The Thamesmead demonstration is a linear block of maisonette style dwelling accommodation, built in 1974 and located in South East London, UK. The building has a concrete frame construction with a mixture of concrete and PVC-U façade panels with non-standard cavity brick infill to some portals. The roof is of flat construction using a timber cold deck with 3 layer mineral felt covering. The concrete panels are of non-cavity type construction and therefore cannot be insulated by conventional means.


Retrofit concept

Due to the degree of cold bridging and the complex nature of the construction type an external insulation solution is required. The preferred building envelope refurbishment technology is to use prefabricated, highly insulated façade and roof elements. This will reduce disturbances to tenants and deliver project speed gains on site. It is hoped that the prefabricated methodology will allow for simplified extensions to the existing building with the inclusion of a new upper storey constructed off-site using these prefabricated elements and craned into position.



Thamesmead demonstration building befor retrofit


Model of the finished E2ReBuild demonstration on Maranway, in Thamesmead 


Brief facts

Year of construction: 1974

Property type: Multi-storey building

No. of dwellings:

Project owner: Gallions Housing, private housing company

Energy (heat) demand befor retrofit: 237 kWh/m²y

Estimated energy demand after retrofit: Retrofit Passivhaus Standard (<25 kWh/m²y)

Construction works: March 2013-March 2014

Participating E2ReBuild partners: Trecodome, Gallions Housing Association, Gumpp&Meier, Technische Universität München

Demonstration leader: Chiel Boonstra, Trecodome,


The floorplans of the London/Thamesmead demo

Ground, first and second floor

Third and fourth floor and North-South section

South-North and East-West elevation


Sustainable development in a broader sense in Thamesmead

(June 2013)

The creation of added value for the tenants is a key aim of the E2ReBuild project. In Thamesmead, in the south of London, where refurbishment of the E2ReBuild demonstration building is just about to start, added social value is a major objective for the owners – Gallions Housing Association.  


National seminar

(October 2013)

A national seminar in regards of the London/Thamesmead demonstration was held at the UK Passive House conference on 15 October, 2013. The title of the seminar was: Parkview Hub – a social housing retrofit to EnerPHit standards using prefabricated timber and the seminar adressed an audience of 200 building professionals, energy consultants, manufacturers and representatives from universities, housing associations etc.


E2ReBuild – Industrialised energy efficient retrofitting of residential buildings in cold climates. Contact