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STATEMENT OF ENVIRONMENTAL EFFECTS For Proposed Alterations and Additions at 28 Blakesley Street Chatswood NSW 2067
ISSUED FOR
DATE
Preliminary
04/10/10
Prepared by
KORIMBIAdesign Patricia C. Chow, heritage architect (reg.no.8427) Level 6, 10 Help St, Chatswood NSW 2067 P:(02)9911 4091 F:9911 4001 M:0422 180 247 E:
[email protected] Web http://korimbia-design.hopout.com.au
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Table of Contents
1 INTRODUCTION..............................................................................................................................................3
1.1 GENERAL...............................................................................................................3 1.2 ADDRESS AND PROPERTY DESCRIPTION..............................................................3 1.3 STATUTORY CONTROLS........................................................................................6 1.4 PROPOSED SCOPE OF WORKS..............................................................................6 2 ENVIRONMENTAL EFFECTS.........................................................................................................................7
2.1 DEMOLITION........................................................................................................7 2.2 DENSITY - FLOOR SPACE RATIO............................................................................7 2.3 BUILDING HEIGHT PLANES, SETBACKS.................................................................7 2.4 STREETSCAPE & HERITAGE...................................................................................8 2.5 OPEN SPACE.........................................................................................................8 2.6 PRIVACY, SOLAR ACCESS .....................................................................................9 2.7 LANDSCAPING......................................................................................................9 2.8 SUSTAINABLE DEVELOPMENT..............................................................................9 2.9 WASTE MANAGEMENT......................................................................................10 3 APPENDIX......................................................................................................................................................12
WASTE MANAGEMENT PLAN WDCP SUSTAINABILITY SCORECARD
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Introduction
1.1
GENERAL
Patricia Chow of KORIMBIA Design has been engaged by Mrs C. Hsu, to prepare and submit a Development Application (DA) for alterations and additions to the property at 28 Blakesley Street, Chatswood. A Pre-DA meeting was held on 16th July 2010, with Willoughby Council Planner, Mr Ian Arnott, and the advice proceeding from the meeting has been considered in the proposal. 1.2
ADDRESS AND PROPERTY DESCRIPTION
The subject site is at no.28 Blakesley Street, Chatswood, New South Wales 2067. The allotment is identified as Lot 20, DP3372. Blakesley St runs roughly northwest, between Beauchamp Park situated at the northern end and Victoria Avenue at the southern end; no.28 lies on the eastern side of the street. The site is a rectangular block, as are the other properties in the street, and the site area, as shown on the survey plan, is 562m2. Structures on the property include: a single storey brick dwelling with Marseilles tiled roofing; a weatherboard and corrugated metal addition; and a brick and tiled roof garage in the rear corner of the block. North Figure 1.1 Location Map, (google earth.com)
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Figure 1.2 Front of no.28 Blakesley Street, western facade.
Figure 1.3 Rear yard and existing weatherboard extension, eastern facade (June 2010).
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Figure 1.4 View of northern side of house.
Figure 1.5 Existing brick garage.
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1.3
STATUTORY CONTROLS
1.3.1 Local Government
Local environmental plans (LEP) are prepared by councils and shires under the NSW Environmental Planning and Assessment Act 1979. The site, 28 Blakesley St, lies in Willoughby Council local government area, and its planning controls are set out in Willoughby Local Environmental Plan 1995 (WLEP1995). The Draft Willoughby Local Environmental Plan 2009 has yet to be adopted. The site is in a low density residential zone: 2a. Additional provisions for development are set out in the Willoughby Development Control Plan (WDCP). The subject site lies within the North Chatswood Conservation Area as described in the WDCP. Refer to the Heritage Impact Statement/Report for further details regarding the NSW Heritage Act 1977 and other heritage issues. 1.4
PROPOSED SCOPE OF WORKS
The proposed work involves alterations and additions to the existing property, including the following: a) Demolition of the existing weatherboard extension, corrugated metal skillion roof, and part of a brick wall under the skillion roof. The sandstone wall base, which exists under the skillion area, will be salvaged. If the client's budget allows, the sandstone would be reused in the garden retaining walls, otherwise it will be recycled off site. b) Partial demolition of the existing laundry facility in the garage, and re-roofing of the reduced garage structure. c) Addition of a split level living space, kitchen, bathroom, and internal laundry to the rear of the existing house. d) A new car port and partial renewal of the concrete driveway strips. e) New landscaping to the rear, and removal of two large existing camellias and a fruit tree from the driveway. f) Widening of the driveway entry by re-locating the end pier of the existing brick fencing.
