Contracts, clearances and permits
Hiring a renovation contractor in Ottawa: the four things to settle first
Most advice about hiring a contractor is about judgement. These four are not. They are rules with published sources, and one of them is the opposite of what contractor websites usually tell homeowners.
The WSIB clearance rule, and the exemption nobody quotes
In construction, a WSIB clearance normally has to be in place before work begins and for the whole duration, and going ahead without one is an offence committed by both the contractor and whoever hired them. A contractor who hires a subcontractor becomes the principal to that sub and needs a clearance from them too.
The exemption is the part that gets left out. The WSIB states that if a contractor or subcontractor is hired to do home repairs or renovations by a home's resident, occupant or a member of their family, then a clearance certificate is not required. So a homeowner renovating their own home is not legally obliged to collect one, whatever a quote implies.
It is still worth asking for, because a clearance shows the business is registered and up to date with the WSIB, and clearances cost nothing. They are valid for up to 90 days and most expire on the twentieth of February, May, August and November, so a certificate handed over in January does not cover a job running into the spring.
The estimate becomes a ceiling once it is in the contract
Under Ontario's consumer protection rules, where a written estimate is included in the contract the final price cannot be more than ten per cent above it, unless you agree to a new price and sign a change to the contract. That is a legal limit, not a negotiating position, and it only exists if the estimate is actually in the contract.
If you negotiate and sign in your home it is a direct agreement, and you can cancel within ten days of receiving a written copy without giving a reason. Where a delivery or completion date is specified, the business has 30 days from that date to perform before you can cancel; where none is given, 30 days from signing.
The permit is yours as much as theirs
The City of Ottawa is unambiguous: it is the owner's responsibility to ensure a building permit is obtained when required, and both the owner and the builder are responsible for the process and equally liable under the Ontario Building Code Act. You can authorise a contractor to apply, but you should confirm the permit exists before work starts.
An issued permit must be posted visibly on site for the duration of construction. Construction has to seriously commence within six months of issue or the permit can be revoked, and a job substantially suspended for more than a year can lose it. If you suspect work nearby is proceeding without one, the City takes a Request for Service through 3-1-1 and gives a reference number.
The trades your contractor cannot cover with their own crew
- Electrical. Only a Licensed Electrical Contractor may be hired to do electrical work, and the Electrical Safety Authority states that general contractors are not licensed to do it. Ask which licensed contractor is filing the notification of work.
- Gas. Work on gas appliances and lines belongs to a certified technician employed by a contractor registered with the Technical Standards and Safety Authority.
- Plumbing. Plumber is a compulsory trade in Ontario and the certificate is on the Skilled Trades Ontario Public Register.
None of this tells you whether a contractor is good. It tells you whether the structure behind the quote is real, which is the part you can verify before signing.
What not to say to a general contractor
Each of these, agreed to at the quoting stage, gives up a protection you would otherwise have.
- That cash is fine without a receipt. The Canada Revenue Agency tells customers to avoid businesses that promise lower prices for cash with no receipt. It advises hiring home contracting businesses that give you a written contract, to protect yourself against incomplete or poor-quality work and cost overruns.
- That the job will not need a permit, before anyone has checked. The City of Ottawa's exempt list includes new flooring, replacing doors or windows in the same size opening, and replacing kitchen or bathroom cabinets while the plumbing fixtures stay put. Work outside that list falls under the permit rules above, where the owner shares the liability, and a designated heritage building gets no exemptions.
- That a ballpark figure will do. Only a written estimate included in the contract holds the final price to ten per cent above it, as the contract section above explains.
We compare kitchen and bath renovators on a separate page, with a list of what to avoid on a bathroom renovation in Ottawa.
Sources, checked 2026-09-18 unless marked:
Before you hire
What should you check before hiring a general contractor in Ottawa?
Ontario requires a written contract above a set value for home renovation work and limits how far a final price may exceed a written estimate. Consumer Protection Ontario publishes those rules along with guidance on deposits.
Ottawa Service Directory is a listings site, not a regulator: we publish what a business reports about itself, so confirm what applies to your job with the source below and with the business before work starts.
Source: Consumer Protection Ontario: your rights when starting home renovations or repairs. Checked 2026-08-24. Rules and thresholds change, so confirm before work starts.