Begin with the opening and its purpose
A large fixed unit, a mulled assembly and a new structural opening are different projects. Describe the view, daylight, ventilation and interior layout you want, then have the opening and support requirements assessed. Do not use a conceptual image as the manufacturing drawing.
Coordinate drawings and verification
Confirm who prepares the product schedule, any shop drawings and the site dimensions. Review frame profiles, joint positions, glass appearance, operating elements and interior and exterior finishes. Ask when the owner signs off and how a revision is recorded. Custom dimensions, finishes and shapes can restrict changes after manufacture begins.
Price the route to the opening
The delivery and lifting plan belongs in the proposal. Check driveway access, turns, doors, stairs, landscaping, decks and overhead obstructions. Ask whether equipment, traffic control or specialized handling is included. The ability to manufacture a unit does not establish that it can be delivered and installed safely at the site.
Think about future service
Ask how sealed glass or hardware could be replaced later and whether the assembly has a practical service route. Discuss cleaning and access to high glazing. Keep drawings, labels and installation photographs in the building record so a future service team can identify the system rather than starting from visual guesses.
Questions worth asking
- Is support and opening design confirmed?
- Who signs drawings and final dimensions?
- Are lifting and access costs included?
- How could the system be serviced later?
Further reading
Natural Resources Canada: window technology ↗Source checked October 16, 2026. Current requirements and eligibility need separate project-specific verification. This guide is an original planning explanation, not a product certification or installation instruction.
