Residential Contracting & Speciality Services

Our General Contracting division specializes in addressing the most common problems we identify during building inspections. 80% of the environmental problems we find arise because of the same 10-20 building deficiencies. Below is a list of the most common projects we tackle for residential and light-commercial buildings. Our general contractor service area is the San Francisco Bay, with most projects landing in Marin, Sonoma and San Francisco.

Many common building problems are the result of deferred maintenance. Our sister company, Home Stewards provides a unique quarterly subscription program to help maintain buildings in the North Bay. Please give them a visit if you are interested in subscription home maintenance.

Site Drainage

French Drains, Sump Pumps, Gutters & Downspouts

Water around a home can cause significant damages including pest infestations, dry rot and mold. Keeping water away from wood and foundation is key to avoiding enormous long-term expenses. Let us help you install better drainage solutions.

RF / EMF Mitigation

Shielding for Magnetic Fields & RF, and Fixing Wiring Errors

Full-service electromagnetic field (EMF) radiation. Be it installing custom magnetic field shielding materials, hanging RF-shielding window films and special shielding paints, or tracing down and repairing wiring errors, we are a one-stop shop for professional EMF mitigation.

Crawlspace & Vapor Barrier

Bad smell down below? Debris and moisture under your home?

We offer major improvements to crawlspaces including cleaning out debris, creating drainage systems and better lighting for future inspections, and professional installation of heavy duty vapor barrier systems.


Stuffy House? Not Recharged in the Morning?

Very few homes have adequate ventilation. This presents itself in many ways, most often through condensation problems and build up of odors and carbon dioxide. We help specify and install balanced ventilation systems [Heat Recovery Ventilators (HRVs) and (Energy Recovery Ventilators (ERVs)] for the whole-house, or high-use rooms.

Water Filtration

Funky Tasting Water? High Blood-Lead Levels?

We can help determine the source(s) of contamination and develop a customized water filtration system tailored to remove what is present in your home or apartment. Filtration may include activated carbon and other absorptive materials, and media and Reverse Osmosis (RO) systems. Finding the right filter is imperative.

Home Hardening for Fire

Hardening your home for a fire protection.

There is no such thing as a fire-proof home, but there are many simple measures you can take to actively reduce risks of fire damage. Installing fire-resistant vents and gutter guards and pulling vegetation away from your home are good first steps. Installing exterior sprinklers and hardening your roof and siding materials are more advanced and involved strategies to reduce risk of fire loss.

Air Sealing

Energy Efficiency & Improved Air Quality

Air sealing is a no-brainer. It's relatively inexpensive compared to the large returns provided in energy efficiency, thermal comfort, and improved indoor air quality. It take a meticulous contractor to properly air seal a home using specialty sealants, caulks, foams and construction tapes. It's detailed work that can make a big impact. Let our team air seal your home and feel the difference.


Kitchens, Baths, Decks & Expansions

As professional general contractors we build from the ground up and remodel. Let us know your plans and we can help as much or as little as necessary. We have designers and professional subcontractors in the wings and we're ready to help see your home remodeling projects to fruition.

Water Damage Restoration

Previous Water Damage or Flooding?

We are well-versed in the best practices of identifying and remediating water-damaged materials. First we must identify the extent of damages and remove irreparable materials, then deep-clean and dry, and finally rebuild.

Residential General Contracting for San Francisco Bay Area

Healthy Building Science started as an industrial hygiene (or environmental testing) company. In that line of work we saw much damage due to deferred maintenance, poor waterproofing details, and generally bad design and construction detailing. We became experts in forensic investigations and now we bring a unique perspective to residential construction.

We consider long-term durability, environmental impacts, and maintenance requirements for every project. Whether we're installing a new roof and flashing new doors or windows, laying down a new vapor barrier, or installing new air and water filtration, or team is uniquely suited to provide long-term and durable solutions for any residential project.

Our service are for general contracting is smaller than our industrial hygiene. We focus on residential structures (and light commercial) and primarily work in Marin and Sonoma Counties in the North Bay. We often bend the rules and travel further for inspection clients or repeat clients, but in general our construction services are focused in the following cities: Mill Valley, Sausalito, Marin City, Corte Madera, Fairfax, San Anselmo, San Rafael, Tiburon, Belvedere, Novato, Petaluma, Santa Rosa, Cotati and Sebastapol.