Insulation is one of the most cost-effective home improvements you can make in Renfrew County — but only if it's installed correctly. A poorly installed R-49 attic job can perform at R-30 in real-world conditions due to gaps, compression, or coverage gaps around obstructions. The contractor you choose matters as much as the material they use. Here's how to select the right one.
Step 1 — Get 3 Written Quotes (and Compare the Right Things)
Always get a minimum of three written quotes before committing to any contractor. When reviewing them, resist the urge to compare only the bottom-line price. Look at what each quote actually specifies: the insulation type, the R-value to be achieved, the brand, the method of installation, and the area covered. A quote that's $800 cheaper may be proposing a lower-grade product or leaving critical areas uncovered. A quote that specifies coverage depth per area (in bags per 1,000 sq ft for blown-in, for example) shows a contractor who knows what they're doing.
Step 2 — Ask About TECA Certification
The Thermal Environmental Comfort Association (TECA) offers training and certification for insulation contractors in Canada. There is no provincial licence required to install insulation in Ontario, so TECA certification is one of the few meaningful credentials you can ask about. A TECA-certified installer has received product-specific training and understands installation best practices — both of which directly affect thermal performance. Certification isn't mandatory, but it's a meaningful differentiator, especially for spray foam work where technique significantly affects outcome.
Step 3 — Verify WSIB Clearance
This step is non-negotiable. Visit wsib.ca and use the Clearance Certificate lookup to confirm your contractor is current with WSIB (Workplace Safety and Insurance Board) coverage. If a worker is injured on your property and the contractor has no WSIB coverage, you may be held liable. A legitimate contractor will have no hesitation providing their WSIB account number and will encourage you to verify it independently.
Step 4 — Ask for References from Similar Project Types
Attic insulation, basement wall insulation, and exterior wall cavity insulation are meaningfully different scopes of work. A contractor who excels at blown-in attic insulation may have limited experience with spray foam basement walls. When requesting references, be specific: ask for two or three homeowners with a project similar to yours — same area of the home, same insulation type. Follow up with those references and ask about the cleanliness of the work, whether the specified R-value was confirmed, and whether there were any issues after the project.
Step 5 — Confirm Product Specifications in Writing
Before work begins, you should have written confirmation of: the insulation material (fibreglass batt, blown-in cellulose, closed-cell spray foam, etc.), the R-value per inch, the total target R-value for each area, the brand and product name, and the installed coverage density. This protects you in two ways: it prevents unauthorized product substitution on installation day, and it gives you documentation if you later apply for EnerGuide-based programs that require proof of upgraded specifications.
Step 6 — Understand EnerGuide Audit Requirements for Grants
If you're planning to apply for the Canada Greener Homes Loan, an EnerGuide audit by an NRCan-registered energy advisor is required both before and after the insulation upgrade. The pre-audit establishes your baseline energy rating and recommends upgrades; the post-audit confirms improvements. Make sure your contractor is familiar with the documentation requirements for these programs. Choosing an upgrade recommended in your pre-audit report maximizes your grant eligibility and ensures the work qualifies. See our full guide to hiring a contractor in Ontario for general vetting principles that apply across all trades.
Step 7 — Get a Written Contract with Start/Completion Dates and Cleanup
Your final contract should clearly state: the full scope of work by area, all product specifications agreed upon, payment schedule tied to milestones, the start date, an estimated completion date, and explicit confirmation that cleanup and debris removal are included. Blown-in insulation, spray foam, and batt installation all produce waste — foam packaging, loose material, plastic sheating — that must be removed. Don't assume it's included. If it's not in the contract, it's negotiable before signing and much harder to enforce after.
Red Flags to Watch For
- No written quote — any contractor unwilling to put the scope in writing before you commit is a liability.
- Pushing the highest-cost option without clear explanation — spray foam has a place, but so does blown-in cellulose. If a contractor can't explain why one material is better for your specific situation, that's a problem.
- No WSIB clearance — not optional. If they can't provide a clearance certificate number, walk away.
- Vague or verbal product specifications — "good quality insulation" is not a specification. Get the brand, product name, and R-value in writing.
- Unusually low bids without explanation — a quote significantly below market may indicate lower-than-specified material, inadequate coverage, or a contractor who will cut corners.