Start with the spaces people use
Describe the problem by room or elevation: afternoon light on workstations, a storefront display, or privacy in a meeting room. Record the times of day, the views and daylight you want to keep, and who will review a sample.
Agree on the project’s priority before comparing products. A single request for “darker windows” leaves too much undecided.
Build a glazing schedule
Create an elevation or room-by-room glazing schedule. List the panes in scope, their dimensions, known glass types and coatings, existing film or damage, and any details the installer still needs to verify.
Ask for written suitability and warranty information for the actual film, glass and installation surface. Use the existing-glass checklist for the shared compatibility questions; do not assume every window in the building is the same.
Separate product ratings from project estimates
Request the exact product name, its performance sheet and the glass used for the stated results. The architectural ratings guide explains reference glazing and how to check a claimed certification.
Keep energy estimates separate from product ratings. Ask for the assumptions behind an estimate for your building, including occupancy, climate, orientation, existing glass, and energy rates. A percentage on a film sheet is not a promised percentage reduction in your bill.
For safety, security or code-related objectives, ask a qualified specifier to identify the required system and supporting evidence. Agree who will review the proposal before work is approved.
Put the work and price in writing
- Identify the included panes and the exact film, with any exclusions.
- Define access, operating hours, and occupant communication.
- Ask what preparation, existing-film removal and protection of nearby finishes are included.
- Record the agreed sample and acceptance process.
- Ask for a written price against that scope, including how changes or additional work will be agreed.
Keep proposals tied to the same scope so you can see what each installer has actually included. Resolve access and scheduling questions with the people responsible for the property.
Agree on inspection and handover
Confirm who owns warranty and maintenance records, who receives the care instructions, and whom occupants should contact with concerns. Ask when and under what conditions the finished work will be assessed.
Review the installation-review guidance with the installer rather than assuming a universal curing deadline. Keep the product details and agreed sample with the project records.