The demonstration in Roosendaal, the Netherlands, consists of 70 identical, single family terrace houses build in 1960 in the area of Kroeven. The full upgrade of the Kroeven area consists of 370 houses, of which 246 will be renovated and 112 units will be newly constructed, replacing about 100 existing houses. The retrofit of the 70 houses that are part of the E2ReBuild project were completed at the beginning of 2011. The houses are owned by social housing company Aramis AlleeWonen.


Retrofit concept

The renovation in the Roosendaal pilot buildings took place with the tenants remaing in their homes through the whole renovation work. This required both a fast and non-intrusive renovation process and a continous dialouge between the housing company, Aramis AlleeWonen and the tenants. When the discussion of an upgrade of the Kroeven area started it was soon realised that both the owner and the tenats were interested in the passiv house concept for renovation. Two different approches for energy efficient renovation were tested:

Approach 1 resulted in two test houses, demonstrating how the houses can be insulated using 200 mm external EPS insulation and a plastered facade, passive house window frames and triple glazing, and prefabricated timber roof elements, filled with 350 mm cellulose insulation. From 2010 to 2012 this approach will be implemented in 112 houses.

Approach 2 resulted in one test house demonstrating how the houses can be insulated using a new 350 mm timber frame element with cellulose insulation, with triple glazed passive house window frames, and again prefabricated timber roof elements, filled with 350 mm insulation. The external façade cladding is natural slates. From 2010 to 2012 this approach will be implemented in 134 houses, including the 70 E2ReBuild pilot houses.

In both approaches the heating, ventilation and domestic hot water system would be upgraded using new compact systems, which include a mechanical heat recovery system, a 200/150 l storage tank connected to a solar collector array, with a backup by a small condensing gas boiler.


Terrace houses in De Kroeven before and after retrofit

Houses in Roosendaal, before (left) and after (right) retrofit.
Photo: Chiel Boonstra/Trecodome


Brief facts

Year of construction: 1960

Property type: Single family, terrace houses

No. of dwellings: 70

Project owner: Aramis Allee Wonen, public housing company

Energy (heat) demand befor retrofit: 150 kWh/m²y

Estimated energy demand after retrofit: 25 kWh/m²y

Construction works: Completed, spring 2011


Participating E2ReBuild partners: Trecodome, Aramis AlleWonen

Demonstration leader: Chiel Boonstra, Trecodome,


First demonstration buildings in Kroeven completed and celebrated

(May 2011)
On Saturday 14 May 2011, the completion of the first phase of passive house renovations in the residential area of Kroeven, Roosendaal, was officially celebrated.


Integration of renovation and new construction in Roosendaal

(June 2012)

The project Kroeven in Roosendaal included the renovation of 70% of the houses, whereas 30% has been demolished and replaced with new, and different house types.



Roosendaal: 67% lower gas bills for space heating, hot water and cooking

(June 2013)

Tenants in the E2ReBuild demonstration building in Roosendaal enjoy a 67% lower gas bill than before due to the passive house energy renovation. Monitored energy figures for identical houses in the area, renovated to current standard, show only an 18% reduction.



National seminar

(December 2013)

On 10 December 2013 Alleewonen, Woonbond and Trecodome arranged a national seminar titled: Symposium Passiefhuisrenovatie Kroeven, in Roosendaal. The seminar addressed an audience of 140 building professionals, architects and representatives of housing associations and tenant and supply industry.

Passiefhuis renovatie De Kroeven Roosendaal, by Ad van Reekum, AlleeWonen

Bewonersparticipatie by Jos Aal, Adviseur Woonbond Kennis

Monitoring Kroeven, Roosendaal by Chiel Boonstra, Trecodome



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