How to Choose a Basement Renovation Contractor in Ontario (2026)

By Dmitry Perstin, Owner, Bedrock Basements

Choosing a basement renovation contractor in Ontario comes down to a short list of things you can actually verify. Confirm the credentials that exist here rather than the American ones you will read about online, get a fully itemized written quote, get a clear plan for the permit, get all of it in a written contract, and go look at finished basements the contractor actually built. A “top 10 basement companies” list will tell you none of that.

I have worked in basement renovation since 2009 and started Bedrock Basements in 2021, and we carry $5 million in general liability coverage. I quote every project myself, which means I have spent a lot of evenings at kitchen tables as the second or third opinion. The homeowners who get burned almost never get burned on craftsmanship. They get burned on scope they never saw, a permit nobody pulled, and a deposit that was too big.

Here is how to run the checks yourself.

Why “best basement renovation companies” lists are not evaluations

Search for the best basement company in your city and you will find plenty of ranked lists. Look at who published them. Most are written by one of the companies on the list, or by a directory that charges for placement. Nobody visited the job sites. Nobody read the contracts. Nobody called the homeowner a year later to ask whether the final invoice matched the quote.

That does not make those companies bad. It means the ranking is not evidence. The checks below are, and you can run all of them in a week.

Why basement work is different from general renovation work

Plenty of good renovation contractors have never finished a basement, and it shows up in the details that only exist below grade.

• Framing to an imperfect foundation. Basement walls and floors are rarely square or plumb. The framing is built to accommodate that, not to fight it.
• A bedroom needs a window you can escape through. The Ontario Building Code calls it an egress window. It has to open from the inside without tools, and the actual opening has to be at least 0.35 square metres (about 3.8 square feet), with no side shorter than 380 mm (15 inches). Both numbers have to be met, so a 15 inch by 15 inch opening fails. The only way out of it is a door on that level that opens straight outside. Cutting a bigger window into a foundation wall is structural work, and it is not cheap.
• Ceiling height. Living space in a basement generally needs about 1.95 m of clearance, which is 6 ft 5 in, with a little less allowed under beams and ducts. Plenty of older homes north of the city come up short. That is when lowering the floor enters the conversation, and it changes the budget. Ask about it early, not after the framing is up.
• Fire separation and sound. A legal suite needs a fire-rated wall and ceiling between the two units, smoke alarms on every storey and in every bedroom, wired together so that one going off sets them all off, and every hole where a pipe, wire, or duct passes through sealed with a proper firestop. One unsealed hole fails the inspection.
• Electrical capacity. Add a kitchen or a second unit and an older 100 amp panel often cannot carry the load. That means upgrading the service, and it belongs in the quote before you sign, not in a change order in week six.
• Ventilation. A basement has no windows you can throw open. Heat and mechanical ventilation have to be designed for the space.

A contractor who has done twenty kitchens and one basement will learn some of this on your house.

What Ontario actually licenses, and what it does not

Most hiring advice online is written for American homeowners. It tells you to verify a state contractor licence and demand workers’ compensation coverage. Ontario does not work that way, and a homeowner following that advice ends up checking boxes that do not exist while missing the ones that do.

There is no province-wide general contractor or renovator licence in Ontario for work on an existing home. The Home Construction Regulatory Authority licenses builders and vendors of new homes under the New Home Construction Licensing Act. It does not license renovators. There is no provincial number to look up for the person finishing your basement.

What you can verify is narrower, and more useful.

A few notes on how to use that table.

Municipal licensing varies, so check your own town. Toronto requires a Building Renovator licence under Chapter 545 of its Municipal Code, including an oral trade exam and a criminal record check, and a licensed renovator there has to give you a written contract. Vaughan’s Business Licensing By-law 122-2022 requires renovators to carry at least $2 million in commercial general liability, provide a written contract with a payment schedule before taking any money, and display their licence number. Mississauga requires a trade business licence, including a written renovator exam. Smaller towns across York Region and Simcoe County vary, so look up your municipality’s business licensing page rather than assuming.

A licence is not a quality guarantee. Vaughan says so on its own consumer protection page, and it is worth repeating. A renovator licence mostly proves the business is registered, insured, and bound by consumer contract rules. It does not prove anyone can build.

