Most homeowners in the GTA spend more time comparing paver colours than they do vetting the contractor installing them. That is understandable. But the contractor decision is the one that determines whether your driveway looks the same in five years as it does on day one.
Getting it wrong is not just frustrating. It is expensive. Redoing a failed interlocking job often costs more than the original project. And in a region where contractor fraud is documented, not hypothetical, the stakes are real.
Still early in the process? Start with our Complete Guide to Interlocking in the GTA (2026) first, then come back here before you sign anything.
Key Takeaways
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A bad interlocking contractor costs more to fix than the original project. Sometimes far more. - ✓
Ten specific checks before signing separate contractors worth hiring from those worth avoiding. - ✓
In Ontario, ask for proof of liability insurance and WSIB coverage before any work begins. - ✓
A reasonable deposit is 10 to 25% of the project total. Anything over 50% upfront is a red flag. - ✓
The warranty that matters is workmanship, not materials. Ask what it covers in plain terms. - ✓
Who is on site managing the crew every day matters as much as anything else you check.
Why Choosing the Wrong Contractor Costs More Than the Project Itself
This is not meant to scare you. It is just honest.
CBC News reported in April 2024 on a Vaughan-based contractor who was sued 11 times. GTA families collectively paid over $200,000 for unfinished interlocking and pool work. One family paid more than $72,000. What they received was gravel, wrong-coloured stone, unfinished steps, and four posts in the ground where a canopy was supposed to be. The job was supposed to take two weeks. It dragged on for nearly a year, with the contractor repeatedly promising via text that workers would show up.
That case is not unique. Peel Regional Police arrested a contractor in 2022 for fraud across multiple GTA cities, with losses estimated at over $1 million. The pattern is always similar: collect a deposit, start the work or skip it entirely, stop showing up.
Most of these situations could have been avoided. Not with luck. With basic verification steps that take less than an hour. Here is what to check.
The 10 Things to Check Before You Sign
Work through each of these before you commit to anyone. Some take five minutes. A few take a phone call. All of them matter.
They Visit the Property Before Quoting
This is the first filter. And it removes a large portion of the market immediately.
A contractor who quotes from photos or a phone call is guessing. They cannot see your drainage patterns. They cannot assess your soil. They do not know whether a machine can reach your backyard or whether your side yard requires hand-carrying material through a fence gate. They have not seen the grade. They do not know what is under your existing surface.
All of those things affect the price. All of them affect how the job should be built. A remote quote is a number that protects the contractor from accountability, not a number that reflects your specific property.
Alex Wang, founder of Inno Interlocking, visits every property personally before any quote is prepared. Not a salesperson. Not an estimator working from satellite imagery. Him. Because the decisions made at the assessment stage determine the quality of everything that follows. If a contractor cannot commit to visiting your property before sending a number, move on.
They Carry Liability Insurance and WSIB Coverage
Two separate things. Both matter.
General Liability Insurance
Protects you if something goes wrong on your property during the job. A crew member gets injured. A machine damages your neighbour’s fence. Without liability insurance, those costs come out of your pocket. The standard minimum in the GTA is $2 million. Ask for a Certificate of Insurance with your property address on it.
WSIB Coverage
Ontario’s workers compensation program. Residential interlocking falls under Class C (Rate Group 190). Commercial interlocking falls under Class G (Construction), where WSIB clearance is mandatory. For residential work, any properly registered contractor should have it. Ask for a clearance number and verify it at wsib.ca.
Ask for both documents. A real contractor has them and hands them over without hesitation. If the response is “I’ll get that to you later” — that is a red flag.
The Quote Is Written, Detailed, and Itemised
A quote that reads “driveway installation: $18,000” is not a quote. It is a number on paper.
A proper written quote for an interlocking project should specify every item that has a cost or a decision attached to it:
Base material and thickness
Compaction passes
Paver type, colour and thickness
Pattern
Edge restraint type
Polymeric sand
Demolition scope
Bin and disposal included
Project timeline
Warranty terms
Vague quotes protect the contractor. Detailed quotes protect you. If you receive a quote that does not specify the above, ask for it in writing before signing. A contractor who resists putting specifics in writing is telling you exactly what level of accountability to expect during the job.
You Understand Exactly What the Base Preparation Includes
Base preparation is where roughly 60 to 70% of what determines whether a project succeeds or fails is decided. It is also the part that is completely invisible once the pavers are laid. Which makes it the easiest place to cut corners and the hardest place to verify after the fact.
