Hiring a deck contractor in the GTA

Where to find candidates

The honest answer is that the best GTA deck contractors are booked through word-of-mouth two to four months in advance. Failing that, the working list of sources, ranked by quality:

1. Direct referral from a neighbour with a deck you’ve stood on. Walks-on-it confidence is hard to substitute. Ask how the contractor handled the permit, change-orders, and the one thing that went wrong.
2. Composite manufacturer pro lists— Trex Pro, TimberTech Pro, AZEK’s contractor finder. These are paid listings but they require warranty-compliant install training, so the floor is higher than open directories.
3. Lumber yard recommendations — Hamilton Building Supplies, Beaver Lumber, Lansing — the staff know which crews show up reliably and pay their accounts.
4. HomeStars and Houzz reviews.Useful for elimination, weak for selection. A 4.8-star contractor with 200 reviews is probably fine; a 5-star contractor with 8 reviews could be either excellent or someone’s cousin.
5. Facebook neighbourhood groups. Surprisingly useful for negative signals (the contractor everyone tells you to avoid). Less useful for picking.

The vetting pass — what to verify before signing

Five items, all verifiable in under an hour:

1. WSIB clearance certificate.The Workplace Safety and Insurance Board provides free online clearance verification. If the contractor isn’t WSIB-current, a worker injured on your property could leave you liable. Always ask. Always verify against the WSIB online tool, not just a photocopied certificate.
2. Commercial general liability insurance, minimum $2 million. Ask for a Certificate of Insurance naming you as additional insured for the project duration. A real broker can issue one in a day. A contractor who can’t produce one in a week is either uninsured or has a relationship problem with their broker — both bad signals.
3. HST registration / business number.Any contractor billing over $30,000 a year is required to be HST-registered. If they’re offering an “HST-free” deal in cash, either they’re running undeclared income (your problem if the CRA asks) or they’re below the threshold (which is a scale concern). Either way, the “save on HST” pitch is a red flag, not a discount.
4. References — two completed in the last 24 months. Ask for the addresses, drive past, knock on the door, ask the owner two questions: would you hire them again, and what surprised you. The driving past is the part that actually works.
5. Permit history. Some municipalities (Toronto, Hamilton) publish permit data by contractor. A contractor who claims to do twenty decks a year but has filed three permits in three years is doing eighty-five percent of their work under the table. Not necessarily a deal-breaker, but priced accordingly and quoted with that pattern in mind.

Reading the contract — what should be in it

A working deck contract in Ontario should fit on three pages, plus the drawing set as an appendix. Anything shorter is missing protections; anything longer is usually adding clauses that protect the contractor more than you.

Required clauses, in plain language:

• Scope of work, item by item. Demolition (yes/no), permit (who pays, who applies), excavation, footings, framing, decking, railing, stairs, site cleanup, final disposal. Each line has a price or is rolled into a stated subtotal.
• Materials specification, by name and grade. “Trex Transcend Tropical, Spiced Rum colour, 5/4 × 6 × 16, installed with TrexHideaway hidden fasteners on 12″ OC PT joists” — not “composite decking.” You should be able to take the contract to the lumber yard and place the order yourself.
• Schedule. Start date, working-days estimate, intended completion. Weather contingency is reasonable; an open-ended schedule is not.
• Payment schedule. Deposit on signing, progress payments tied to specific milestones, final payment after inspection. See below.
• Change-order clause. All scope changes in writing and counter-signed before work proceeds. This is the single most common dispute trigger; document the process before you need it.
• Warranty.Minimum one year on workmanship, the materials manufacturer’s warranty on the boards (transferred to you in writing). Anything “lifetime” without definition is marketing copy, not warranty.
• Permit responsibility. Who applies, who pays the fee, who passes the inspections. The contractor should be the named applicant — that puts code compliance on them, not on you.

Payment schedule norms

Ontario consumer protection rules cap deposits at 10% on most home-renovation contracts. The standard GTA deck payment schedule:

• 10% deposit on contract signing. Anything higher is illegal and a red flag.
• 30% on delivery of materials to site.Some contractors phrase this as “on commencement.” Either way, the trigger is that materials are physically on your property.
• 30% on framing complete and passing framing inspection (if permitted).
• 20% on decking and railing complete.
• 10% holdback for 45 days under the Ontario Construction Act, released after the lien period expires and the deck passes final inspection.

That last bullet is the one most homeowners skip. It’s also the most legally protective.

Lien rights under the Ontario Construction Act

The Construction Act (formerly the Construction Lien Act) gives contractors, subcontractors, and material suppliers the right to register a lien against your property if they aren’t paid. That right is automatic and applies even if you’ve already paid your contractor — if your contractor didn’t pay their suppliers, the suppliers can lien your house.

The Act’s protection mechanism is the holdback: 10% of every payment must be retained for 60 days after the project is “substantially complete,” and during that 60-day window, suppliers and subs have the right to register a lien if they have an unpaid claim. After 60 days, the lien window closes and you can release the holdback to the contractor.

Practical implications:

• Withhold 10% of every progress payment, not just the final one. Most contractors will accept this if it’s in the contract.
• Get signed statutory declarations from the contractor confirming suppliers and subs are paid, before releasing the holdback.
• If a lien is registered, you have 14 days to respond. Don’t ignore it. A construction-law paralegal can usually deal with it for $500–$1,500.

Fifteen questions that separate good builders from cheap ones

Walk into the site visit with these. The answers tell you almost everything about whether the quote you’re about to receive is a real bid or a sales pitch.

1. Who applies for the permit, and is the fee in the quote?
2. What joist size and on-centre spacing for this deck?
3. What size and depth of footings?
4. How is the ledger attached to the house, and what flashing detail?
5. What fasteners — face-screwed, hidden, or both?
6. Who removes and disposes of the old deck, and what’s the disposal fee?
7. What’s your WSIB clearance number and insurance broker?
8. Three addresses I can drive past?
9. What’s your change-order process?
10. What’s the workmanship warranty length and what does it cover?
11. Who’s the lead carpenter on this job, and will they be here every day?
12. Are subs used for the railing or framing? Names?
13. What’s your payment schedule, and do you hold the Construction Act holdback?
14. What’s the start date and the working-days estimate, in writing?
15. What happens if you go over schedule by more than two weeks?

We’ve put these in a printable format — see the contractor questions checklist — so you can take it to site visits and fill it in by hand. The contractor’s reaction to being asked these is often more informative than the answers themselves.

The three quotes rule, applied

Three quotes is the working minimum. Two is a coin flip. One is a leap of faith. But three quotes only help if you can actually compare them — and three contractors will rarely write their quotes in the same shape.

The fix is to normalize them yourself: take each quote, pull out the line-item subtotals (demolition, footings, framing, decking, railing, stairs, permits, cleanup), and lay them out side by side. The quote comparison worksheet does this in a printable form. Once normalized, the answer usually isn’t the cheapest quote — it’s the most honest quote.

Once the build starts, the next phase is keeping it alive — which is what Chapter V covers.