Sustainable Building

Our Portfolio

Sustainable Building

We are committed to sustainable “green” building. In 2011, we collaborated with Peabody Architects to build the first “Passive House” in the Washington Metropolitan Area and the 22nd in the United States. Since then we have completed the first modular passive home in the Metro area, the first Passive House in Rockville, MD and a Zero Energy ready home in Fairfax City, VA.

Passive House

Logo: Passive House Institute USO’Neill Development, along with Architect David Peabody, have designed and built the first “Passive House” in the Washington Metropolitan area (and the 22nd in this country) as well as the first modular passive house in this area. “Passive” construction involves a super insulated structure with constantly re-circulating fresh air and even temperatures throughout. A PH home uses roughly 90% less heating and cooling energy than the average home. It is designed as an integrated system, with site, energy, ventilation, air quality, humidity, health and comfort all taken into account. The images that follow are examples of our passive house construction.

The Chelsea House

This passive house was the first passive house built in the Washington Metropolitan Region and one of the early passive houses built in the United States.

Read more about our Chelsea House Passive House here.

Chelsea House article


The Hip House

This passive house was built for the Housing Initiative Partnerships of Prince Georges County for their affordable housing initiative and the first modular passive built in the Washington Metropolitan region.


Rockville City Passive House

This Passive House, completed in 2014, was the first of its kind in Rockville. Designed in the neoclassical style of the twentieth century, this house won the Peerless Rockville award in two categories: Outstanding Green Design and Compatible Infill.

Net Zero Ready

Fairfax City

This house was designed by architect David Peabody using passive house principals but the owners chose not to make it PHIUS certified.  Eventually owners will be installing a 20 kw solar array to power both the house and one electric vehicle.