Aluminum Window Installation Checklist for Homeowners

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Before signing off on new aluminum windows, check that each frame is level, plumb and securely fixed, that the seals and drainage are clean and intact, and that every sash opens, closes and locks smoothly. Confirm the glass, finish and cleanup match what was agreed in the written specification. Signing only after this walk-through protects you from defects that are harder to fix later.

Check the Frames and Fixing

Start with the frames themselves. Each window should sit square in its opening, with edges that look straight and joints that meet cleanly at the corners. Look for gaps between the frame and the wall, and make sure the fixing points are neat and not visibly stressed or cracked.

Frame is level and plumb, with no twist
Corners are tight with no visible gaps
Fixings are secure and not loose when lightly tested

Ask your installer whether the exact fixing method and any clearance values were checked with the engineer.

Inspect Sealing and Drainage

Water and air leaks are the most common complaints after installation. Run your hand around the perimeter where the frame meets the wall and look for uneven or missing sealant. Sealant should be smooth, continuous and fully bonded to both surfaces.

Also check that drainage openings at the sill are clear and not blocked by sealant or debris. A window that cannot drain will eventually leak, even if it looks perfect.

Test Operation and Hardware

Open and close every sash several times. It should move smoothly without grinding, catching or excessive force. Lock and unlock each handle, and confirm that the locking points engage firmly along the full length of the sash.

Opens and closes without sticking
Handles and locks feel solid
Sashes sit evenly with no rubbing against the frame
Any tilt or sliding mechanism works as demonstrated

Examine Glass and Finish

Look at each pane under daylight. Glass should be free of scratches, chips, bubbles or foreign material trapped between panes. Check that the glazing beads are seated evenly and that no sealant smears onto the glass surface.

On the aluminum itself, examine the finish for scratches, dents, uneven colour and runs. Compare the colour and finish with the approved sample or specification you signed earlier.

Confirm Cleanup and Protective Items

A professional installation leaves the area as it was found, apart from the new windows. Check the floor, sills and surrounding walls for paint splashes, sealant residue, metal shavings and dust. Remove any protective film only when you are ready, and make sure none is left stuck to the frame.

Take the opportunity to ask for any cleaning instructions for the aluminum and glass, so you protect the finish from the start.

Review the Paperwork Before Signing

Before you sign the completion form, make sure it matches the written specification and the drawings you approved. Confirm the number of units, sizes, opening types, colour and glass type. Note any snags on the form itself, with a clear date for when they will be corrected.

Keep copies of the specification, the signed form and any photos of the finished work. These records are valuable if questions come up later.

Frequently asked questions

Should I sign the completion form on the same day as installation?

It is better to walk through the checklist on the day, record any snags on the form, and sign once everything is confirmed. You can agree a short date for small corrections without signing off the whole job.

What if I find a small scratch on the frame?

Note it on the completion form with a photo and agree on how and when it will be repaired. Minor cosmetic marks are usually easier to address before sign-off than after.

How do I know if the window is installed level?

Use a spirit level on the frame edges and watch whether the sashes close evenly. If you are unsure, ask the installer to demonstrate and confirm the result with the engineer.

Can I test for leaks myself?

You can check the sealant visually and look for drips or stains after rain. For a fuller assessment, ask the installer to demonstrate how the drainage and sealing were completed.

Common mistakes to avoid

Many homeowners sign off quickly without testing every sash and lock, then discover problems months later. Skipping the sealant and drainage check is another common error that leads to leaks.

Our recommendation

Walk the whole job with the installer present, open every window, and note snags in writing on the completion form before signing. Keep photos and the approved specification together for your records.

Summary

A careful walk-through of frames, sealing, operation, glass, finish and paperwork lets you sign off aluminum windows with confidence.

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