Trades & Artisans

Glass and Aluminium Supply and Installation Agreement

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A professionally drafted contract template customized for your glass and aluminium business, ensuring clear scope, payment milestones, and liability protection.

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Glass and Aluminium Supply and Installation Agreement

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Running a glass and aluminium business means balancing precise manufacturing with on-site installation risks. Whether you are installing custom shopfronts, residential bi-folds, or glass balustrades, a handshake deal or a generic invoice description simply will not protect your margins. You need this agreement whenever you take on a new project to clearly define who is responsible for structural engineering, site measurements, and preparation work before your team even arrives. A great agreement does more than just secure your deposit; it sets realistic timelines for custom fabrication, establishes clear payment milestones tied to delivery and installation phases, and strictly limits your liability for existing structural defects or building movement. Having a robust contract in place gives your clients confidence in your professionalism while protecting your expensive materials and skilled labor from unpaid disputes, unexpected delays, and unfair backcharges on the job site.

What a good one includes

A highly detailed scope of work that specifies the exact window, door, or glass specifications, including glazing types, frame powder-coat colors, and compliance standards.
Clear site preparation requirements detailing the client’s responsibility to provide level openings, structural supports, and unobstructed access for your installation team.
A staged payment schedule requiring a non-refundable deposit to cover custom material orders before fabrication begins, followed by progress payments upon delivery and practical completion.
A formal variation process stating that any changes to measurements, glass specifications, or on-site adjustments must be agreed upon in writing before extra work begins.
A realistic lead-time clause that accounts for manufacturing delays beyond your control, such as glass tempering bottlenecks or custom powder-coating lead times, without penalizing your business.
A retention of title clause ensuring all glass and aluminium frames remain your legal property until the final invoice is paid in full.
A clear definition of what constitutes a manufacturing defect versus glass scratch tolerances according to national standards, limiting your liability for damage caused by other trades on site.

Common mistakes to avoid

Relying on the builder or client to supply final structural measurements instead of mandating that your team performs or formally signs off on the final site check-measure.
Failing to include a retention of title clause, which leaves you as an unsecured creditor if a builder goes bust with your expensive aluminium frames already installed on their site.
Neglecting to specify who is responsible for obtaining council approvals, engineering certifications, or crane hire for lifting heavy glass panels to upper floors.
Accepting verbal change orders on site without documenting the price adjustment, leading to unpaid disputes when the final invoice is issued.

Frequently asked questions

Who is responsible if the site measurements provided by the client are incorrect?

Your agreement should state that the client is liable for any remanufacturing costs if you fabricate materials based on measurements they provided. To protect your business, always include a clause that requires a formal variation and price adjustment if your team must alter frames on site due to inaccurate client dimensions.

How do I protect my expensive materials if they are delivered to the site but not yet installed?

A retention of title clause combined with a risk transfer clause is essential here. The contract must state that while legal ownership of the glass and aluminium remains with you until fully paid, the physical risk of damage or theft transfers to the client immediately upon delivery to the job site.

What happens if other trades scratch or damage the glass after we install it?

Your contract should include a practical completion sign-off process where the client inspects and signs off on the glass condition immediately after installation. Once this sign-off occurs, any subsequent damage or scratches caused by painters, renderers, or other trades becomes the client's sole financial responsibility.

Do I need engineering certification clauses in my contract for balustrades or pool fencing?

Yes, because load-bearing glass installations must comply with strict building codes. Your agreement must clearly state whether you are supplying the engineering computations or if the client must provide a certified structural backing before you can safely install the glass.

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Glass and Aluminium Supply and Installation Agreement

What a good one includes

Common mistakes to avoid

Frequently asked questions

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Don't do the work. Receive it.