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Best Insulation Contractors in Dorchester, ON (2026)

26 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Dorchester: Great Northern Insulation, CR Score 59/100; 4.7★ from 368 Google reviews.

  2. 2

    Best for emergencies (open 24/7): Koala Insulation of London, posts 24/7 hours; ranked #2 of 26.

  3. 6

    Most-reviewed: Hometown Heating and Cooling, 827 Google reviews at 4.9★, the most of 26 ranked; ranked #6.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

26 Dorchester insulation contractors are ranked here by CR Score, from ten published factors. 2 are open 24/7, 9 open Saturdays and 5 open Sundays, based on posted hours. The median Google rating is 4.7★ across 26 rated businesses.

Top 10 insulation contractors in Dorchester at a glance

Top 10 insulation contractors in Dorchester at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Great Northern Insulation594.7★ (368)London, 6 km away—Overall
2Koala Insulation of London595.0★ (21)London, 9 km away24/7Emergencies
3Net Zero Insulation594.9★ (142)London, 15 km awaySat · Evenings—
4Advanced Basement Systems574.9★ (172)London, 17 km away——
5Canadian Spray Foam Systems Ltd.554.7★ (15)London, 18 km awaySat · Sun · Evenings—
6Hometown Heating and Cooling544.9★ (827)Ingersoll, 16 km away—Most reviews
7Home Choice Insulation545.0★ (5)London, 14 km awaySat · Sun—
8Eco Insulation544.6★ (57)London, 18 km away——
9Foam 911 Inc532.7★ (27)London, 11 km awaySat · Sun · Evenings—
10Bay Insulation Systems of Canada ULC524.2★ (12)London, 7 km away——

The 26 best insulation contractors in Dorchester, ranked

Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.

  1. Ranked #1 in Dorchester

    #1 Great Northern Insulation

    Based in London, 6 km away

    59/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.7★ from 368 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.7★ from 368 Google reviews
    Hours
    Mon–Fri 7:30 AM–5 PM · Sat–Sun closed
    Address
    2485 Innovation Drive, London, ON N6M 0C8
    View profile for Great Northern Insulation(800) 265-1914

  2. #2 Koala Insulation of London

    Based in London, 9 km away

    59/100CR Score

    Ranked #2 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 21 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2179 Flying Club Rd, London, ON N5V 3Z9
    View profile for Koala Insulation of London(226) 774-3802

  3. #3 Net Zero Insulation

    Based in London, 15 km away

    59/100CR Score

    Ranked #3 because of its Google rating and trade focus: 4.9★ from 142 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 142 Google reviews
    Hours
    Mon–Sat 8 AM–8 PM · Sun closed
    Address
    1910 Highbury Ave N, London, ON N5X 0E5
    View profile for Net Zero Insulation(519) 914-6380

  4. #4 Advanced Basement Systems

    Based in London, 17 km away

    57/100CR Score

    Ranked #4 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 172 Google reviews
    Hours
    Mon–Thu 8 AM–5 PM · Fri 8 AM–4 PM · Sat–Sun closed
    Address
    199 Exeter Rd Unit E, London, ON N6L 1A4
    View profile for Advanced Basement Systems(226) 271-8708

  6. #6 Hometown Heating and Cooling

    Based in Ingersoll, 16 km away

    54/100CR Score

    Ranked #6 because of its Google rating and review volume: 4.9★ from 827 Google reviews, the most in Dorchester.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 827 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    113 Mutual St N, Ingersoll, ON N5C 1Z8
    View profile for Hometown Heating and Cooling(519) 425-0555

  7. #7 Home Choice Insulation

    Based in London, 14 km away

    54/100CR Score

    Ranked #7 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 5 Google reviews
    Hours
    Mon–Fri 7 AM–5 PM · Sat–Sun 9 AM–3 PM
    Address
    414 King St, London, ON N6B 1S6
    View profile for Home Choice Insulation(226) 927-5555