Electrical is the one credential nobody can fake. In Ontario, electrical work you hire out has to be done by a Licensed Electrical Contractor holding an ECRA/ESA licence number, and that number belongs on their estimate. The contractor files a notification with the ESA, the work gets inspected, and the ESA issues a Certificate of Acceptance afterward. Keep that certificate. Your insurer and your eventual buyer will want it. If a contractor asks you to take the ESA notification out in your own name, walk. And ask who the electrician is, because a general contractor who subcontracts the electrical still has to use an LEC.

The WSIB question, answered honestly

Every generic hiring guide says never hire a contractor without WSIB coverage. In Ontario that advice is incomplete, and following it blindly will steer you away from legitimate people.

WSIB coverage has been compulsory in construction since January 1, 2013 for independent operators, sole proprietors, partners, and executive officers. There is a narrow exemption for home renovation. It applies only when all of the following are true.

• The person is an independent operator, sole proprietor, partner, or executive officer working exclusively in home renovation.
• The work is on an existing private residence.
• The person who directly hires and pays them, or a family member, lives there now or will live there.

The exemption is easy to lose. The moment that business takes a commercial contract, it is gone, and they have ten days to register.

Here is the part that matters to you. The exemption covers the person you hire directly. It does not cover the trades that person brings into your house. Subcontractors are not retained by you, so they need their own coverage, and a renovation business with employees has to register and cover them. If an uninsured worker gets hurt in your basement, there is no WSIB claim to absorb it, and the question of who pays can land on you.

So the useful question is not “do you have WSIB.” The useful questions are:

• Who is coming into my house, and are they your employees or subcontracted trades?
• Are those trades covered, and can you show me a clearance certificate?

A contractor who is registered with WSIB and in good standing can pull a clearance certificate in minutes and email it to you. Ask for it. And if a contractor cannot explain their own coverage situation clearly and calmly, that tells you something about how they run the rest of the business.

How to check a basement contractor’s insurance

General liability insurance is not a universal legal requirement to renovate in Ontario, but it is standard practice, and municipalities that licence renovators set a $2 million minimum. Ask for the certificate of insurance. Look at the coverage amount. Look at the expiry date. Then call the broker or insurer named on the certificate and confirm the policy is current, because a PDF proves nothing on its own. At Bedrock we carry $5 million in general liability, which is above the municipal minimums, and I send the certificate to anyone who asks for it.

Permits are the homeowner’s legal responsibility

Permits are required for basement work involving structural, plumbing, HVAC, or electrical changes, and always for a legal secondary suite. There is no version of this where skipping the permit is the smart play.

The part most homeowners do not know is that the permit is legally your responsibility, not the contractor’s. Section 8(1) of the Building Code Act says no person shall construct or demolish a building unless the chief building official has issued a permit for it, and you are the owner of the property. If you want the contractor to obtain the permit on your behalf, that arrangement has to be written into the contract, and you should see the permit in hand before anyone starts.

Building without one is an offence under the Building Code Act. Maximum fines run to $50,000 for a first offence by an individual and up to $500,000 for a corporation. Municipalities can issue stop-work orders and can order finished work uncovered or removed. Unpermitted work also surfaces at resale, can void insurance, and can complicate refinancing.

Three things to ask a contractor about permits, and what a good answer sounds like.

• Who prepares the drawings? Not the contractor, unless they happen to be qualified. Permit drawings have to carry the Building Code Identification Number of a registered designer, or be prepared by a licensed architect or engineer, and you can look that number up in the province’s public registry. A designer’s qualification does not cover structural work, so cutting a foundation wall for a window may need an engineer on top of that.
• How long will it take? The Building Code sets a review target of 10 business days for a complete house application, but that is a decision target on a complete submission, not a promise of approval. In practice, basement and suite permits across the GTA and York Region usually take several weeks once drawings, zoning review, and revisions are counted. A contractor promising an instant permit is either inexperienced or telling you what you want to hear.
• What happens if the permit changes the scope? For a legal suite, code requirements can move the price. A separate HVAC system is the common example.

For the record, we do not pull permits in-house, and no basement contractor should be drawing their own permit set unless they hold the qualification to do it. We work with a licensed engineer who prepares the drawings and handles the submission, and the client pays the engineer directly with no markup from us. On a legal suite I would rather have the permit approved before I give a final quote, because the code requirements are what set the price. If you want the full picture, we go deeper on our basement permits page and in our guide to whether you need a permit to finish a basement in Ontario.

