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Best Insulation Contractors in Alliston, ON (2026)

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

The short answer

  1. 1

    Best overall in Alliston: Addmore Insulation, CR Score 85/100; 4.6★ from 36 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Ainger Group Roofing and Exteriors, posts 24/7 hours; ranked #2 of 39.

  3. 2

    Most-reviewed: Ainger Group Roofing and Exteriors, 476 Google reviews at 4.9★, the most of 39 ranked; ranked #2.

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

39 Alliston insulation contractors are ranked here by CR Score, from 8 published factors. 11 are open 24/7, 26 open Saturdays and 19 open Sundays, based on posted hours. The median Google rating is 4.9★ across 39 rated businesses.

Top 10 insulation contractors in Alliston at a glance

Top 10 insulation contractors in Alliston at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Addmore Insulation854.6★ (36)Barrie, 26 km away24/7Overall
2Ainger Group Roofing and Exteriors844.9★ (476)Barrie, 31 km away24/7Emergencies, Most reviews
3Insul-Nation Canada Inc.844.8★ (4)Alliston24/7—
4Spartan Insulation845.0★ (50)Barrie, 25 km awaySat · Sun · Evenings—
5Insulation Newmarket - Jarrah Contracting Services834.8★ (132)Newmarket, 35 km awaySat · Sun · Evenings—
6Spray Foam Kings824.9★ (64)Aurora, 37 km awaySat · Sun · Evenings—
7Clear Air Solutions814.6★ (31)Barrie, 24 km awaySat · Sun · Evenings—
8Spray Foam Masters Barrie814.8★ (21)Barrie, 24 km awaySat · Sun · Evenings—
9Fine Finish Wall Systems815.0★ (45)East Gwillimbury, 19 km awaySat—
10Real Blue Roofing Services Inc.805.0★ (124)Barrie, 25 km awaySat · Sun · Evenings—

The 39 best insulation contractors in Alliston, ranked

Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.

  1. Ranked #1 in Alliston

    #1 Addmore Insulation

    Based in Barrie, 26 km away

    85/100CR Score

    Ranked #1 because of its Google rating and availability: 4.6★ from 36 Google reviews, open 24/7.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.6★ from 36 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Addmore Insulation(705) 896-7463

  4. #4 Spartan Insulation

    Based in Barrie, 25 km away

    84/100CR Score

    Ranked #4 because of its Google rating and trade focus: 5.0★ from 50 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 50 Google reviews
    Hours
    Mon–Sun 8 AM–8 PM
    Address
    131 Saunders Rd, Barrie, ON L4N 9A7
    View profile for Spartan Insulation(888) 225-9223

  5. #5 Insulation Newmarket - Jarrah Contracting Services

    Based in Newmarket, 35 km away

    83/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.8★ from 132 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.8★ from 132 Google reviews
    Hours
    Mon–Fri 7:30 AM–9 PM · Sat–Sun 9 AM–9 PM
    Address
    16700 Bayview Ave #214, Newmarket, ON L3X 1W1
    View profile for Insulation Newmarket - Jarrah Contracting Services(905) 251-1141

  6. #6 Spray Foam Kings

    Based in Aurora, 37 km away

    82/100CR Score

    Ranked #6 because of its Google rating and trade focus: 4.9★ from 64 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.9★ from 64 Google reviews
    Hours
    Mon–Sun 8 AM–10 PM
    Address
    120 Metcalfe St, Aurora, ON L4G 1E8
    View profile for Spray Foam Kings(647) 641-6881

  7. #7 Clear Air Solutions

    Based in Barrie, 24 km away

    81/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.6★ from 31 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.6★ from 31 Google reviews
    Hours
    Mon–Fri 8 AM–8 PM · Sat 8 AM–4 PM · Sun 10 AM–4 PM
    Address
    341 King St Unit 8, Barrie, ON L4N 6B5
    View profile for Clear Air Solutions(705) 721-1600

