Compare the highest-rated insulation professionals in Portsmouth, New Hampshire. All contractors are licensed, insured, and verified through our rigorous screening process.
A leading energy efficiency and insulation contractor for the Seacoast region. They are a Building Performance Institute (BPI) Gold Certified Contractor and focus on whole-home solutions that include advanced air sealing and insulation upgrades to maximize comfort and reduce energy bills.
A dedicated insulation contractor known for high-quality residential and commercial work. They offer a wide range of insulation types and are well-versed in both new construction and retrofit projects for existing homes in the Portsmouth area.
A local provider specializing in all forms of insulation installation and removal. They are recognized for their customer service and expertise in tackling difficult projects in Portsmouth's historic and modern homes, including insulation removal and replacement.
The insulation and home performance market in Portsmouth, NH, is characterized by high-quality, specialized contractors rather than a high volume of competitors. Due to Portsmouth's mix of historic colonial homes and modern builds, as well as the city's stringent energy codes and coastal climate, the top providers are those with deep expertise in air sealing, moisture management, and energy audits. The competition level is moderate, with a focus on quality and comprehensive home performance over low-cost, basic installation. Typical pricing is at a premium compared to national averages, reflecting the high skill level, specialized materials (like spray foam), and the cost of operating in the region. Homeowners can expect to pay between $1,500 - $4,500 for a standard attic air sealing and blown-in cellulose job, while full-home spray foam installations can range from $8,000 to $20,000+. Most top-tier contractors are well-versed in local utility rebates from providers like Eversource and New Hampshire Saves, which can significantly offset project costs.
4.7+ star average from verified customer reviews
All contractors are properly licensed and insured
10+ years average experience in the industry
Familiar with Portsmouth regulations and climate
Get answers to common questions about insulation services in Portsmouth, New Hampshire.
For Portsmouth's historic homes, a combination approach is often best. Closed-cell spray foam is excellent for sealing irregular framing in attics and rim joists, providing a high R-value and moisture barrier crucial for our coastal humidity. For easier-to-access areas like attics, dense-pack cellulose is a cost-effective choice that also manages moisture well. A professional assessment is key, as many local homes have unique construction features that require tailored solutions.
Costs in the Seacoast region vary widely based on home size, insulation type, and accessibility. For a standard attic project using cellulose or fiberglass batts, homeowners can expect $1,500 to $3,500. More comprehensive whole-house air sealing and insulation with materials like spray foam can range from $5,000 to $15,000+. It's important to factor in potential rebates from New Hampshire's NHSaves program, which can significantly offset the initial investment.
Late spring through early fall (May to October) is generally ideal, as attics and crawlspaces are less extreme to work in and your home's heating system isn't yet critical. However, scheduling can be competitive during these months. Many reputable local contractors work year-round, and winter projects are feasible, especially for interior areas like basements. Planning ahead is advised to secure a spot before the peak heating season begins.
Generally, basic insulation retrofits do not require a permit from the City of Portsmouth. However, if the project involves altering the structure, accessing closed walls, or modifying electrical/plumbing systems, a building permit may be necessary. Crucially, any work on homes in the Historic District may require approval from the Historic District Commission. Always verify with your contractor that they are familiar with and will comply with all local codes and guidelines.
Common local signs include drafty rooms (especially noticeable during nor'easters), ice dams forming on the roof in winter, significant temperature differences between floors, and excessively high heating bills compared to similar-sized neighbors. A professional energy audit, often available through NHSaves, is the best first step. This will use tools like a blower door test to pinpoint air leaks and thermal imaging to show exactly where your insulation is failing.