How to Choose a Bathroom Renovation Contractor

Table of Contents

• Define Your Renovation Scope and Project Goals
• Set a Realistic Budget and Understand Cost Factors
• Questions to Ask a Bathroom Contractor
• How to Compare Renovation Quotes Line by Line
  • Build a reusable quote-comparison worksheet
  • Separate fixed-price items from allowances
  • Track exclusions explicitly
  • Normalize before you rank
  • Read the payment schedule as part of the quote
  • What a good quote looks like
• Verify Licences, Insurance, and WSIB Coverage
  • Licensing: what actually applies to a bathroom renovation
  • Insurance: read the certificate, do not just collect it
  • WSIB: the clearance certificate is the proof
  • Consumer protections and dispute options in Ontario
  • A verification checklist you can run in one afternoon
• Check Bathroom Contractor References and Reviews
• Bathroom Renovation Contract Checklist
• Red Flags and What to Avoid
• Frequently Asked Questions

Last Updated: October 12, 2026

Define Your Renovation Scope and Project Goals

The first step in choosing a bathroom renovation contractor is getting clear on what you want to accomplish.

Start by asking yourself these questions:

• Are you replacing fixtures only, or gutting the entire bathroom?
• Do you need plumbing or electrical work moved?
• Are you changing the layout, or keeping the existing footprint?

Write down your answers, this becomes your scope document, which a good bathroom renovation contractor uses to build an accurate estimate.

At Restmark Renovations, we start every project by clarifying scope with detailed questions about what needs to change and why.

Set a Realistic Budget and Understand Cost Factors

Many homeowners underestimate bathroom renovation costs because they don't understand what drives the price.

• Demolition and disposal, removing old fixtures, flooring, and tile
• Plumbing work, moving pipes, upgrading fixtures, adding ventilation
• Waterproofing, critical in bathrooms to prevent water damage and mold

Older homes hide surprises, water damage behind walls, outdated plumbing, or structural issues can appear once demolition begins, which is why experienced contractors build in contingency. Set a realistic budget range based on your scope.

Questions to Ask a Bathroom Contractor

Ask every contractor the same questions to compare responses fairly.

About their experience:

• How many bathroom renovations have you completed in the past three years?
• Can you show me a portfolio of similar projects?
• How long have you been in business?

About the project:

• How long will this renovation take from start to finish?
• Will you be on-site daily, or checking in periodically?
• How do you handle changes or unexpected issues discovered during work?

About communication and management:

• How will you keep me updated on progress?
• What's your preferred method of communication (phone, email, text)?
• Who do I contact if there's a problem during the project?

About warranty and guarantees:

• What warranty do you offer on your workmanship?
• How long does the warranty last?
• What's covered, labour, materials, or both?

These questions reveal whether a contractor is organized, experienced, and communicative. Pay attention to how they answer, not just what they say.

How to Compare Renovation Quotes Line by Line

Bathroom renovation budgets blow up when homeowners compare headline totals instead of line items. Two quotes can differ by thousands and still cover completely different scopes. The fix is a like-for-like comparison worksheet you build once and reuse for every bid.

Build a reusable quote-comparison worksheet

Create a spreadsheet with one column per contractor and one row per line item, using the same rows for every bid so nothing hides:

Separate fixed-price items from allowances

An allowance is a placeholder figure for something not yet selected, tile, fixtures, vanity. A fixed price is locked for defined work. Mixing the two is how a "cheaper" quote becomes the most expensive one.

For every allowance, ask:

• What dollar amount is assumed?
• What happens if the selected product costs more, who absorbs the difference?
• Is there a markup applied on top of the allowance?

A $1,500 tile allowance with 20% markup behaves very differently from a $3,000 allowance with no markup.

Track exclusions explicitly

Every quote should have a written exclusions list. Common exclusions:

• Subfloor repair or replacement
• Mold remediation
• Moving or upgrading the exhaust fan ducting

If an exclusion appears on one bid and not another, add it as a row and price it out before comparing totals.

Normalize before you rank

Once every bid is mapped to the same rows, adjust for differences:

1. Add the cost of any excluded item to the bid that omits it.
2. Replace allowance figures with your actual product selections where possible.
3. Confirm whether HST and the permit fee are included.
4. Confirm the contingency percentage each contractor is carrying.

Only then compare totals. A bid that looked $4,000 cheaper often becomes the most expensive once exclusions and allowances are normalized.

Read the payment schedule as part of the quote

The payment schedule is a quote line item, not a separate conversation. A reasonable structure ties payments to milestones, a deposit at signing, a draw after rough-in and inspection, a draw after tile and waterproofing, and a final holdback released after a walkthrough and deficiency list. Be cautious of schedules that front-load most of the money before substantial work is complete.

