When to Involve a Structural Engineer
Before you begin looking for contractors, determine whether a structural engineer needs to be involved. This step cannot be skipped. An engineer provides an independent assessment of your foundation's condition and, if needed, designs the repair solution. The engineer works for you, not the contractor.
An engineer should assess your foundation if you observe any of the following:
- Horizontal cracks in poured concrete or block walls — these indicate lateral pressure and potential structural failure
- Bowing or bulging walls visible to the naked eye
- Vertical cracks wider than 6 mm (approximately 1/4 inch)
- Stair-step cracks in concrete block foundations
- Cracks that grow measurably over time (more than 1 mm per season)
- Cracks with visible displacement (one side higher than the other)
- Gaps between walls and floors or between the foundation and the house structure above
- Doors or windows that no longer close properly
- Any foundation that has been previously repaired and is showing new problems
An engineer's report typically costs $500–$1,500 for a visual inspection and written assessment. If the engineer provides a full structural design with stamped drawings, fees range from $1,000–$4,000. This investment can save you thousands by ensuring you only pay for the repair you actually need — not the repair a contractor assumes you need.
Step 1: Determine If an Engineer Is Required
Evaluate your foundation cracks and decide whether to engage an engineer before any contractor. Use the checklist above. If you are unsure, it is safer to hire an engineer first. A good contractor will welcome the involvement of an independent engineer because it clarifies the scope of work and reduces liability for everyone.
Step 2: Verify WSIB and Insurance
This is a non-negotiable step. Every contractor performing construction work in Ontario must carry WSIB (Workplace Safety and Insurance Board) coverage. Ask each candidate for their WSIB clearance letter, which confirms their account is in good standing. Verify the letter by using the WSIB online clearance checker at wsib.ca.
Also request a certificate of insurance showing at least $1–2 million in general liability insurance. The certificate should name you or your property as an additional insured. This protects you if the contractor damages your property during the work.
Step 3: Get Three Written Quotes
Never hire a foundation repair contractor based on a single quote. Obtain at least three written quotes from different contractors. Do not accept verbal quotes or quotes delivered over email with no detail.
What a proper quote must include:
- Detailed scope of work describing exactly what will be done
- Materials list specifying brand names and product types (e.g., "Polyurethane injection — XYZ brand" not just "crack injection")
- Number of injection ports, straps, or anchors to be installed
- Warranty terms — duration, what is covered (labour/materials/both), what voids it, whether it is transferable
- Project timeline — start date, estimated duration, and completion date
- Total price with HST (13% in Ontario) broken out
- Whether engineering fees are included or separate
- Permit fees — included or separate
- Payment schedule — reasonable deposits (typically 30–50% maximum), milestone payments, and final payment upon completion and satisfaction
- Cleanup and site restoration details
When comparing quotes, look at the total scope, not just the price. A quote that is significantly lower than others may be omitting important elements. A quote that is significantly higher may include extras you do not need. Discuss differences with each contractor.
Step 4: Confirm Warranty on Repairs
Foundation repair warranties vary significantly. Understand exactly what you are getting:
- Manufacturer's warranty: Many carbon fibre strap, wall anchor, and injection resin manufacturers offer warranties of 10–25 years on their materials. These are valuable because they are backed by a national company.
- Contractor's labour warranty: Typically 1–5 years on the installation workmanship. Ask what would void the labour warranty (e.g., subsequent drainage changes, additional settlement).
- Transferability: A transferable warranty is valuable if you plan to sell your home within the warranty period. Some warranties are only for the original homeowner.
- Coverage limits: Some warranties only cover material replacement, not the labour to install the replacement. Read the fine print.
Be wary of "lifetime" warranties with no defined terms. A genuine lifetime warranty should specify what "lifetime" means (your lifetime? the building's life? the company's life?) and what it covers in writing.
Step 5: Check Permit Requirements
Confirm with the contractor whether your project requires a building permit. A reputable contractor will know the requirements for your municipality in Renfrew County and will either pull the permit themselves or guide you through the process. If a contractor suggests skipping permits to save time or paperwork, consider that a significant red flag. Unpermitted structural work can create major problems when you sell your home and may affect your insurance coverage.
Step 6: Get Completion Documentation with Warranty
Before making final payment, ensure you receive a complete documentation package including:
- Signed work completion certificate from the contractor
- Final inspection sign-off from the building department (if permits were required)
- Engineer's final letter of compliance (if an engineer was involved)
- Manufacturer warranty documentation for all installed materials — with model numbers, serial numbers if applicable, and effective dates
- Contractor's labour warranty certificate with terms, start date, and expiration date
- Paid invoice showing all charges and that the balance is zero
- Photographs of the completed work (many contractors provide before/after photos)
- Maintenance instructions for any products that require ongoing care (e.g., sump pump discharge line routing)
Store these documents in your home records file alongside your original purchase documents. If you sell the home, this documentation will be requested by buyers and their inspectors as proof of proper repair.
Questions to Ask Every Contractor
Ask these questions when interviewing potential contractors. The quality of the answers will tell you a lot about their expertise and integrity:
- How many foundation repair projects have you completed in Renfrew County in the last year?
- Can you provide references from properties within 30 km of my home?
- Will you involve a structural engineer if needed? If I already have an engineer's report, will you work with the engineer's design?
- Will you pull the building permit, or do I need to do that?
- What brand and type of injection resin / carbon fibre straps / wall anchors do you use, and why?
- What is the manufacturer's warranty on the materials you install?
- What is your labour warranty, and what does it cover specifically?
- What is the payment schedule? What percentage is due upfront?
- How do you handle unexpected conditions (e.g., hitting rock during excavation, discovering soil issues)?
- Who will be supervising the work on-site, and what are their qualifications?
Red Flags to Watch For
| Red Flag | Why It Matters |
|---|---|
| "Lifetime guarantee" with no written terms | Unenforceable; likely marketing language. Demand written terms specifying duration, coverage, and transferability. |
| Cash-only payments or demands for 75%+ deposit upfront | Potential tax evasion or fly-by-night operation. Reasonable deposits are 30–50% maximum. |
| No WSIB coverage or refuses to provide clearance letter | Illegal under Ontario law. You could be liable for on-site injuries. |
| Cannot provide recent Renfrew County references | Limited local experience. Foundation conditions vary significantly across the county. |
| Dismisses the need for engineer consultation | May be diagnosing without proper qualifications. Structural work requires engineering judgement. |
| High-pressure urgency claims ("crack is dangerous, fix today") | Legitimate foundation issues rarely require same-day decisions. A reputable contractor will give you time. |
| Won't provide written scope of work before starting | Leaves you without legal protection if disputes arise. Never approve work without written scope. |
| Suggests skipping permits to save time | Unethical and potentially illegal. Unpermitted work can complicate home sales and insurance claims. |
Completion Documentation Checklist
Before making your final payment, use this checklist to verify you have received everything:
Key Takeaway for Renfrew County Homeowners
The foundation repair contractor you hire is making a structural modification to your home that should last for decades. Do not base your decision on price alone. Verify credentials, compare scopes, read warranties, and get everything in writing. A well-vetted contractor with Renfrew County experience and proper documentation is worth paying more than the lowest bid. Explore our Cost Guide for pricing benchmarks and our Regulations Guide for permit and code requirements.