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PCKO's £3.5m Passivhaus scheme starts on site

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[FIRST LOOK + PLANS + PROJECT DATA] Work has started on this £3.5 million passivhaus housing scheme in Sussex by PCKO Architects

The 2,000m² scheme is made up of 26 affordable homes which will be built with a brick-clad, timber-frame system.

PCKO director Paul Webb said the materials were chosen to make Passivhaus construction accessible to typical builders, using traditional detailing techniques.

The development is being built for Hastoe Housing Association, who has already completed a number of Passivhaus housing schemes.

The scheme has been designed to provide homes for local residents who would otherwise be priced out of the local housing market.

PCKO is working on another Passivhaus housing scheme on the Isle of Wight. Both projects are set to complete in spring 2015.

PCKO Passivhaus

The architect’s view

‘The masterplan was developed based on detailed studies of the surrounding context and is appropriate for its rural setting. Houses no more than two storeys in height are arranged in clusters within semi-private courtyards. This careful composition allows each dwelling to have a street entrance which makes the street more active and improves legibility. As a contemporary interpretation of the architectural vernacular of West Sussex we have chosen to use brick as the predominant material, rather than render that is usually used on Passivhaus developments. 

‘We have gone beyond the benchmark sustainability assessment of Code for Sustainable Homes and sought further environmental improvements by designing to Passivhaus standards.  This will be achieved by providing a building envelope with excellent thermal performance as well as extreme air tightness to eliminate the loss of heat through the building fabric and leaky junctions. 

‘The simple forms of the houses not only complement the local vernacular but minimise the external wall area, reducing the heat loss from walls and roofs. Facades have been particularly carefully designed with each window detailed to ensure maximum solar gain can be achieved whilst avoiding over-heating.’ 

PCKO Passivhaus

Project data

Location Crawley Down, Sussex
Type of project residential  
Client Hastoe Housing Association
Architect PCKO Architects
Passivhaus consultant WARM Consultants
Landscape architects Garden House Design
Employers agent Sweett Group
Aboricultural consultant Broad Oak
Transport consultant Motion
Structural engineer Rushby Brewster
Civil engineer AMA
Mechanical engineer Aaron Tilley
Electrical engineer Graham Wiggins
Acoustic engineer Ian Sharland Limited
Quantity surveyor Sweett Group
Main contractor PMC Construction
Funding HCA (deadline March 2015)
Tender date June 2013
Start on site date Jan 2014
Completion date Mar 2015
Contract duration 64 weeks
Gross internal floor area approximately 2,000m²
Form of contract and/or procurement Design & Build
Total cost £3.5 million
Cost £1,450/m²
Predicted air tightness levels 0.6ACH @ 50PA
Heating energy demand less than 15kWh/m²yr
Primary energy demand less than 120kWh/m²hr
Specific environmental targets Passivhaus

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