EnerPHit Rebuild – Donnybrook, Dublin 4


Clients: Peter & Sarah Donnelly

Architect: Alan Burns, Bright Designs Architects

Engineer/PHPP: Archie O’Donnell

Media: Featured in Passive House + Magazine

EnerPHit Logo for certified construction projects


This project was a deep renovation and extension of a 1960’s Donnybrook property to become a spacious (367m2), modern family home over three floors. This project was only the second building in Ireland to achieve certification to EnerPhit standard.

External insulation was used to wrap the building and achieve a cold bridge free building envelope. Heat recovery ventilation, solar thermal panels and a rain water harvester were installed. Airtightness test result of 0.6ACH surpassed the EnerPhit target of 1.0ACH and achieved the passive standard, an exceptional result for a project of this type.

The client specified a requirement for underfloor heating and at the time of writing it had been used only twice in 2 years, for 2-3 hours when external doors were left open for extended periods of time.

This involves detailed pre-construction planning crucial to successful construction and on-time delivery, and allows the client and team a clear pathway to the bidding process, construction phase, and through to completion.



  • Airtightness Test result: 0.6ACH
  • Heat Recovery: Dantherm, HCV3 (2 No.) Dantherm HCH5 Heat Recovery Units, with summer bypass, 77% efficiency HRE including air duct losses
  • U-Values: Foundations – 0.131 W/(m²K), Roof – 0.115 W/(m²K), Exterior Walls – 0.171 W/(m²K)
  • Windows & Glazing: HolzPlus timber aluclad windows and doors, U-value 1.3 W/(m²K) and Triple-glazing with warm edge swiss spacers, U-value = 0.6 W/(m²K)
  • International Passive House Database Ref: 3835
  • BER: A3