumed these trees to be between 12 and 15 metres tall. The model was analysed using proprietary software to calculate the various measures of daylight and sunlight. The resulting levels were then compared to the relevant BRE Report guidelines. 7.0 Results and Discussion 7.1 Daylight - With reference to the attached table of results, we have calculated the VSC values to all the windows serving main habitable rooms within the proposed houses. While the majority of trees surrounding the site are evergreens, there are a small number of deciduous trees. These will lose their leaves in winter and we present the summer, winter and average values. The majority of windows achieve VSC values in excess of 27%. One kitchen window (W1/10) falls marginally short, achieving an average value of 26.41%. We consider that this value is acceptable and provides the kitchen with the potential for good daylighting.

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The windows serving the ground floor dining rooms achieve lower VSC values. These windows are all located under large balconies serving the living rooms above. It is the presence of the balconies, rather than the proximity of the trees that gives rise to these lower values. The area of glazing to the dining rooms is large, and with reference to BS8206 Part 2:2008 we have calculated the ADF values for each of these rooms. In calculating the ADF we have assumed the following reflectances: floors 0.4 (light wood or cream carpet), ceilings 0.85 (white paint), internal walls 0.81 (pale cream paint). We have assumed the windows to be double glazed windows with a glazing transmittance of 0.7. We find that all the rooms achieve an ADF value in excess of the recommended 1.5%. Overall the proposal will therefore have good daylight amenity. 7.2 Sunlight – As recommended by the BRE guidelines, we have calculated the APSH to each main living room window in each dwelling. With reference to the attached table of results, all the living room windows in Houses 1-4 comply with the guidelines. The two windows serving the living room in House 5 (W2/51 & W3/51) both fall marginally short of achieving the guideline figures, but the overall level of sunlight to the room will be good – the windows combined will receive 30% of annual APSH. The main facades of each proposed house face either directly due east or directly due west. This lowers the expectation for good sunlight amenity, but allows all windows to potentially receive sufficient sunlight. This would not be the case for north-south facing houses as the north facing windows would suffer severely restricted sunlight access. Overall the level of sunlight amenity to the houses will be good. 7.3 Overshadowing – In order to understand the amount of sunlight potentially available over the whole of each garden we have created a 100mm square grid over the site. We have omitted the access road, parking spaces and the banked areas to the north and south of the site. We have calculated the duration of potential sunlight for each grid point for 21st March and 21st June. The results are shown in the attached drawings 804/04 & 05. These show that generally the site will receive good levels of sunlight. On June 21st approximately one third of the area tested will potentially receive over 8 hours of direct sunlight. Drawing 804/06 shows the results for the BRE 2 Hour Sunlight Test. It shows that comfortably more than 50% or the rear gardens to each of Houses 1 – 4 will potentially receive in excess of 2 hours direct sunlight on March 21st. Exactly 50% of the rear garden to House 5 will potentially receive in excess of 2 hours sunlight. The proposal is therefore in compliance with the guidelines. 8.0 Conclusions We have considered the daylight and sunlight amenity to the proposed houses and their gardens in detail. While the trees surrounding the site will obviously have a significant bearing on the levels of amenity, overall we find levels of both daylight and sunlight to be good and in accordance with the guidance provided by the BRE.

Project Title:

Drawing Title:

Drawing No.

Date:

Sources:

804/01 1:400Scale:

SITE PLAN

FEB 2013

PUDDING LANE

HYDE

INITIATIVES DESIGN

Site survey and proposal drawings -

572.1\UPPS\200\01-04

BOWLAND ECOLOGY

Arboricultural Impact Assessment dated 14th

November 2012

t: 01865 881882 f: 01865 881891 @: www.waterslade.com

5 Thames Street, Eynsham, Oxford, OX29 4HF

N

HOUSE 1

HOUSE 2

HOUSE 3

HOUSE 4

HOUSE 5

MO

TT

RA

M R

OA

D

P

U

D

D

I

N

G

L

A

N

E

Project Title:

Drawing Title:

Drawing No.

Date:

Sources:

804/02 N/SScale:

VIEW FROM SOUTH WEST

FEB 2013

PUDDING LANE

HYDE

INITIATIVES DESIGN


572.1\UPPS\200\01-04

BOWLAND ECOLOGY


November 2012



Project Title:

Drawing Title:

Drawing No.

Date:

Sources:

804/03 NTSScale:

VIEW FROM NORTH EAST

FEB 2013

PUDDING LANE

HYDE

INITIATIVES DESIGN


572.1\UPPS\200\01-04

BOWLAND ECOLOGY


November 2012



Project Title:

Drawing Title:

Drawing No.

Date:

Sources:

804/04 1:250Scale:

TIME IN SUN

JUNE 21ST

FEB 2013

PUDDING LANE

HYDE

INITIATIVES DESIGN


572.1\UPPS\200\01-04

BOWLAND ECOLOGY


November 2012



0-1hr

1-2hrs

2-3hrs

3-4hrs

4-5hrs

5-6hrs

6-7hrs

7-8hrs

Over 8hrs

KEY: TIME IN SUN

Project Title:

Drawing Title:

Drawing No.

Date:

Sources:

804/05 1:250Scale:

TIME IN SUN

MARCH 21ST

FEB 2013

PUDDING LANE

HYDE

INITIATIVES DESIGN


572.1\UPPS\200\01-04

BOWLAND ECOLOGY


November 2012



0-1hr

1-2hrs

2-3hrs

3-4hrs

4-5hrs

5-6hrs

6-7hrs

7-8hrs

Over 8hrs

KEY: TIME IN SUN

Project Title:

Drawing Title:

Drawing No.

