Compare the highest-rated insulation professionals in Seattle, Washington. All contractors are licensed, insured, and verified through our rigorous screening process.
A well-established, family-owned company known for its comprehensive insulation and air sealing services. They are frequently recommended for energy efficiency upgrades and are recognized for their professionalism and expertise in handling both residential and commercial projects. They often assist customers with local utility rebate programs.
Specializes in high-performance building envelope solutions with a strong focus on building science. They are a top choice for homeowners seeking deep energy retrofits, air sealing, and advanced insulation techniques to meet strict efficiency standards. Their team holds advanced certifications like BPI Building Analyst.
A trusted local contractor offering a wide array of insulation services alongside window installation. They have a strong track record for attic and crawl space projects and are praised for their clear communication and quality workmanship. They are knowledgeable about Seattle's specific climate challenges and building codes.
The insulation market in Seattle is robust and highly competitive, driven by the city's cool, damp climate, high energy costs, and a strong cultural emphasis on sustainability and energy efficiency. The average quality of service is high, with leading contractors well-versed in modern building science principles, including the critical integration of air sealing with insulation. Competition is fierce among top-tier providers, which benefits consumers through competitive pricing and a focus on customer service. Typical pricing varies significantly based on the project scope and material; a basic attic blow-in with cellulose can range from $1,500 to $3,000, while a full attic encapsulation with spray foam and air sealing can cost $8,000 to $15,000 or more. Homeowners should always verify a contractor's license with the Washington State Department of Labor & Industries and inquire about available rebates from local utilities like Seattle City Light and Puget Sound Energy, which many of the top providers are experienced in navigating.
4.7+ star average from verified customer reviews
All contractors are properly licensed and insured
10+ years average experience in the industry
Familiar with Seattle regulations and climate
Get answers to common questions about insulation services in Seattle, Washington.
For Seattle's cool, damp climate with mild winters, the top priorities are attic insulation and air sealing to prevent heat loss and moisture intrusion. Blown-in cellulose or fiberglass in the attic to meet or exceed Washington State's recommended R-49 level is crucial. Also, insulating crawl spaces and basement rim joists is key to combat ground moisture and drafts, which are common in our region.
Costs vary by home size and scope, but a full attic insulation upgrade for a typical 1,500 sq ft Seattle home often ranges from $1,800 to $3,500. Critically, Seattle City Light and other local utilities offer significant rebates for insulation improvements, and Washington State sales tax is waived on eligible energy-efficient insulation materials and labor, making projects more affordable.
The ideal time is late spring through early fall (May-September) when weather is drier, allowing for proper attic and crawl space ventilation during installation. Most single-area projects like an attic or crawl space are completed in one day. Scheduling ahead before the rainy season and winter rush is highly recommended to secure timely service.
Always verify the contractor is a Registered Specialty Contractor in Washington State with an "Insulation (06)" endorsement. Choose a local provider experienced with Seattle's building codes and moisture management, and ask for proof of liability insurance. Reputable contractors will also perform a pre-installation energy assessment and can help you navigate local utility rebate paperwork.
Not entirely. In Seattle's older homes, air sealing is just as important as adding insulation. Gaps, cracks, and penetrations in the building envelope must be sealed first to stop drafts and prevent moist indoor air from condensing inside walls, which can lead to mold. A professional assessment will identify these leakage points, and a comprehensive approach combining air sealing with insulation is the effective solution.