Who Installs Aluminum Windows and What to Verify Before You Hire

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Aluminum windows are usually installed by a dedicated window fitter, a general contractor, or the manufacturer's own installation team. When you hire a fitter separately from the manufacturer, verify their experience with aluminum frames, their insurance, references, and whether they work to a written specification.

Who Typically Installs Aluminum Windows

Aluminum windows are most often fitted by one of three groups: a specialist window fitter, a general contractor who subcontracts the work, or the manufacturer's own installation crew. Each option has trade-offs in responsibility and coordination.

A specialist fitter focuses on frames and sealing and usually knows the common pitfalls of aluminum profiles. A general contractor may handle the wall openings and finishing at the same time, which can simplify scheduling. Buyers hiring a fitter separately from the manufacturer should clarify early who is responsible for measurements, delivery, and any adjustments after installation.

Experience With Aluminum Frames

Aluminum behaves differently from wood or PVC. It is light, strong, and thermally conductive, so the details of anchoring, sealing, and drainage matter. Ask how many aluminum window installations the fitter has completed and whether they can describe the sealing and thermal-break details they use.

A good fitter will be comfortable discussing the frame system, glazing options, and how the window connects to the waterproofing around the opening.

Insurance and Licensing

Ask for proof of liability insurance before work starts. Damage to walls, tiles, or neighboring property during installation is a real risk, and you should know who covers it. If the fitter works as a registered business, request the business details and confirm they match the person you are speaking with.

Liability insurance certificate
Business registration details
Name of the person who will supervise the work on site

Checking References and Past Work

Ask for references from recent aluminum window jobs, ideally in buildings similar to yours. Speak with the reference directly if possible and ask about punctuality, cleanliness, how problems were handled, and whether the windows still operate smoothly.

Photos of completed installations are useful, but ask to see work that is at least a year old if you can. Long-term performance shows how well the sealing and fixing were done.

Written Specification and Scope

A reliable installation begins with a written scope. It should list the windows being fitted, the fixing method, the sealing materials, what the fitter will remove or repair around the opening, and who is responsible for cleanup. Vague verbal agreements are the most common source of disputes.

Confirm whether the quote covers measurement, transport, lifting equipment, and finishing work such as sealant and trim. Make sure the specification matches the drawing you approved with the manufacturer.

Coordinating With the Manufacturer

When the windows are made by one company and installed by another, coordination matters. The fitter needs the correct frame dimensions, the opening tolerances, and the instructions for handling the profiles. Ask the manufacturer whether they provide installation guidance and whether they will inspect the result if something seems wrong.

Agree on who checks the windows on delivery and who is informed of any defects. Clear responsibility prevents delays when a problem appears after installation.

Frequently asked questions

Can I hire a window fitter who did not make the windows?

Yes, many buyers do. Just make sure the fitter has experience with aluminum frames and receives the manufacturer's drawings and installation instructions before starting.

What insurance should an aluminum window fitter have?

At minimum, ask for liability insurance that covers damage to property during the work. Request a copy of the certificate before the job begins.

How do I know if the installation was done properly?

Check that the frames are level, plumb, and square, that the windows open and close smoothly, and that the perimeter sealing is continuous. Ask the fitter to walk through the result with you.

Should the installation scope be in writing?

Yes. A written scope protects both sides and should cover fixing method, sealing, cleanup, and who handles any post-installation adjustments.

Common mistakes to avoid

A common mistake is hiring the cheapest fitter without checking experience or insurance, and then discovering poor sealing that leads to leaks. Another is skipping the written scope, which often leaves cleanup and repairs unresolved.

Our recommendation

Before signing with any fitter, request references from recent aluminum jobs, a copy of their insurance, and a written scope that matches the manufacturer's drawings. Inspect the first window closely before accepting the full job.

Summary

Verify a fitter's aluminum experience, insurance, references, and written scope before hiring them separately from the manufacturer. Clear coordination protects the quality of your windows.

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