The first home to be built by a mainstream house builder aims to achieve both an outstanding environmental performance and wide public appeal.

Built in 2008 by Barratt Development PLC, its design won the 2007 Home for the Future Design Award run by the Mail on Sunday newspaper and chosen by a public vote.

Code Level 6 – designed by architects Gaunt Francis, it meets both Level 6 of the Code for Sustainable Homes and the government’s criteria for zero stamp duty.

The Barratt Green House is now being transformed in to an exhibition solely dedicated to showcasing green technologies from the Green Book. This will give Green Book listed companies the opportunity to demonstrate their products at a unique venue.


  • High levels of thermal mass reduce the need for cooling during the hotter summers predicted as a feature of climate change, while flexible internal spaces allow different layouts to suit changing family needs.
  • High performance triple glazing and thermally-broken wooden frames allow sufficient glazing to bring daylighting across the depth of the accommodation.
  • Its distinctive shutters optimise solar gain, control overheating and prevent glare, while offering potential insulation benefits.
  • A whole-house mechanical ventilation system with heat recovery (MVHR) warms incoming fresh air using heat from air exhausted from the building, and circulates it to the rooms through a ductwork system.
  • PV cells on south facing roof
  • The Green House was the subject of a rigorous, two-year scientific testing programme to assess every aspect of the design, construction and materials.



Materials & Technologies

  • Concrete wall insulated externally with 180mm foam
  • High levels of thermal mass in the aerated concrete panel structure, reducing the heating and cooling demand
  • High performance triple glazing and window shutters which optimise solar gain, control overheating and prevent glare
  • Mechanical ventilation system with heat recovery by Vortice
  • A computerised control system ensuring optimal operation of building services and providing a central data storage facility
  • Solar PV, solar thermal and an air source heat pump by Daikin
  • FSC timber used throughout
  • Rainwater harvesting
  • Sedum roof




Airtightness testing and U-value testing.


Air Tightness Result
1.00 m3/(h.m2) at 50Pa
element value U Value W/m2K
Walls  0.11
Glazing 0.68 triple windows
1.4 double glazed doors
Roof  0.11
Floor  0.11




Lead Contractor: Barratt Developments Plc

Design and Construction Team: Project Sponsors: Gaunt Francis, Architects