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Environmental Effects The environmental effects of the proposal can be measured against the requirements of the Willoughby Council DCP. The property will retain its use as a single dwelling house.
2.1
DEMOLITION
The proposed part of the house to be demolished will not affect the heritage values of the conservation zone. (Refer to heritage impact statement.)
2.2
DENSITY - FLOOR SPACE RATIO
The existing brick garage has an old laundry and storage space within it. The garage will be reduced in size to remove the old laundry and thus reduce the gross floor area associated with it. (Refer drawing DA08 Areas.) The site is in a council Conservation Zone, and the maximum permissible Floor Space Ratio (FSR) is 0.4:1 [Part H, Clause x LEP]. Maximum permissible Gross Floor Area = 0.4 x 562m2 =224.8m2 The FSR calculations are also shown on Arch. Drawing No. DA02. The proposed Gross Floor Area (GFA) is: 111.1m2 (Existing house)+ 110.3m2 (addition) + 3.5m2 (garage storage) =224.9m2 Storage space in garage calculation: (GFA garage) – (allowable garage) = GFA of storage space 21.8 – 18.3 = 3.5m2 The proposed GFA is slightly over the maximum allowable by a negligible amount (0.1m2), and it is submitted that this constitutes compliance with WDCP.
2.3
BUILDING HEIGHT PLANES, SETBACKS
The proposed additions are a single storey, split level design due to the natural fall of the site, and are within the Council's specified building height planes, as shown on the submitted Section drawings. The front setback is existing and no major works are proposed to the front of the property. The side setbacks of the new work match the existing building, 1.5m on 28 Blakesley St Chatswood
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the northern side, and a wider 3.7 – 3.8m setback on the southern side, where a driveway exists. The rear setback to the proposed addition is 8.3m, which is less than the two adjacent properties, however, it is comparable to other nearby properties (e.g. no.24 and 32, refer to aerial image, Fig1.1) on Blakesley St.
2.4
STREETSCAPE & HERITAGE
As the subject site is in a Conservation Zone, no major works are proposed at the front portion of the property. Some maintenance works are proposed, which include remediation of cracking in the brickwork of the verandah; infilling of the former side entry at the boundary brick fence with matching brickwork; and new low height powdercoated steel gates to the driveway. These works would be in character with the existing house and not have any negative impact on the streetscape. The current driveway entry is rather narrow for today's average sized sedan, hence it is proposed to widen the driveway by relocating the last brick pier of the front fencing to minimise any visual impact. The new addition would be a single storey structure, which has a roof and building proportions sympathetic to the heritage character of the existing house and would have no noticeable visual impact on the streetscape. The proposed finishes and colour scheme of the new works are complementary to the existing building, and are basically earth tones (Refer to Finishes Schedule). A new carport is proposed to accommodate a second car space, instead of the alternative of having a bulky double garage structure. These alterations would have minimal visual impacts.
2.5
OPEN SPACE
The proposed works will result in a dwelling with 3 bedrooms and a study, or 4 bedrooms. The minimum Private Open Space (POS) required for a 4 bedroom dwelling is 150m2. Between the main house and the (reduced) garage will be a good sized yard of 94.3m2 , which is slightly over the requirement for a 3 bedroom dwelling. The private driveway between the new Carport and the front building line encompasses 64.5m2 . These last two figures add up to 158.8m2, which complies with the requirement for POS for a 4 bedroom dwelling. The front yard in front of the building line has not been included.
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2.6
PRIVACY, SOLAR ACCESS
The new addition is stepped down from the front part of the existing, due to the fall of the site. Because the new work is single storey and set down a level, privacy and overshadowing would not be an issue for neighbouring properties. The existing 1.6 - 1.8m high timber fencing and setbacks on the side boundaries would provide adequate privacy to neighbours. The main living areas will be in the new addition, and have good solar access due to the northern and eastern aspect these spaces have.
