Haycon is a Boston construction and design/build firm that specializes in 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 the building delivery process.


Haycon’s broad scope of services include: pre-construction, construction management, design-assist, and general contracting. 

Our diverse portfolio includes: single and multifamily residences, commercial fit-outs, passive houses, and renovation projects. However, we currently prioritize midsize multifamily Passive House projects.


We prioritize vital information for permitting, scheduling, and cost throughout the design and entitlement process. We remove needless soft costs and planning efforts in order to yield high-quality finished builds in a timely manner.

Haycon provides clients with a sma‍‍‍ll company experience while providing levels of expertise and project accounting found in large companies. In doing so, we provide our clients with an extremely smooth building process.

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


Rampant GHG and carbon emissions have caused significant damage to our environment, and now we must work to restore it. The building sector in particular is to blame for about 39% of all carbon emissions in the US. Having been such a large part of the problem, building professionals now have a large role to play in providing solutions. By lowering our emissions, Haycon aims to help the city of Boston reach carbon neutrality by 2050

Energy efficiency has always been one of our top priorities, and our past builds include many energy-saving features. But amid the growing demand for more “green” building practices, we’ve chosen to raise our standards. As a result, several of our team members have taken the necessary steps to become certified Passive House builders and consultants, and we have made the decision to design and build all future projects to meet Passive House certification standards. To learn exactly what this entails, we suggest looking at the Passive House Institute US website.  

Why Passive House?

Passive House performance standards are very high. In order to meet them, we must strive to minimize our buildings’ energy usage and energy loss to the greatest extent possible! Doing so allows us to keep learning and honing our craft so that each new build is better than the last.

By upholding such strict standards, we’re able to create less costly, eco-friendly spaces. We do so in part by: avoiding the use of fossil fuels, creating tightly-sealed enclosure systems, and by using renewable resources, central ERV systems, high performance windows, etc. Such methods, if they’re adopted nationwide, can reduce building sector-related  GHG emissions by 25% from 2005 levels by 2030.

So far, we have one finished Passive House, three under construction, and one in the preconstruction phase. Make sure to follow our social media accounts for frequent updates on these projects!


The National Preservation Awards are given to people and entities whose skill and determination have given new meaning to their communities through preservation of our architectural and cultural heritage. 

Utile and Haycon's entry for the Triple Decker Challenge won runner-up! We had a great time working with our friends at Utile on cost projections and practical high performance details. We are thrilled at this outcome and would like to thank everyone who voted!


We are proud to support YouthBuild.  YouthBuild programs uplift low-income young people by helping them rebuild their communities. Their programs provide pathways to jobs, education, and other opportunities that can lead to fruitful lives.