What a good quote looks like

A strong bathroom quote is specific enough that two strangers could read it and agree on what was sold. It names products, quantities, and methods, states exclusions, shows the payment schedule, and states who pulls permits. If it can't answer those four things in writing, it isn't ready to compare.

Verify Licences, Insurance, and WSIB Coverage

This is the step homeowners skip most often, and it determines whether you have recourse when something goes wrong. In Ontario, verification is three separate confirmations, each with its own source of truth.

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Licensing: what actually applies to a bathroom renovation

Ontario does not issue a single "renovation contractor licence." Instead, licensing depends on the trades involved:

• Electrical work must be done by a Licensed Electrical Contractor registered with the Electrical Safety Authority (ESA). You can verify a contractor's ECRA/ESA licence number directly on the ESA website.
• Plumbing work is regulated under the Building Code Act and performed by a licensed plumber. Ask for the plumber's licence number and confirm it with the Ontario College of Trades or the applicable provincial authority.
• General contracting itself is not provincially licensed in Ontario, which is exactly why the insurance and WSIB checks below matter more, not less.

If a contractor claims to be "fully licensed" without specifying which licence, ask them to name the regulator and licence number. A legitimate contractor will have both ready.

Insurance: read the certificate, do not just collect it

Ask for a Certificate of Insurance and check four things on the document itself:

1. General liability, confirm the coverage limit suits a renovation of your size.
2. Named insured, the business name should match the name on your contract.
3. Policy dates, coverage must span your entire project, including the warranty period if workmanship coverage is bundled.
4. Certificate holder, ask to be added as a certificate holder or confirm the insurer will notify you of cancellation.

A certificate that expired last month, or lists a different company name, is not proof of coverage.

WSIB: the clearance certificate is the proof

The Workplace Safety and Insurance Board (WSIB) covers workers injured on the job. If a contractor lacks an active WSIB account, an injured worker can pursue the homeowner, a real financial exposure, not a technicality.

The document that matters is a WSIB Clearance Certificate, issued for a specific period, confirming the contractor's account is in good standing.

Consumer protections and dispute options in Ontario

Ontario has specific protections that apply to home renovations:

• Consumer Protection Act, 2002, covers unfair practices, false representations, and certain contract requirements.
• Cooling-off period, for contracts signed in your home, there is a cooling-off period during which you can cancel. Confirm the current period and conditions before relying on it.
• Written contract requirements, certain contracts must be in writing and include specific information. A verbal agreement leaves you with far less recourse.

If a dispute arises, document everything in writing: dated photos, emails, change orders, and payment records. Ontario's consumer protection framework favors the party with the better paper trail.

A verification checklist you can run in one afternoon

1. Ask for the ECRA/ESA licence number for electrical work and verify it.
2. Ask for the plumber's licence number and verify it.
3. Request a current Certificate of Insurance and read the four items above.
4. Request a current WSIB Clearance Certificate and confirm the dates.
5. Confirm the business name on every document matches the contract.
6. Save copies of all documents alongside your signed contract.

Never hire a contractor who refuses to provide this documentation. It is a major red flag.

Check Bathroom Contractor References and Reviews

References and reviews tell you how a contractor actually performs on real projects. Request at least three references from recent bathroom renovation projects. When you call, ask:

• Was the project completed on time?
• Did the contractor stay within budget?
• How was the communication throughout the project?

Listen for hesitation or vague answers, references should speak confidently about their contractor. Check online reviews on Google, Homestars, and local business directories. One negative review might be an outlier; multiple complaints about the same issue (missed deadlines, poor communication, incomplete work) suggest a real problem. Be skeptical of contractors with no online presence, established professionals have a verifiable track record.

Bathroom Renovation Contract Checklist

A written contract protects both you and the contractor. Never start work without one. It should include:

• Scope of work, detailed description of what will be done
• Materials list, specific brands, colours, and quantities
• Cleanup and site management, how the contractor will maintain your home

Review the contract carefully before signing and ask about anything unclear. A reputable contractor welcomes questions.

Red Flags and What to Avoid

Watch for these warning signs.

Payment red flags:

• Asking for payment in full upfront
• Requesting cash payments only
• Unwilling to provide a written contract

Communication red flags:

• Difficult to reach or slow to respond
• Evasive about timelines or costs
• Unwilling to provide references

Credential red flags:

• No proof of licensing or insurance
• Unwilling to provide WSIB documentation
• No portfolio or references available

Scope red flags:

• Pushing to start work before finalizing the scope
• Vague about what's included in the quote
• Reluctant to provide a detailed written estimate

Trust your gut. If something feels off, keep looking, plenty of qualified contractors will earn your trust through transparency.

Choosing the right bathroom renovation contractor requires time and careful evaluation. Define your scope, set a realistic budget, ask tough questions, and verify credentials. A contractor who communicates clearly, provides detailed written quotes, and maintains proper insurance and licensing will deliver the stress-free experience you deserve.