High Performance Windows And Doors Included In Massive London Retrofit

Sutton houses

Engie has been appointed to make thousands of homes low maintenance and ultra-low carbon with windows and doors high on the list of retrofit options. 

The design, build and fit programme to transform existing properties will be undertaken by Engie on behalf of London's Sutton Housing Partnership (SHP).

Engie will utilise its recently launched whole house retrofit model - Engie Zero - to deliver a pilot project to an initial eight homes in one of the first schemes of its type within the London boundary, which is part of the Mayor of London’s Energy Leap Initiative.

SHP has received capital funding to allow the homes to undergo a programme of works which will result in energy savings far exceeding standard retrofit approaches - with a 30 year performance guarantee. Additional support has been provided through the Mayor of London’s Retrofit Accelerator Homes programme, with SHP keen to roll out the approach to additional homes next year.



ENGIE Zero offers a one stop shop for local authorities, housing associations and registered providers to decentralise, digitalise and decarbonise homes in a way that is derived from the Energiesprong performance standard.

For more on Energiesprong - Click Here



What's in the deal?

Energy efficiency measures delivered by Engie for SHP will include an air tight wrap to the eight selected properties, as well as installing a pre-fabricated super insulated facade and roof system with integrated solar PV panels to generate electricity at the point of use.

New high performance windows and doors will replace older models and air source heat pumps will also introduce renewable heating.



These works coupled with a real time monitoring and maintenance programme will ensure occupant satisfaction and building energy performance.

Engie Zero can show savings against a ‘business as usual’ scenario for clients’ planned and responsive investment budgets and deployed patient capital.

These savings are combined with other revenue streams and government incentives to finance the upfront costs of the works.


 “This is a commendable venture from the Mayor of London, Sutton Housing Partnership and Sutton Council.  The climate emergency remains the single biggest threat we face and London’s existing buildings are responsible for nearly 80 per cent of city’s CO2 emissions - so investment in retrofitting existing stock is paramount.”

– James Cook 

Divisional Director, Engie UK & Ireland



Picture: Houses in Sutton (not the actual project) are to be given energy efficient upgrades, including new high performance windows and doors, by Engie.


Article written by Cathryn Ellis
13th November 2020


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