90/100CR Score
Ranked #1 because of its Google rating and review volume: 5.0★ from 89 Google reviews, the most Google reviews on this list (89).
- 5.0★ from 89 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Best Insulation Contractors in Janesville, WI (2026)
19 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Janesville: Basswood Roofing LLC, CR Score 90/100; 5.0★ from 89 Google reviews; open 24/7.
- 3
Best for emergencies (open 24/7): Legan Construction & Remodeling, posts 24/7 hours; ranked #3 of 19.
- 2
Most-reviewed: Accurate Insulation Solutions LLC, 64 Google reviews at 4.9★, the most of 19 ranked after Basswood Roofing LLC; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
19 Janesville insulation contractors are ranked here by CR Score, from 8 published factors. 3 are open 24/7, 9 open Saturdays and 6 open Sundays, based on posted hours. The median Google rating is 5.0★ across 19 rated businesses.
Top 10 insulation contractors in Janesville at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Basswood Roofing LLC | 90 | 5.0★ (89) | Janesville | 24/7 | Overall |
| 2 | Accurate Insulation Solutions LLC | 83 | 4.9★ (64) | Fort Atkinson, 19 mi away | Sat | Most reviews |
| 3 | Legan Construction & Remodeling | 83 | 4.7★ (12) | Janesville | 24/7 | Emergencies |
| 4 | Janesville | 83 | 5.0★ (4) | Janesville | Sat · Sun · Evenings | — |
| 5 | Beneficial Insulation Solutions | 81 | 5.0★ (3) | Janesville | Sat · Sun · Evenings | — |
| 6 | Top Tier Insulation LLC | 78 | 4.9★ (35) | South Beloit, 15 mi away | — | — |
| 7 | Beneficial Insulation and Exteriors | 78 | 4.9★ (28) | Fitchburg, 14 mi away | — | — |
| 8 | A+ (Plus) Insulation Janesville | 78 | 4.2★ (13) | Janesville | — | — |
| 9 | Janesville Spray Foam Insulation | 78 | 5.0★ (22) | South Beloit, 15 mi away | — | — |
| 10 | Tuescher Painting & Drywall Finishing | 76 | 5.0★ (35) | Janesville | — | — |
The 19 best insulation contractors in Janesville, ranked
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.
Based in Fort Atkinson, 19 mi away
83/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.9★ from 64 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 64 Google reviews
- Hours
- Mon–Sat 7 AM–6 PM · Sun closed
- Address
- 1705 Montclair Pl, Fort Atkinson, WI 53538
Based in Janesville
83/100CR ScoreRanked #3 because of its Google rating and availability: 4.7★ from 12 Google reviews, open 24/7.
- 4.7★ from 12 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3446 Stellar Dr, Janesville, WI 53548
#4 Janesville
Based in Janesville
83/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 4 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 4029 N County Rd F Unit J-7, Janesville, WI 53545
Based in Janesville
81/100CR ScoreRanked #5 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–Sun 7 AM–8 PM
- Address
- Janesville, WI 53547
Based in South Beloit, 15 mi away
78/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 35 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 35 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat–Sun closed
Based in Fitchburg, 14 mi away
78/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 28 Google reviews, listed on Google as “Insulation contractor”.
- 4.9★ from 28 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat–Sun closed
Based in Janesville
78/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.2★ from 13 Google reviews, listed on Google as “Insulation contractor”.
- 4.2★ from 13 Google reviews
- Hours
- Mon–Fri 8 AM–4 PM · Sat–Sun closed
Based in South Beloit, 15 mi away
78/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 22 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat–Sun closed
Based in Janesville
76/100CR ScoreRanked #10 because of its Google rating and review volume: 5.0★ from 35 Google reviews, 35 Google reviews.
- 5.0★ from 35 Google reviews
- Hours
- Mon–Fri 7:30 AM–5 PM · Sat–Sun closed
Based in Beloit, 9 mi away
76/100CR 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–Fri 7 AM–8 PM · Sat closed · Sun 7 AM–8 PM
- Address
- 2600 W Creedy Rd, Beloit, WI 53511
Based in Whitewater, 18 mi away
76/100CR ScoreRanked #12 because of its Google rating and availability: 4.2★ from 5 Google reviews, open 24/7.
