Applicant: Loughglynn Developments Limited · sp 98.03 top of bank 97.56 97.26 top of bank 95.74...
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1 Daylight & Sunlight Assessments of Proposed Housing Development at Grange End, Dunshaughlin, Co. Meath Applicant: Loughglynn Developments Limited Date: May 2020 Prepared by John Healy MSc Environmental Design of Buildings 1 Rathmines Road Upper, Dublin 6, D06 Y5P5 tel 01 4965340 email [email protected] web digitaldimensions.ie Digital Dimensions Ltd trading as Digital Dimensions.
Transcript of Applicant: Loughglynn Developments Limited · sp 98.03 top of bank 97.56 97.26 top of bank 95.74...
DRAFT
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Daylight & Sunlight Assessments of Proposed Housing Development at Grange End, Dunshaughlin, Co. Meath
Applicant: Loughglynn Developments LimitedDate: May 2020
Prepared by John HealyMSc Environmental Design of Buildings
1 Rathmines Road Upper, Dublin 6, D06 Y5P5 tel 01 4965340 email [email protected] web digitaldimensions.ie Digital Dimensions Ltd trading as Digital Dimensions.
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1. Introduction
This proposed residential development is at Grange End, Dunshaughlin Co. Meath. The application site is located in a greenfield site to the East of the town. The site is bounded by the R125 and a the proposed new distributor road. There is a housing estate, Grange Park to the South West.
The proposed development consists of 2 storey houses, 3 - 4 storey apartment blocks and a creche building. There are a number of amenity spaces throughout the development.
The calculations are based on the drawings prepared by O’Daly Architects.
The results find that there would be no impact on the neighbouring dwellings or amenities and there would be good quality daylight in the apartments analysed. The amenity spaces would meet the BRE criteria for Open Space and Gardens. The proposed development meets the recommendations of the BRE guidelines.
2. Methodology
2.1 Notes on the use of BS 8026-2 2008 and BRE guidance document (2011) “Site layout planning for daylight and sunlight”.
To date, it is understood that no standards or guidance documents (statutory or otherwise) on the subject of sunlight access to buildings or open spaces or daylight access to buildings have been prepared or published in Ireland. Sustainable Urban Housing: Design Standards for New Apartments, Guidelines for Planning Authorities 2018 directs Planning authorities to have regard to quantitative performance approaches to daylight provision outlined in guides like the BRE guide ‘Site Layout Planning for Daylight and Sunlight’ (2nd edition) or British Standard BS 8206-2: 2008 – ‘Lighting for Buildings – Part 2: Code of Practice for Daylighting’. The standards for daylight and sunlight access in buildings (and the methodologies for assessment of same) suggested in both of these documents have been referenced in this Sunlight and Daylight Access Analysis. Neither the British Standard nor the BRE Guide set out rigid standards or limits. The BRE Guide is preceded by the following very clear warning as to how the design advice contained therein should be used: “The advice given here is not mandatory and the guide should not be seen as an instrument of planning policy; its aims 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.” That the recommendations of the BRE Guide are not suitable for rigid application to all develop-ments in all contexts is of particular importance in the context of national and local policies for the consolidation and densification of urban areas. Given that the British Standard and the BRE Guide was drafted in the UK in the context of UK strategic planning policy, recommendations or advices provided in either document that have the potential to conflict with Irish statutory planning policy have been disregarded for the purposes of this analysis.
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2.3 Sunlight to gardens and open spaces
For calculations of sunlight analysis it is general practice to use March 21 and the recommenda-tions of the BRE guidance document (2011) “Site layout planning for daylight and sunlight”. P.J Littlefair, in relation to Gardens and open spaces section 3.3.17 state:
“It is recommended that for it to appear adequately sunlit throughout the year, at least half of a garden or amenity area 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 sun on 21 March is less than 0.8 times its former value, then the loss of sunlight is likely to be noticeable. If a detailed calculation cannot be carried out, it is recom-mended that the centre of the area should receive at least two hours of sunlight on 21 March.”The BRE Guidance document recommends “To assess loss of sunlight to an existing building, it is suggested that all main living rooms of dwellings, and conservatories, should be checked if they have a window facing within 90º of due south.”
