Glass & Aluminium Installation Terms and Conditions

What a good one includes

• A clear process for how changes to custom measurements, frame colors, or glass specifications are documented and priced.
• Specific milestones for deposits, progress payments, and final balances, including clauses that retain ownership of materials until full payment is received.
• Provisions detailing the client’s responsibility to ensure structural openings are plumb, level, and clear of obstructions before your installation begins.
• A clause stating that risk of damage or theft passes to the client upon delivery to the site, even if installation is temporarily delayed.
• A defined timeframe for the client to report any visible glass or frame defects before the work is deemed accepted.
• Protection against liability for delays caused by weather, material supply chain shortages, or incomplete preparatory work by other trades.

Common mistakes to avoid

• Copying a basic construction contract that fails to address specific glass hazards like thermal breakage or powder-coat finishes.
• Assuming the builder knows the openings must be perfectly square and clean, which leads to unpaid standby hours when your team is blocked.
• Attaching the terms to the final invoice instead of securing a signed agreement before ordering expensive custom-cut materials.
• Not explicitly stating that you retain ownership of the aluminium frames and glass panels until the client's payment actually clears.

Frequently asked questions