Passivhaus Affiliate

Grandys Croft Retrofit Site Visit

Date: 23 & 24 November 2015 Time: 14.00 & 10.00
Location: Grandys Croft, Solihull, Birmingham, B37 5BU Cost: Free, limited places

Using Innovate UK funding, Encraft and Beattie Passive are trialing a whole building retrofit solution known as OWLS (Off-Site Wrap-Around Large Scale Retrofit) at Grandy’s Croft. Other partners on the project include Solihull Metropolitan Borough Council, Solihull Community Housing and Coventry University. On site works got underway at Grandy’s Croft in September 2015.

Grandys Croft Retrofit site visit 23-24 November 2015

The innovative OWLS solution will deep retrofit a block of flats providing a completely new external façade and roof, new high-performance windows and doors and mechanical heat recovery ventilation. The retrofit is predicted to achieve up to 85% savings on heating bills on a block of six low-rise flats and is aiming for EnerPHit certification. The aim of this pilot project is to prove the success of the approach in order that it can be taken forward to market in a large-scale roll out.

Ongoing monitoring of energy usage, temperature and indoor air quality in the flats has been underway for the past year – carried out by Coventry University – and will continue into the post-occupancy phase in order to assess the actual impact on energy consumption and comfort.

The OWLS retrofit solution can regenerate existing housing stock to nearly zero carbon, eradicate fuel poverty and regenerate local communities through skills development and employment. The innovative system provides an all-in-one solution to minimise thermal bridging and meet the EnerPHit standard.


  • Registration & refreshments
  • Introduction to the OWLS project
  • The OWLS Build System
  • Q&A
  • Site visit 



To book, visit

You are advised to bring your own PPE (including steel capped footwear) for the site visit. Please inform Archie Corliss by emailing in advance in case you are unable to do so.

Further information:

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