2.4 Daylight in the proposed development.
The proposed project is analysed in plan & section, and building use. The rooms judged to have the potential for the lowest levels of daylight are selected as worst case scenarios and assessed for Average Daylight Factor (ADF).
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GRANGE PARK
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BLOCK F
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Figure 1. Aerial view of site.
3. Proposed Project Description
SITE
Figure 2. Proposed site plan
N
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Figure 3. View towards the proposed site, from The R125
Figure 4. View East towards the site, with Grange Park to the South
SITE
The site is bounded by two roads, the R125 to the North and a the proposed new distributor road to the East. The housing estate, Grange Park is to the South West.
Due to it’s location, this development has would not impact on the Daylight or Sunlight amenity of any neighbouring property. Within the development, the buildings are predominately low rise, of the scale and distances typical of the adjacent housing estate.
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4. Assessment of Daylight in the Proposed Development.
The BRE guidelines recommend that the Average Daylight Factor be assessed in new developments. BS 8206-2 gives minimum values of ADF of 2% for kitchens and living rooms which include a kitchen, 1.5% for living rooms and 1% for bedrooms. An average daylight factor of 5% is a well daylit space.
The overall development was examined for daylight. Factors influencing daylight include room depth, area in relation to area of window, single aspect and closeness to an adjacent obstruction mass. Only living rooms, kitchens and bedrooms are required to be assessed.
The low rise nature of the housing estate means that the house are likely to have a good quality of both daylight, internally and sunlight, externally. Equally the apartment blocks are well laid out, many have dual aspect living spaces. The ground floor windows have a higher lintel, at 2250m, affording a deeper penetration of daylight into the rooms.
Blocks A, B & CThese blocks have good orientation, all living-spaces are dual aspect with at least one window unobstructed by a balcony above.
Figure 5. Ground floor plan of Blocks A, B & C
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Figure 7. Ground floor plan of Block F, showing unit tested for ADF. Blocks D and E have the same layout.
Figure 6. Site plan showing location of unit assessed for Average Daylight Factor94
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BUILDING
97.471
98.04EIR
EP
97.6
42
96.04
5
FENCE
96.62
2
96.47
496.
653
96.7
79
96.6
17
POST&W
IRE FENCE96.616
94.875
95.026
94.491
94.444
94.402
93.953
93.570
93.730
93.758
GATE
GATE
GATE
GATE
HEDGE
95.003IL
95.880IL
97.011IL
94.814IL
94.753IL
95.062IL
95.019IL
94.960IL
CL97.359MH
97.28
97.21
ROAD
97.40
97.57
97.83
97.99
98.11
97.98
97.86
97.34
97.45
97.69
97.70
97.70