2.7
LANDSCAPING
(Refer drawing DA08 Areas). Minimum Soft Landscaping required = (0.5 x 562m2 site area) – 60 = 221m2 Proposed Soft Landscaping = front front north side rear
43.5 + 23.6 47.5 45.8 160.4m2
The proposed area of soft landscaping is 160.4m2 , which is 60.6m2 below the minimum required. In consideration of the heritage conservation zone and other design decisions a single storey addition has been proposed, in lieu of a more visually prominent two storey proposal, which would have a greater area of soft landscaping. It is also noted that a significant area of additional turfed area exists at the driveway, which is divided by two narrow concrete strips, and this area of turf adds up to 55.6m2 . The WDCP discounts area less than 1.5m in any particular dimension, however the driveway is on average 3.4m wide, albeit it is divided by the two narrow wheel strips. It is requested that Council consider the proposed soft landscaping component favourably in view of the above mitigating circumstances of heritage impact and the additional grass area in the driveway.
2.8
SUSTAINABLE DEVELOPMENT
The subject property exists within an established suburban setting, close to the centre of Chatswood CBD, therefore the proposed new work would not have any significant impacts on the natural environment, including threatened species, and ecological communities.
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Due to the split level design, a small amount of excavation would be required but only on the northern side, as the land falls to the south. A garden bed with low height timber sleeper edges would suffice to retain the different height levels. Sediment Control Sediment control during demolition and construction phases would incorporate the use of: • Sediment control fencing, where soil has been exposed. • Sandbagging (fabric bags filled with gravel) at gutter to prevent sediment washing into the drainage system. This proposal recommends that a number of initiatives be considered by the client: There will be minimal use of PVC’s and other petro-chemical products, which reduces emissions. That paints used internally will be low VOC/low toxic, which reduces emissions. That timbers will be sourced from ecologically sustainable forests. That new electrical appliances be selected for energy-efficiency. A Basix Certificate has been obtained for this proposal, and items such as new tap fixtures will be selected for water-efficiency, adequate roof insulation, adequate shading of window glass, etc. A 3000 litre rain water tank (RWT) will be provided to store water for use in the garden and for toilet flushing. Refer to appendix for WDCP Sustainability Scorecard.
2.9
WASTE MANAGEMENT
The waste generated from proposed demolition and building works would be carried out by an approved waste management contractor, and all recyclables and other demolition materials would be removed from site in accordance with statutory requirements and appropriate guidelines. A Waste Management Plan has been provided in the Appendix.
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Conclusion The proposed works under this DA, for the project at 28 Blakesley Street, involve alterations and additions to the rear of the property and minor maintenance works at the front. The scale of the work is essentially a single storey split over two levels due to the natural fall of the site. This approach has the advantage of imposing less impact on the streetscape, a Council conservation zone, and less bulk, height scale, and overshadowing on surrounding neighbours. The FSR and open space requirements also comply with WDCP. The natural landscaping area falls below the requirement, as explained in section 2.7, however, there are mitigating circumstances, e.g. low heritage impact and additional grass area in the driveway. On balance, the design proposal complies with the objectives of Council’s WDCP and will be a highly positive addition to the built fabric of the local area.
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Appendix
3.1.1 WASTE MANAGEMENT PLAN
Notes: stated volumes below are indicative only at this early stage of the proposal. The Contractor must undertake to provide adequate recycling/sorting areas on site and have the materials collected as necessary. STAGE: DEMOLITION MATERIAL ESTIMATED VOLUME (m3)
RE-USE, RECYCLING 1. on-site 2. off-site
DISPOSAL
Rest to landfill
EXCAVATION MATERIAL
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a) Stock-pile & reuse topsoil for landscaping
GREEN WASTE
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Chip for re-use as mulch in front garden beds
BRICKS
2
b) crushed/recycled by e.g. Bingo, Homebush Bay
CONCRETE
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b) crushed/recycled by Bingo, Homebush Bay
TIMBER
5
b) crushed/recycled by Bingo, Homebush Bay
PLASTERBOARD
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b) crushed/recycled Rest to landfill by by Bingo, Homebush Bingo, Homebush Bay Bay
METALS
2
b) some to North Rest to landfill by Shore Metal Bingo, Homebush Recyclers, Artarmon Bay
Windows/doors
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b) to (Reverse Garbage, Marrickville)
Sandstone blocks
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Stockpile some for landscaping, rest to be recycled to landscape supplier
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OTHER:
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