Define the building and window scope
List internal and external panes, frames, tracks, screens, storeys, glazing type and any restricted areas. Share site hours, public access, nearby tenants, loading zones and building rules. Clarify whether the quote covers one visit, recurring maintenance or restoration work.
Assess access and safety arrangements
Ask how the provider proposes to reach each area and what site-specific equipment, training, approvals and insurance apply. Elevated, roof, rope-access or platform work requires appropriate specialist assessment. Do not assume any window-cleaning company can safely reach every pane.
Compare written proposals
Request the same information from each bidder: pane list, frames and screens, frequency, timing, access assumptions, exclusions, weather arrangements and price basis. Ask how inaccessible panes, defects, complaints and scope changes are handled. Cleaning does not repair failed seals, scratches or damaged glazing.
Plan business continuity
Agree how staff, visitors and tenants will be informed, how entry and public areas are managed, and who is the site contact. Confirm water use, runoff arrangements and work hours where relevant. Obtain written confirmation of the agreed scope before service begins.