97.80
97.97
98.02
97.98
96.6897.13
96.79
93.67
93.80
93.93
93.77
93.59
94.12
94.46
94.27
94.43
94.47
94.55
94.46
95.01
95.19
95.1094.91
95.25
95.5795.68
96.20
96.7597.08
96.77
95.51
95.24
95.44
94.83
94.81
94.8494.67
94.86
95.00
94.95
94.84
94.65
94.52
94.65
93.98
94.51
94.47
95.01
95.01
95.24
95.34
95.44
95.2295.39
95.67
95.26
95.76
96.47
96.91
97.02
95.65
95.52
95.35
95.59
95.39
95.31
94.94
95.41
95.51
95.44
95.50
96.15
96.72
97.46
97.69
97.53
97.61
96.88
96.64
96.73
96.46
96.28
95.89
95.91
95.72
95.66
95.83
96.03
96.30
96.26
96.44
96.57
96.61
96.90
97.07
97.11
97.07
97.21
97.30
97.28
97.71
97.24
97.17
97.39
97.09
96.90
96.70
96.42
96.3596.18
96.27
95.94
95.72
95.65
95.9495.97
95.6495.65
95.82
96.27
96.44
96.66
96.89
97.18
97.16
97.48
97.11
97.28
96.93
96.85
96.83
96.93
96.6796.73
96.9196.81
96.90
96.56
96.48
96.51
96.85
97.05
97.21
97.06
97.42
97.51
97.05 97.36
97.52
97.5697.53
97.2097.00
97.25
97.0697.08
96.8596.41
96.3196.30
96.61
96.38
96.53
96.28
96.3096.08
96.32
96.5996.25
96.3996.18
95.96
96.2895.63
95.80
95.3995.76
95.3195.51
95.43
95.0895.20
95.14 94.85 94.83
94.53
94.73
94.81
94.57
95.11
94.75
95.34
95.50
95.63
95.7995.94
95.6395.66
95.59
96.15
95.61
95.92
95.64
95.64
96.51
96.23
96.39
96.9097.0297.2897.8198.12
96.26
96.31
96.60
97.28
98.36
98.39
97.75
97.07
96.49
98.70
97.18
96.544
96.080
96.85
TB
96.73
96.7196.63
96.57
96.53
96.30
96.56
96.12
96.02
96.0
096
.58
96.5
5
97.5997.69
96.05
96.64
95.92
95.60
95.5896.00
96.15
96.06
96.28
97.06
96.8996.20
96.31
96.1
4
95.4895.14 94.84
94.3593.83
95.42TB
95.41 95.25 95.0194.54
94.61 93.84
EXISTING DRAIN
EXISTING DRAIN
POST&W
IRE FENCE
96.500
96.500
98.500
BB
CRUSH97.53
97.22
97.44
97.14
96.57
95.96
95.78
95.77
95.93
96.18
95.76
95.46
95.75
95.70
95.60
95.80
95.89
95.68
95.93
95.18
95.22
95.8095.48
95.49
95.61
95.29TB
95.00
0
95.500
96.000
96.500
94.23
94.3694.21
94.44
94.25
94.32
94.59
94.96
95.11
95.14
94.93
94.78
94.59
94.55
94.52
95.56
95.31
95.65
95.77
95.67
95.09
94.95
94.85
94.55
94.44 94.63
94.36
94.52
94.63
94.77
94.73
95.02
94.78
95.57
96.11
96.01
95.84
96.75
94.43TB
94.68 94.94
94.55
97.000
97.0
00
97.500
100.22EAVES
GATE
102.526RIDGE
97.17
97.1297.1197.08
97.02
97.18
97.16
97.31
97.17
97.22
97.44
97.5597.41
97.36 97.29 97.01
96.78
96.78
97.0897.2697.53
97.3596.984
97.087
97.216
97.158
97.03
96.86
97.1697.31
BUILDING
97.45
Block F Block E
Block DTest Apt
69
70
47
77
94
95 99
98
101
100
92
91
90
105
93
102
104
103
BLOCK D
150 - 167
BLOCK E
132 - 149
88
87
86
109
89
106
108
10778
8081
7273
7576
85
84
83
82
113
112
111
110
Creche
46
45
44
43
42
71
BLOCK F
114 -131 Bikes & Bins
Bikes & Bins
Bikes & Bins
NEW
SECTION
OF DISTRIBU
TOR RO
AD
NEW SECTIO
N OF DISTRIBUTO
R ROAD
79
74
Block D
N
Blocks D, E & F
These blocks are well laid out, with all living-spaces and terraces facing South or West. The corner apartments have dual aspect rooms. A single unit was selected for testing, as a worst case scenario. The results are set out in Table 1 below. Location plans are shown in Figures 6 & 7, Generated analysis is shown in Figure 8.
