The short answer: Start with a written scope for each opening. Compare the window, the installation method, the finishing, the warranty and the exclusions. Then compare the total and payment terms.
Why two quotes can be far apart
- Different products: Even within one brand, the series, frame and sash design, operating hardware, screens and finish can differ. Size, shape and opening style matter too.
- Different glass: Double- versus triple-pane, Low-E choices and other glass options change the product being priced. Ask for the exact package and relevant whole-window ratings.
- Different removal: An insert or full-frame replacement can involve a different amount of labour and leave different existing materials in place.
- Different installation work: Preparation, fastening, perimeter insulation, air sealing and water management may be described in very different levels of detail.
- Different finishing: One quote may include exterior trim or cladding, new interior casing, disposal and cleanup. Another may leave some of that work to the homeowner.
- Different responsibilities: Opening repairs, hidden damage, access, permits where required, painting and work around blinds or alarms may be included, excluded or priced later.
- Different service terms: Product and installation warranties, service-call charges and who handles future problems can differ even when the windows appear similar.
Which window are they actually quoting?
Ask for the manufacturer and exact product line or series for each opening. Confirm the frame material and design, operating style, glass package, Low-E coating, hardware, screen and written product warranty. Where available, compare whole-window performance ratings for the specified unit. The brand name alone is not enough to compare products.
What should a Calgary window quote show?
For each opening, look for the room or location, approximate size, configuration, product line, glass and options. For the job as a whole, ask for the removal and installation method, interior and exterior finishing, disposal, exclusions, written warranties, tax, total payable and payment schedule.
An estimate should make the materials, work and price clear. Alberta's hiring-a-contractor guidance explains what to look for in written estimates and contracts. Natural Resources Canada also explains the differences between window upgrade and replacement approaches in its window and door guidance.
A practical way to compare prices
- Match the openings. Are the same windows and doors included in both proposals?
- Match the products. Record the manufacturer, exact series, frame, operating style, glass, hardware, options and ratings for each opening.
- Match the work. Identify removal, installation, insulation, water protection and finishing.
- List the gaps. Write down exclusions, allowances and possible extras.
- Compare the money. Look at the total including tax, deposit, financing terms if offered, payment dates and warranties.
Ask each company: “Please show me exactly what is included for this price and what could cost extra.”
A lower quote may describe a simpler scope. A higher quote may include work or options you do not need. Neither price tells the whole story until the differences are written down.
Can a general price guide tell me what my house will cost?
It can help you identify cost factors, but it cannot price your particular openings or resolve missing details in a contractor's proposal. If you have two quotes that are far apart, the most useful first step is to identify where their scopes differ.
Randy's practical view: Don't ask only “Is this a good price?” Ask “What am I actually buying, who is doing the work, and what am I responsible for?” That is how the number starts to mean something.