56/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 13 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat 8 AM–1 PM · Sun closed
Best Insulation Contractors in Dover, NH (2026)
15 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Dover: Efficient Home Services, LLC, CR Score 56/100; 5.0★ from 13 Google reviews; open Saturdays until 1 PM.
- 3
Best for emergencies (open 24/7): My Home Contracting, posts 24/7 hours; ranked #3 of 15.
- 7
Most-reviewed: TC Hafford Basement Systems, 290 Google reviews at 4.6★, the most of 15 ranked; ranked #7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
15 Dover insulation contractors are ranked here by CR Score, from ten published factors. 1 is open 24/7, 9 open Saturdays and 2 open Sundays, based on posted hours. The median Google rating is 4.8★ across 15 rated businesses.
Top 10 insulation contractors in Dover at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Efficient Home Services, LLC | 56 | 5.0★ (13) | Eliot, 8 mi away | Sat | Overall |
| 2 | D&D Insulation LLC | 55 | 4.6★ (14) | Barrington, 9 mi away | Sat | — |
| 3 | My Home Contracting | 55 | 5.0★ (7) | Concord, 19 mi away | 24/7 | Emergencies |
| 4 | Sheehan Real Estate LLC | 55 | 4.4★ (27) | Durham, 5 mi away | — | — |
| 5 | Simplified Green Homes | 54 | 4.8★ (39) | Lebanon, 15 mi away | — | — |
| 6 | Ambient Insulations LLC | 54 | 4.7★ (13) | Hampton, 14 mi away | Sat | — |
| 7 | TC Hafford Basement Systems | 53 | 4.6★ (290) | Biddeford, 16 mi away | Sat · Evenings | Most reviews |
| 8 | The Green Cocoon, LIC - Home Insulation Contractor | 53 | 4.8★ (73) | Amesbury, 25 mi away | — | — |
| 9 | Quality Insulation of Portsmouth | 51 | 3.8★ (13) | Portsmouth, 12 mi away | — | — |
| 10 | Johnson Spray Foam Insulators LLC | 51 | 5.0★ (6) | Pembroke, 20 mi away | Sat | — |
The 15 best insulation contractors in Dover, ranked
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.
Based in Barrington, 9 mi away
55/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.6★ from 14 Google reviews, listed on Google as “Insulation contractor”.
- 4.6★ from 14 Google reviews
- Hours
- Mon–Sat 8 AM–6 PM · Sun closed
- Address
- 300 Calef Hwy, Lee, NH 03861
Based in Concord, 19 mi away
55/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 7 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 17 Raymond Rd, Deerfield, NH 03037
Based in Durham, 5 mi away
55/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.4★ from 27 Google reviews, listed on Google as “Insulation contractor”.
- 4.4★ from 27 Google reviews
- Hours
- Mon–Fri 8 AM–3 PM · Sat–Sun closed
- Address
- 7 Mill Rd Unit L, Durham, NH 03824
Based in Lebanon, 15 mi away
54/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.8★ from 39 Google reviews, listed on Google as “Insulation contractor”.
- 4.8★ from 39 Google reviews
- Hours
- Mon–Fri 6:30 AM–5:30 PM · Sat–Sun closed
- Address
- 9 Little River Rd, Lebanon, ME 04027
Based in Hampton, 14 mi away
54/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.7★ from 13 Google reviews, listed on Google as “Insulation contractor”.
- 4.7★ from 13 Google reviews
- Hours
- Mon–Sat 8 AM–6 PM · Sun closed
- Address
- 74 Lovering Rd, North Hampton, NH 03862
Based in Biddeford, 16 mi away
53/100CR ScoreRanked #7 because of its Google rating and review volume: 4.6★ from 290 Google reviews, the most in Dover.
- 4.6★ from 290 Google reviews
- Hours
- Mon–Fri 8 AM–7 PM · Sat 9 AM–1 PM · Sun closed
- Address
- 12 Homestead Dr, Wells, ME 04090
Based in Amesbury, 25 mi away
53/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.8★ from 73 Google reviews, listed on Google as “Insulation contractor”.
- 4.8★ from 73 Google reviews
- Hours
- Mon–Fri 8 AM–4 PM · Sat–Sun closed
- Address
- 107 Elm St Rear, Salisbury, MA 01952
Based in Portsmouth, 12 mi away
51/100CR ScoreRanked #9 because of its Google rating and trade focus: 3.8★ from 13 Google reviews, listed on Google as “Insulation contractor”.