Do not ask “do you do proper base prep.” Everyone says yes to that. Ask specifically:
- How many inches of aggregate base will you be installing?
- What is your excavation depth for this project type?
- How many compaction passes do you do between layers?
- Do you use geotextile fabric to separate the native soil from the aggregate?
A contractor with a consistent, professional process can answer all four without thinking about it. A contractor who hedges, generalises, or says “whatever the job needs” — that answer tells you the process is not consistent.
Inadequate base preparation is the single most common reason interlocking fails early in the GTA. For more context on why this matters in Ontario’s climate, read our Complete Guide to Interlocking in the GTA (2026).
The Deposit Is Reasonable
Deposits are normal. A contractor needs to hold your spot in their schedule, order materials, and sometimes pull permits before physical work begins. All of that requires commitment from both sides.
Normal Range
10 to 25% of total project value
Worth Discussing
25 to 50% on large material orders
Red Flag
50%+ before any work begins
Cash only is a risk. It leaves no paper trail and no recourse if work does not happen. Always pay by cheque, bank transfer, or credit card. Always get a written receipt.
Pressure to pay more upfront than agreed during the project before corresponding milestones are complete is a serious warning sign. This is a common pattern in cases that end in fraud complaints.
The Payment Schedule Is Tied to Milestones, Not Arbitrary Dates
Money should follow work. That is the basic principle of a fair payment schedule. For a typical interlocking project in the GTA, a reasonable structure looks like this:
Deposit
10 to 25% at signing reserves your schedule slot and initiates material orders
2nd Payment
20 to 30% when materials are delivered to site
3rd Payment
30 to 40% when installation is complete
Holdback
10% held for 45 days after completion your legal right under Ontario’s Construction Act
Under Ontario’s Construction Act, homeowners are entitled to hold back 10% of each payment for 45 days after project completion. This protects you against liens from subcontractors or suppliers who were not paid by the contractor. Most homeowners do not know this right exists.
You Can See Recent Work in Your Area
Photos on a website are marketing, not verification. Any contractor can post the best job from ten years ago. What you want to see is recent work from the past one to two seasons, in your municipality or a nearby neighbourhood, on a project similar in scope to yours.
Ask to see a specific address or to speak with a recent client. A contractor who works regularly across the GTA will have no hesitation with this request.
When you visit or review photos of recent local work, look for:
- Tight, consistent joints throughout the surface
- Straight, well-fitted edges and borders
- No visible pooling in photos taken after rain
- Clean, precise cuts at curves and steps
- A finish that matches what you were quoted, not a downgrade
The Warranty Covers Workmanship, Not Just Materials
This is one of the most misunderstood parts of any interlocking contract.
Material Warranty
Comes from the paver manufacturer. Covers defects in the product itself. Applies whether the contractor installed them well or badly. This is NOT a contractor warranty.
Workmanship Warranty
Comes from the contractor. Covers how the job was done settling, drainage failures, edge restraint issues, structural problems from installation decisions. This is what actually protects you.
Ask plainly: if I have settling or a drainage problem in the first year, what do you do? A contractor with a real workmanship warranty will tell you: we come back, we assess, we fix what is ours to fix.
Inno Interlocking backs every installation with a 2-year workmanship warranty covering base depth decisions, compaction, drainage design, and edge restraint placement. If something is not right in year one, you call. We come back. We fix what is ours to fix.
The Contract Has a Clear Start Date, Timeline, and Full Scope of Work
Verbal commitments are not enforceable. That applies to start dates, timelines, material specifications, and scope. Anything agreed upon verbally that is not in the written contract does not exist legally or practically.
One of the most common patterns in contractor problems is that the quote and the contract do not match. The quote specifies 10 inches of base; the contract says “industry standard base.” The quote says a specific paver model; the contract says “paver to be confirmed.” Those gaps create room for substitution and shortcuts that are difficult to challenge after the fact.
Read the contract against the quote, line by line, before signing. A proper contract should include:
- A specific start date or a clear window with stated conditions
- A realistic project completion timeline
- The full scope of work with all material specifications from the quote carried forward
- What happens if materials are delayed or unavailable
- How scope changes are handled and priced
- A named contact person responsible for the project
Who Is Actually on Site Managing the Work
This is the question most homeowners forget to ask. And it is one of the most revealing.
There is a significant difference between a contractor who personally oversees the project and one who signs the contract, collects the deposit, and hands your job to a subcontracted crew they may not have worked with before. That second arrangement is more common than homeowners realise.
