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Best Insulation Contractors in London, ON (2026)

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

The short answer

  1. 1

    Best overall in London: Net Zero Insulation, CR Score 61/100; 4.9★ from 142 Google reviews; open Saturdays until 8 PM.

  2. 2

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

  3. 16

    Most-reviewed: Hometown Heating and Cooling, 827 Google reviews at 4.9★, the most of 24 ranked; ranked #16.

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

24 London insulation contractors are ranked here by CR Score, from ten published factors. 2 are open 24/7, 8 open Saturdays and 5 open Sundays, based on posted hours. The median Google rating is 4.7★ across 24 rated businesses.

Top 10 insulation contractors in London at a glance

Top 10 insulation contractors in London at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Net Zero Insulation614.9★ (142)LondonSat · EveningsOverall
2Koala Insulation of London615.0★ (21)London24/7Emergencies
3Great Northern Insulation604.7★ (368)London——
4Advanced Basement Systems604.9★ (172)London——
5Canadian Spray Foam Systems Ltd.584.7★ (15)LondonSat · Sun · Evenings—
6Eco Insulation564.6★ (57)London——
7Home Choice Insulation565.0★ (5)LondonSat · Sun—
8Foam 911 Inc552.7★ (27)LondonSat · Sun · Evenings—
9Belform Insulation554.8★ (4)London——
10London Star Drywall543.6★ (5)London——

The 24 best insulation contractors in London, ranked

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

  1. Ranked #1 in London

    #1 Net Zero Insulation

    Based in London

    61/100CR Score

    Ranked #1 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

  2. #2 Koala Insulation of London

    Based in London

    61/100CR 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 Great Northern Insulation

    Based in London

    60/100CR Score

    Ranked #3 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

  4. #4 Advanced Basement Systems

    Based in London

    60/100CR 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 Eco Insulation

    Based in London

    56/100CR Score

    Ranked #6 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

  7. #7 Home Choice Insulation

    Based in London

    56/100CR 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 Foam 911 Inc

    Based in London

    55/100CR Score

    Ranked #8 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

  9. #9 Belform Insulation

    Based in London

    55/100CR Score

    Ranked #9 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

  10. #10 London Star Drywall

    Based in London

    54/100CR Score

    Ranked #10 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

  11. #11 Arctic Attics

    Based in London

    54/100CR Score

    Ranked #11 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

  13. #13 S & R Stucco & Insulation

    Based in London

    54/100CR Score

    Ranked #13 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

  15. #15 Icon Insulation London Shop

    Based in London

    53/100CR Score

    Ranked #15 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

  16. #16 Hometown Heating and Cooling

    Based in Ingersoll, 29 km away

    52/100CR Score

    Ranked #16 because of its Google rating and review volume: 4.9★ from 827 Google reviews, the most in London.

    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

  18. #18 Ritchie's Insulation & General Contracting

    Based in St. Thomas, 27 km away

    51/100CR Score

    Ranked #18 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

  20. #20 Sprayco Insulation Inc.

    Based in Aylmer, 39 km away

    50/100CR Score

    Ranked #20 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

  23. #23 RPM @ Home Team London

    Based in London

    49/100CR 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

  24. #24 Harp Exteriors

    Based in Lambton Shores, 39 km away

    42/100CR Score

    Ranked #24 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Siding contractor”.

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

    • 5.0★ from 14 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    View profile for Harp Exteriors(226) 333-4277

Also serving London

20 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 London
BusinessGoogle ratingDistance
1st Choice Home Solutions4.6★ (160)In London
Accell Roofing Inc4.8★ (61)In London
Affordable Home Up Keep & RenovationsIn London
Attic Loose Fill Solutions5.0★ (1)17 km
Copp's Buildall4.3★ (218)In London
Davinci Contractors Group Inc.4.6★ (57)In London
Dicola (Drywall) Interiors LimitedIn London
Drywall Contractors & Installation5.0★ (1)In London
Forest City Foam InsulationIn London
Gutter Guys Plus4.9★ (277)In London
Halcyon Homes4.4★ (13)In London
Himalaya Group | Roofing , Siding, Eaves & Commercial , London Ontario4.9★ (99)In London
HotRockPanels5.0★ (2)In London
Insulation Contractors London5.0★ (1)In London
London Drywallers4.9★ (13)In London
London Spray Foam5.0★ (2)In London
Millstone Homes of London4.3★ (96)In London
Net Zero InsulationIn London
Roy Inch & Sons Home Services by Enercare4.7★ (1,490)In London
Tornado InsulationIn London

How much do insulation contractors cost in London?

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

How much do insulation contractors cost in London?
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 London insulation contractors

We scored 24 London 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 London 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 London: frequently asked questions

Who is the best insulation contractor in London?

By CR Score, the highest-ranked insulation contractor in London, ON is Net Zero Insulation with a CR Score of 61/100. It has 4.9★ from 142 Google reviews. It is open Saturdays until 8 PM. Koala Insulation of London (#2) and Great Northern Insulation (#3) follow. We ranked 24 insulation contractors on ten factors, last updated October 22, 2026.

How many insulation contractors are there in London?

ContractorsRanked ranks 24 insulation contractors serving London, ON. 19 of them are based in London; the rest serve it from nearby towns. Another 20 within 40 km are listed but not ranked yet. Counts are as of October 2026.

Which insulation contractors in London are open 24/7?

2 ranked insulation contractors in London post 24/7 hours. The highest-ranked are Koala Insulation of London (#2) and Active Environmental Safety (#17). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which insulation contractors in London work on weekends?

8 of 24 ranked insulation contractors post Saturday hours and 5 post Sunday hours. The highest-ranked open Saturdays are Net Zero Insulation (#1), Koala Insulation of London (#2) 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 London?

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 London. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do London insulation contractors have?

The median Google rating among 24 rated insulation contractors in London is 4.7★, with a median of 17 reviews. Hometown Heating and Cooling has the most, 827 reviews, and ranks #16. 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 London count in this ranking?

Yes, if they are within 40 km of the London 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 London

  1. October 2026: CR Scores recalculated for 24 insulation contractors serving London.

More insulation contractors and London pages

Other trades in London