Haycon is a Boston construction and design build firm that specializes high-performance and Passive House building. The company was founded over 10 years ago by Patrick Haydon and David Bemiss, two Boston architects with passion for, and interest in, the building delivery process.

Our broad scope of services include: preconstruction, construction management, design-assist, construction, and general contracting. 

Our diverse portfolio consists of single family and multifamily luxury residential developments, commercial retrofits, passive houses, and smaller restoration/ renovation projects. However, we’re placing our current focus on midsize luxury multifamily developments and passive houses.


Haycon’s approach to guiding the design and entitlement process is such that critical information for permitting, scheduling, and cost is prioritized. We make sure to eliminate unnecessary soft costs and planning efforts in order to produce high-quality finished products in a timely manner.

Haycon provides clients with a sma‍‍‍ll company experience while maintaining levels of professionalism and project accounting found in large companies. In doing so, we are able to provide our clients with an extremely smooth building experience.

Photo of Haycon Founders and Passive House building enthusiasts, David Bemiss and Patrick Haydon
Haycon Founders: Patrick Haydon & David Bemiss​


Haycon has committed to passive house design and construction. About 39% of all carbon dioxide emissions in the US can be attributed to the building sector. We’d like to reduce that statistic by reducing our carbon footprint and using more sustainable building practices. It is our goal to create spaces that improve the health and well-being of those who inhabit them.

Historically, Haycon has employed a variety of high-performance building techniques that increase energy efficiency. However, we realized that more could be done to maximize the energy efficiency of our projects. Through much research and exploration, we determined that Passive House building is the best way for us to do that.  Going forward, our Boston construction projects will be designed, built, and certified according to stringent PHIUS passive building certification standards. 

The National Preservation Awards, presented annually at the PastForward Conference, are bestowed on distinguished individuals, nonprofit organizations, public agencies and corporations whose skill and determination have given new meaning to their communities through preservation of our architectural and cultural heritage. These efforts include citizen attempts to save and maintain important landmarks; companies and craftsmen whose work restores the richness of the past; the vision of public officials who support preservation projects and legislation in their communities; and educators and journalists who help Americans understand the value of preservation.‍‍‍

Haycon is proud to volunteer for and support Youthbuild. There are at least 2.3 million low-income 16 – 24-year-olds in the United States who are neither in school nor employed.  Globally, over 200 million youth are working poor and earning less than $2.00 a day. All are in urgent need of pathways to jobs, education, entrepreneurship, and other opportunities leading to productive and contributing livelihoods. YouthBuild programs provide those pathways by unleashing the positive energy of low-income young people to rebuild their communities and their lives, breaking the cycle of poverty with a commitment to work, education, community, and family.