15 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Groton: Anchor Home Inspection, CR Score 85/100; 5.0★ from 611 Google reviews; open evenings.
Best for emergencies (open 24/7): RoofMasters, posts 24/7 hours; ranked #6 of 15.
Most-reviewed: Ace Handyman Services Hartford and New London Counties, 82 Google reviews at 4.7★, the most of 15 ranked after Anchor Home Inspection; ranked #14.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
15 Groton insulation contractors are ranked here by CR Score, from 8 published factors. 1 is open 24/7, 5 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.6★ across 15 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Anchor Home Inspection | 85 | 5.0★ (611) | East Haddam, 9 mi away | Evenings | Overall |
| 2 | Best Home Performance | 80 | 4.6★ (43) | East Haddam, 21 mi away | Sat · Sun | — |
| 3 | Nescor | 78 | 4.0★ (4) | Old Saybrook, 17 mi away | Sat · Sun · Evenings | — |
| 4 | Nealon Insulation of Connecticut | 76 | 5.0★ (66) | Guilford, 22 mi away | — | — |
| 5 | A/Z Corporation | 75 | 4.5★ (11) | Groton | — | — |
| 6 | RoofMasters | 74 | 5.0★ (3) | Norwich, 18 mi away | 24/7 | Emergencies |
| 7 | John Wills Painting & Power Washing Co., LLC | 72 | 4.9★ (53) | East Haddam, 21 mi away | Sat · Evenings | — |
| 8 | C & R Insulation Inc | 72 | 4.6★ (18) | Hebron, 20 mi away | — | — |
| 9 | Anchor Insulation | 72 | 4.3★ (9) | Norwich, 16 mi away | — | — |
| 10 | Quality Insulation of Eastern CT | 71 | 3.7★ (26) | Norwich, 15 mi away | — | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and review volume: 5.0★ from 611 Google reviews, the most Google reviews on this list (611).
Based in East Haddam, 21 mi away
Ranked #2 because of its Google rating and trade focus: 4.6★ from 43 Google reviews, listed on Google as “Insulation contractor”.
Based in Old Saybrook, 17 mi away
Ranked #3 because of its Google rating and trade focus: 4.0★ from 4 Google reviews, listed on Google as “Insulation contractor”.
Based in Guilford, 22 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 66 Google reviews, listed on Google as “Insulation contractor”.
Based in Groton
Ranked #5 because of its Google rating and trade focus: 4.5★ from 11 Google reviews, listed on Google as “Insulation contractor”.
Based in Norwich, 18 mi away
Ranked #6 because of its Google rating and availability: 5.0★ from 3 Google reviews, open 24/7.
Based in East Haddam, 21 mi away
Ranked #7 because of its Google rating and review volume: 4.9★ from 53 Google reviews, 53 Google reviews.
Based in Hebron, 20 mi away
Ranked #8 because of its Google rating and trade focus: 4.6★ from 18 Google reviews, listed on Google as “Insulation contractor”.
Based in Norwich, 16 mi away
Ranked #9 because of its Google rating and trade focus: 4.3★ from 9 Google reviews, listed on Google as “Insulation contractor”.
Based in Norwich, 15 mi away
Ranked #10 because of its Google rating and trade focus: 3.7★ from 26 Google reviews, listed on Google as “Insulation contractor”.
Based in Groton
Ranked #11 because of its Google rating and trade focus: 4.6★ from 16 Google reviews, listed on Google as “Construction company”.
Based in East Haddam, 19 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based in Groton
Ranked #13 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Kitchen remodeler”.
Based in East Haddam, 20 mi away
Ranked #14 because of its Google rating and review volume: 4.7★ from 82 Google reviews, 82 Google reviews.
Based in Bridgeport, 23 mi away
Ranked #15 because of its Google rating and availability: 5.0★ from 12 Google reviews, open Saturdays until 1 PM.
19 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 |
|---|---|---|
| Advanced Construction | 4.5★ (42) | In Groton |
| Alex's Energy Insulation Construction LLC | 5.0★ (2) | 25 mi |
| ASW Construction | 23 mi | |
| Avalanche Plastering LLC | 5.0★ (5) | In Groton |
| Capalbo's Waste Service | 15 mi | |
| CD Roofing | 5.0★ (34) | In Groton |
| CertaPro Painters of Mystic-Glastonbury, CT | 5.0★ (35) | In Groton |
| Dynamic Building & Energy Solutions | In Groton | |
| ESTABLISHED HOMES | 4.7★ (12) | In Groton |
| Foam Dispensing Solutions | 24 mi | |
| Green Energy Insulation & Chimney Caps and Covers ltd | 21 mi | |
| Green Home Solutions of Eastern Connecticut | 4.9★ (270) | In Groton |
| Local HandyMan | 5.0★ (9) | In Groton |
| Mega Innovations LLC | 23 mi | |
| R & R Insulators LLC | 18 mi | |
| R-Value Insulation LLC | 5.0★ (1) | 20 mi |
| R-Value Insulation LLC | 12 mi | |
| Roofing and Home Solutions LLC. | 5.0★ (66) | In Groton |
| ServiceMaster TRS - New London | 4.4★ (53) | In Groton |
National price ranges in USD, not adjusted for Groton. 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 15 Groton insulation contractors on 8 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. Unknown factors are left out of the score, 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 Groton data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |