Window Installation Contract: What to Check

Published 10 November 2026. Updated 10 November 2026. Editorial team

A window installation contract should name every window with its size, frame, glass and hardware; give an itemised price; tie payments to stages of work; set delivery and installation dates; state separate warranties for the windows and the installation; and describe the handover. In the UAE, consumer contracts and invoices must be in Arabic, with English alongside if needed.

In short

• The quotation is part of the contract: attach it and sign every page.
• Each payment follows an event you can check.
• Dates, not "approximately four weeks".
• Two warranties: on the product and on the installation.
• Handover is a signed document with a list of defects, if any.

What should the aluminium windows quotation include?

The quotation is where most disputes start, so make it specific. For every opening it should list:

Ask for each line to carry its own price. A single total hides what is missing, and two quotes cannot be compared without a breakdown. How to choose the frame and the glass is covered in aluminium vs uPVC windows and double glazed windows.

What does UAE law say about the paperwork?

The UAE Federal Law No. 15 of 2020 on Consumer Protection sets several rules that apply to a window order:

• The provider must give a detailed invoice with its trade name and address, and the type, price and details of the goods or service.
• The invoice must be in Arabic; another language may be added.
• Contracts, data and advertising for consumers must be in Arabic, and other languages may be used alongside.
• Any term in a contract or invoice that would exempt the provider from its duties under the Law is void.

So a clause such as "no claims accepted after installation" does not remove the installer's obligations. Keep the Arabic version together with the English one, and check that both say the same.

How should payments be staged?

Link every payment to an event that both sides can see, for example in three steps:

1. an advance when the contract is signed and the final measurement is done;
2. a second payment when the windows are delivered to site;
3. the balance after installation and a signed handover.

Write the amount or percentage of each step into the contract. Make the last payment after handover: it is the part that brings the installer back to fix defects found at sign-off.

Which dates belong in the contract?

Write calendar dates for the final measurement, delivery and completion of installation. "Four to six weeks" leaves the start date open. Ask what happens if the date slips: a reduction per day of delay, or the right to cancel and recover the advance. For a villa with many openings, ask whether the windows arrive in one batch or several.

What should the warranty cover?

There are two separate things to guarantee. The windows themselves are covered by the manufacturer of the system and the glass. The installation is the installer's work: fixing, sealing, adjustment and drainage. A leak at the joint is an installation defect, even if the window is perfect.

UAE law requires the provider to honour warranties and after-sales service during the stated period, and to guarantee a service against defects for a period that fits its nature. If the service has a flaw, the provider must provide it again correctly without charge or return all or part of the amount paid. Contracts must say how repairs, replacement or refunds are handled and within what time.

In practice, ask for:

• the warranty period on the windows and, separately, on the installation;
• a list of what is covered: frame, glass unit, hardware, seals, joint;
• how to report a defect and how fast the installer responds;
• whether adjustment visits after installation are included, and how many.

Russian practice is one example of how this is set: the national standard for uPVC windows, GOST 30674, recommends that the installation warranty should run for the same term as the window warranty.

How should the installation be described?

The contract or its annex should state how the gap between frame and wall will be closed. A sound joint has three layers: an outer one against rain, sun and dust, a middle insulating layer and an inner vapour barrier. Ask for the materials of each layer and for the method of fixing the frame.

Ask too who repairs the reveals and plaster after the old frames come out, and whether the price includes it.

What does handover look like?

The work ends with a signed handover document. If something is wrong, it lists the defects and a date to fix them. In the Russian example, the joint standard GOST 30971 asks for a separate record of the hidden work, signed before the joint is covered by trims, so its build can be checked. Ask for both records: how the joint was made and the acceptance of the finished windows.

What to check on the day is covered in the window installation checklist.

Questions to ask before you sign

• Is the quotation attached, and does each item have a price?
• Are the system, glass formula and hardware named?
• Which dates are fixed, and what if they slip?
• What triggers each payment?
• What warranty covers the windows, and what covers the installation?
• Are removal, waste disposal and finishing included?
• Is there an Arabic version, and does it match the English?
• If the building management needs to approve facade works, who arranges it?

Installers can be compared by open prices, warranties and reviews in the Dubai window company ranking. The overall choice of windows is in which windows are best for your home.

Questions and answers

What should a window replacement contract include?

Sizes and specification of every window, an itemised price, payment stages, dates, two warranties and the handover procedure.

Does the contract have to be in Arabic?

Under UAE consumer law, consumer contracts and invoices must be in Arabic; another language may be added.

Can a contract exclude the installer's liability?

No. A term that exempts the provider from its duties under the Consumer Protection Law is void.

When should the last payment be made?

After installation and a signed handover, with any listed defects fixed.

Sources

• UAE Federal Law No. 15 of 2020 on Consumer Protection, articles 8, 10, 12, 15, 21 and 26, English text on the UAE legislation portal. Russian standards for uPVC windows and installation joints. Checked in November 2026.