Most renovation stories that end badly did not go wrong on site. They went wrong at the quoting stage, when a homeowner picked a contractor on price and a handshake and found out four weeks later what the number had left out.
The frustrating part is that Ontario already hands you most of the tools to avoid it. There are written rules about estimates, deposits and cancellation that a lot of homeowners have never heard of, and there are two or three checks that take ten minutes and rule out most of the operators you would not want in your house. Here is the whole list.
Start by reading where the quotes disagree
Ontario’s consumer guidance recommends getting at least three written estimates. Nearly everyone treats that as a price-shopping exercise. It is more useful as a comprehension test.
Line the three up and look at where they differ. If two quotes include removing and rebuilding a bulkhead and the third does not mention it, the third contractor either found a better way or has not looked up. If one quote carries an allowance for electrical upgrades and the others are silent, that is not a contractor being expensive. That is a contractor who has seen your panel.
The cheapest quote is very often the one that has understood the job least. That gap does not disappear when the work starts. It reappears as a change order.
The 10% rule almost nobody knows about
This is the single most useful thing on this page. Under Ontario’s consumer protection rules, the final price cannot be more than 10% over the original estimate unless you have agreed to new work or a new price (Ontario.ca).
That reframes the whole quoting conversation. An estimate is not a rough guess that a contractor can drift away from. It is a number with a legal ceiling attached, which is exactly why a good contractor spends real time on it and a careless one does not.
It also tells you what to do when scope changes mid-project, which it sometimes legitimately does once a wall is open. Agree the new number in writing, before it is built. Not after. A verbal approval shouted over a compressor is not something you want to be arguing about in October.
What has to be in the contract
Any Ontario home renovation contract over $50 has to be in writing, and Ontario.ca sets out what it must contain:
- The contractor’s name, address and contact details
- A thorough description of the work and the materials
- Warranty terms
- Total cost and payment terms
- A work schedule with start and completion dates
- The payment schedule and the deposit amount
- Who is responsible for cleanup
- All subcontractors involved
Read that list against the last quote you were sent. Most of what homeowners call a quote in this city is a price and a paragraph. If start and completion dates are missing, there is nothing to hold anyone to, and “we’ll get to it in the spring” becomes a permanent condition.
Deposits: 10%, not 50%
Ontario’s guidance recommends a down payment of no more than 10%, and never paying the full amount before the work is finished.
A deposit covers materials ordering and scheduling commitment. It is not supposed to fund the contractor’s payroll on somebody else’s job. When a residential renovation contractor wants half the contract value before anything happens, they are asking you to carry their cash-flow risk without paying you for it, and the homeowners who lose money in this trade almost always lost it this way.
Progress payments tied to completed stages are the normal, healthy structure. Money moves when work is on the ground.
Your 10-day cancellation right
If you signed the contract in your home and it is worth $50 or more, you have a 10 calendar-day cooling-off period and can cancel for any reason without a cancellation fee. You can still owe reasonable compensation for work that has already been done, which is the argument for using the right early rather than late.
This exists for a reason. High-pressure closing at a kitchen table is a recognised problem in this trade. Any contractor who needs a signature tonight, before a discount expires, is telling you something about how they operate. A real quote is still a real quote next Tuesday.
The four checks that take ten minutes
WSIB coverage. Ask for a clearance certificate. If an uninsured worker is hurt on your property, you do not want to discover the coverage question at that moment.
Liability insurance. Ask for the certificate, and check that the coverage amount is proportionate to the work. A basement gut is not a $1,000 exposure.
The Ottawa hardscaping licence. Since March 1, 2026 the City has required contractors doing driveways, walkways, patios, retaining walls and steps to hold a municipal Hardscaping Contractor licence. Council approved the by-law on October 22, 2025. If your project has an exterior component, ask to see the licence. We hold an active one.
Electrical. Any electrical work needs an ECRA/ESA licensed contractor. There is no informal version of this that ends well.
Ontario also publishes a Consumer Beware List worth searching before you sign.
Who is actually running the job
The question that predicts your experience better than any credential: who is on site, and who do you call?
Renovation work legitimately involves multiple trades. The question is whether someone is coordinating them or whether you are. When a homeowner ends up phoning the tiler to find out why the plumber has not been, the general contractor role has quietly been transferred to the homeowner, unpaid.
There is a related question about permits. Interior work that moves plumbing, alters structure or finishes a basement usually needs a City of Ottawa building permit, and a basement bedroom brings egress requirements with it. We cover that in detail in our Barrhaven basement guide and the backyard permit thresholds post. Establish early whether the contractor is pulling the permit or expecting you to.
What to expect from us
We quote fixed price rather than time and materials, we run our own crews, and one person stays your point of contact from the first site visit to the last inspection. You can see the range of work on our interior renovations and hardscaping pages, and the gallery is our own completed projects rather than supplier stock photography.
If you are at the three-quotes stage, we are happy to be one of them, and happy to tell you when a scope does not need what somebody else has quoted. Book a free on-site assessment and we will put a real number on it.
Published August 24, 2026 by ALM Construction & Landscaping. General information for Ottawa-area homeowners, not a substitute for the City's determination on your specific project.