- 4.2★ from 5 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 109 N 2nd St, Whitewater, WI 53190
Based in Loves Park, 25 mi away
75/100CR ScoreRanked #13 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 24 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat–Sun closed
Based in Stoughton, 23 mi away
74/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 4 Google reviews
- Hours
- Mon–Sat 6 AM–6 PM · Sun closed
- Address
- 2508 County Hwy N, Stoughton, WI 53589
Based in Janesville
74/100CR ScoreRanked #15 because of its Google rating and review volume: 5.0★ from 18 Google reviews, 18 Google reviews.
- 5.0★ from 18 Google reviews
- Hours
- Mon–Fri 8 AM–3:30 PM · Sat–Sun closed
- Address
- 1220 W Court St, Janesville, WI 53548
#16 Foamtech LLC
Based in Stoughton, 18 mi away
72/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
- 5.0★ from 5 Google reviews
- Hours
- Mon–Fri 7 AM–4:30 PM · Sat–Sun closed
- Address
- 2259 County Hwy A, Stoughton, WI 53589
Based in Fitchburg, 17 mi away
71/100CR ScoreRanked #17 because of its Google rating and review volume: 5.0★ from 15 Google reviews, 15 Google reviews.
- 5.0★ from 15 Google reviews
- Hours
- Mon–Sat 9 AM–4 PM · Sun closed
Based in Machesney Park, 21 mi away
69/100CR ScoreRanked #18 because of its Google rating and availability: 4.3★ from 6 Google reviews, open Saturdays until 6 PM.
- 4.3★ from 6 Google reviews
- Hours
- Mon–Sat 8 AM–6 PM · Sun closed
- Address
- 994 Wissmach Ln, Machesney Park, IL 61115
#19 Let Mikey Do It
Based in Madison, 21 mi away
66/100CR ScoreRanked #19 because of its Google rating and review volume: 4.2★ from 14 Google reviews, 14 Google reviews.
- 4.2★ from 14 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat–Sun closed
Also serving Janesville
9 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 |
|---|---|---|
| Adams & Sons Roofing Ltd. | 3.0★ (12) | In Janesville |
| Choice Insulation | 24 mi | |
| Saunders Insulation Specialists | 20 mi | |
| Schoonover Insulation Inc | 3.0★ (1) | 13 mi |
| Stritzel & Sons Builders Inc | 5.0★ (2) | 17 mi |
| Stritzel Property Services LLC | 1.0★ (1) | 18 mi |
| Swanson Spray Systems | 5.0★ (2) | 9 mi |
| Thermal Design Inc | 5.0★ (1) | 20 mi |
| Wisco Insulation LLC | 21 mi |
How much do insulation contractors cost in Janesville?
National price ranges in USD, not adjusted for Janesville. 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 Janesville insulation contractors
We scored 19 Janesville 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 Janesville 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 |
Insulation contractors in Janesville: frequently asked questions
Who is the best insulation contractor in Janesville?
By CR Score, the highest-ranked insulation contractor in Janesville, WI is Basswood Roofing LLC with a CR Score of 90/100. It has 5.0★ from 89 Google reviews. It is open 24/7. Accurate Insulation Solutions LLC (#2) and Legan Construction & Remodeling (#3) follow. We ranked 19 insulation contractors on 8 factors, last updated October 22, 2026.
How many insulation contractors are there in Janesville?
ContractorsRanked ranks 19 insulation contractors serving Janesville, WI. 7 of them are based in Janesville; the rest serve it from nearby towns. Another 9 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which insulation contractors in Janesville are open 24/7?
3 ranked insulation contractors in Janesville post 24/7 hours. The highest-ranked are Basswood Roofing LLC (#1), Legan Construction & Remodeling (#3) and Legge Painting & Pre-Finishing (#12). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which insulation contractors in Janesville work on weekends?
9 of 19 ranked insulation contractors post Saturday hours and 6 post Sunday hours. The highest-ranked open Saturdays are Basswood Roofing LLC (#1), Accurate Insulation Solutions LLC (#2) and Legan Construction & Remodeling (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does attic insulation cost in Janesville?
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 Janesville. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Janesville insulation contractors have?
The median Google rating among 19 rated insulation contractors in Janesville is 5.0★, with a median of 14 reviews. Basswood Roofing LLC has the most, 89 reviews, and ranks #1. 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 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do insulation contractors outside Janesville count in this ranking?
Yes, if they are within 25 mi of the Janesville 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 Janesville
- October 2026: CR Scores recalculated for 19 insulation contractors serving Janesville.
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