Date:

Sources:

804/06 1:250Scale:

BRE 2HR SUNLIGHT TEST

MARCH 21ST

FEB 2013

PUDDING LANE

HYDE

INITIATIVES DESIGN


572.1\UPPS\200\01-04

BOWLAND ECOLOGY


November 2012



AREA RECEIVING MORE THAN 2

HOURS OF DIRECT SUNLIGHT

AREA RECEIVING LESS THAN 2

HOURS OF DIRECT SUNLIGHT

% OF AREA RECEIVING

MORE THAN 2 HOURS OF

DIRECT SUNLIGHT

Project Title:

Drawing Title:

Drawing No.

Date:

Sources:

804/07 NTSScale:

WINDOW LOCATIONS

FEB 2013

PUDDING LANE

HYDE

INITIATIVES DESIGN


572.1\UPPS\200\01-04

BOWLAND ECOLOGY


November 2012



HOUSES 1 & 2 - FRONT HOUSES 1 & 2- REAR

HOUSES 3, 4 & 5 - FRONT HOUSES 3, 4 & 5 - REAR

PUDDING LANEHYDE

DAYLIGHT AND SUNLIGHT ANALYSISINITIATIVES ARCHITECTS PROPOSAL

FEB 2013

VSC(%) ADF(%) APSH ‐ WINDOW APSH ‐ ROOMRoom Roomuse Window Summer Winter Average Summer Winter Average Summer Winter Annual Summer Winter Annual

HOUSE 1

R1/10 KITCHEN W1/10 26.36 26.46 26.41

R2/10 DINING W3/10 6.54 7.61 7.08 R2/10 DINING W4/10 9.34 11.07 10.21 R2/10 DINING W5/10 6.39 7.59 6.99 R2/10 DINING W6/10 5.51 6.67 6.09 1.96 2.11 2.04

R1/11 BEDROOM W1/11 28.97 29.04 29.01

R2/11 LIVINGROOM W2/11 30.18 32.14 31.16 27 11 38R2/11 LIVINGROOM W3/11 31.98 34.33 33.16 24 7 31 30 11 41

R1/12 STUDY W1/12 30.78 30.83 30.81

R2/12 BEDROOM W2/12 29.93 29.97 29.95

R3/12 BEDROOM W3/12 31.65 32.91 32.28

R4/12 BEDROOM W4/12 32.55 34.12 33.34

IPR090113.xls 08/02/2013 1

PUDDING LANEHYDE


FEB 2013


HOUSE 2

R1/20 KITCHEN W1/20 28.25 29.04 28.65


R1/21 BEDROOM W1/21 30.90 31.25 31.08

R2/21 LIVINGROOM W2/21 31.64 35.64 33.64 22 11 33 R2/21 LIVINGROOM W3/21 32.71 35.69 34.20 23 7 30 26 11 37

R1/22 STUDY W1/22 31.30 31.34 31.32

R2/22 BEDROOM W2/22 31.63 31.67 31.65

R3/22 BEDROOM W3/22 32.10 35.34 33.72

R4/22 BEDROOM W4/22 32.87 34.98 33.93

IPR090113.xls 08/02/2013 2

PUDDING LANEHYDE


FEB 2013


HOUSE 3

R1/30 KITCHEN W1/30 26.29 28.43 27.36


R1/31 BEDROOM W1/31 29.54 30.63 30.09


R1/32 STUDY W1/32 31.52 31.93 31.73

R2/32 BEDROOM W2/32 30.74 31.09 30.92

R3/32 BEDROOM W3/32 30.29 31.60 30.95

R4/32 BEDROOM W4/32 31.42 32.76 32.09

IPR090113.xls 08/02/2013 3

PUDDING LANEHYDE


FEB 2013


HOUSE 4

R1/40 KITCHEN W1/40 28.08 30.71 29.40


R1/41 BEDROOM W1/41 31.68 32.76 32.22


R1/42 STUDY W1/42 31.96 32.43 32.20

R2/42 BEDROOM W2/42 32.28 32.81 32.55

R3/42 BEDROOM W3/42 32.21 33.55 32.88

R4/42 BEDROOM W4/42 32.03 33.41 32.72

IPR090113.xls 08/02/2013 4

PUDDING LANEHYDE


FEB 2013


HOUSE 5

R1/50 KITCHEN W1/50 27.40 29.93 28.67

R2/50 DINING W3/50 4.30 6.47 5.39R2/50 DINING W4/50 6.90 9.50 8.20R2/50 DINING W5/50 4.56 6.68 5.62R2/50 DINING W6/50 4.82 7.07 5.95 1.77 2.07 1.92

R1/51 BEDROOM W1/51 30.62 32.10 31.36


R1/52 STUDY W1/52 32.06 32.72 32.39

R2/52 BEDROOM W2/52 31.25 32.06 31.66

R3/52 BEDROOM W3/52 30.08 31.45 30.77

R4/52 BEDROOM W4/52 31.31 32.60 31.96

IPR090113.xls 08/02/2013 5

Documents

Pudding Lane Hyde Daylight and Sunlight Report …plandocs.tameside.gov.uk/anitepublicdocs/00178537.pdfPudding Lane Hyde Daylight and Sunlight Report February 2013 Page 2 1.0 Introduction