The Best Insulation Contractors in Michigan

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1Premier Roofing & Exteriors★ 5.00 on this job17 jobs reviewedusually $20,000+iHow Job match is calculatedBuilt only from reviews Google tagged “Attic venting installation”:Stars on this job 55%5.00★Number of such jobs 25%17Overall Experts Score 20%89Job match= 95Stars are pulled toward the category average (4.89★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.95

2The Roof Dr.★ 5.00 on this job4 jobs reviewediHow Job match is calculatedBuilt only from reviews Google tagged “Attic venting installation”:Stars on this job 55%5.00★Number of such jobs 25%4Overall Experts Score 20%85Job match= 80Stars are pulled toward the category average (4.89★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.80

Job match = this company’s ★ on reviews Google tagged “Attic venting installation” (shrunk toward the category average when there are few), how many such jobs it has done, and its overall Experts Score.

What customers said about attic venting installation

KKim1 reviewiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 7 months ago★★★★★

Premier Roofing & Exteriors

Exceptional experience with Austin and Kyle and the team at Premier. Customer service, satisfaction AND roofing are their strongest assets. Thanks again guys for the assurance I choose the best company and products for my recent re-roof project.

Paid $20,000+Reasonable priceRoof installationAttic venting installation

MMitchellLocal Guide · 16 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 3 years ago★★★★★

The Roof Dr.

The Roof Dr. has provided excellent service to me and my friends. As a homeowner of over 40 years I have had multiple experiences with roofing companies. The Roof Dr sets the bar very high. When I refer people to businesses, I recognize that puts my reputation on the line. I never hesitate to refer The Roof Dr… Read full review

Attic ventingAttic venting installationRoof inspection+ Responsiveness+ Punctuality+ Quality

RRobert1 reviewiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 11 months ago★★★★★

Premier Roofing & Exteriors

David answered all my questions , gave a fair price, the work was done quickly and expertly. He came back in two years to answer some additional questions. Great guy and great service.

Paid $18,000–20,000Reasonable priceGutter installationRoof inspectionRoof installation

Vvictor6 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a year ago★★★★★

Premier Roofing & Exteriors

Jarod and Premier roofing did a fabulous job from beginning to end. They kept us informed and were a delight to work with. Highly recommend

Paid $20,000+Reasonable priceGutter installationRoof installationAttic venting installation

AA.4 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a year ago★★★★★

Premier Roofing & Exteriors

I had a fantastic experience with this premier roofing! The team was professional, efficient, and priced very fairly compared to other quotes I received. They worked quickly without cutting corners, and the quality of the job really shows.

Paid $10,000–12,000Great priceAttic venting repairsGutter installationRoof inspection

LLennyLocal Guide · 157 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a year ago★★★★★

Premier Roofing & Exteriors

I am the president of our condo association and I would like to say how completely satisfied we are with Premier Roofing. We acquired multiple bids. Not only were they the most thorough in their presentation, they were the lowest bid. The job was done in a timely manner and the attention to detail was outstanding.… Read full review

Reasonable priceGutter installationAttic ventingSkylight installation

Overall ratings

Experts Score 0–100iExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of insulation contractors).

#	Company	ScoreiExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown.	FactorsiFactor grades, in orderSatisfaction (54%): Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Reliability (24%): How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Craft & service (0%): Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Replies to reviews (7%): How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20.	★iGoogle star rating as shown on Google Maps.	Typical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
1	Michigan Spray Foam InsulationGrandville, MI	A 95iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 69%94+65.1Reliability 31%96+29.5Experts Score= 95Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AA––––	4.93	—
2	Grandville Roofing and SidingGrandville, MI	A 94iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%93+54.6Reliability 26%95+24.8Value 15%100+15.2Craft & service penalty97−0.3Experts Score= 94Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAA–	4.95	$17k
3	Melvin Belk RoofingGrandville, MI	A 92iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%91+49.6Reliability 24%88+21.3Value 14%100+14.1Replies to reviews 7%100+7.1Experts Score= 92Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAA	4.89	$7.1k
4	Gutter Helmet Of Michigan and IllinoisGrandville, MI	A 92iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%96+52.4Reliability 24%91+22.1Value 14%100+14.1Replies to reviews 7%45+3.2Experts Score= 92Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AA–AAC	4.90	—
5	Premier Roofing & ExteriorsGrandville, MI	A 89iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%92+50.2Reliability 24%87+21.1Value 14%100+14.1Replies to reviews 7%61+4.3Craft & service penalty95−0.5Experts Score= 89Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAB	4.91	$16k
6	The Roof Dr.Grandville, MI	A 85iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%90+49.1Reliability 24%82+19.9Value 14%100+14.1Replies to reviews 7%54+3.8Craft & service penalty79−2.1Experts Score= 85Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AABAAC	4.89	$4.1k
7	Michigan Spray Foam InsulationGrandville, MI	A 85iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 69%84+58.2Reliability 31%88+27.1Experts Score= 85Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AA––A–	4.80	—
8	WMGB Home Improvement (Formerly West Michigan Glass Block)Grandville, MI	B 78iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%81+44.2Reliability 24%72+17.5Value 14%100+14.1Replies to reviews 7%100+7.1Craft & service penalty86−1.4Momentum penalty62−3.8Experts Score= 78Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	ABAABA	4.85	—
9	Koala Insulation of Grand RapidsGrandville, MI	B 78iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%82+44.7Reliability 24%73+17.7Value 14%99+14Replies to reviews 7%100+7.1Momentum penalty43−5.7Experts Score= 78Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	ABAACA	4.85	—
10	Georgetown Waterproofing IncGrandville, MI	B 60iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%68+39.9Reliability 26%57+14.9Value 15%93+14.2Craft & service penalty98−0.2Momentum penalty15−8.5Experts Score= 60Not enough data for replies to reviews; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	BCAAF–	4.77	—

What jobs cost

What customers paid, from the price Google asks reviewers to report.

Insulation Contractors in Michigan at a glance

How the 10 insulation contractors we rated in Michigan compare, and what customers praise most.

How we grade

Satisfaction (54%) — Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.

Reliability (24%) — How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.

Craft & service (penalty, up to −10) — Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.

Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.

Momentum (penalty, up to −10) — Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.

Replies to reviews (7%) — How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.