  8. #8 Eco Insulation

    Based in London, 18 km away

    54/100CR Score

    Ranked #8 because of its Google rating and trade focus: 4.6★ from 57 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.6★ from 57 Google reviews
    Hours
    Mon–Fri 8 AM–4 PM · Sat–Sun closed
    Address
    611 Wonderland Rd N #381, London, ON N6H 5N7
    View profile for Eco Insulation(519) 673-6363

  9. #9 Foam 911 Inc

    Based in London, 11 km away

    53/100CR Score

    Ranked #9 because of its Google rating and trade focus: 2.7★ from 27 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 2.7★ from 27 Google reviews
    Hours
    Mon–Sun 8 AM–8 PM
    Address
    185 Ashland Ave, London, ON N5W 4E1
    View profile for Foam 911 Inc(519) 661-7788

  11. #11 Sprayco Insulation Inc.

    Based in Aylmer, 28 km away

    52/100CR Score

    Ranked #11 because of its Google rating and trade focus: 4.7★ from 15 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.7★ from 15 Google reviews
    Hours
    Mon–Fri 6 AM–8 PM · Sat 6 AM–5 PM · Sun closed
    Address
    54449 Eden Line, Aylmer, ON N5H 2R3
    View profile for Sprayco Insulation Inc.(226) 973-6982

  12. #12 London Star Drywall

    Based in London, 14 km away

    52/100CR Score

    Ranked #12 because of its Google rating and trade focus: 3.6★ from 5 Google reviews, listed on Google as “Insulation contractor”.

    Based on 7 of 10 factors; credentials, recency and availability not yet collected.

    • 3.6★ from 5 Google reviews
    Address
    5 Farmhouse Ct, London, ON N5Y 5M4
    View profile for London Star Drywall(519) 630-6464

  14. #14 Belform Insulation

    Based in London, 17 km away

    52/100CR Score

    Ranked #14 because of its Google rating and trade focus: 4.8★ from 4 Google reviews, listed on Google as “Insulation contractor”.

    Based on 7 of 10 factors; credentials, recency and availability not yet collected.

    • 4.8★ from 4 Google reviews
    Address
    4231 Blakie Rd, London, ON N6L 1B8
    View profile for Belform Insulation(519) 652-5190

  15. #15 Ritchie's Insulation & General Contracting

    Based in St. Thomas, 27 km away

    51/100CR Score

    Ranked #15 because of its Google rating and trade focus: 4.5★ from 26 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.5★ from 26 Google reviews
    Hours
    Mon–Thu 7:30 AM–5 PM · Fri 7:30 AM–12 PM · Sat–Sun closed
    Address
    43853 Southdale Line, St Thomas, ON N5P 3S6
    View profile for Ritchie's Insulation & General Contracting(519) 633-3461

  17. #17 Woodstock Spray Foam Insulation

    Based in Woodstock, 34 km away

    50/100CR Score

    Ranked #17 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 6 Google reviews
    Hours
    Mon–Fri 8 AM–7 PM · Sat 9 AM–7 PM · Sun closed
    Address
    369 Griffin Wy, Woodstock, ON N4T 0N2
    View profile for Woodstock Spray Foam Insulation(226) 242-6614

  18. #18 S & R Stucco & Insulation

    Based in London, 25 km away

    50/100CR Score

    Ranked #18 because of its Google rating and trade focus: 4.7★ from 10 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.7★ from 10 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    Address
    3657 Woodhull Rd, London, ON N6P 1P2
    View profile for S & R Stucco & Insulation(519) 652-9403

  19. #19 Icon Insulation London Shop

    Based in London, 21 km away

    50/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.7★ from 7 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.7★ from 7 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    Address
    3836 Colonel Talbot Rd, London, ON N6P 1H5
    View profile for Icon Insulation London Shop(519) 652-2442

  20. #20 Driedger Brothers Insulation

    Based in Norfolk County, 33 km away

    50/100CR Score

    Ranked #20 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 13 Google reviews
    Hours
    Mon–Fri 7 AM–5:30 PM · Sat–Sun closed
    Address
    17 Wood St E, Norwich, ON N0J 1X0
    View profile for Driedger Brothers Insulation(519) 550-6368

