Passive House

About Viking House

Viking House US specializes in the design and construction of passive zero and low-energy buildings.

Viking House US Founder Adam Cohen has spent 28 years working on “alternative” construction. He has designed and built earth sheltered, ferro cement, ICF (insulated concrete forms), SIP (structural insulated panels), timber frame and 100% recycled as well as standard construction. He has over 25 years’ experience incorporating solar thermal, radiant heat, photovoltaic (PV) and wind into his projects.

Seamus O’Loughlin , the original Viking House Ireland founder, has spent the past 8 years innovating with passive design, construction and products on over 40 passive new-build and retrofit projects across Ireland. Seamus and Adam have been collaborating on US Passive House Design and Construction and it was Seamus that encouraged Adam to start Viking House US.

Viking House US was established in 2010 as an atelier between Viking House Ireland, Viking House UK and Structures Design/Build’s Passiv Structures division to bring the expertise and experience of the European Viking House to the United States. Structures Design/Build is a leader in the US Passive House Community, having completed the first US Passive House Public School Project,The Center for Energy Efficient Design (CEED).

Passiv Structures has developed a system of Passive House Construction that can be built at cost parity with standard construction.

Passive House

How can we help?

Viking House US has expertise in design and construction of passive buildings.

If this is your first passive building, whether as a designer, builder or client, you are likely to need some guidance and support. Although design and construction of passive building is fundamentally simple, there are pitfalls as well as the potential for unnecessary cost.

Through our own experiences we have develop a meticulous eye for detail necessary to avoid future defects and to attain the best passive building experience.

Viking House US offers a wide range of consultancy, training, technical support and monitoring from inception to completion and after. See ‘Services’ for more detail.

Viking House UK

Viking House Ireland

Passive House Passive House Passive House Passive House Passive House



Our Vision

Our vision is to promote healthier, happier and secure lives through healthier, lower-energy buildings.

Our Mission

Our mission is:

  • to de-mystify passive design and construction
  • to share our knowledge and experience with everyone
  • to keep learning from others


Viking House Ireland News

A recent retrofit project has just been awarded the first A1 BER rating in Ireland (similar to UK Energy Performance Certificate).. Another project has just been short-listed as one of ten of the greenest buildings in Ireland over past year. Viking House has a team of Accredited European Passive House Designers and is supported by eminent researchers including Professor Jon Kristinsson, Architect/Engineer, designer of one of the earliest passive houses in the 1970’s.