How to Hire a Tile Installer in Ontario: Questions to Ask

Ask these 16 questions before you choose an installer

Use the same core questions in every interview and ask for important answers in writing.

An installer may need to inspect the site or review product data before answering. Save the answers with the estimate and project correspondence.

Make every written estimate cover the same scope

Start with a one-page project brief: room, approximate dimensions, existing finish, demolition status, tile material and size, pattern, edge detail, desired start window, access limits, and work expected from other trades. The checklist in what to send before a tile installation project can help you assemble it.

Treat a remote number as preliminary when the surface is concealed or uninspected. Ask how final scope will be confirmed and which conditions require a written change.

Request project-specific proof, not a generic portfolio

A portfolio shows taste; comparable evidence shows judgment. Ask for work using a similar tile size and material on a similar substrate and in the same risk category. A dry backsplash does not prove shower-waterproofing ability, and a small mosaic does not prove large-format floor preparation. Confirm that the installer or crew being quoted actually completed the work shown.

For technical projects, request progress photos that reveal preparation, seams, corners, drains, coverage checks, movement accommodation, or other details later hidden by tile. Ask references what was originally quoted, how changes were documented, whether the schedule and cleanup matched expectations, and how the contractor handled a concern after completion. Ontario also recommends references from similar work, including recent and older projects because some problems take time to appear.

Ask how the substrate will be assessed and prepared

Tile follows the surface beneath it. Before installation, the installer should identify what the tile will bond to and assess whether it is sound, suitably flat or plumb, clean, stable, and compatible with the selected system. Floors may also require attention to cracks, deflection, transitions, floor height, moisture, old adhesive, or multiple existing layers. Walls may need correction before a precise layout can be achieved.

Ask who is responsible for demolition, substrate repair, flattening or levelling, backer board or membrane, and approval before tile starts. The quote should explain how concealed damage will be documented and priced if discovered. For a deeper planning overview, see waterproofing and tile preparation. A proposal that says only “install tile” leaves the most consequential work undefined.

For showers, name the waterproofing system and test plan

Tile and grout are finishes, not a complete water-management system. Ask the installer to name the intended shower method and compatible products for the substrate, membrane, seams, corners, drain connection, curb, niche, bench, and pipe penetrations. The Tile Council of North America notes that membrane and backer-board compatibility depends on manufacturer recommendations, while local requirements still have to be checked.

Ask whether the assembly will receive a pre-tile water or flood test where applicable, how the drain will be plugged, when and how long it will be tested, and how the result will be recorded. Timing is product-specific, so the installer should follow the exact manufacturer's cure and test instructions. A flood test checks the contained base and drain connection; it does not replace inspection of wall seams and penetrations.

Request photos before tile hides the system and keep the product names with your contract records. Why shower waterproofing matters before tile explains the assembly in more detail.

Confirm movement joints and changes of plane

Tile, substrate, framing, and adjoining materials do not move identically. The Tile Council of North America recommends movement accommodation in every tile installation, but the placement and frequency depend on site conditions. A small room may rely largely on a concealed perimeter gap; larger, sunny, or moisture-exposed areas can require a more developed plan. Existing structural or movement joints also need deliberate treatment.

Ask where perimeter and field movement joints will go and what will happen where a wall meets a floor, two walls meet, tile meets another material, or the backing changes. Changes of plane generally need an appropriate flexible sealant or soft-joint detail rather than hard grout bridging independently moving surfaces. The answer should reflect the room, tile, exposure, and assembly, not “we grout everything.”

Ask how mortar contact and tile bond will be checked

Good bond is a process, not a promise. Ask how the installer chooses a mortar and trowel for the tile, substrate, environment, and manufacturer requirements; keys mortar into the surface; collapses the ridges; and periodically lifts tile to check contact. Large or deeply patterned tile backs may need additional steps to achieve the required support. Spot-setting tile in isolated dabs is not a substitute for proper coverage.

The Tile Council of North America lists poor coverage, contamination, movement, deflection, expired working time, and disturbing mortar during cure among possible causes of bond loss. It also cautions that a hollow sound alone does not prove imminent failure; some well-bonded assemblies can sound different. Ask about installation controls and on-site inspection instead of demanding an absolute “no hollow sound” guarantee.

Understand what 241A and Red Seal status mean in Ontario

Ontario's Terrazzo, Tile and Marble Setter trade is code 241A. Skilled Trades Ontario identifies it as a Red Seal trade with an apprenticeship program and certifying exam, but it is non-compulsory. That means a Certificate of Qualification is not legally required simply to practise tile setting in Ontario, and people in the trade do not appear on the public register on that basis.

Ask about 241A certification, Red Seal endorsement, apprenticeship, manufacturer training, and relevant experience, then evaluate the answers alongside comparable work and the proposed method. Certification can be meaningful evidence of structured training; its absence is not proof of unlawful practice, and its presence does not replace project-specific due diligence. Plumbing and electrical work are separate scopes that may require appropriately authorized trades and permits.

Verify liability insurance and handle WSIB carefully

Commercial general liability insurance and WSIB are different protections. Ask for a current certificate of insurance identifying the contracting business. Confirm who will be on site, whether employees or subcontractors are involved, and who is responsible for damage and site protection.

WSIB clearance rules generally apply in construction, but there is a home-renovation exception. A self-employed contractor may be exempt when directly retained and paid by the homeowner or family member occupying the existing private residence, provided the business works exclusively in qualifying home renovation. Employees and subcontractors can change the analysis; employee earnings still must be reported, and contractor-retained subcontractors may require clearances.

Do not assume “no clearance” always means non-compliance, and do not accept “home renovation is always exempt” as a complete answer. Ask the installer to explain which facts apply to your contract and verify uncertain cases with WSIB before work begins.

Put payment, changes, schedule, and warranty in the contract

Ontario says a home-renovation contract worth more than $50 must be in writing. It should identify the contractor, describe the work and materials, state the total cost and payment terms, give start and completion dates, allocate cleanup and subtrade responsibilities, and clearly describe warranties. Include the written estimate in the contract: under Ontario consumer law, the final price then generally cannot exceed it by more than 10% unless you agree to new work or a new price and sign a contract change.

Tie payments to clear milestones, keep receipts, and avoid paying in full before contracted work is complete. Every change order should describe the work, price, schedule effect, and approval before it proceeds. The contract should address delays, homeowner-supplied tile, hidden conditions, cure periods, access, and disputes.

Do not accept “standard warranty” without its terms. Ask for the duration, covered defects, exclusions, maintenance duties, notice and response process, and whether removal and reinstallation labour is included. Distinguish installer coverage from manufacturer warranties. If a contract worth $50 or more is signed in your home, Ontario provides a 10-calendar-day cooling-off period; requested work and materials supplied during that period may still require reasonable compensation after cancellation.

Use red flags and a 12-point scorecard to decide

Red flags include pressure to sign; a phone-only estimate without clear assumptions; a one-line scope; cash without receipts; a large unexplained deposit; full payment before completion; unverifiable photos; no comparable references; vague substrate or waterproofing answers; hard grout at every change of plane; no written change process; or no warranty terms. Be cautious if someone calls 241A a mandatory Ontario tile licence or gives a blanket WSIB answer without examining the contract and workforce.

Score each category from 0 to 2 for a maximum of 12, using verifiable evidence. The tool is not a guarantee: do not average away a serious waterproofing, safety, insurance, or contract gap. When ready, review custom tile installation services or send your project details.