  8. #8 Spray Foam Masters Barrie

    Based in Barrie, 24 km away

    81/100CR Score

    Ranked #8 because of its Google rating and trade focus: 4.8★ from 21 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.8★ from 21 Google reviews
    Hours
    Mon–Sun 7 AM–7 PM
    Address
    27 Willow Fern Dr, Barrie, ON L4N 1S7
    View profile for Spray Foam Masters Barrie(705) 571-3008

  9. #9 Fine Finish Wall Systems

    Based in East Gwillimbury, 19 km away

    81/100CR Score

    Ranked #9 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 45 Google reviews
    Hours
    Mon–Fri 8 AM–6 PM · Sat 8 AM–12 PM · Sun closed
    View profile for Fine Finish Wall Systems(647) 298-7185

  12. #12 White Dust Drywall

    Based in Barrie, 29 km away

    79/100CR Score

    Ranked #12 because of its Google rating and trade focus: 4.9★ from 10 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.9★ from 10 Google reviews
    Hours
    Mon–Sun 5 AM–11:30 PM
    View profile for White Dust Drywall(647) 643-2543

  15. #15 DNS Insulation

    Based in Barrie, 29 km away

    78/100CR Score

    Ranked #15 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 6 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    208 Nina Rd, Barrie, ON L4N 7Y6
    View profile for DNS Insulation(416) 660-8355

  16. #16 Gorilla Insulation- Spray Foam and Drywall

    Based in East Gwillimbury, 33 km away

    77/100CR Score

    Ranked #16 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 22 Google reviews
    Hours
    Mon–Sat 7 AM–7 PM · Sun closed
    Address
    1460 Queensville Sideroad E, Queensville, ON L0L 1R0
    View profile for Gorilla Insulation- Spray Foam and Drywall(416) 567-8702

  17. #17 Spray Foam Barrie

    Based in Barrie, 31 km away

    77/100CR Score

    Ranked #17 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.2★ from 5 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    14 Tudor Crescent, Barrie, ON L4M 0A8
    View profile for Spray Foam Barrie(705) 881-1945

  19. #19 911 Roofer

    Based in Innisfil, 31 km away

    75/100CR Score

    Ranked #19 because of its Google rating and availability: 4.3★ from 15 Google reviews, open 24/7.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.3★ from 15 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    935 Helen St, Innisfil, ON L9S 1T5
    View profile for 911 Roofer(416) 939-7377

  20. #20 Canada Green Insulation Inc

    Based in Newmarket, 34 km away

    74/100CR Score

    Ranked #20 because of its Google rating and trade focus: 4.8★ from 62 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.8★ from 62 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    Address
    28 Main St N Unit# 3, Newmarket, ON L3Y 3Z7
    View profile for Canada Green Insulation Inc(437) 238-8444

  21. #21 Great Northern Insulation

    Based in Barrie, 28 km away

    74/100CR Score

    Ranked #21 because of its Google rating and trade focus: 4.3★ from 148 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 4.3★ from 148 Google reviews
    Hours
    Mon–Fri 7:30 AM–5 PM · Sat–Sun closed
    Address
    29 Ferndale Industrial Dr, Barrie, ON L4N 9W2
    View profile for Great Northern Insulation(800) 265-1914

  25. #25 Milan Insulation

    Based in Barrie, 24 km away

    73/100CR Score

    Ranked #25 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Insulation contractor”.

    Based on 6 of 8 factors; credentials and recency not yet collected.

