12 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Portsmouth: Ambient Insulations LLC, CR Score 55/100; 4.7★ from 13 Google reviews; open Saturdays until 6 PM.
Best for emergencies (open 24/7): My Home Contracting, posts 24/7 hours; ranked #6 of 12.
Most-reviewed: TC Hafford Basement Systems, 290 Google reviews at 4.6★, the most of 12 ranked; ranked #8.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
12 Portsmouth insulation contractors are ranked here by CR Score, from ten published factors. 1 is open 24/7, 6 open Saturdays and 1 open Sundays, based on posted hours. The median Google rating is 4.8★ across 12 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Ambient Insulations LLC | 55 | 4.7★ (13) | Hampton, 8 mi away | Sat | Overall |
| 2 | The Green Cocoon, LIC - Home Insulation Contractor | 55 | 4.8★ (73) | Amesbury, 17 mi away | — | — |
| 3 | Quality Insulation of Portsmouth | 54 | 3.8★ (13) | Portsmouth | — | — |
| 4 | D&D Insulation LLC | 54 | 4.6★ (14) | Barrington, 14 mi away | Sat | — |
| 5 | Sheehan Real Estate LLC | 53 | 4.4★ (27) | Durham, 9 mi away | — | — |
| 6 | My Home Contracting | 53 | 5.0★ (7) | Concord, 25 mi away | 24/7 | Emergencies |
| 7 | Efficient Home Services, LLC | 53 | 5.0★ (13) | Eliot, 18 mi away | Sat | — |
| 8 | TC Hafford Basement Systems | 52 | 4.6★ (290) | Biddeford, 19 mi away | Sat · Evenings | Most reviews |
| 9 | Simplified Green Homes | 52 | 4.8★ (39) | Lebanon, 24 mi away | — | — |
| 10 | 603 Basement Solutions | 52 | 4.9★ (233) | Chester, 18 mi away | — | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 4.7★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based in Amesbury, 17 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 73 Google reviews, listed on Google as “Insulation contractor”.
Based in Portsmouth
Ranked #3 because of its Google rating and trade focus: 3.8★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based in Barrington, 14 mi away
Ranked #4 because of its Google rating and trade focus: 4.6★ from 14 Google reviews, listed on Google as “Insulation contractor”.
Based in Durham, 9 mi away
Ranked #5 because of its Google rating and trade focus: 4.4★ from 27 Google reviews, listed on Google as “Insulation contractor”.
Based in Concord, 25 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Insulation contractor”.
Based in Eliot, 18 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based in Biddeford, 19 mi away
Ranked #8 because of its Google rating and review volume: 4.6★ from 290 Google reviews, the most in Portsmouth.
Based in Lebanon, 24 mi away
Ranked #9 because of its Google rating and trade focus: 4.8★ from 39 Google reviews, listed on Google as “Insulation contractor”.
Based in Chester, 18 mi away
Ranked #10 because of its Google rating and review volume: 4.9★ from 233 Google reviews.
Based in Derry, 14 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based in Sanford, 23 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Insulation contractor”.
National price ranges in USD, not adjusted for Portsmouth. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Attic insulation | $1,700 | $2,100 | $2,500 | Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range | October 2026 |
We scored 12 Portsmouth insulation contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Portsmouth data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |