The starting question: What am I getting for this price, what is missing, and who is responsible if something goes wrong?
1. Match the windows opening by opening
Ask for a schedule that identifies each room or location, approximate size, window style, fixed and opening sections, colour and important options. “Three bedroom windows” is too vague to compare. A casement, slider, fixed window and combination unit can have different costs and functions.
- Is every opening on both quotes?
- Do the configurations and approximate sizes match?
- Are any changes to the opening or special safety requirements identified for verification?
2. Identify the actual product
A manufacturer name alone does not identify the product line. Compare the frame, operating hardware, glass package, number of panes, Low-E coating, gas fill, screens, grilles and colour. Ask for whole-window performance ratings for the exact units where available. A strong glass package does not make up for an unclear installation scope.
3. Find out what “replacement” means
An insert installation keeps parts of the existing frame. A full-frame installation removes the old frame to expose more of the opening. Either approach can be appropriate, depending on the condition of the opening and the result you want. The quote should show exactly what stays and what is removed.
Please confirm whether this is insert or full-frame replacement and identify which existing window parts will remain.
4. Compare the work around the window
“Professional installation included” does not tell you how the window connects to the house. Ask what is included for:
- Removal, protection of floors and furniture, and disposal.
- Positioning, support and fastening.
- Perimeter insulation, interior air sealing and exterior water management.
- Exterior trim or cladding, sealants and repairs to adjacent finishes.
- Interior jambs, casing, caulking, painting and cleanup.
The exact construction details depend on the product and wall. The contractor should explain the proposed method for your openings.
5. Put exclusions and possible extras in writing
Confirm who handles blinds, alarm contacts, drywall, paint, siding or stucco repairs, structural work and permits where applicable. Ask how unexpected damage will be documented, priced and approved before extra work begins. An exclusion can be reasonable; a surprise after work starts is harder to manage.
6. Read both warranties
The manufacturer's product warranty and the contractor's installation warranty are separate. Check coverage for glass, frames, hardware, labour, service calls, travel charges and any registration or transfer conditions. “Lifetime warranty” needs a written explanation of what it covers.
7. Compare the full cost
If the numbers are far apart, start with why Calgary window replacement quotes vary—including the exact product each company is proposing.
Once the scopes are clear, compare the price before tax, GST, total, deposit, financing terms if used, payment schedule, quote expiry and change-order process. The lowest price is not automatically the best value, and a higher price is not proof of a better job.
Questions to send each contractor
- Which product line and glass package are included for each opening?
- What existing components remain after removal?
- How will the opening be insulated, air-sealed and protected from water?
- Are interior finishing, exterior finishing, removal and disposal included?
- What is excluded, and how would an extra charge be approved?
- May I have the written product and labour warranties?
Randy's practical view: If two quotes are far apart, find the differences in scope first. Ask each company to put important explanations into the written quote before signing.