Is the Air in Your Home Safe and Healthy to Breathe ?

Introducing Indoor Air Quality Solutions by BESC

  • Healthy

    Healthy indoor air is very difficult to achieve in homes and buildings. Filtration, disinfection, and comfort must be designed and built into a healthy home or any building carefully and holistically. Start the conversation with climate and end it with comfort and process. In between, talk about the floors, walls, and roof, and what makes you comfortable and productive – the temperature, the humidity, air flow, and lighting. And, these days, find out how we take care of viruses, allergens, molds, and other particles.

  • Quality

  • Efficient

    At BESC, we have the equipment and expertise to determine your current energy expenditures.

  • Economical

    Quality homes pay down the cost of improvements above standards in energy and water savings, and then keep their value AND command a premium above standard homes upon resale. 

Our Licenses

CA Civil PE#48614
CA Mechanical PE#33457
CA General Building Contractor #845771
C-20 HVAC (Pending, October 2020) 

Our Certifications

Certified Energy Analyst (CABEC) #R16-19-20171
Certified Energy Manager (AEE) #24744  
Home Energy Rating System (CalCERTS) 
EPA Indoor AirPLUS 


Since 1985, BESC President Tim Twomey, PE, has been involved in multiple facets of the building industry. With a longstanding interest in energy and the environment, Tim’s eyes were opened to the fragmented nature of construction and its effect on the final product. He witnessed many inefficiencies in the design and building process, often due to the large number of designers, consultants, and contractors required to complete a build. In a standard construction project, each consultant and contractor are “compartmentalized” and perform their parts in the building operation as quickly and inexpensively as possible, resulting in deficiencies in the overall performance of the completed structure.

BESC is different. We provide integrated solutions for healthy and efficient homes. Our years of practical field experience informs design for easy maintenance. We offer full-service civil and mechanical engineering. We build and retrofit high-performance healthy efficient homes, from design and energy modeling to proper construction, to meet the highest indoor air quality, thermal comfort and energy efficiency performance expectations.

What we do

Streamline Your Build and Improve Efficiency

Avoid the performance and efficiency flaws typical in today’s standard construction process with BESC high-performance design and construction. Whether you are a home or business owner overwhelmed with the number of contractors necessary to achieve a successful build, or a construction manager looking to simplify and perfect your high-performance construction process, BESC High Performance Building Design can help you accomplish a more streamlined, cohesive build, maximizing the performance of your high-efficiency structure.

Take Your Building Results to a Higher Level

Using a more holistic, results-oriented building process, BESC safeguards the end-performance of your structure, netting you an abundant return. Strategically designed and carefully constructed with the help of our team of specially selected building partners, BESC-built designs possess a better thermal envelope, requiring far smaller, less expensive HVAC and water heating equipment. This results in lower construction costs and a lifetime of energy savings.

Save Annually with a BESC High-Performance Build

Every BESC construction project ensures customer satisfaction. Carefully tested with specialized equipment, we verify results. Our customers enjoy improved comfort and dramatically reduced energy expenditures over the life of the building. We are so confident in our superior building process, we can calculate and guarantee your monthly energy savings based on your building design.

Calculate The Savings

Discover how much you could save annually with a BESC high-performance build.

Get guaranteed performance. Start off on the right foot with the help of BESC High Performance Building Design. Browse our website and learn more about our comprehensive process, or contact us at 707-397-1487 today.


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High-quality energy efficient home construction and rebuilding, especially in fire damaged Northern California.

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