How Do You Choose a Siding Contractor in Ontario?

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Quick Answer

Before signing, verify five things: a valid WSIB clearance certificate, at least $2M liability insurance, an HST registration number, a written workmanship warranty of 5 years or more, and manufacturer certification for the product being installed.

Get three itemized written quotes. Never pay more than a 10–15% deposit up front, and never pay cash for a "no-HST" discount, it voids your recourse entirely.

The verification checklist

WSIB clearance certificate. Ask for it in writing and verify it on the WSIB site. Without it, if a worker is injured on your property, you can be held liable.
Commercial general liability. $2M minimum; $5M is the standard for reputable exterior contractors. Ask for the certificate, not a verbal claim.
HST number on the quote. A legitimate business over $30K in revenue must be registered. No HST number is a red flag about everything else.
Written workmanship warranty. Material warranties come from the manufacturer. The labour warranty comes from the contractor. 5 years is a floor, 10 years is the mark of a company that expects to still exist.
Manufacturer certification. James Hardie Preferred Contractor, CertainTeed 5-Star, and similar programs require training and inspection, and they are what keeps the material warranty valid.
In-house crew vs subcontractors. Ask directly. Subcontracted crews change between the quote and the install, and warranty claims get bounced between parties.
Recent local references. Ask for three addresses in your region from the last 12 months, and drive by them.

What a proper quote contains

An itemized siding quote should name all of these. If any are missing, ask:

Exact product, manufacturer, line, profile and colour
Tear-off and disposal of existing siding. Stated explicitly
House wrap type and flashing details
Trim, corners, soffit and fascia scope
A written contingency rate for sheathing repair (per sheet or per sq ft)
Payment schedule and deposit amount
Start window and expected duration
Workmanship warranty length in years

Red flags to walk away from

Door-to-door pressure with a "today only" price.
Deposit over 15%, or a demand for payment in full before work starts.
Cash-only, no HST, no written contract.
A price per square with no material line item.
Refusal to provide WSIB or insurance certificates.
No physical business address in Ontario.
A quote dramatically below the other two. It usually means tear-off, flashing or trim was left out.

Frequently asked questions

Do siding contractors need a licence in Ontario?

There is no province-wide siding-specific trade licence, but contractors must be registered businesses, carry WSIB coverage for their workers, and pull municipal building permits where the work requires one. Verify WSIB and liability insurance in writing before signing.

How much deposit should I pay a siding contractor?

10–15% is standard, enough to cover material ordering. Anything above 30% up front, or full payment before work starts, is a serious red flag in Ontario.

How many quotes should I get for siding?

Three. Compare them line by line rather than on the bottom number. The cheapest quote usually excludes tear-off, flashing or trim, which reappears later as a change order.

What warranty should a siding installer offer?

A minimum 5-year written workmanship warranty on labour, separate from the manufacturer's material warranty. We provide 10 years on workmanship plus the full manufacturer coverage. 30-year non-prorated on James Hardie ColorPlus and lifetime limited on vinyl.

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