The best general contractors in Newmarket in 2026 are Pro House Maintenance, Alfa Design and Renovation and LOON Renovation, then five more top-rated local firms. Our Google Maps searches found 106 businesses for Newmarket. Only 23 were Newmarket contractors with a website and 4.5 stars from 10 or more reviews. A focused single-room GTA renovation runs $50,000 to $110,000 in 2026, one guide says.
- Only 23 of the 106 businesses our Newmarket general contractor search found met our bar of 4.5 stars from 10 or more reviews.
- Alfa Design and Renovation leads the Newmarket list with a 5.0 Google rating from 42 reviews.
- Newmarket charges $6.32 per square metre to permit a house alteration in 2026, and $21.02 per square metre for a low-rise addition.
- General West Contractors puts a focused GTA renovation at $50,000 to $110,000 and a whole-floor job at $110,000 to $220,000 in 2026.
- Capable Group puts a one-storey GTA home addition at $350 to $450 per square foot before HST, drawings and permits.
| Rank | Company | Best for | Credentials | Google rating | Based in |
|---|---|---|---|---|---|
| 1 | Pro House Maintenance | Comparing vetted general contractors for free | Every pro: licences, WSIB, insurance, references, background | Not applicable (matching service) | Serves Newmarket |
| 2 | Alfa Design and Renovation | Basement finishing with 3D design | Founded 2013 (company-stated) | 5.0 (42 reviews) | Newmarket |
| 3 | LOON Renovation | Permit-heavy renovations with a written warranty | Founded 2007, Insurance stated (company-stated) | 5.0 (28 reviews) | Newmarket |
| 4 | KingsRidge Building Group | Renovations plus landscaping | None stated on its website | 4.9 (71 reviews) | Newmarket |
| 5 | Regal Home Group | Home additions | None stated on its website | 5.0 (19 reviews) | Newmarket |
| 6 | Raytive Homes | Custom home builds | None stated on its website | 5.0 (15 reviews) | Newmarket |
| 7 | STILE contracting + design | Design-build renovations in older Newmarket homes | None stated on its website | 5.0 (13 reviews) | Newmarket |
| 8 | Blue Dome Ltd | Projects that need architectural drawings | None stated on its website | 5.0 (11 reviews) | Newmarket |
Who are the best general contractors in Newmarket in 2026?
The best general contractors in Newmarket in 2026 are Pro House Maintenance, Alfa Design and Renovation and LOON Renovation. Five more firms round out the top eight. Six of the seven firms we rank hold a 5.0 Google rating, and they have 11 to 71 reviews each.
1. Pro House Maintenance: best for comparing vetted general contractors for free
Pro House Maintenance is a free way for Newmarket homeowners to compare general contractors. Before any pro joins our network, we check WSIB clearance, liability insurance, references and background. You describe the project once, get several written quotes and pick a pro, backed by our satisfaction guarantee.
- Trade licences. Renovations and additions often include electrical and gas work, so we confirm ESA and TSSA licences for the trades that need them.
- WSIB clearance and liability insurance. We confirm a current WSIB clearance and commercial general liability insurance before a pro joins our network.
- Reviews and references. We read public reviews and speak with past clients before a pro is accepted, looking for patterns, not one-off complaints.
- Background checks. We run background checks before a pro is matched with homeowners, because the people in your home matter as much as the work.
- Tell us about the job. Share the project and your address through the free quote form. It takes about a minute.
- Get matched with vetted pros. We match you with several pros who have already passed our checks and serve your area.
- Compare written quotes. Each pro gives you a written quote, so you can compare price, scope and timing side by side.
- Hire with a guarantee behind you. You choose who to hire. Work from a pro we matched you with is backed by our satisfaction guarantee; ask us for the terms before you sign.
