Semi-detached house, West London

Major remodelling and basement extension, substantial semi-detached house, West London

Semi-detached house, West London


Brief and Targets: Planning Targets of EcoHomes Very Good, 40% minimum for each of 3 Categories: Energy, Water, Materials
Sustainability Initiatives:
Results: Achieved Very Good rating and the 40% targets for Energy, Water and materials.

Energy-critical data:

Floor area: 677 m²
Mass: Existing semi-detached 4-storey family house. It is proposed to remodel the property using the current shell as well as building a new basement under the existing footprint to create a gym and pool complex with additional accommodation for staff under the front garden area.
Structure: Existing frame, New Steel frame to the basement.

Main materials:

Walls: U= 0.28, Typical external wall, cavity brickwork outer leaf, block inner leaf, celotex. U = 0.28, Basement wall, reinforced concrete, insulation, aerated block, render.
Roof: U =0.16, Pitched roof, ceiling at rafter line. U =0.17, Flat roof with insulation between joists.
Floors: U =0.17, Screeded concrete slab.
Windows: U-value =1.40, New timber frame windows.
Air-permeability: Default value
Psi-values: Default value
Insulation: GWP<5 (various)
Heating: 2 no. Heston Heat 45 Boilers, Emitters –Radiators and Underfloor heating system
Controls: Time and temperature zone control
Hot water: 700 Litres HWC
Ventilation: Extract ventilation to kitchen, utility rooms and bathrooms.
Cooling: Daikin RXS50L2V1B (Basement: Gym & media room, LGF: Family room & Casual Dining, UGF: Drawing room & Dining room, 1F: Master bedroom & dressing room, 2F: All 3no. bedrooms)
Renewables: None
Low E lighting: 85% Low-E Lighting

Points of Interest:

Removal of the entire ground floor and walls, including support of the whole upper floor structure on a steel frame to enable clear basement dig on a tight site with only main road access, limited road parking.
"Abba Energy provided us with a thoroughly comprehensive and efficient service from the inception of the project to final completion.  They guided all concerned - including the contractor – through the requirements necessary to achieve the EcoHomes ‘very good’ target with professionalism and understanding." - Barroll Webber

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New Build or Domestic Refurbishment? Call Abba Energy on 020 8208 8333 for expert advice on Sustainable Housing Design and Construction.