Compare the highest-rated insulation professionals in Londonderry, New Hampshire. All contractors are licensed, insured, and verified through our rigorous screening process.
A family-owned and operated insulation specialist based directly in Londonderry. They are highly focused on energy efficiency upgrades, offering a comprehensive suite of services from audits to installation. Their strengths include deep knowledge of local building codes and available rebate programs, particularly for National Grid NH customers.
A premier, long-standing HVAC and home performance company serving Southern NH. While known for heating and cooling, they have a dedicated "Home Performance" division that excels in whole-home energy solutions, including advanced insulation and air sealing. They are a top choice for integrated system approaches.
A dedicated insulation contractor serving the greater Southern NH and Northern MA area. They are a pure-play insulation company, meaning it's their sole focus. They are known for professional service, clean installations, and expertise in both new construction and retrofit projects for existing homes.
** The insulation market in Londonderry and the surrounding Southern New Hampshire region is robust and competitive, characterized by a mix of specialized insulation contractors and full-service home performance companies. The average quality is high, as the climate demands effective insulation for both winter heating and summer cooling efficiency. Homeowners are generally knowledgeable about energy efficiency, driven by high energy costs and available utility rebates from providers like National Grid. **Competition Level:** Moderate to High. While there are a few local specialists, many of the top-rated providers are based in adjacent cities like Derry, Hudson, and Manchester, creating a competitive environment that benefits consumers. **Typical Pricing:** Pricing is influenced by material costs (with spray foam being significantly more expensive than cellulose or fiberglass batts) and project scope. As a general guide: * **Attic Blown-In Cellulose:** $1,500 - $3,500 * **Whole-House Air Sealing:** $500 - $2,000 * **Spray Foam (Open Cell) for Attic:** $3,500 - $7,000+ * **Wall Insulation (Blown-in):** $2,000 - $4,500 Most reputable companies offer free, detailed estimates and can guide homeowners through available rebate programs, which can substantially offset the project cost.
4.7+ star average from verified customer reviews
All contractors are properly licensed and insured
10+ years average experience in the industry
Familiar with Londonderry regulations and climate
Get answers to common questions about insulation services in Londonderry, New Hampshire.
For our climate, air sealing combined with high-performance insulation like spray foam or dense-packed cellulose in walls and attics is most effective. Spray foam provides an excellent air barrier, which is crucial for combating the nor'easters and sub-zero temperatures common in Londonderry, while dense-packed cellulose is a superb choice for retrofitting existing walls due to its ability to fill cavities and reduce air infiltration. The best choice depends on your home's construction, budget, and specific air leakage issues.
Costs vary significantly based on the project scope, but typical whole-house insulation upgrades in the Londonderry area range from $3,000 to $8,000+. Key factors include the insulation material (fiberglass batts are less expensive than spray foam), the square footage and accessibility of your attic and walls, and the extent of necessary air sealing. It's important to note that New Hampshire offers incentives like the NHSaves program, which can provide rebates that substantially offset the cost for qualifying energy-efficient upgrades.
While insulation can be installed year-round, the ideal times are late spring (May-June) and early fall (September-October). These periods typically offer mild, dry weather, which is important for certain materials like spray foam that have specific temperature and humidity application requirements. Scheduling during these shoulder seasons also ensures your home is fully prepared before the peak heating season begins, and you'll find greater contractor availability compared to the busy late summer rush.
Yes, insulation work must comply with the New Hampshire Building Code, which is based on the International Residential Code (IRC) and includes specific R-value requirements for our climate zone (Zone 6). In Londonderry, you will likely need a building permit for any major insulation retrofit, especially if it involves altering the building envelope. Always hire a licensed and insured contractor who is familiar with these local codes and can pull the necessary permits on your behalf.
Look for a contractor with strong local references, proper licensing, and insurance. A reputable provider should offer a comprehensive energy audit or assessment using tools like a blower door test to identify specific air leaks and insulation gaps unique to your home. Be wary of door-to-door sales or extreme low-ball quotes. Instead, seek out established local companies that are participating contractors in the NHSaves program, as this indicates they meet certain standards for quality and energy performance.