- 3.8★ from 13 Google reviews
- Hours
- Mon–Fri 6:30 AM–5 PM · Sat–Sun closed
- Address
- 360 Constitution Ave, Portsmouth, NH 03801
Based in Pembroke, 20 mi away
51/100CR ScoreRanked #10 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 6 Google reviews
- Hours
- Mon–Sat 6 AM–5 PM · Sun closed
- Address
- 230 Ye Olde Canterbury Rd, Northwood, NH 03261
#11 A2B Spray Foam
Based in Derry, 15 mi away
51/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 3 Google reviews
- Hours
- Mon–Sat 7 AM–7 PM · Sun closed
Based in Chester, 22 mi away
51/100CR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 233 Google reviews.
- 4.9★ from 233 Google reviews
- Hours
- Mon–Fri 8 AM–5:30 PM · Sat–Sun closed
- Address
- 213 Haverhill Rd Unit 8B, East Kingston, NH 03827
Based in Bedford, 23 mi away
50/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 7 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat 9 AM–5 PM · Sun closed
Based in Sanford, 16 mi away
50/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 8 Google reviews
- Hours
- Mon–Fri 8 AM–4 PM · Sat–Sun closed
- Address
- 1550 Main St, Sanford, ME 04073
Based in Concord, 20 mi away
48/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “Concrete contractor”.
- 4.2★ from 5 Google reviews
- Hours
- Mon–Sun 7 AM–9:30 PM
- Address
- 148 Old Turnpike Rd, Northwood, NH 03261
Also serving Dover
14 more insulation contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Bad Apple | 18 mi | |
| Foam Fellas | 3.0★ (2) | 1 mi |
| Foam Fellas LLC Spray foam Insulation - Professional Spray Foam Insulation Contractor in Dover NH | 1 mi | |
| Fox Hill Spray Foam | 3.0★ (2) | 11 mi |
| Insulkings | 16 mi | |
| Irex Energy Solutions | 17 mi | |
| Jones Boys Insulation Inc | 12 mi | |
| Krempel Insulation Technologies LP | 5.0★ (1) | 23 mi |
| Portsmouth Spray Foam Insulation Pros | 5.0★ (1) | 7 mi |
| Seacoast Home Services & Energy Auditing | 6 mi | |
| Solarize Window Insulators | 5.0★ (1) | 23 mi |
| Tailored Insulation LLc | 23 mi | |
| The Energy Hound | 24 mi | |
| The Worthmore Group | 5.0★ (1) | 21 mi |
How much do insulation contractors cost in Dover?
National price ranges in USD, not adjusted for Dover. 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 |
How we ranked Dover insulation contractors
We scored 15 Dover 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 Dover 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 |
Insulation contractors in Dover: frequently asked questions
Who is the best insulation contractor in Dover?
By CR Score, the highest-ranked insulation contractor in Dover, NH is Efficient Home Services, LLC with a CR Score of 56/100. It has 5.0★ from 13 Google reviews. It is open Saturdays until 1 PM. D&D Insulation LLC (#2) and My Home Contracting (#3) follow. We ranked 15 insulation contractors on ten factors, last updated October 22, 2026.
How many insulation contractors are there in Dover?
ContractorsRanked ranks 15 insulation contractors serving Dover, NH. Another 14 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which insulation contractors in Dover are open 24/7?
1 ranked insulation contractor in Dover posts 24/7 hours. The highest-ranked is My Home Contracting (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which insulation contractors in Dover work on weekends?
9 of 15 ranked insulation contractors post Saturday hours and 2 post Sunday hours. The highest-ranked open Saturdays are Efficient Home Services, LLC (#1), D&D Insulation LLC (#2) and My Home Contracting (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does attic insulation cost in Dover?
Attic insulation typically costs $1,700 to $2,500, with $2,100 typical (Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range). This is a national range, not adjusted for Dover. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Dover insulation contractors have?
The median Google rating among 15 rated insulation contractors in Dover is 4.8★, with a median of 13 reviews. TC Hafford Basement Systems has the most, 290 reviews, and ranks #7. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank insulation contractors?
Each insulation contractor gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do insulation contractors outside Dover count in this ranking?
Yes, if they are within 25 mi of the Dover city center, our service radius for insulation contractors. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Update log for Dover
- October 2026: CR Scores recalculated for 15 insulation contractors serving Dover.
More insulation contractors and Dover pages
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