In Ottawa, a plumbing permit is required for: installing new plumbing fixtures (toilet, sink, shower, bathtub), relocating existing plumbing fixtures, adding or modifying drain/waste/vent piping, adding or modifying water supply piping, installing a new water heater, connecting a dishwasher or washing machine to new plumbing, installing a backwater valve or sump pump, and any plumbing work in new construction or additions.
In Ottawa, a plumbing permit is required for: installing new plumbing fixtures (toilet, sink, shower, bathtub), relocating existing plumbing fixtures, adding or modifying drain/waste/vent piping, adding or modifying water supply piping, installing a new water heater, connecting a dishwasher or washing machine to new plumbing, installing a backwater valve or sump pump, and any plumbing work in new construction or additions. Work that typically does NOT require a permit: replacing a faucet (same fixture, same location), replacing a toilet (same location), replacing a water heater with the same type in the same location (some jurisdictions vary), and fixing a leak on existing piping. Plumbing permits in Ottawa cost $200–$500 depending on the number of fixtures and project scope.
Ontario law requires that plumbing work be performed by a licensed plumber. Unlike electrical work, there is no homeowner exemption for plumbing in Ontario. All plumbing work requiring a permit must be done by a plumber with a Certificate of Qualification from the Ontario College of Trades. When hiring a plumber in Ottawa, verify: their Certificate of Qualification, that they obtain the necessary plumbing permit, that they schedule required inspections, and that they carry WSIB coverage and liability insurance. For renovation projects managed by a general contractor, the GC typically hires a licensed plumbing subcontractor. Ask your GC to confirm that their plumber is licensed and that the plumbing permit will be obtained.
Bathroom renovation with fixture relocation: $3,000–$6,000 for plumbing (plus permit). Moving a toilet, relocating the shower, or adding a second sink all require permits. Kitchen renovation plumbing: $1,500–$4,000 plus permit. Relocating the sink, adding a pot filler, connecting a dishwasher to new plumbing, or adding a prep sink to an island all require permits. Basement bathroom addition: $4,000–$8,000 plus permit. This is one of the most common plumbing permit projects in Ottawa. Connecting to the existing drain stack is the most cost-effective approach. Backwater valve installation: $1,500–$3,000 plus permit. Ottawa strongly recommends backwater valves to prevent sewer backup. Some insurance companies offer premium discounts for homes with backwater valves. Water heater replacement (different type or location): $1,000–$3,000 plus permit. Switching from a tank to tankless water heater, or relocating the water heater, requires a permit.
Plumbing inspections in Ottawa are conducted by City of Ottawa building inspectors. The typical inspection process: Rough-in inspection: After plumbing pipes are installed but before walls are closed up. The inspector verifies pipe sizing, slope, venting, materials, and connections. This inspection is critical — if rough-in work is covered by drywall before inspection, the inspector may require walls to be opened. Final inspection: After all fixtures are installed and connected. The inspector verifies proper fixture installation, leak-free connections, proper venting, and backflow prevention. Schedule inspections through the City of Ottawa inspection line. Provide 48–72 hours notice. Ensure the work area is accessible and well-lit for the inspector. Common inspection failures: inadequate pipe slope (drain pipes need 1/4 inch per foot minimum slope), missing or improper venting (every fixture needs proper venting to prevent drain problems), incompatible pipe materials (mixing pipe types incorrectly), and missing cleanouts (required for drain access and maintenance).
Permit fees: $200–$500 based on the number of fixtures and project scope. Application processing takes 1–2 weeks. Typical renovation plumbing timeline: permit application and approval (1–2 weeks), rough-in plumbing installation (2–5 days depending on scope), rough-in inspection (schedule 48–72 hours in advance), drywall and finishing (after rough-in passes inspection), fixture installation (1–2 days), and final inspection (schedule 48–72 hours in advance). Total plumbing timeline within a renovation: 3–6 weeks from rough-in to final inspection, interspersed with other renovation work. Budget the plumbing permit as a standard project cost. Your plumber's quote should include permit fees and inspection coordination. If it doesn't, ask why — skipping the plumbing permit creates the same risks as skipping any other permit.
If you're replacing a toilet in the same location with a similar fixture, no permit is typically required. If you're relocating the toilet, adding a new toilet, or changing the drain connection, a plumbing permit is required.
No. Unlike electrical work, Ontario does not have a homeowner exemption for plumbing. All permitted plumbing work must be performed by a licensed plumber with a Certificate of Qualification.
Plumbing permits cost $200–$500 depending on the number of fixtures and project scope. Your licensed plumber should include permit costs and inspection coordination in their quote.
The inspector provides a list of deficiencies. Your plumber corrects the issues and schedules a re-inspection. Common failures include improper pipe slope, missing venting, and incompatible materials.
While not universally mandatory, Ottawa strongly recommends backwater valves. Many insurance companies require them or offer premium discounts. A backwater valve costs $1,500–$3,000 installed and prevents costly sewer backups.