1-Tom-Plumber
PlumbingCambridge
Checking owner claim…Phone and website on file
How to Hire a Plumbing Contractor in Ontario
Plumbing is a compulsory trade in Ontario — it's illegal to hire an unlicensed plumber. The Ontario College of Trades (now Skilled Trades Ontario) oversees licensing. Always verify your plumber's 306A licence before work begins.
This selection shows 3 businesses. Confirm that a business offers what you need.
1-Tom-Plumber
PlumbingMilton
Checking owner claim…Phone and website on file
17 Plumbing & Construction Design Ltd
PlumbingOakville
Checking owner claim…Phone and website on file
Check the qualifications that matter for your work
Ask what qualifications, insurance and approvals are relevant to your particular job. Verify the details with the issuing organisation. Being listed here is not a licence check or an endorsement.
Open the existing verification resourceWhen to Hire a Plumbing Contractor
- Your water heater is over 10 years old or leaking
- You have recurring drain clogs or slow drains
- You notice water stains on ceilings or walls
- Your water pressure has dropped significantly
- You're renovating a kitchen or bathroom
- You smell sewer gas in your home
- Your water bill has spiked unexpectedly (possible hidden leak)
Timeline: Simple repairs take 1-4 hours. Water heater replacement is typically same-day. Bathroom rough-in takes 2-3 days. Full bathroom renovation plumbing takes 3-5 days.
Plumbing Costs in Ontario (2026)
Water Heater$1,200 — $3,500
installed
Bathroom Rough In$3,000 — $8,000
complete
Drain Cleaning$150 — $500
per service
Pipe Repair$200 — $2,000
per repair
Prices are approximate for Ontario (CAD). Actual costs vary by city, scope, and season. Always get 3 written quotes.
Questions to Ask Before Hiring
- 1What is your Ontario plumbing licence number (306A)?
- 2Do you carry WSIB coverage?
- 3Will you pull the required plumbing permit?
- 4What is your hourly rate vs. flat rate for this job?
- 5Do you offer emergency/after-hours service?
- 6What is the warranty on your work?
- 7Do you provide camera inspection before recommending repairs?
Red Flags — When to Walk Away
- No license number
- Won't pull permits
- No WSIB
- No written quote
Homeowner Checklist — Before You Hire
- Get at least 3 written quotes for comparison
- Verify WSIB clearance certificate (protects YOU from liability)
- Check Google reviews AND ask for local references
- Confirm they will pull all required permits
- Never pay more than 10-15% deposit upfront
- Get everything in writing — scope, timeline, payment schedule
- Verify their business insurance is current
- For regulated trades (electrical, plumbing, gas), verify their license number
Payment: 10-15% deposit, progress payments tied to milestones, 10% holdback until completion. Ontario's Construction Act provides a 10% holdback right on construction projects.
Best Time to Hire a Plumbing Contractor
springMarch — May
Spring is peak booking season. Contact contractors in February for the best availability.
summerJune — August
Summer is the busiest season. Prices are highest and wait times longest. Book early.
fallSeptember — November
Fall is the sweet spot — contractors are less busy, prices drop, and you prepare for winter.
winterDecember — FebruaryRelevant
Winter is off-season for exterior work. Interior renovations get the best prices and fastest timelines.
How to Verify a Plumbing Contractor in Ontario
WSIB Safety Check
Free online tool to verify any contractor's WSIB coverage status.
Workplace Safety and Insurance Board (WSIB)
Verify contractor WSIB coverage before hiring — protects you from liability
Skilled Trades Ontario
Trade certification and public register. Verify compulsory trade certifications (plumber, electrician, etc.).
Consumer Beware List
Searchable list of businesses with unresolved consumer complaints in Ontario.
Frequently Asked Questions — Hiring a Plumbing in Ontario
- How are listings ordered?
- Owner-claimed listings come first, then profile completeness and name. Sponsored placements are labelled and do not change the organic order.
- Does a listing mean NSO endorses a business?
- No. Check that the business offers what you need. Ask about relevant qualifications, insurance and licensing, and confirm those details with the business or issuing organisation.
- How do I compare options?
- Read the recorded business details, ask about availability and request a quote for your actual requirements. Confirm the scope and price before booking.
- What if a business is missing or its details are wrong?
- Use Add a missing business or Claim an existing listing. These are reviewed requests; they do not automatically publish a record or verify ownership.
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Ready to Find a Plumbing Contractor?
Browse 374 listed plumbing contractors in our directory. Read the recorded business details and confirm your requirements.