GREENWOOD HOUSE Passive House case study in Co. Cavan

The site sits near Cootehill, a historic market town in County Cavan known for its wide streets, rich linen-making heritage, and surrounding lakelands. We followed a landscape-led design approach, shaping the dwelling's form and materials to visually integrate with the site and its setting.

Key figures:

· GIA: 151m² / 1,625 ft²

· TFA: 141m² / 1,515 ft²

· Form factor: 2.94

· Space Heating Demand: 15 kWh/(m²a) - Passive House Classic

· Heating Load: 11 W/m² - Passive House Classic

· Renewables: heat pump (domestic hot water) + roof-mounted solar PV on the adjoining garage

Greenwood House achieves Passive House Classic certification through a high-performing building envelope, triple-glazed windows, mechanical ventilation with heat recovery (MVHR), thermal-bridge-free construction, and a rigorous airtightness strategy.

In doing so, it comfortably exceeds Part L of the Republic of Ireland's Building Regulations - including Nearly Zero Energy Building (nZEB) requirements - proving that outstanding energy performance and quiet, elegant design can go hand in hand.