How to Choose a General Contractor in Ontario: What Cambridge Homeowners Should Know
The contractor you hire determines the outcome of your renovation more than any other single factor. Not the materials, not the design, not the budget. The contractor. A skilled GC with a structured process delivers a predictable project. An unqualified one, regardless of how confident they sound on the phone, delivers chaos that costs you money, time, and sometimes structural problems you will be living with for years.
Cambridge homeowners are in the same position as anyone else in Ontario when it comes to choosing a contractor: the licensing requirements are minimal, the good operators and the bad ones look identical on a website, and the lowest bid almost always looks attractive in the moment. This guide gives you the tools to tell them apart before you sign anything.
What a General Contractor Actually Does
A general contractor is not just another tradesperson. A GC manages the entire project: pulls the permits, hires and coordinates all subtrades, owns the project timeline, and is accountable for the outcome from demolition through final inspection. When you hire a GC, you are buying a single point of contact and a single point of accountability for everything that happens on your property.
In practical terms, this means the GC is the person who knows when the framing inspection is scheduled and has the plumber ready to rough in the week after. The person who catches a structural issue during demolition and has a solution and a revised budget to you within 24 hours. The person whose name is on the permit and who is legally responsible for the work meeting Ontario Building Code requirements.
When homeowners manage trades themselves instead of hiring a GC, they take on all of that coordination, without the experience, the trade relationships, or the knowledge of how projects sequence. Most renovation disasters, the ones that end in incomplete work, blown budgets, and legal disputes, come from homeowners managing multiple trades on a project that needed a GC.
Six Red Flags to Walk Away From
These are not edge cases. Every one of these is common enough in the Ontario renovation market that knowing them could save you from a project that goes seriously wrong.
No written contract
A legitimate renovation contractor provides a written contract before work begins. The contract should specify the full scope of work, the payment schedule, the timeline, what is and is not included, and how changes will be handled. A contractor who works on a handshake is telling you that accountability is not part of how they operate.
No permit pulled
If a contractor tells you a permit is not required for work that clearly requires one, a home addition, a basement conversion, structural changes, new plumbing or electrical, they are either uninformed or deliberately avoiding the oversight that comes with the permit process. Work done without a required permit is illegal in Ontario, is not inspected, creates a disclosure obligation when you sell, and can result in orders to remove the work at your cost.
Cash discount for no receipt
A significant cash discount offered in exchange for no paper trail has one purpose: to avoid HST remittance, WSIB premiums, and income tax. This is tax evasion, and it is not something you want to be entangled in as the property owner. If an incident occurs on site and the contractor has no WSIB coverage, you can be held liable as the home owner. No legitimate contractor operates this way.
No WSIB coverage
In Ontario, contractors working on your property must have either active WSIB (Workplace Safety and Insurance Board) coverage or be classified as an independent operator exempt from coverage requirements. If a worker is injured on your property and the contractor cannot produce a valid WSIB clearance certificate, you can be held responsible for the costs. Always ask for a current clearance certificate before work starts. You can verify it yourself at the WSIB website.
Vague scope of work
A quote that says "kitchen renovation: labour and materials" with a single number tells you nothing. A legitimate contractor provides an itemized scope: what demolition is included, what trades are covered, what materials are supplied, what the allowances are for selections not yet made, and what explicitly is excluded. Vague scope is how significant costs get added mid-project without warning.
Lowest bid by a wide margin
If one quote is $40,000 lower than two others for the same apparent scope, that gap has to come from somewhere. Either the low bidder has excluded scope items the others included, is planning to use cheaper materials and labour than specified, or is pricing without adequate contingency and will be back for more money once they are too far in to walk away from. Three quotes on the same project should be within a reasonable range. When one is an outlier, ask exactly what it does not include.
Five Questions to Ask Before You Hire
These are not trick questions. A legitimate, experienced GC has straightforward answers to all of them. The answers tell you more about how a contractor operates than any website or portfolio.
Are you licensed and insured in Ontario, and can I see proof?
Ontario does not have a province-wide mandatory licensing requirement for general contractors, but a legitimate operator carries general liability insurance (minimum $2 million is standard), active WSIB coverage or a valid exemption, and operates as a registered business. Ask for proof of insurance and WSIB, and verify both. If a contractor hesitates or cannot produce these, move on.
