Spray Foam Insulation in Portsmouth, NH

Find top-rated spray foam contractors and save up to 37% on energy bills

Compare 8 verified spray foam insulation contractors serving Portsmouth, New Hampshire, backed by 360 customer reviews averaging 4.3★. Whether you're insulating a new build, retrofitting an existing home, or upgrading attic and crawl-space insulation, these pre-screened Portsmouth contractors handle both open-cell and closed-cell spray foam. Homeowners here typically cut energy bills by around 37% — get free quotes and read verified reviews below.

💰 Spray Foam Savings Calculator for Portsmouth

Homes in Portsmouth typically cut energy use by 32%–42% with spray foam. Change the numbers below to fit your home.

Foam type
$1,732
Estimated annual savings
At about 37% off your energy bill
$5,100–$8,200
Rough install cost
Attic roofline, about 5.5" of open cell
3–5 years
Estimated payback
Install cost ÷ annual savings

These are estimates, not quotes. Actual savings vary based on home size, current insulation, energy rates, and climate conditions. Savings estimates are based on Department of Energy data for the Very Cold climate zone. Cost assumes the attic roofline (about 1.15× your home's square footage) at typical installed prices of $0.40–$0.65 per board foot for open cell and $1.00–$1.50 for closed cell; a two-story home has less roof and usually costs less. Get quotes from the contractors below for real prices.

Verified Contractors in Portsmouth

5⭐
1 Google reviews

Recent Reviews:

Derek Gowen★★★★★a month ago

5⭐
16 Google reviews

Recent Reviews:

Kelly Snyder★★★★★4 months ago

I was very appreciative of the fast response and respect that was given to me

Ember★★★★★4 months ago

The did work for my friends did a great job

John James★★★★★6 months ago

The whole team was very knowledgeable and extremely nice!

4.6⭐
300 Google reviews

Recent Reviews:

Robert Kerens★★★★★a month ago

Christiono,,Dave and crew spray insulated cleaned up, and did a thorough job on my cottage at the beach. They are great guys to deal with and their pricing and efficiency are unmatched. I would highly recommend AJ Pro for your next job.

Bill Toth★★★★★2 months ago

Joe, Chris and Devin just our house after finishing the foam injection process on the back of our house. It’s been a 4 year battle trying to get to the reason for out condensation issues. Hope it works. But I will say, these 3 are 3 people I would invite over for a cookout. So friendly, funny, and accommodating my watching the process. They didn’t shoo me away and I tried to stay clear. All 3 of these guys know their stuff.

Keegan Morin★★★★★a month ago

We had a great experience with USA insulation. I reached out and was able to get a quote very quickly. Quote was reasonable for the job which was great and on point with other companies. Install went very well. The crew was on time and did a very good job removing old insulation, air sealing our attic and then blowing in insulation to code R-49. Crew also cleaned up the job well and left little to no trace. Overall great experience with USA Insulation and I would highly recommend them to anyone looking to upgrade the insulation and overall efficiency of their home.

4⭐
8 Google reviews

Recent Reviews:

Michael Stevens★★★★★a year ago

Thank you Rich. Amazing job! Very professional crew! Got us under target leak! Aerobarrier is amazing technology!

Elizabeth Campbell★★★★★2 years ago

This team was the best. As a professional general contractor myself, Shakes to Shingles (also known as NE Airsealing) stands out among other businesses for their great office and field staff. They were timely, extremely competent, did excellent work, and helped me to maximize my rebate from NH Saves. They conducted blower door tests and IR camera scans to reduce my airleakage by over 50% and performed high insulation installation as well. They were clean, had great communication, and proved to be knowledgeable experts in their field. I can't recommend them enough.

shelly Mayo★★★★★4 years ago

Jason from Shakes to Shingles was wonderful! He did an amazing job. He was super responsive to our need for him to come back twice and retest on short notice. He came after hours, and stayed late to meet our deadline. He was great to work with! Great Company!!

3.7⭐
15 Google reviews

Recent Reviews:

Lisa U★★★★★7 years ago

Gutters were installed super professional. The down spouts match the house, the way in which they extend are perfect rather than the possible large elbows. They crew was very knowledgable. Highly recommend

Rick McAvoy★★★★★6 months ago

Could not be happier with the service I received from Quality Insulation of Portsmouth. Everyone was very professional and the quality of the work was outstanding. Ryan as well as other team members did a beautiful job on my garage project with great communication and service. Charlie was great coming out to give me a quote and was always available via call or text. The whole process from contracts and pricing was great and could not ask for anything more. Highly Recommend!

