Welcome to the Low Energy Building Database, a repository of low-energy building information created to help inform the planning and development of low energy new build and refurbishment

You can browse projects in our database, you can also create and edit projects if you have a log-in.
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Featured Projects

About the LEB

During 2009-2010, the Technology Strategy Board implemented a £17m programme known as Retrofit for the Future (RfF), to kick-start the retrofitting of the UK's social housing stock. AECB – the sustainable building association was asked to develop appropriate energy performance targets for the competition and provide ongoing support and guidance. The AECB and the TSB have developed this database as an education and dissemination tool, incorporating both the RfF projects as well as new and refurbished domestic and non-domestic low energy buildings. Find out more about the LEB

Home energy use check

The AECB Home Energy Check helps you to see how your existing home energy use compares against retrofitted energy efficient properties entered in the AECB Low Energy Buildings database.You will only need basic information about the size of your home and the amount of fuel(s) your home uses over a twelve-month period. See how your property compares


Charts of Energy use and CO2 emissions and Airtightness compiled from aggregate data of all LEB projects.   read more

LEB Technical reference

This section of the website aims to explain  some of the issues surrounding Low energy building projects whether they are  refurbishment  or new-build projects . Energy performance ...read more

LEB News

Low Carbon Domestic Retrofit Guides

Low Carbon Domestic Retrofit Guides : The Institute for Sustainability produced a set of guides based on the experiences of the Retrofit for the Future programme. They detail the business opportunities that retrofit offers, and provide practical and commercially focused … Continue reading

Retrofit for the future

The Retrofit for the Future competition catalysed the retrofit of over 100 homes across the UK, with an ambition of achieving an 80% reduction in the in-use CO2 emissions of each property. Coordinated by the Technology Strategy Board , the … Continue reading

Low Energy Buildings is re-launched

Welcome to the  new and improved Low Energy Buildings website. This site contains information about energy efficient building projects in the United Kingdom, both  refurbishment and new-build projects. The site aims to  provide information about  techniques, strategies and materials involved … Continue reading

Steel Farm

WINNER of the UK Passivhaus Awards 2015 - Steel Farm is the first Certified Passivhaus in Northumberland. Built using traditional construction technology it is located near Hexham in the North Pennine Area of Outstanding Natural Beauty.

Passivhaus certified building

Cre8 Barn

WINNER of the UK Passivhaus Awards 2015 - The Cre8 Barn project is an innovative barn conversion to EnerPHit standard, which has transformed a derelict cow byre into an education centre for Yorkshire Wildlife Trusts Stirley Community Farm. The project features a box within a box structure (inner timber frame building within outer masonry barn) which preserves the outer appearance of the barn, while offering high levels of airtightness and continuity of insulation. The timber frame construction not only ensures thermal performance, but also helps provide structural stability to the outer masonry walls.

Passivhaus certified building

Grove Cottage

Extension & Refurbishment of Victorian Townhouse using Passivhaus methodology and CarbonLite guidance. Certified to the Passivhaus Institute's new EnerPHit (refurbishment) Standard. [NEW:Passivhaus Trust awards shortlisted project - presentation available on these pages].PHPP certification is based on 20 C, rather than the 21 C the house was heated to during 2010/11. Forecasts are based on a 'typical year' rather than the 'actual' year being monitored. Measured data here is from 2005/06 (before) and 2009/10 (after). Measured room temperatures show an average of 21 degrees centigrade during the heating season. Please note the final air leakage as certified under EnerPHit was an N50 of 1.0 ACH. When adjusted for 2010 average monthly temps.& an internal temp. of 21 C, PHPP predicted a space heat demand of 36kWh/m2.a whereas 35kWh/m2.a was measured.

Passivhaus certified building

Clapham Retrofit

This 4-storey semi-detached Grade II listed Victorian townhouse has been eco-retrofitted to a high standard of airtightness and thermal performance. The 170-year old, solid brick building has been internally retrofitted with over 9 types of insulation material, each a bespoke solution to localised performance requirements respecting the historic significance of the existing fabric. The existing sash windows and doors have been upgraded through the installation of double-glazed secondary glazing. High performance insulation materials together with careful airtightness and thermal bridge detailing have resulted in a historic building that is both highly energy efficient and more comfortable to live in.

AECB Standard certified building

Bowker Street: Terrace C

24 Homes. 12 to AECB Silver.Terrace A = 8 AECB Silver homesTerrace C = 4 AECB Silver homes

AECB Standard certified building

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