House side return Crouch Hill N19

Ground floor rear / side extension, roof extension, external and internal alterations to conclude a full renovation of a single family dwelling.

Window replacement, external wall insulation, and charred vertical timber cladding as part of an environmental and energy efficient approach to this house renovation.

Planning matters.

“The proposed development would remove a small lean-to shed of the rear elevation of the outrigger which extends approximately 2.5m and erect a full width rear extension and infill extension. The infill extension would infill the space between the side of the outrigger and the neighbouring boundary and extend beyond the rear of the outrigger by 3m; the extension would be 3m in height. The extension would be rendered and clad in vertical timber cladding, three aluminium sliding doors are proposed on rear elevation of the extension, and three roof lights are proposed, two on the infill section and one on the extension section beyond the outrigger. It is also proposed to replace all of the windows throughout the property with timber double glazed sash units.

The proposed development is a contemporary design with the flat roof design incorporating vertical timber cladding, and it would be contained to the ground floor of the building. It would be similar in design to neighbouring extensions, and in keeping with the local character. The extensions would be high-quality and would not extend into the rear garden a significant amount, leaving a considerable amount of useable amenity space in the garden.

The proposed replacement windows with double glazed timber sash windows is particularly welcome as the current metal windows on the front elevation are not in keeping with neighbouring styles or materials and their replacement to timber would enhance the streetscape.
Conclusion – It is recommended that planning permission is granted subject to conditions.”

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Sustainability matters.

• Introduction of a rainwater harvesting system taking rainwater from the main roof at high level to be used for garden water use.
• Introduction of a soft landscaping scheme for part of the rear garden area to assist with biodiversity, sustainable drainage and to minimise the risk of flooding; any hard landscaping will be permeable at the front and rear of the property.
• Fabric first approach – we propose the introduction of a painted render system to enclose the fabric envelop of the house. This will reduce heat losses, improve airtightness, deal with cold-bridging and internal air quality (prevention of condensation and mould).
• Window replacement with new double glazed units – once we insulate the main fabric of the house we will make sure that we minimise the heat losses and heat escaping through the glazing and junctions between walls and windows.
• Central heating and hot water system – New boiler to replace existing boiler; the new boiler will be selected to be able to intergrade with a air source heat pump that is to be installed at a later stage. Underfloor heating on the ground floor.
• Rewiring and replumbing across the house – to improve energy use and efficiency.
• Extension insulation levels – the cavity walls have been designed with a 150mm cavity to allow for additional insulation to exceed the requirements of the current Building Regulations.
• Orientation and overheating – the rear extension is facing mostly north and there are no particular concerns in regards to overheating and with meeting the relevant Building Regulations requirements.
• Specification of sanitaryware and taps to ensure that the estimated consumption of water does not exceed 125 litres/person/day in accordance with Regulation 36 and Requirement G2.
• Introduction of low energy light fittings to the new extension and to the rest of the house.
• A site waste management plan will be developed prior to commencement of construction to inform the adoption of good practice waste minimisation in design.
• Thermal Bridging – Elimination of Thermal Bridging with the introduction of external insulation; it creates a solid thermal envelop, prevents condensation and mould build up on the internal surfaces, it contributes to high levels of internal air quality, and it minimises heat losses.
• Airtightness – The internal wall surfaces will be re-rendered to provide high levels of airtightness, every effort will be made to seal wall / floor, wall / ceiling junctions, and openings through fabric with specialist membranes and tapes, and we propose the replacement of the existing windows with new double glazed window products.

Read our Islington residential architect and planning guide that includes detailed planning and design advice for your home project.