Ryan Hall★★★★★a year ago

Quality Insulation of Portsmouth gets a solid recommendation from me! They handled the insulation for my new construction home, tackling the standard batt insulation and vapor barrier with professionalism and efficiency. But what really impressed me was their service when I decided to finish the room above my garage. Rick came out to assess the space and provided me with three clear and competitive quotes: one for standard batt insulation, another for a hybrid approach, and a third for full foam insulation. I really appreciated him taking the time to explain the pros and cons of each option. After speaking with some neighbors who had experienced conditioning issues with just batt insulation in similar spaces, I opted for the hybrid approach, and I'm very glad I did. Rick was fantastic to work with throughout the entire process. He was responsive, knowledgeable, and patient with my questions. The quotes were very reasonable, especially considering the quality of service and materials. The installation team was equally impressive. They arrived on time, were courteous and professional, and took the time to walk me through the installation process before they began. They were efficient, the workmanship looked top-notch, and they left the work area incredibly clean when they were finished. They completed the job on schedule and within the quoted price. Overall, I'm extremely satisfied with Quality Insulation of Portsmouth. They delivered excellent service, quality materials, and a professional experience from start to finish. I wouldn't hesitate to use them again and highly recommend them to anyone looking for insulation services.

Recent Reviews:

Abbie Desrosiers★★★★★a year ago

Staff was friendly, helpful and knowledgeable through every step of the insulation process on our new home. We appreciated their communication and responsiveness on our home renovation project.

Denise Benton★★8 years ago

I sadly cannot recommend working with this company at all. Although very affordable, their lack of communication between their employees is frustrating and unprofessional. Over the course of a week, I was stood up for 4 separate appointments that was made by them! I work from home, and have a flexible schedule, but this was a bigger headache than I ever wanted. I had to call the main office and speak to the manager (Jason) on two separate occasions, who was as clueless as Mike (the project manager). And when I finally was able to get them to come to my house, they showed up at 7:30am (earliest I asked for was 8am) when the household wasn't even awake yet. Don't believe my review? Luckily, I have receipts of my entire experience with Mike, the project manager.

Holly Servizio★3 years ago

One of the worst companies I've ever done business with. Only giving them 1 star cuz I can't give them zero. I scheduled my insulation to be put into my addition, tried to schedule it for 2 days but was told by the man I spoke with that the job could be done in one day so I scheduled it the first available apt a month from then. I proceeded to schedule my plasterer and electrician following the insulation. The day comes and no one shows up, we call and they told us it was rescheduled AND NO ONE CALLED US TO TELL US THIS! My husband had taken a vacation day to be their during the job and I had scheduled everyone according to the job being done that day. Now they come the next day, do subpar work and leave at 1:30 with the work NO WHERE NEAR DONE! What happened to a one day job?! I called the office to complain again and fine out when my job will be done and of course no one answers. DO NOT USE THIS COMPANY!!!!

Serves:Greater Seacoast Area

Direct: (603) 418-5062

Direct: (603) 427-2828

Frequently Asked Questions — Spray Foam Insulation in Portsmouth

These are the questions Portsmouth homeowners ask most about spray foam cost, R-value, and open- vs. closed-cell foam — with context for local pricing and roughly 37% typical energy savings. Compare the 8 verified Portsmouth contractors above for exact quotes.