The person who assessed your property, understood your drainage conditions, and knew why your base needed a certain depth that knowledge needs to be present on site during installation. If the crew doing the work received no site briefing, the assessment becomes irrelevant.
Ask directly: who will be on site each day? Is the owner or a named supervisor present during excavation, base compaction, and paver installation?
At Inno Interlocking, Alex Wang reviews layouts, discusses material choices on site, and stays involved while work is underway. For a project that costs $15,000 or more and is supposed to last 25 years, the person you spoke with should be involved in delivery. That level of personal involvement is not standard across the GTA. It should be.
Red Flags to Walk Away From
Some things do not need detailed explanation. They just need to be on your radar. If you encounter several of these from the same contractor, do not proceed.
Demands full payment upfront before any work begins
Cannot or will not provide proof of liability insurance or a WSIB clearance number
Quote is verbal, vague, or does not specify base preparation details
Pressures you to sign quickly “this price is only good until Friday,” “I have a crew available this week only”
No physical business address and no traceable company registration
Only accepts cash with no paper trail
Cannot point to a specific recent job in your area when asked
Quote is dramatically lower than every other estimate received by $4,000 or more on a comparable scope
Becomes defensive or evasive when asked basic technical questions about the installation process
Asks for additional large payments before corresponding work milestones are complete
What a Good Contract Should Include
Not legal advice. Just practical clarity on what should be in writing before you sign anything.
Scope and Materials
- Full scope of work with specific materials and depths
- Paver specifications matching the quote exactly
- Demolition scope and whether bin disposal is included
- How substitutions are handled if a material is unavailable
Timeline and Payment
- Specific start date or a stated window with conditions
- Realistic project completion timeline
- Milestone-based payment schedule
- A 10% holdback for 45 days post-completion
Warranty and Accountability
- Workmanship warranty terms in plain language
- What is covered, for how long, and the process for claims
- A named project contact person
- Both parties’ signatures and the date
Ontario Consumer Protection Act: If you signed a contract in your home in Ontario, you have a 10-day cooling-off period during which you can cancel for any reason and receive your deposit back within 15 days. That protection exists. Know it before you sign.
GTA Contractor Fraud Context and Legal Background (2026)
These are not hypothetical warnings. They are documented cases and legal frameworks that apply to any homeowner hiring an interlocking contractor in the GTA right now.
Documented GTA Interlocking Contractor Fraud
CBC News reported in April 2024 on a Vaughan-based contractor sued 11 times. GTA families collectively paid over $200,000 for unfinished interlocking and pool work. One family paid more than $72,000 and received gravel, wrong-coloured stone, and unfinished work nearly a year after the job was supposed to be complete. A default judgment of $9,000 was issued against the contractor in one case after payments for undelivered work went unrecovered.
Peel Regional Police Contractor Fraud Arrest
In August 2022, a man was arrested for contractor fraud across multiple GTA cities over a two-year period. Estimated losses exceeded $1 million. The fraud involved promising contractor services, collecting deposits, and either never starting or abandoning work. Several victims said services never even began after deposits were paid.
WSIB Requirements for Ontario Interlocking Contractors
Under the WSIB Employer Classification Manual, residential interlocking installation falls under Class C (Rate Group 190). Commercial interlocking falls under Class G (Construction), where WSIB clearance is mandatory before work begins. Any properly registered interlocking business in Ontario should have WSIB coverage. Request a clearance number and verify it at wsib.ca before any work begins.
GTA Liability Insurance Standard
Most GTA contracts and municipalities require at least $2 million in general liability coverage for contractors. A Certificate of Insurance naming your property should be obtainable from any insured contractor on request. This is not an aggressive ask it is standard practice for any professional operation.
Ontario Construction Act The 10% Holdback Right
Under Ontario’s Construction Act, homeowners have the right to hold back 10% of each payment for 45 days after substantial project completion. This holdback acts as a financial buffer against liens placed by subcontractors or material suppliers who were not paid by the contractor. Most homeowners are unaware this right exists. It is worth knowing and worth including in your payment schedule.
Spring 2026 Pressure Tactics Are More Common in Peak Season
High demand from April through July creates conditions where some contractors use urgency to push homeowners to sign before they have done proper verification. Any contractor who cannot hold a quote open for 48 to 72 hours while you verify insurance, check references, and read the contract carefully is not a contractor worth hiring. The pressure itself is information.
Ready to Talk to a Contractor Who Passes All 10?