  22. #22 Arctic Attics

    Based in London, 31 km away

    49/100CR Score

    Ranked #22 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 3 Google reviews
    Hours
    Mon–Sat 9 AM–6 PM · Sun closed
    View profile for Arctic Attics(226) 213-5202

  23. #23 RPM @ Home Team London

    Based in London, 14 km away

    47/100CR Score

    Ranked #23 because of its Google rating and review volume: 4.5★ from 42 Google reviews.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.5★ from 42 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    466 King St, London, ON N6B 1T1
    View profile for RPM @ Home Team London(833) 952-5387

All 26 insulation contractors

#1 to #25 are shown in full above. Here are #26 to #26, in CR Score order; each links to its profile.

insulation contractors in Dorchester, ranks 26 to 26
RankBusinessCR ScoreGoogle ratingDistance
26Space Tech Insulation Ltd473.9★ (7)36 km

Also serving Dorchester

15 more insulation contractors within 40 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.

Unranked insulation contractors serving Dorchester
BusinessGoogle ratingDistance
1,2 Seal Insulation Inc.19 km
4Point Home Solutions5.0★ (1)21 km
Attic Loose Fill Solutions5.0★ (1)9 km
Dicola (Drywall) Interiors Limited24 km
Echo Solutions Group35 km
Forest City Foam Insulation39 km
Frenchy's Insulation5.0★ (1)29 km
HotRockPanels5.0★ (2)9 km
Insulation Contractors London5.0★ (1)15 km
Insulation Ingersoll16 km
London Spray Foam5.0★ (2)13 km
Mcloughlin Treasures32 km
Net Zero Insulation16 km
Paulray insulation24 km
Tornado Insulation17 km

How much do insulation contractors cost in Dorchester?

US national ranges converted to CAD, not adjusted for Dorchester. Each row names its basis and the month we checked it.

How much do insulation contractors cost in Dorchester?
JobLowTypicalHighBasisChecked
Attic insulationCA$2,390CA$2,950CA$3,510Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)October 2026

How we ranked Dorchester insulation contractors

We scored 26 Dorchester 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Dorchester data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

Insulation contractors in Dorchester: frequently asked questions

Who is the best insulation contractor in Dorchester?

By CR Score, the highest-ranked insulation contractor in Dorchester, ON is Great Northern Insulation with a CR Score of 59/100. It has 4.7★ from 368 Google reviews. Koala Insulation of London (#2) and Net Zero Insulation (#3) follow. We ranked 26 insulation contractors on ten factors, last updated October 22, 2026.

How many insulation contractors are there in Dorchester?

ContractorsRanked ranks 26 insulation contractors serving Dorchester, ON. Another 15 within 40 km are listed but not ranked yet. Counts are as of October 2026.

Which insulation contractors in Dorchester are open 24/7?

2 ranked insulation contractors in Dorchester post 24/7 hours. The highest-ranked are Koala Insulation of London (#2) and Active Environmental Safety (#21). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which insulation contractors in Dorchester work on weekends?

9 of 26 ranked insulation contractors post Saturday hours and 5 post Sunday hours. The highest-ranked open Saturdays are Koala Insulation of London (#2), Net Zero Insulation (#3) and Canadian Spray Foam Systems Ltd. (#5). Posted hours are office hours; crews may book weekend jobs separately.

How much does attic insulation cost in Dorchester?

Attic insulation typically costs CA$2,390 to CA$3,510, with CA$2,950 typical (Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)). This is a national range, not adjusted for Dorchester. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Dorchester insulation contractors have?

The median Google rating among 26 rated insulation contractors in Dorchester is 4.7★, with a median of 15 reviews. Hometown Heating and Cooling has the most, 827 reviews, and ranks #6. 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 Dorchester count in this ranking?

Yes, if they are within 40 km of the Dorchester city centre, 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 Dorchester

  1. October 2026: CR Scores recalculated for 26 insulation contractors serving Dorchester.

More insulation contractors and Dorchester pages

Other trades in Dorchester