F01
F02F03
DRAFT
8
Average Daylight Factor (ADF)Location Use Daylight Factor
ADF Minimum ADF
Block F Ground Floor
F01 Livingroom & Kitchen 5.52 2F02 Bedroom 1 5.69 1F03 Bedroom 2 7.67 1
Table 2: Average Daylight Factor for the identified worst case units.
Within the development the design was optimised with regard to the BRE guidelines. Bedrooms and living rooms in a unit, in the most challenged position, was assessed; these well exceed the minimum ADF. All rooms should receive good daylight.
Conclusion All habitable rooms in the unit assessed exceed the minimum levels set out and meet the recommendations of the BRE Guidelines and BS8208 Part 2:2008 Lighting for Buildings, Code of Practice for Daylighting.
Figure 8. Generated analysis for Average Daylight Factor (ADF) of the selected ground floor unit in Block F. The scale represents the percentage of daylight received from 0 - 10 hours.
Livingroom/ Kitchen
Bedroom 1Bedroom 2
F01
F03 F02
N
DRAFT
9
5. Sunlight to gardens and open spaces
Figure 9. Site plan indicating public open space / amenity areas.
This is a predominantly low rise development with a number of areas of amenity, the extent of which can be seen in Figure 8 above. The majority of the public open space will receive in excess of 2 hours sunlight during the course of the day on the 21st March as it is to the south of the development and a detailed assessment is not required. This can be seen in a visual inspection of the shadow diagrams in Appendix A.
ConclusionThere will be no reduction in the available sunlight on the ground to any adjacent residences. The amenity space to the proposed development meets the recommendations of the BRE guidelines and will receive in excess of 2 hours sunlight over 50% of the open space.
N
DRAFT
10
Figure 10. Shadow diagrams 21 March 8:00 GMT
Appendix A
Shadow Casting diagrams March Equinox
The BRE guidelines recommend using the 21st March for plotting shadow diagrams. June 21st and December 21st are provided for information but it should be noted that the summer solstice is the best case scenario with shadows at their shortest. In Winter even low buildings will cast long shadows and it is common for large areas of the ground to be in shadow.
Figures 9- 14 show the existing and proposed Shadow diagrams for the Equinox on the 21st March at 2 hourly intervals during the day.
N
DRAFT
11
Figure 11. Shadow diagrams 21 March 10:00 GMT
Appendix AShadow Casting diagrams March Equinox
N
DRAFT
12
Figure 12. Shadow diagrams 21 March 12:00 GMT
Shadow Casting diagrams March Equinox
N
DRAFT
13
Figure 13. Shadow diagrams 21 March 14:00 GMT
Shadow Casting diagrams March Equinox
N
DRAFT
14
Figure 14. Shadow diagrams 21 March 16:00 GMT
Shadow Casting diagrams March Equinox
N
DRAFT
15
Figure 15. Shadow diagrams 21 March 17:00 GMT
Shadow Casting diagrams March Equinox
N
DRAFT
16
Figure 16. Shadow diagrams 21 June 09:00 GMT
Shadow Casting diagrams June Solstice
N
DRAFT
17
Figure 17. Shadow diagrams 21 June 12:00 GMT
Shadow Casting diagrams June Solstice
N
DRAFT
18
Figure 18. Shadow diagrams 21 June 15:00 GMT
Shadow Casting diagrams June Solstice
N
DRAFT
19
Figure 19. Shadow diagrams 21 June 18:00 GMT
Shadow Casting diagrams June Solstice
N
DRAFT
20
Figure 20. Shadow diagrams 21 December 10:00 GMT
Shadow Casting diagrams December Solstice
N
DRAFT
21
Figure 21. Shadow diagrams 21 December 12:00 GMT
Shadow Casting diagrams December Solstice
N
DRAFT
22
Figure 22. Shadow diagrams 21 December 14:00 GMT
Shadow Casting diagrams December Solstice
N