How to read a basement renovation quote

If you take one thing from this article, take this. A one line quote with one number is not a quote. It is a guess with a signature line.

An itemized basement estimate breaks out every part of the job so you can see exactly what you are buying and where your money is going. No hidden fees, no “miscellaneous.”

Ontario law backs you up here. Under the Consumer Protection Act, 2002, a home renovation agreement where your total obligation is more than $50 has to be in writing. If an estimate is included in the contract, the contractor cannot charge you more than 10% above it unless you agree in writing to new or different work. If they exceed the estimate by more than 10% anyway, you can hold them to the estimated price.

When two quotes are far apart, the gap is almost always scope. The cheaper quote is usually missing something: the panel upgrade, the permit, the bathroom fixtures, the disposal bin, the HST. Put the two side by side, line by line, and ask the cheaper contractor what is not in there. Then ask what happens to the price when it turns out to be needed. Our basement cost guide walks through the pieces that actually move a basement budget.

Water gets solved before anything gets framed

Every competing article on this topic tells you to hire a contractor with waterproofing expertise. Here is the more useful version.

If your basement has an active water problem, it gets fixed before a single stud goes up. The U.S. Department of Energy’s Building America program says as much in its guidance on insulated basements: moisture management is critical in a basement, and it has to be planned for and dealt with before the space gets insulated and finished. Efflorescence on the block, standing water, damp framing, and a musty smell are all worth stopping for.

We do not offer waterproofing, and I am suspicious of any finishing contractor who is quick to tell you the water is nothing. A contractor willing to frame over a wet wall is telling you exactly who they are, because in eighteen months that problem is behind your drywall and it belongs to you. A good one tells you to deal with the water first and points you to a specialist.

How to read a portfolio and reviews properly

Ask for basements. Not renovations in general, not kitchens. Basements. Then ask for three things.

• Photos of the job in progress, not just the reveal. Anybody can stage a finished room. Framing, electrical rough-in, and insulation photos tell you how the work is actually built.
• Addresses in your own town. A contractor with real local work will have them. You can drive by, and more often than not the homeowner will talk to you.
• A job that went sideways. Ask what happened and how it was resolved. That answer is worth more than a wall of five star ratings.

When you read reviews, read past the star count and look for what people say about the process. Was the estimate accurate? Was the final invoice the same as the quote? Who did they talk to when something went wrong, and did that person answer the phone? Our project pages show the builds and our reviews page is where clients talk about the process, because the process is what I would want to read about.

Questions to ask before you sign

Who is my point of contact once the job starts, and is it the person quoting me?

At a lot of companies the person who sells you the job hands you off to a designer, then a project manager, then whoever picks up the phone. Ask who you will actually be talking to in week four. There is no wrong answer here, but there is a wrong surprise.

Who is doing the work, and have you worked with them before?

Employees or subcontracted trades, either can produce excellent work. What matters is whether the contractor has a stable crew they have used for years, or is bidding the trades out fresh on every job and meeting your electrician the same day you do.

What happens if you find something behind the wall?

An unfinished basement is predictable, because everything is visible before we start. An older finished basement is not. Demolition can turn up electrical that is not to current code, foundation cracks, or floors well out of level. A good contractor tells you that upfront and explains how a change order works. A contractor who promises there will be no surprises is guessing.

What is the deposit, and what is the payment schedule?

See the money section below. Progress payments tied to completed milestones protect you best.

What is covered by the warranty, and is it in the contract?

A verbal warranty is worth nothing. Ours is a one year workmanship warranty written into the contract, and final payment is due only once the basement is finished.

Will I see a design before you start?

You should see the space before it exists. We design every basement in 3D before anything gets framed, with multiple concepts and revisions, so nobody is discovering the layout during construction. You can see how that works on our 3D design page.

Red flags when you are hiring a basement contractor

Any one of these is worth a hard pause. Two of them and you should be calling someone else.

• A large deposit up front.
• Cash only, or an offer to skip the HST.
• No written contract.
• Pressure to sign at the table tonight.
• A quote that arrives without anyone visiting the house.
• Vagueness about permits, or an offer to “keep it simple.”
• No proof of insurance, or a certificate they will not let you verify.
• Reluctance to give you addresses of past basements.
• Willingness to frame over a wet wall.

