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.
New users can create an account.

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

1970s Lancaster retrofit

Retrofit of 1970s semi-detached house using IWI. Designed, built and certified to the AECB Retrofit Standard - Level 2.

AECB Standard certified building

Old Holloway

A seductively simple self-build utilising an innovative pre-fabricated straw-bale/ timber construction. Perservering through a 4 year planning process, the single storey detached home sits snuggly within its rural surroundings.The proposal creates an informal courtyard utilising the existing huts on site and the dwelling an arrangement that is typical for the local area. The scale and massing of the simple single-storey detached dwelling, with pitched roof and south facing verandah, is sympathetic to local vernacular architecture.

Passivhaus certified building

Lancaster Cohousing Project

Lancaster Cohousing Project is a certified Passivhaus / Code for Sustainable Homes Level 6 (carbon neutral) and Life Time Homes, affordable community housing project. This groundbreaking exemplary (car free) owner occupied eco housing project has evolved through a participatory design process with the 41 individual householders and EcoArc Architects.The aim was to design a neighbourhood based upon Passivhaus / ecological values, where it is very easy to live a low carbon, sustainable lifestyle.

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

Wilkinson Primary School

WINNER of the UK Passivhaus Awards 2015 - Wilkinson Primary School is a 2nd generation Passivhaus primary school designed by Architype. Taking the brief beyond the necessary requirements, Architype addressed the schools future needs as a 21st century learning environment, introducing a number of innovations to improve the performance and sustainabilityof the building.

Passivhaus certified building

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