    • 5.0★ from 9 Google reviews
    Hours
    Mon–Fri 9 AM–7 PM · Sat–Sun closed
    Address
    21 Commerce Park Dr unit K, Barrie, ON L4N 9P6
    View profile for Milan Insulation(416) 717-6655

All 39 insulation contractors

#1 to #25 are shown in full above. Here are #26 to #39, in CR Score order; each links to its profile.

insulation contractors in Alliston, ranks 26 to 39
RankBusinessCR ScoreGoogle ratingDistance
26Stucco Systems724.3★ (10)24 km
27Arcamm Roofing713.7★ (14)37 km
28Phoenix Renovation715.0★ (20)38 km
29The Next Level Consulting | Energy Assessments For Residential and Business714.9★ (184)35 km
30Ray Leavitt Drywall Inc.704.0★ (4)25 km
31Barrie Flooring and building supplies705.0★ (13)25 km
32DR Foam Insulation Services Ltd.704.0★ (5)29 km
334plus Inc.695.0★ (6)16 km
34Elaras construction685.0★ (11)36 km
35Francis Roofing Ltd.685.0★ (32)28 km
36FayTrim Exterior Solutions674.4★ (64)24 km
37King Drywall Systems623.4★ (9)34 km
38Roof Pro Plus Home Improvements623.7★ (53)35 km
39Fastform Insulated Concrete Forms614.3★ (3)34 km

Also serving Alliston

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 Alliston
BusinessGoogle ratingDistance
Arcamm Roofing, Insulation & Eavestrough24 km
Celluloseman26 km
Creative Global Services5.0★ (2)35 km
Donmor Drywall4.0★ (1)In Alliston
Elder's Insulation & Drywall5.0★ (2)24 km
Insulation Innisfil- Jarrah Contracting Services inc26 km
JG Sprayfoam Inc.13 km
Masterinsulator26 km
Medoro Insulation24 km
Obvious Choice Contracting Inc5.0★ (2)39 km
Right Choice Spray Foam Solutions Inc5.0★ (2)35 km
Robert Devries Drywall & Taping5.0★ (1)39 km
Roberts Air Systems5.0★ (1)24 km
Semple Solutions5.0★ (1)In Alliston
Sound Seals Insulation5.0★ (1)20 km
South Innisfil Insulation26 km
SPFM Spray Foam Insulation and Coatings5.0★ (1)26 km
SprayX16 km
SS Drywall and Taping5.0★ (22)In Alliston
ThermEco Construction Corp.5.0★ (1)29 km

How much do insulation contractors cost in Alliston?

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

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

We scored 39 Alliston 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Alliston data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

Insulation contractors in Alliston: frequently asked questions

Who is the best insulation contractor in Alliston?

By CR Score, the highest-ranked insulation contractor in Alliston, ON is Addmore Insulation with a CR Score of 85/100. It has 4.6★ from 36 Google reviews. It is open 24/7. Ainger Group Roofing and Exteriors (#2) and Insul-Nation Canada Inc. (#3) follow. We ranked 39 insulation contractors on 8 factors, last updated October 22, 2026.

How many insulation contractors are there in Alliston?

ContractorsRanked ranks 39 insulation contractors serving Alliston, ON. 1 of them is based in Alliston; 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 Alliston are open 24/7?

11 ranked insulation contractors in Alliston post 24/7 hours. The highest-ranked are Addmore Insulation (#1), Ainger Group Roofing and Exteriors (#2) and Insul-Nation Canada Inc. (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which insulation contractors in Alliston work on weekends?

26 of 39 ranked insulation contractors post Saturday hours and 19 post Sunday hours. The highest-ranked open Saturdays are Addmore Insulation (#1), Ainger Group Roofing and Exteriors (#2) and Insul-Nation Canada Inc. (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does attic insulation cost in Alliston?

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

What Google rating do Alliston insulation contractors have?

The median Google rating among 39 rated insulation contractors in Alliston is 4.9★, with a median of 16 reviews. Ainger Group Roofing and Exteriors has the most, 476 reviews, and ranks #2. 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 Alliston count in this ranking?

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

  1. October 2026: CR Scores recalculated for 39 insulation contractors serving Alliston.
  2. October 2026: 1 duplicate listing merged.

More insulation contractors and Alliston pages

Other trades in Alliston