Site visit before the quote. Detailed written proposal. Milestone-based payment. Two-year workmanship warranty. Alex Wang on site personally through every project.
If you want to see how Inno Interlocking works before you decide, we are happy to come take a look at your property. No pressure. Just an honest conversation. View all service areas across the GTA.
Frequently Asked Questions
1. How do I verify that an interlocking contractor is legitimate in Ontario?
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Ask for a written quote with full scope detail, a Certificate of Insurance showing at least $2 million in general liability coverage, and a WSIB clearance number. Verify the WSIB number at wsib.ca. Check for a physical business address, a traceable company registration, and recent verifiable local references. Any contractor who cannot provide all of these should not be hired.
2. How much deposit is normal for an interlocking project in the GTA?
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A reasonable deposit is typically 10 to 25% of the total project cost. For a smaller project under $10,000, a higher percentage may be reasonable. For a project over $20,000, a deposit over 30% before any work begins warrants a direct conversation. Anything over 50% upfront with no written contract is a red flag. Always pay by cheque, bank transfer, or credit card never cash and always get a written receipt.
3. What is the difference between a material warranty and a workmanship warranty?
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A material warranty comes from the paver manufacturer and covers defects in the product itself cracking, fading, structural issues in the paver unit. A workmanship warranty comes from the contractor and covers how the job was done settling from poor base preparation, drainage problems from incorrect grading, edge restraint failures. The workmanship warranty is what actually protects you from a contractor’s mistakes. Always ask for it in writing with specific terms.
4. Can I legally hold back money from my contractor at the end of the job?
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Yes. Under Ontario’s Construction Act, homeowners have the right to hold back 10% of each payment for 45 days after substantial project completion. This holdback protects you against liens placed by subcontractors or material suppliers who were not paid by the contractor. This is a legal right you do not need to negotiate it separately, though including it in the payment schedule documentation is advisable.
5. What should I do if a contractor disappears mid-project?
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Document everything first photos of the unfinished work, all contracts and communications, all payment receipts. File a complaint with your local police and Consumer Protection Ontario at ontario.ca. If you have a signed contract, you may have options through small claims court for amounts under $35,000. For amounts above that, consult a lawyer. Do not make additional payments, and do not allow the contractor back on site without a written commitment to complete work by a specific date.
6. Is it normal for a contractor to only accept cash?
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No. Cash leaves no paper trail and gives you no recourse if work is not done or is done badly. Reputable contractors accept cheque, bank transfer, or credit card. Paying by credit card gives you an additional layer of chargeback protection. Always get a written receipt for any payment made, regardless of method.
7. Do interlocking contractors in Ontario need to be licensed?
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There is no single province-wide licence required specifically for interlocking work in Ontario. However, a legitimate business should be registered with the province, carry liability insurance, and be registered with the WSIB where required. The absence of a formal licence requirement is exactly why verifying insurance, WSIB coverage, and references matters there is no government-issued filter that screens out unqualified operators automatically.
8. How many quotes should I get for an interlocking project?
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Get at least three not to simply pick the lowest, but to understand the range and identify what is driving any significant differences. Ask each contractor to specify base preparation details in their quote so you can compare them on equal footing. A quote that is dramatically lower than two others almost always reflects shallower base preparation, fewer compaction passes, or excluded demolition and disposal costs. For more on reading quotes, see our Complete Interlocking Guide and our pricing guide.
9. What happens if the contractor uses different materials than what was quoted?
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If the contract specifies the materials and the contractor substitutes without your written approval, that is a breach of contract. This is why material specifications need to be in the contract itself, not just in the quote. If you notice substitutions during the job, stop payment and raise it in writing immediately. Do not wait until the job is complete changes are much harder to address retroactively.
10. How do I know if a contractor is actually doing the base preparation they promised?
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Ask to be present during excavation and base compaction. Take photos. Ask the contractor or site supervisor to confirm the depth of excavation before the base material goes in. A contractor with nothing to hide will welcome this. Some homeowners hire an independent inspector for larger projects. If a contractor objects to you being present during installation, that objection itself is information worth having.
Disclaimer: The information provided in this guide is based on our professional experience, publicly available legal resources, Ontario government guidelines, and industry research as of 2026. It is not legal advice. Ontario’s Construction Act, Consumer Protection Act, and WSIB requirements are subject to change. Always verify current requirements with the relevant authority before entering into a contract. If you have experienced contractor fraud, contact your local police and Consumer Protection Ontario at ontario.ca. If you have questions specific to your project or situation, contact us directly and we will point you in the right direction.