Contracts, deposits, and the lien risk nobody mentions

Get it in writing. The contract should spell out the scope, the timeline, the materials and allowances, the payment schedule, and the warranty. Ontario law already requires a written contract for any home renovation agreement over $50.

You have a cooling-off period. Under the Consumer Protection Act, 2002, a renovation contract worth $50 or more that you sign in your own home is a “direct agreement,” and you can cancel it for any reason within 10 calendar days of receiving your written copy. If you asked them to start during that window you may owe reasonable compensation for the work already done, but the right is yours. If you never received a proper copy of the contract, you may be able to cancel for up to a year.

Keep the deposit small. Ontario’s guidance is a down payment of no more than 10% of the project cost, and never paying in full before the work is done. The Canadian Home Builders’ Association says the same, with an exception for custom, non-returnable materials that have to be paid for up front.

Then there is the one almost no hiring guide mentions. Under Ontario’s Construction Act, anyone who supplies labour or materials to your project can register a lien against your property if they do not get paid. That includes your contractor’s trades and suppliers. So if you pay the contractor in full and the contractor does not pay the electrician, the electrician can put a lien on your house, and you can end up paying for the same work twice.

That is why the law tells you to keep 10% of the money back as the work goes in, and to sit on it until the window for filing a lien has closed. That window is 60 days. Older guides still say 45 days, which has been wrong since 2018.

How you protect yourself:

• Hold the 10% statutory holdback, and do not release it early just because the space looks finished.
• Before releasing money, ask for evidence that the trades and suppliers have been paid.
• Hire a contractor who pays their own trades and keeps a clean paper trail, and ask them directly how they handle the holdback.

You can also search the contractor’s business name and the owner’s personal name on Ontario’s Consumer Beware List, which is free and public. Search both, because operators sometimes run more than one business.

Owner-operator or larger company: what each one costs you

There is no single right answer here, so here is the honest comparison.

I run Bedrock the second way. I do the consultation, I write the quote, I build the 3D design in SketchUp, and I coordinate the trades on site, so the person you meet at the estimate is the person who walks you through the finished basement. I use many of the same trades and suppliers the big showroom companies use, because after this long in the trade I know who does good work and I keep hiring them.

The honest trade-off is capacity. I take on fewer basements at a time, which means my calendar is tighter than a company running three crews. Quality, not quantity, is the whole point of the model, but it does mean you may wait for a start date. That is the deal, and I would rather you know it going in. Our process page lays out how a project actually runs.

Frequently asked questions

How many quotes should I get for a basement renovation?

Three is the standard advice and it holds up, as long as you compare them line by line rather than by the number at the bottom. Two itemized quotes will tell you more than five lump sums.

How much of a deposit should I pay a basement contractor in Ontario?

Ontario’s guidance is no more than 10% of the total project cost, with progress payments tied to completed work after that. Never pay the full amount before the job is done.

Does a basement contractor need a licence in Ontario?

There is no provincial renovator licence. Some municipalities, including Toronto, Vaughan, and Mississauga, require a renovator or trade business licence. The electrician on your job must be a Licensed Electrical Contractor, and electricians, plumbers, and HVAC mechanics are compulsory trades that require certification.

Who pulls the permit for a basement renovation?

The permit is legally the homeowner’s responsibility. A contractor can manage the process for you, but that has to be written into the contract, and the drawings must come from a BCIN-qualified designer or a licensed engineer.

What should be included in a basement renovation quote?

Demolition, framing, insulation, electrical (including pot lights and any panel upgrade), plumbing, HVAC, drywall and taping, doors and trim, flooring, bathroom fixtures with named allowances, permits and engineering shown separately, and HST. If a line is missing, it is not free. It is just not in the quote yet.

Do I need a permit for a legal basement apartment?

Yes, always. A legal secondary suite requires a building permit and full Ontario Building Code compliance, including fire separation, egress, and interconnected alarms. We cover the requirements in detail on our basement apartment page and in our guide to legal basement apartments in Ontario.

Get an itemized quote and compare it line by line

Run these checks on every contractor you are considering, and that includes us. Ask for the insurance certificate. Ask who the electrician is. Ask what is not in the quote.

If you want ours in the pile, I will come out to the house for free, look at the space, and give you a ballpark on the spot. A fully itemized written estimate follows by email, with no obligation and nobody chasing you afterward. You can book a basement estimate here.