Why is spray foam insulation especially important in cold climates like Portsmouth?▼
In cold climates like Portsmouth, NH, proper insulation is critical to preventing heat loss, ice dams, and frozen pipes. Spray foam's air-sealing properties stop the cold air infiltration that traditional insulation cannot address. It also prevents the moisture buildup inside walls that leads to mold in cold-weather freeze-thaw cycles. Homeowners in NH typically save 25–35% on heating costs. Note: in tightly sealed homes, proper mechanical ventilation is commonly recommended to maintain fresh air exchange without losing the heat you've paid for.
Does spray foam insulation prevent ice dams in Portsmouth?▼
Yes — spray foam insulation is one of the most effective solutions for preventing ice dams in cold climates like Portsmouth, NH. Ice dams form when heat escapes through a poorly insulated attic, melting snow that refreezes at the eaves. By creating an air-tight thermal barrier in the attic, spray foam eliminates the heat loss that causes ice dams in the first place.
What R-value do I need for spray foam insulation in Portsmouth?▼
For cold climates like Portsmouth, NH, the Department of Energy recommends attic insulation of R-49 to R-60. Closed-cell spray foam provides R-6 to R-7 per inch, meaning 8–10 inches achieves code-minimum performance. Open-cell foam at R-3.5 per inch requires greater thickness. A local contractor familiar with NH building codes can recommend the exact specification for your home.
Is spray foam insulation worth the cost?▼
For most homeowners, yes. Spray foam creates an air-tight seal that traditional insulation cannot match, reducing energy bills by 15–35% annually. It also adds structural rigidity, acts as a moisture and vapor barrier, reduces outside noise, and can increase home resale value. The higher upfront cost compared to fiberglass is typically recovered within 3–7 years. One important note: because spray foam creates a very tight building envelope, proper mechanical ventilation is important to maintain healthy indoor air quality and prevent interior moisture buildup. This is typically handled by an Energy Recovery Ventilator (ERV) — a system that brings fresh outside air in while pushing stale air out, recovering the energy from the outgoing air so you don't waste what you paid to heat or cool — or a Heat Recovery Ventilator (HRV), which works similarly but is optimized for cold climates. A qualified contractor will assess whether your home needs ventilation upgrades as part of the installation.
How much does spray foam insulation cost in Portsmouth, NH?▼
In Portsmouth, NH and the surrounding area, spray foam insulation typically costs $1.00–$3.00 per square foot installed, depending on the type and your home's specifics. Open-cell foam runs $0.44–$0.65 per board foot, while closed-cell foam costs $1.00–$2.00 per board foot. A typical 2,000 sq ft home attic in Portsmouth costs $2,000–$6,000. Most Portsmouth homeowners recoup this investment within 3–7 years through energy savings of 15–35% annually.
What is the difference between open-cell and closed-cell spray foam?▼
Open-cell spray foam is softer, less dense, and less expensive. It expands significantly and is ideal for interior walls, attics, and soundproofing. Closed-cell spray foam is denser, stronger, and provides a moisture barrier — making it better for exterior applications, crawl spaces, and areas prone to flooding or humidity. Closed-cell also has a higher R-value per inch (R-6 to R-7 vs R-3.5 to R-4 for open-cell). One key difference: open-cell foam allows some vapor movement, while closed-cell acts as a vapor barrier — an important consideration for your home's ventilation needs.
How long does spray foam insulation last?▼
Spray foam insulation is one of the most durable insulation options available, with a lifespan of 80+ years when properly installed. Unlike fiberglass batting which can sag and settle over time, spray foam maintains its shape and insulating properties indefinitely. It will typically outlast the building it is installed in.
How do I find a qualified spray foam insulation contractor in Portsmouth, NH?▼
When searching for a spray foam contractor in Portsmouth, NH, look for ones who are licensed, insured, and have verifiable reviews. Spray foam requires specialized equipment and training — improper installation can cause off-gassing, adhesion failure, or fire hazards. Ask for references, verify their insurance, and get at least 2–3 quotes. A qualified Portsmouth contractor will also assess your home's ventilation needs — a tightly sealed spray foam installation requires adequate mechanical ventilation to prevent moisture and indoor air quality issues. FoamMatch pre-screens all listed contractors in Portsmouth for licensing and insurance so you can compare verified professionals in your area.
How long does spray foam installation take?▼
Most residential spray foam jobs take 1–2 days depending on the size of the area. A standard attic takes 4–8 hours. After spraying, the foam cures within 24 hours, though most contractors recommend waiting 24–72 hours before occupying the space due to off-gassing during the curing process.
Does spray foam insulation need to be replaced?▼
No — spray foam insulation does not need to be replaced under normal circumstances. Unlike fiberglass insulation which degrades over time, spray foam maintains its R-value and air sealing properties for the life of the building. The only reasons to remove or replace spray foam are water damage, renovation work, or improper original installation.