2. Alfa Design and Renovation: best for basement finishing with 3D design
- Google rating 5.0 from 42 reviews checked Nov 4, 2026
- Founded 2013 company website
- Based in Newmarket
- Visit the Alfa Design and Renovation website
Alfa Design and Renovation has a Mynden Way address in Newmarket and a 5.0 Google rating from 42 reviews. Its site says it has delivered renovation and interior design across the GTA “since 2013.” It lists kitchens, bathrooms, commercial work and basement finishing, including rental suites.
- Strengths: Its site offers “3D design before construction,” so you can see the layout before work starts.
- Watch-outs: Parts of its site describe it as Toronto-based, so confirm the crew and schedule for a Newmarket job.
- Best for: Turning a Newmarket basement into a living space or rental suite.
3. LOON Renovation: best for permit-heavy renovations with a written warranty
- Google rating 5.0 from 28 reviews checked Nov 4, 2026
- Founded 2007 company website
- Warranty 5-year workmanship warranty company website
- Based in Newmarket
- Visit the LOON Renovation website
LOON Renovation has a Kathryn Crescent address in Newmarket and a 5.0 Google rating from 28 reviews. Its site says it has done residential and commercial renovations “since 2007” across Newmarket, Aurora, Richmond Hill and Markham. It offers a “5-Year Warranty on Workmanship.”
- Strengths: Its site says, “We carry $5 million in liability insurance and full WSIB coverage,” and it handles permits through final inspection.
- Watch-outs: It takes commercial jobs too, so ask who will run your residential site day to day.
- Best for: A structural or layout change where you want permits and a warranty in one contract.
4. KingsRidge Building Group: best for renovations plus landscaping
- Google rating 4.9 from 71 reviews checked Nov 4, 2026
- Based in Newmarket
- Visit the KingsRidge Building Group website
KingsRidge Building Group has a Main Street South address in Newmarket and a 4.9 Google rating from 71 reviews, the most of any ranked firm. Its site lists custom homes, renovations, landscaping and pools. It says the founder, Caleb, started the firm in his teens.
- Strengths: One firm can handle both an interior renovation and the yard work around it.
- Watch-outs: We found no warranty terms or insurance details on its site, so ask for both in writing.
- Best for: A renovation that also needs a new patio, landscaping or pool.
5. Regal Home Group: best for home additions
- Google rating 5.0 from 19 reviews checked Nov 4, 2026
- Based in Newmarket
- Visit the Regal Home Group website
Regal Home Group has a Davis Drive address in Newmarket and a 5.0 Google rating from 19 reviews. Its site cites “over 17 years of experience” and says the owner, Misha, “still oversees every project.” It names custom home additions as a specialty, alongside kitchens, bathrooms and basements.
- Strengths: It serves Toronto, York Region and the GTA, and it says it handles city paperwork for additions.
- Watch-outs: Its home page headline targets Toronto, so confirm start dates for a Newmarket job.
- Best for: A rear or side addition where you want the owner on site.
6. Raytive Homes: best for custom home builds
- Google rating 5.0 from 15 reviews checked Nov 4, 2026
- Based in Newmarket
- Visit the Raytive Homes website
Raytive Homes has a Bayview Avenue address in Newmarket and a 5.0 Google rating from 15 reviews. Its site calls it a custom home builder and says it works “with a HCRA licensed builder.” It also takes on general contracting, renovation and landscaping jobs.
- Strengths: It can build from your architect’s plans, design from scratch or act as project manager.
- Watch-outs: Confirm its builder licence in the HCRA Ontario Builder Directory before you sign, since we did not match one.
- Best for: A knock-down rebuild or new custom home on a Newmarket lot.
7. STILE contracting + design: best for design-build renovations in older Newmarket homes
- Google rating 5.0 from 13 reviews checked Nov 4, 2026
- Based in Newmarket
- Visit the STILE contracting + design website
STILE contracting + design has a Main Street South address in Newmarket and a 5.0 Google rating from 13 reviews. Its site calls it “a full service design & build team, with expertise in all aspects of residential construction and home renovations.” It builds design consultation into every project.
