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Best General Contractors in Cornwall, ON (2026)

22 general contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Cornwall: Iron Fort Construction & Renovation, CR Score 65/100; 4.3★ from 59 Google reviews; open 24/7.

  2. 3

    Best for emergencies (open 24/7): Nxtgen Construction, posts 24/7 hours; ranked #3 of 22.

  3. 2

    Most-reviewed: Millennial Contracting Inc., 43 Google reviews at 4.8★, the most of 22 ranked after Iron Fort Construction & Renovation; ranked #2.

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

22 Cornwall general contractors are ranked here by CR Score, from ten published factors. 4 are open 24/7, 9 open Saturdays and 8 open Sundays, based on posted hours. The median Google rating is 5.0★ across 22 rated businesses.

Top 10 general contractors in Cornwall at a glance

Top 10 general contractors in Cornwall at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Iron Fort Construction & Renovation654.3★ (59)Cornwall24/7Overall
2Millennial Contracting Inc.614.8★ (43)Cornwall—Most reviews
3Nxtgen Construction595.0★ (5)Cornwall24/7Emergencies
4T&B Next Level Construction LLC595.0★ (8)CornwallSat · Sun · Evenings—
5JSM Elite Contracting595.0★ (20)Cornwall——
6Baqi renovations585.0★ (3)Cornwall24/7—
7Cornwall Renovations JSM Elite575.0★ (4)CornwallSat · Sun—
8Poirier Renovation575.0★ (12)Cornwall——
9DeSaulniers Construction Ltd563.7★ (6)Cornwall——
10Canadian Barge Builders563.7★ (9)Cornwall24/7—

The 22 best general contractors in Cornwall, ranked

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

  2. #2 Millennial Contracting Inc.

    Based in Cornwall

    61/100CR Score

    Ranked #2 because of its Google rating and trade focus: 4.8★ from 43 Google reviews, listed on Google as “Construction company”.

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

    • 4.8★ from 43 Google reviews
    Hours
    Mon–Thu 8 AM–5 PM · Fri 8 AM–4 PM · Sat–Sun closed
    Address
    755 Sandfield Crescent, Cornwall, ON K6H 5C4
    View profile for Millennial Contracting Inc.(613) 897-1850

  3. #3 Nxtgen Construction

    Based in Cornwall

    59/100CR Score

    Ranked #3 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Construction company”.

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

    • 5.0★ from 5 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    44 Pitt St, Cornwall, ON K6J 3P2
    View profile for Nxtgen Construction(613) 577-5513

  5. #5 JSM Elite Contracting

    Based in Cornwall

    59/100CR Score

    Ranked #5 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Construction company”.

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

    • 5.0★ from 20 Google reviews
    Hours
    Mon–Fri 8 AM–6 PM · Sat–Sun closed
    Address
    7, 501 Campbell St, Cornwall, ON K6H 6X5
    View profile for JSM Elite Contracting(613) 927-9919

  6. #6 Baqi renovations

    Based in Cornwall

    58/100CR Score

    Ranked #6 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Construction company”.

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

    • 5.0★ from 3 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Baqi renovations(613) 870-2551

  8. #8 Poirier Renovation

    Based in Cornwall

    57/100CR Score

    Ranked #8 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Construction company”.

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

    • 5.0★ from 12 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    View profile for Poirier Renovation

  10. #10 Canadian Barge Builders

    Based in Cornwall

    56/100CR Score

    Ranked #10 because of its Google rating and trade focus: 3.7★ from 9 Google reviews, listed on Google as “Boat builders”.

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

    • 3.7★ from 9 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2050 Boundary Rd, Cornwall, ON K6H 7S8
    View profile for Canadian Barge Builders(866) 227-4340

  11. #11 Rose Mech

    Based in Cornwall

    56/100CR Score

    Ranked #11 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Construction company”.

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

    • 5.0★ from 9 Google reviews
    Hours
    Mon–Fri 7 AM–5 PM · Sat–Sun closed
    Address
    2 Structured Products Rd, Long Sault, ON K0C 1P0
    View profile for Rose Mech(613) 596-9500

  12. #12 Cornwall Gravel

    Based in Cornwall

    56/100CR Score

    Ranked #12 because of its Google rating and trade focus: 3.8★ from 16 Google reviews, listed on Google as “Construction company”.

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

    • 3.8★ from 16 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    390 Eleventh St W, Cornwall, ON K6J 3B2
    View profile for Cornwall Gravel(613) 932-6571

  13. #13 Red Maple Building Company

    Based in Cornwall

    56/100CR Score

    Ranked #13 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Construction company”.

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

    • 5.0★ from 4 Google reviews
    Address
    18153 County Rd 19, Cornwall, ON K0C 1P0
    View profile for Red Maple Building Company

  14. #14 Wilson Construction

    Based in Cornwall

    55/100CR Score

    Ranked #14 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Construction company”.

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

    • 5.0★ from 4 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat 9 AM–2 PM · Sun closed
    View profile for Wilson Construction(613) 362-6699

  16. #16 Cottonmill Lofts

    Based in Cornwall

    54/100CR Score

    Ranked #16 because of its Google rating and trade focus: 3.0★ from 3 Google reviews, listed on Google as “Construction company”.

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

    • 3.0★ from 3 Google reviews
    Address
    709 Cotton Mill St, Cornwall, ON K6H 7K7
    View profile for Cottonmill Lofts(613) 933-1905

  17. #17 Marks Remodeling

    Based in Massena, 19 km away

    54/100CR Score

    Ranked #17 because of its Google rating and trade focus: 3.0★ from 6 Google reviews, listed on Google as “Contractor”.