Will you pull the permits, and what does that process look like for my project?
The answer should be yes, and the contractor should be able to tell you what permits are required, roughly how long the City of Cambridge processes them, and what inspections will be required during construction. A contractor who is unfamiliar with the permit process for your project type, or who suggests you pull the permits yourself to save money, is telling you something important about their experience level and their accountability.
How do you handle surprises or hidden conditions that change the scope mid-project?
This is where good and bad contractors separate clearly. A legitimate answer involves same-day disclosure of any unexpected condition found during demolition, a written Change Order documenting the change in scope and cost before any additional work proceeds, and a clear explanation of why the change is required. Any answer that involves verbal agreements, approximate costs settled up at the end, or a contractor who seems annoyed by the question should end the conversation.
Who will be on site managing the work day to day?
On a well-run project, the GC or a named site supervisor is present daily. If the answer is that the GC shows up occasionally and the subtrades are largely unsupervised, the timeline and quality control on your project are at risk. Trade coordination is where projects fall apart. The framing is not ready when the electrician arrives, the plumber and the HVAC trade are trying to run pipes through the same chase, the drywall goes up before someone checks that all rough-in inspections have passed. Day-to-day site management prevents all of these.
Can you provide references from completed projects similar to mine?
Not a list of five-star Google reviews. References from specific homeowners on projects of comparable scope, who you can call and ask real questions. How was communication when something went wrong? Was the project completed on schedule? Was the final cost close to the original contract? If a contractor cannot provide this, or produces references only for small jobs when you are asking about a major renovation, that tells you something.
What the Complete Renovation Standard Answers
Every question above has a structural answer built into how BB Carpentry operates. The Complete Renovation Standard is the documented framework that governs every project we take on, and it exists precisely because these are not questions that should depend on a contractor's mood or memory on a given day.
On scope: no project starts construction until every decision that can be made in advance has been made. The planning phase surfaces unknowns, resolves assumptions, and produces a contract that reflects the actual project, instead of just an optimistic version of it.
On surprises: under the Communication pillar of the CRS, any hidden condition discovered during construction is disclosed the same day it is found, alongside a proposed solution and a written Change Order documenting the cost impact before any additional work proceeds. Verbal agreements do not move scope forward on a CRS project.
On permits: we pull every permit required for every project we take on. The City of Cambridge building department, the permit timeline, and the inspection sequence are not new territory for us.
On accountability: Brad Bonnell Carpentry manages every project on site. Not a site supervisor hired for the job. That is what one point of contact and one point of accountability actually means in practice.
The full framework is at the link below. Reading it takes about ten minutes and will tell you more about how we operate than any sales conversation.
Does a general contractor need to be licensed in Ontario?
Ontario does not have a mandatory province-wide licensing requirement for general contractors, unlike some other Canadian provinces. However, a legitimate GC carries general liability insurance, active WSIB coverage or a valid exemption, and operates as a registered business. Electricians and plumbers working under a GC must hold valid trade certificates under the Ontario College of Trades. Always verify insurance and WSIB coverage before any work begins on your property.
What is the difference between a GC and a subcontractor?
A general contractor manages the overall project: pulling permits, hiring and coordinating subtrades, owning the timeline, and being accountable for the outcome. Subcontractors are the individual tradespeople: framers, electricians, plumbers, drywallers, tilers. Those who complete specific scopes under the GC's direction. When you hire a GC, you have one contract and one point of accountability. When you hire subtrades directly, you become the de facto GC and take on all the coordination and liability that comes with that role.
How do I verify a contractor's WSIB coverage in Ontario?
You can verify a contractor's WSIB clearance certificate directly at the WSIB website (wsib.ca) using the contractor's business name or account number. A valid clearance certificate confirms the contractor's account is in good standing at the time of the search. Clearance certificates expire, so verify at the start of the project rather than relying on a certificate the contractor provided during the quote process.
Ready to hire a contractor
you can actually trust?
Planning calls are free and take about 20 minutes. Brad will give you a straight read on your project — scope, timeline, and realistic cost — and answer every question on this list directly. No sales pitch.
Cambridge • Kitchener • Waterloo • Licensed GC • Insured