- Strengths: Its Main Street base sits close to the older homes around downtown Newmarket.
- Watch-outs: Its site is short and lists no warranty or insurance details, so ask for both in writing.
- Best for: A renovation where you want design help from the first meeting.
8. Blue Dome Ltd: best for projects that need architectural drawings
- Google rating 5.0 from 11 reviews checked Nov 4, 2026
- Based in Newmarket
- Visit the Blue Dome Ltd website
Blue Dome has a Buckingham Road address in Newmarket and a 5.0 Google rating from 11 reviews. Its site lists “architectural design, interior design, construction & renovation.” It says one team takes a job from first sketch to final build. That includes home renovations and additions.
- Strengths: One firm can draw the plans and build them, which can cut handoffs on an addition.
- Watch-outs: It has the fewest reviews of the ranked firms, so ask for recent Newmarket references.
- Best for: An addition or major renovation that needs permit drawings first.
How much does a general contractor cost in Newmarket?
A focused GTA renovation, such as a mid-range kitchen or two bathrooms, costs $50,000 to $110,000 in 2026, says General West Contractors, a firm not ranked here. Capable Group, a Woodbridge firm, puts a one-storey addition at $350 to $450 per square foot. Most general contractors build their fee into those totals.
| Job | Typical cost (CAD) | Source |
|---|---|---|
| Focused renovation (one major room) | $50,000 to $110,000 | General West Contractors |
| Whole-floor or multi-room renovation | $110,000 to $220,000 | General West Contractors |
| One-storey addition, 250 sq ft | $88,000 to $113,000 | Capable Group |
| Second-storey addition | $400 to $550 per sq ft | Capable Group |
| Newmarket alteration permit | $6.32 per m² | Town of Newmarket |
| Newmarket low-rise addition permit | $21.02 per m² | Town of Newmarket |
Scope drives the price more than the permit does. General West puts a contractor’s markup at 15 to 25% of hard costs and suggests a 10 to 15% contingency. Capable Group says drawings, engineering and permits add another 15 to 25% on top of an addition’s build cost.
Our general contractor cost guide breaks fees and markups down, and the general contractor statistics cover Ontario job data. Planning more space? Get free home addition quotes in Newmarket from screened pros.
How do you choose a general contractor in Newmarket?
To choose a Newmarket general contractor, check its WSIB clearance and liability cover. Ask who pulls each permit, then compare written quotes for the same scope. Ontario law says any home reno contract worth more than $50 must be in writing. The province also suggests a deposit of no more than 10% of the price.
- Check the licence. A general contractor hires the trades, and Ontario says no one can run an electrical contracting business without an ESA licence. Check the electrician on your job in ESA's Contractor Locator.
- Confirm WSIB clearance. Ask for the company’s WSIB account number and confirm a current clearance on WSIB’s free eClearance lookup.
- Ask for proof of liability insurance. A certificate of commercial general liability insurance should name the company that will do the work.
- Ask about city licences and permits. Ask Newmarket whether the job needs a municipal licence or building permit before work starts.
- Get it in writing. Under Ontario law, any home renovation contract worth more than $50 must be in writing, and the final price cannot exceed an estimate by more than 10% unless you agree (Ontario consumer protection rules).
- Keep the deposit small. Ontario recommends a down payment of no more than 10%, and never paying in full before the work is done.
Newmarket says the owner and the contractor are equally liable under the Building Code Act. So make sure the permit is issued before work starts. Ontario also says, “The final price for all goods and services cannot be more than 10% over the original estimate unless you have agreed to new work or a new price.”
Doing the lower level? Our basement finishing cost guide has Ontario prices, or compare basement renovation quotes in Newmarket. Nearby, see the best general contractors in Aurora, the best general contractors in Richmond Hill and the top Barrie general contractors.
How did we rank these Newmarket general contractors?