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

    • 3.0★ from 6 Google reviews
    Hours
    Mon–Sat 7 AM–6 PM · Sun 7 AM–12 PM
    Address
    10202 NY-56, Massena, NY 13662
    View profile for Marks Remodeling(315) 263-3649

  19. #19 Bourgon Construction

    Based in Cornwall

    53/100CR Score

    Ranked #19 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “General contractor”.

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

    • 5.0★ from 3 Google reviews
    Hours
    Mon–Fri 7 AM–5 PM · Sat–Sun closed
    Address
    3306 Second St E, Cornwall, ON K6H 6J8
    View profile for Bourgon Construction(613) 932-2022

  20. #20 Seaway Contracting

    Based in Cornwall

    52/100CR Score

    Ranked #20 because of its Google rating and trade focus: 3.7★ from 3 Google reviews, listed on Google as “General contractor”.

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

    • 3.7★ from 3 Google reviews
    Hours
    Mon–Fri 8 AM–4:30 PM · Sat–Sun closed
    Address
    17433 S Branch Rd, St Andrews West, ON K0C 2A0
    View profile for Seaway Contracting(613) 935-3700

  21. #21 Premier Renovations

    Based in Malone, 40 km away

    49/100CR Score

    Ranked #21 because of its Google rating and trade focus: 2.3★ from 3 Google reviews, listed on Google as “Contractor”.

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

    • 2.3★ from 3 Google reviews
    Hours
    Mon–Sun 7 AM–5 PM
    Address
    248 Webster St, Malone, NY 12953
    View profile for Premier Renovations(518) 651-9409

Also serving Cornwall

20 more general 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 general contractors serving Cornwall
BusinessGoogle ratingDistance
1st Drywall5.0★ (17)In Cornwall
Amazing Roofing5.0★ (3)In Cornwall
Beautified Creations Construction and Restoration5.0★ (25)In Cornwall
Cross Roads Pavement Markings Inc.5.0★ (8)In Cornwall
Grant Marion Construction4.5★ (19)In Cornwall
Hint of Tint4.7★ (12)In Cornwall
Image Renovations Cornwall5.0★ (8)In Cornwall
Ionic Electrical Contracting Inc.4.8★ (97)In Cornwall
J.F. Markell Homes Ltd.4.3★ (6)In Cornwall
Little Digger5.0★ (22)In Cornwall
MacDonell's Landscape and Construction5.0★ (20)In Cornwall
Menard Robertson Custom Homes and Renovations Inc.4.8★ (12)In Cornwall
Paul Davis Cornwall - Brockville4.0★ (55)In Cornwall
Phil's Renovations5.0★ (4)In Cornwall
Prime Home Builders5.0★ (9)In Cornwall
Room-By-Room3.4★ (5)In Cornwall
SD&G Contracting4.3★ (21)In Cornwall
William Roach Roofing4.6★ (20)In Cornwall
WINMAR Cornwall3.8★ (13)In Cornwall
Your Vision Contracting3.0★ (2)In Cornwall

How much do general contractors cost in Cornwall?

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

How much do general contractors cost in Cornwall?
JobLowTypicalHighBasisChecked
Kitchen remodelCA$20,510CA$37,930CA$58,490Per project: typical range of customer-reported remodels (about $75 to $250 per sq ft). US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)October 2026
Bathroom remodelCA$9,350CA$17,080CA$24,820Per bathroom: typical range of customer-reported remodels. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)October 2026

How we ranked Cornwall general contractors

We scored 22 Cornwall general 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 Cornwall 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

General contractors in Cornwall: frequently asked questions

Who is the best general contractor in Cornwall?

By CR Score, the highest-ranked general contractor in Cornwall, ON is Iron Fort Construction & Renovation with a CR Score of 65/100. It has 4.3★ from 59 Google reviews. It is open 24/7. Millennial Contracting Inc. (#2) and Nxtgen Construction (#3) follow. We ranked 22 general contractors on ten factors, last updated October 22, 2026.

How many general contractors are there in Cornwall?

ContractorsRanked ranks 22 general contractors serving Cornwall, ON. 18 of them are based in Cornwall; 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 general contractors in Cornwall are open 24/7?

4 ranked general contractors in Cornwall post 24/7 hours. The highest-ranked are Iron Fort Construction & Renovation (#1), Nxtgen Construction (#3) and Baqi renovations (#6). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which general contractors in Cornwall work on weekends?

9 of 22 ranked general contractors post Saturday hours and 8 post Sunday hours. The highest-ranked open Saturdays are Iron Fort Construction & Renovation (#1), Nxtgen Construction (#3) and T&B Next Level Construction LLC (#4). Posted hours are office hours; crews may book weekend jobs separately.

How much does kitchen remodel cost in Cornwall?

Kitchen remodel typically costs CA$20,510 to CA$58,490, with CA$37,930 typical (Per project: typical range of customer-reported remodels (about $75 to $250 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 Cornwall. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Cornwall general contractors have?

The median Google rating among 22 rated general contractors in Cornwall is 5.0★, with a median of 5 reviews. Iron Fort Construction & Renovation has the most, 59 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.

How does ContractorsRanked rank general contractors?

Each general 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 general contractors outside Cornwall count in this ranking?

Yes, if they are within 40 km of the Cornwall city centre, our service radius for general 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 Cornwall

  1. October 2026: CR Scores recalculated for 22 general contractors serving Cornwall.

More general contractors and Cornwall pages