82 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Norwalk: Sono Spray Foam Insulation, CR Score 84/100; 4.9★ from 33 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Mid Suffolk Handyman, posts 24/7 hours; ranked #4 of 82.
Most-reviewed: Power Home Remodeling, 3,916 Google reviews at 4.6★, the most of 82 ranked; ranked #48.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
82 Norwalk insulation contractors are ranked here by CR Score, from 8 published factors. 8 are open 24/7, 61 open Saturdays and 28 open Sundays, based on posted hours. The median Google rating is 5.0★ across 82 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sono Spray Foam Insulation | 84 | 4.9★ (33) | Norwalk | Sat · Sun · Evenings | Overall |
| 2 | Discount Insulation Company | 82 | 5.0★ (81) | Greenwich, 18 mi away | Sat · Sun · Evenings | — |
| 3 | Cloud9 Spray Foam | 80 | 5.0★ (17) | Norwalk | Sat · Evenings | — |
| 4 | Mid Suffolk Handyman | 80 | 4.3★ (54) | Centereach, 23 mi away | 24/7 | Emergencies |
| 5 | Pro Legacy Corp | 80 | 5.0★ (100) | Greenburgh, 16 mi away | 24/7 | — |
| 6 | Elite Foam Insulation & Exteriors | 80 | 5.0★ (7) | Stamford, 8 mi away | Sat · Sun · Evenings | — |
| 7 | Adaptive Insulation | 79 | 5.0★ (262) | Mahopac, 25 mi away | Sat | — |
| 8 | Foam A Brothers | 79 | 5.0★ (13) | Darien, 13 mi away | Sat · Sun · Evenings | — |
| 9 | Nu-Way Insulation | 79 | 4.9★ (56) | Larchmont, 23 mi away | Sat · Sun | — |
| 10 | New England Performance Insulation | 79 | 5.0★ (153) | Milford, 22 mi away | Sat | — |
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 trade focus: 4.9★ from 33 Google reviews, listed on Google as “Insulation contractor”.
Based in Greenwich, 18 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 81 Google reviews, listed on Google as “Insulation contractor”.
Based in Norwalk
Ranked #3 because of its Google rating and trade focus: 5.0★ from 17 Google reviews, listed on Google as “Insulation contractor”.
Based in Centereach, 23 mi away
Ranked #4 because of its Google rating and availability: 4.3★ from 54 Google reviews, open 24/7.
Based in Greenburgh, 16 mi away
Ranked #5 because of its Google rating and availability: 5.0★ from 100 Google reviews, open 24/7.
Based in Stamford, 8 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 Mahopac, 25 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 262 Google reviews, listed on Google as “Insulation contractor”.
Based in Darien, 13 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based in Larchmont, 23 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 56 Google reviews, listed on Google as “Insulation contractor”.
Based in Milford, 22 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 153 Google reviews, listed on Google as “Insulation contractor”.
Based in Port Chester, 16 mi away
Ranked #11 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
Based in Bridgeport, 12 mi away
Ranked #12 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
Based in New Canaan, 8 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based in Bridgeport, 12 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based in Mahopac, 24 mi away
Ranked #15 because of its Google rating and availability: 4.7★ from 420 Google reviews, open 24/7.
Based in Stamford, 6 mi away
Ranked #16 because of its Google rating and trade focus: 4.8★ from 18 Google reviews, listed on Google as “Insulation contractor”.
Based in Greenburgh, 20 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Insulation contractor”.
Based in Stratford, 15 mi away
Ranked #18 because of its Google rating and trade focus: 4.5★ from 8 Google reviews, listed on Google as “Insulation contractor”.
Based in Milford, 18 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 39 Google reviews, listed on Google as “Insulation contractor”.
Based in Stratford, 14 mi away
Ranked #20 because of its Google rating and review volume: 4.9★ from 1,222 Google reviews, 1,222 Google reviews.
Based in Stamford, 7 mi away
Ranked #21 because of its Google rating and trade focus: 4.8★ from 11 Google reviews, listed on Google as “Insulation contractor”.
Based in Trumbull, 14 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Insulation contractor”.
Based in Port Chester, 16 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 161 Google reviews, listed on Google as “Insulation contractor”.
Based in Stratford, 14 mi away
Ranked #24 because of its Google rating and availability: 4.5★ from 42 Google reviews, open 24/7.
Based in Mahopac, 20 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 291 Google reviews, listed on Google as “Insulation contractor”.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 82 ranked insulation contractors here; the rest are on their profiles.
20 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.
National price ranges in USD, not adjusted for Norwalk. 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 82 Norwalk 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 Norwalk 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 |