Two window quotes can show the same total but offer very different value. Here are the seven items to compare line by line.
1. Glazing Specification
Look for: double or triple-pane, gas fill (argon or krypton), Low-E coating placement, and glass thickness. These determine 70% of thermal performance.
2. Frame Construction
UPVC chamber count (3 to 6), wall thickness (minimum 2.5 mm), and steel reinforcement on large units.
3. Hardware Quality
Stainless steel hinges, brass roller bearings, and multi-point locks add years to life. Plastic hardware fails first.
4. Installation Method
Replacement (insert) vs full frame replacement makes a huge difference. Full frame addresses any rot and is required for many rebates.
5. Warranty Detail
See our earlier post on window warranty in Quebec for what to check.
6. Rebate Eligibility
Ask whether the proposed models qualify for Rénoclimat and Canada Greener Homes rebates.
7. Lead Time and Schedule
Confirm manufacturing lead time and installation window. Quebec peak season runs May to September.
Frequently Asked Questions
Should I always pick the lowest quote?
Never on price alone — missing items in the cheap quote often surface as extra charges later.
What documents should the installer provide?
Itemized quote, RBQ license number, insurance certificate, and warranty documentation.
Is a 50% deposit standard?
30% is more common; avoid quotes asking for 50%+ upfront for residential work.