We ranked these firms on public data, and no firm paid for a spot. Our Google Maps searches for Newmarket found 106 businesses. Of those, 64 had a builder or contractor listing, and 50 had a website and a Newmarket base. Just 23 held 4.5 stars from 10 or more reviews.
| Step | Businesses remaining |
|---|---|
| Found on Google Maps | 106 |
| Primary Google category is a general contractor | 64 |
| Open, with a website of its own | 50 |
| In Newmarket (by address or Google map pin) | 50 |
| 4.5+ stars from 10+ Google reviews | 23 |
| Website readable when checked | 15 |
| Listed on this page (top ranked) | 7 |
We then read each site. Five sites would not load. Three firms do other work: cabinets, drop ceilings and caulking. That left 15 that could rank. None matched a licence record in our check, so we make no licence claims. WSIB and insurance proof are the key checks for a Newmarket renovation.
The score blends each rating with its review count, so a 5.0 from 42 reviews ranks above a 5.0 from 11. We checked every fact on November 4, 2026, and we recheck every 90 days. See an error? Tell our editors about it and we will review it.
What do Newmarket homeowners ask before they hire a general contractor?
Newmarket homeowners ask what a renovation costs, which jobs need a permit and how to compare local contractors. These answers draw on two 2026 GTA price guides, the Town of Newmarket building page and 2026 fee schedule, and Ontario consumer rules. Each answer stands alone, so go straight to your question.
How much does a general contractor cost in Newmarket?
It depends on scope. General West Contractors puts a focused GTA renovation, such as a mid-range kitchen or two bathrooms, at $50,000 to $110,000 in 2026. A gutted main floor or a basement plus kitchen runs $110,000 to $220,000. It says the contractor's own markup is typically 15 to 25% of hard costs.
Do I need a building permit to renovate in Newmarket?
For many jobs, yes. The Town of Newmarket lists finishing a basement, adding or removing walls, new or enlarged windows and doors, basement walkouts and additional residential units as projects that need a permit. Attached decks need one too. Work that is only electrical goes to the ESA instead.
How much is a renovation permit in Newmarket?
Newmarket's 2026 fee for a house alteration or renovation is $6.32 per square metre, up 2% from $6.20 in 2025. A low-rise addition is $21.02 per square metre, an additional unit inside existing space is a flat $1,000, and a residential wood deck is a flat $300.
How many good general contractors are there in Newmarket?
By our count, 15 Newmarket general contractors met our bar. Our searches found 106 businesses. Of those, 64 had a contractor listing, 50 had a website and a Newmarket base, and 23 held 4.5 stars from 10 or more reviews. Five sites would not load and three firms do other trades, so 15 could rank.
Is Pro House Maintenance free for Newmarket homeowners?
Yes. Pro House Maintenance is free for homeowners. You describe your renovation once, and we match you with several pros who have passed WSIB, insurance, reference and background checks. You compare their written quotes and choose who to hire, and our satisfaction guarantee backs the work.
Where can you find general contractors near Newmarket?
The closest general contractors lists to Newmarket cover Aurora (6 km away), Richmond Hill (20 km away) and Markham (25 km away). Each list follows the same method: 4.5-star Google ratings from 10 or more reviews, official registry checks where Ontario requires a licence, and free vetted matching from Pro House Maintenance at number one.
- Best general contractors in Aurora (6 km from Newmarket)
- Best general contractors in Richmond Hill (20 km from Newmarket)
- Best general contractors in Markham (25 km from Newmarket)
- Compare free home additions quotes in Newmarket from vetted local pros
- Best general contractors across Ontario, city by city
- Home Additions statistics and cost data from our research team
- General West Contractors, General Contracting Cost Guide (2026)
- Capable Group, Home Addition Cost Calculator: Toronto and GTA Prices (2026)
- Town of Newmarket, Building and Renovating
- Town of Newmarket, 2026 Cost Recovery User Fees, Building Services Division (effective January 1, 2026)
- Government of Ontario, Your rights when starting home renovations or repairs
- WSIB, eClearance lookup