Count more than the visible glass
List interior and exterior panes, doors, partitions, sidelights, and any hard-to-reach glass. Mark whether frames, sills, tracks, and screens are included. These details help prevent two quotes from describing different jobs.
Identify deposits and sensitive surfaces
Point out paint, adhesive, mineral deposits, films, coatings, scratches, and damaged seals. Routine washing does not automatically include restoration or construction residue removal. Review glass and film manufacturer instructions before scraping or applying a specialty product.
Review both sides of the opening
Describe floor level, landscaping, furniture, locked rooms, pedestrian routes, and any equipment restrictions. Access above ground level needs a job-specific assessment. Do not assume lift, rope-access, roof-access, or other specialized work is included in a standard glass quote.
Choose a schedule based on the property
Evaluate how quickly the glass becomes visibly soiled and which elevations matter most. Entrances, sheltered panes, and exposed glass may need different intervals. A one-time clean can establish a starting condition before you agree on recurring maintenance.
Confirm the walkthrough checklist
Provide photographs, approximate pane counts, which sides need cleaning, and the work window. Confirm water access if relevant, protection of nearby finishes, and how remaining marks will be reviewed. Separate routine washing from stain treatment and repairs in the written proposal.