Canolfan Hyddgen

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Canolfan Hyddgen - built in 2008 & occupied in January 2009 - is the UKs 1st certified Passivhaus office building located in Machynlleth, Wales. As a BREEAM excellent Multi-occupancy building with over 15 tenants it provides Bi lingual IT provision for the adjacent school, night classes, adult learning, meeting rooms, drop-in centre and council service point. JPW led the design team and partnered with the Client to satisfy a brief which demanded a building which could maximise revenue through flexible/continous use and minimise running costs via energy efficiency to create a environmentally & financially sustainable facility. Consultation with stakeholders at the earliest opportunity embedded a passivhaus approach into a design focused on local natural aesthetics & materials. On going monitoring, regular servicing and induction of building users has enabled continual reduction of energy consumption below predicted for the last 4 years.
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Canolfan Hyddgen : Project images

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CO2 emissionsPrimary energy requirement
Energy target

Energy and fuel use

Fuel use by type
Primary energy requirement
CO2 emissions

Measured data from renewable generation is not yet available.

Fuel use

Electricity use - - -
Natural gas use- - -
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
Primary energy requirement - - -
Annual CO₂ emissions - - -
Annual space heat demand - - -

Renewable energy

Electricity generationForecastMeasured
Renewables Technology--
Other Renewables Tech--
Electricity consumed by generation --
Primary energy requirement
offset by renewable generation
Annual CO₂ emissions
offset by renewable generation

Calculation and targets

Whole house energy calculation method
Other whole house calculation method-
Energy target PassivHaus
Other energy targets-
Forecast heating load -


Pre-development air permeability test--
Final air permeability test--

Project description

Start date
Occupation date01 January 2009
Location Machynlleth Powys  Wales
Build typeNew build
Building sectorCommercial
Property typeDetached
Construction typeOther
Other construction typeExternal Timber Frame Envelope
Party wall construction
Floor area 410
Floor area calculation method Treated Floor Area (PHPP)
Building certification  Passivhaus certified building Passivhaus certified building

Project Team

OrganisationJPW Construction
Project lead personJohn Williamson
Landlord or ClientPowys County Council
ArchitectJPW Construction
Mechanical & electrical consultant
Energy consultant
Structural engineer
Quantity surveyor
ConsultantJPW Construction
ContractorC. Sneade

Design strategies

Planned occupancy
Space heating strategy
Water heating strategy
Fuel strategy
Renewable energy strategy
Passive Solar strategy
Space cooling strategy
Daylighting strategy
Ventilation strategy
Airtightness strategy
Strategy for minimising thermal bridges
Modelling strategy
Insulation strategy
Other relevant retrofit strategies
Contextual information

Building services

Space heating
Hot water
Renewable energy generation system
Strategy for minimising thermal bridges

Building construction

Volume -
Thermal fabric area -
Roof description
Roof U-value -
Walls description
Walls U-value -
Party walls description
Party walls U-value -
Floor description
Floor U-value -
Glazed doors description
Glazed doors U-value - -
Opaque doors description
Opaque doors U-value - -
Windows description
Windows U-value - -
Windows energy transmittance (G-value) -
Windows light transmittance -
Rooflights description
Rooflights light transmittance -
Rooflights U-value -