Scheduling a Site Survey Before Ordering Custom Aluminum Windows

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A site survey is an on-site visit where the manufacturer measures each opening, checks the wall and frame conditions, and records the details needed to produce custom aluminum windows. Booking it before ordering prevents sizing errors and avoids remakes. Having the openings clear and the key questions ready makes the visit faster and the result more accurate.

Why a Site Survey Comes Before the Order

Custom aluminum windows are made to the exact size of your opening, so a site survey is the foundation of the whole project. Measurements taken from a plan or from memory often differ from the real wall by a few millimetres, and that difference can make a window impossible to install.

During the visit, the team sees the opening as it actually is. Out-of-square walls, uneven sills and existing structural elements are recorded before production starts, which protects both you and the manufacturer from costly corrections later.

How to Schedule the Visit

Start by sending the factory a few clear photos of each opening, together with the approximate number of windows and the floor they are on. This helps the team plan the visit and bring the right tools.

Choose a date when someone with decision-making authority can be present.
Confirm access to every floor and every room where windows will be fitted.
Make sure the work area is reasonably clear so the measurements can be taken safely.

What to Prepare Before the Surveyor Arrives

A little preparation saves time on the day. Remove furniture or curtains that block the frames, and point out any existing rails, pipes or electrical boxes near the openings. If you have a building plan or an architect's drawing, keep a copy available.

Also decide in advance which window types you are considering, such as sliding, casement or fixed units, and note any preferences for colour or opening direction so they can be discussed on site.

What Happens During the Measurement

The surveyor measures width and height at several points, checks diagonals to confirm squareness, and notes the depth of the wall and the condition of the surrounding surfaces. Each opening is documented in writing, often with photos and simple sketches.

You are welcome to walk along with the team, ask questions and point out anything unusual. Seeing the measurements being taken helps you understand why each window is sized the way it is.

From Measurements to Drawings and Approval

After the visit, the measurements are turned into drawings and a written specification that lists each window, its dimensions, profile type, glazing and finish. You review these documents and confirm them before anything goes into production.

Take your time with this step. Check that every opening is listed, that the opening directions are correct and that the finish matches what you chose. Approval at this stage is what allows the factory to start production with confidence.

Next Steps After the Survey

Once the drawings are approved, the windows are produced in the factory and finished before delivery. Installation is planned around your schedule, and the team coordinates with you or your contractor on the final fitting date.

Keep the approved specification and drawings in a safe place. They are useful reference documents for your contractor and for any future maintenance or additional orders.

Frequently asked questions

Is a site survey always necessary before ordering aluminum windows?

For custom work, yes. Because each window is made to the exact size of the opening, an on-site measurement is the most reliable way to avoid errors.

How long does a site survey usually take?

It depends on the number of openings and the building. Your contact at the factory can give you a realistic estimate once they know the scope of the project.

Do I need to be present during the visit?

It is strongly recommended. Your presence allows you to point out details, confirm window types and ask questions while the surveyor is on site.

Can I use my own measurements instead of a survey?

You can share your measurements as a starting point, but they should always be verified on site, since walls are rarely perfectly straight or square.

Common mistakes to avoid

Booking the order based on rough measurements without a site visit is the most common error and often leads to windows that do not fit. Another frequent mistake is forgetting to confirm the opening directions and finishes before approving the drawings.

Our recommendation

Walk each opening with the surveyor and ask them to explain the measurements aloud, then read the written specification line by line before signing off. Taking the time to check the drawings is the cheapest way to avoid rework.

Summary

A site survey is the essential first step in any custom aluminum window project, and preparing for it makes the whole process smoother and more accurate.

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