Passivhaus Affiliate

Old Forge Passivhaus receives certification

Old Forge © Eric Parks, Buckrose Ecological Architects

Old Forge Passivhaus is a private, 3-bedroom dwelling located in the rural village of Wike, North of Leeds. From the beginning, the Client chose to design this replacement dwelling as a Passivhaus.

With a cavity wall construction & trussed roof – this new build is a perfect example of the versatility of the Passivhaus Standard. Overcoming strict planning rules did not compromise the efficiency and comfort provided by building to higher standards while keeping in context with the surrounding area.

Energy Performance



Thermal Energy Demand (≤15kWh/m².yr)


Thermal Energy Load (≤10W/m²)


Primary E Demand (≤120kWh/m².yr)


Still in its first year of occupation, Old Forge Cottage has proven to be an enjoyable and comfortable experience – even with the extraordinarily warm summer.

The Passivhaus experience of the both the architects and the contractors on the project meant that the doors and windows could be from the cost-effective, non-Passivhaus certified Performance range from PHT member Green Building Store. The Green Building Store also designed and commissioned the MVHR system at Old Forge Passivhaus. Local M&E specialists and PHT member LEDA were also part of the design team.

Old Forge, plaque © Eric parks, Buckrose Ecological Architects

Key Stats

Number of Units: 1
Number of Occupants: 1-2
Treated Floor Area: 140m²
Construction: Cavity wall & trussed roof
Project cost: £349,000
Construction Start Date: January 2017
Certification Date: 21 June 2018


Project Owner/Client: Private
Architect: Eric Parks, Buckrose Ecological Architects
Consultants: Leeds Environmental Design Associates

Certifier: WARM
Structural Engineer: Richard Renier
Contractor: I & C Watts

Old Forge, side © Eric parks, Buckrose Ecological Architects


One challenge for the project was to achieve Passivhaus within the limiting planning restrictions on the external appearance. Larger windows were out of the question, so the smaller areas of glazing and increased length of window frames / mullions meant lower solar gains and slightly more heat loss. This was balanced by a combination of increased levels of insulation in the roof and internally insulating the outward opening window frames.”  

Project owner


Achieving certfication in June 2018, Old Forge was one of the three projects helping us to reach the 1000 UK Passivhaus units mark this year. You can explore this project first hand when it opens its doors on 9th and 10th November 2018, as part of the International Passivhaus Open Days. Book your place now!


Further Information

UK Passivhaus reaches 1000

International Passivhaus Open Days site visits

Images © Eric Parks, Buckrose Ecological Architects.

9th October 2018

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