Glossary
Renovation Glossary for Ontario Homeowners
Plain-language definitions of the renovation and construction terms Ontario homeowners actually run into — from allowance and change order to WSIB, ESA, egress, and holdback — so you can read a quote and talk to a contractor with confidence.
HomeCopilot Editorial
Renovations come with a vocabulary of their own, and contractors use it as shorthand. Here are the terms Ontario homeowners actually run into on a quote or a job site, in plain language — so you can read the paperwork, ask better questions, and never nod along to a word you did not follow. For deeper dives, we have linked our full guides where they fit.
Money & contract terms
| Term | What it means |
|---|---|
| Allowance | A dollar amount the contractor budgets for something you have not chosen yet (tile, fixtures). If your real choice costs more, you pay the difference. |
| Change order | A written, agreed change to the scope and price during the job — the proper way a surprise or a new request gets handled. |
| Cost-plus | A pricing model where you pay the actual cost of labour and materials plus a set fee or percentage, rather than one fixed price. |
| Fixed price | A single agreed price for a defined scope; the contractor absorbs overruns within that scope. |
| Holdback | A portion of payment kept back until the work is complete and the lien period passes, as protection. Ontario construction law has specific holdback rules. |
| Deposit | An up-front payment to secure a start date and order materials. A modest deposit is normal; a large one is a warning sign. |
| Draw / progress payment | A payment released as a defined milestone is completed, so money follows progress. |
Trades, permits & compliance
| Term | What it means |
|---|---|
| Building permit | Municipal approval required for many structural, plumbing, and electrical changes; comes with inspections. Issued by your local municipality. |
| ESA | The Electrical Safety Authority — regulates electrical work in Ontario. Electrical work must be done by an ECRA/ESA-licensed contractor and is inspected. |
| WSIB | The Workplace Safety and Insurance Board — workplace-injury coverage. Ask a contractor for a current Clearance Certificate. |
| TSSA | The Technical Standards and Safety Authority — oversees gas and fuel work; gas appliances need a TSSA-registered technician. |
| Egress | A code-required exit — for example, a basement bedroom needs an egress window large enough to escape through. |
| Load-bearing wall | A wall that carries weight from above; removing one needs engineering and a permit, unlike a non-structural partition. |
| Ontario Building Code | The provincial code that sets minimum construction standards; municipalities enforce it through permits and inspections. |
Construction & materials
| Term | What it means |
|---|---|
| Rough-in | The first stage of plumbing, electrical, or HVAC — running lines and boxes inside walls before they are closed up and inspected. |
| Subfloor | The structural layer beneath your finished floor; its condition drives flooring cost and is often the hidden surprise. |
| Vapour barrier | A layer that controls moisture movement through walls and ceilings — critical in Ontario basements and exterior walls. |
| Waterproofing membrane | A sealing layer behind tile in showers and on floors that stops water reaching the structure. |
| R-value | A measure of insulation's resistance to heat flow; higher R-value means better insulation. |
| Punch list | The final list of small fixes and touch-ups completed before a project is signed off. |
| Efflorescence | White, chalky residue left on concrete as water passes through it — an early sign of a basement moisture issue. |
Keep reading
- How to read a renovation quote — allowances, exclusions, and comparing fairly.
- Renovation contracts in Ontario — what to get in writing before you sign.
- How to hire a renovation contractor in the GTA — vetting WSIB, insurance, and licences.
- Signs of basement water problems — spotting efflorescence and moisture early.
FAQ
What is an allowance versus a change order?
An allowance is money budgeted up front for an item you have not chosen yet, like tile — if your pick costs more, you pay the gap. A change order is a written, agreed adjustment to scope and price made during the job. Both are normal; both should always be in writing.
What is the difference between the ESA, WSIB, and TSSA?
They govern different things: the ESA regulates electrical work and licensing, WSIB provides workplace-injury coverage for workers, and the TSSA oversees gas and fuel safety. When hiring, you confirm the relevant one — an ESA-licensed electrician, WSIB coverage for the crew, a TSSA-registered gas technician.
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