Terraced house, West London

Major refurbishment and basement extension, large terraced house, West London

Terraced house, West London


Brief and Targets: Planning Targets of EcoHomes Very Good, 40% minimum for each of 3 Categories: Energy, Water, Materials
Sustainability Initiatives: GSHP, PV panels, MVHR, ACDs plus ECDs.

Energy-critical data:

Floor area: 1,268 sqm
Mass: The site is an existing 3-storey family house. It is proposed to remodel the property using the current shell as well as building a new two-storey basement under the existing footprint and garden to accommodate swimming pool, sauna, gym facilities, cinema and staff quarters.
Structure: Existing masonry and brick envelope substantially retained with internal timber floors. New basement concrete slab on piles.

Main materials:

Walls: U-value=0.13 New external wall
Roof: U-value=0.09 Inverted roof
Floors: U-value=0.09 New basement floor
Windows: U-value=1.2, Timber low-E DG argon filled
Doors: U-value=1.2, Timber insulated
Air-permeability: Design Air permeability rate –3 m3/h.m2 @50Pa
Psi-values: ACDs plus ECDs
Insulation: GWP<5 (various)
Heating: Ground source heat pump - Mitsubishi 2no. type: PQRY P400
Controls: Time and Temperature Zone Control
Hot water: HWS Calorifiers - Smartline 2no
Ventilation: Continuous trickle and boost MVHR or all areas from raised Ground floor down to basement level.
Cooling: From GSHP (Heat Recovery Heat Pump System) split and multi split
Renewables: 4kWp PV panel
Low E lighting: To be 100% low-e lights or LEDs

Points of Interest:

Planning / Building Control uncertainty over which Part L type (1A or 1B) should be used. This added to Client costs from using a twin-track approach to the design until agreement was found: EcoHomes Very Good and Code for Sustainable Homes Level 4. Abba successfully argued that Part L1B was appropriate.
"This is our first experience of working with Abba – they have been professional, constructive and helpful and we would certainly look to use them again on our next project." - Gradeview Properties

Sensible Energy Saving Tip

Boil the amount of water you need for one cup of tea, rather than half a kettle full. It will save time, energy - and money.

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