Buildings that perform.
For developers, contractors and housing bodies across Ireland, the UK and worldwide.
Architects who think in building science. Engineers who value design. For thirty years we’ve made performance the point of the building, then proven it delivers.
Performance isn’t a claim. It’s a number.
We design to ≤15 kWh/m²a space-heating demand, test airtightness on site at 0.6 ACH at 50Pa, and keep 1,000s of sensors streaming live, so our buildings use 50%+ less energy in use than a standard build.
Free tools, built to the standard.
U-value calculator
Airtightness converter
Fabric heat-loss
Thermal bridge estimator
Learn from the practice that does it.
We’ve trained much of the Passivhaus industry, every course grounded in real projects, taught by the team who wrote Ireland’s national Passive House guidelines.
Would you pass at Passivhaus Designer level?
Twelve exam-level questions. About ten minutes. Your score straight away.
A blower door test on a house reports a mean leakage of 270 m³/h at 50 Pa. The treated floor area is 160 m², the net internal air volume is 400 m³ and the gross heated volume is 620 m³. What is the result?
- n50 is about 1.7 air changes per hour, so it fails badly
- n50 is about 0.44 air changes per hour, so it passes
- n50 is about 0.68 air changes per hour, so it fails the 0.6 limit
- It passes, because the leakage is under 300 m³/h
- Ireland’s Most Sustainable Project 2024, Senan House
- ICE Awards 2026 finalist
- First certified Passivhaus in the English-speaking world, 2004