How to Measure Openings for Steel-Look Windows

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To measure for steel-look profile windows, record the width and height of the opening at three points each, use the smallest figure, and note the depth of the wall and any obstacles. Measure the actual opening, not the old frame, and record the figures in millimeters before sending them to the factory. Your technician will confirm the final dimensions on site before production starts.

Why accurate measurements matter

Steel-look profile windows and doors are made to measure, so every millimeter counts. A frame that is even slightly too large will not fit, and one that is too small leaves gaps that let in air, water and noise. Careful measuring at the start saves time, avoids reworking and keeps the project on schedule.

Remember that the frame is manufactured to fit the opening you have, not the other way round. This is why you should measure the opening itself and not rely on the size of an old window or a plan drawing.

Tools you need before you start

You do not need specialist equipment, but a few basic tools make the job much easier and more reliable:

A steel measuring tape, at least five meters long
A spirit level or a long straight batten
A notebook or your phone to record figures
A helper to hold the tape on larger openings

Work in millimeters throughout and write every figure down immediately, rather than trusting memory.

Measuring the width

Measure the width of the opening at the top, the middle and the bottom. Walls are rarely perfectly straight, and an opening can be a few millimeters narrower at one point than another. Note all three readings and use the smallest one as your working width, since the frame must fit through the narrowest point.

Measure from one inside edge of the reveal to the other, at the level of the finished wall surface. If plaster or tiles are not yet finished, mention this so the figure can be adjusted later.

Measuring the height

Follow the same method for height. Measure on the left side, the center and the right side, from the sill or threshold up to the lintel or underside of the beam. Again, use the smallest figure you recorded.

For doors, check the height carefully at the threshold, because a floor that is not level can change the usable height. Note whether you have a raised threshold, a step or a tiled floor that will still be laid.

Checking depth, squareness and obstacles

Measure the depth of the wall so the frame can be set correctly and the sealing is properly supported. Check that the corners are square by measuring both diagonals; if they differ by more than a few millimeters, tell your technician, because the opening may need attention before installation.

Wall depth at the top, middle and bottom
Diagonal measurements of the opening
Positions of pipes, electrical boxes, shutter boxes or air-conditioning sleeves
Any protruding tiles, skirting or plaster that affects the fit

Sending your figures and confirming on site

Send your recorded measurements together with clear photos of the opening, showing the surrounding wall and any obstacles. Label each figure, for example "width, top," so there is no confusion. Include a sketch if you have one, marking which side the window opens and where the handles will sit.

Measurements taken by the customer are a strong starting point, but a professional on-site measurement is what the order is based on. Before production begins, your technician will check the figures, and you will receive a written specification to approve.

Frequently asked questions

Should I measure the old window frame or the opening?

Always measure the opening itself, from wall to wall, because the new frame must fit the space as it is now. The old frame may be smaller or larger than the opening and is not a reliable guide.

Why should I use the smallest measurement?

The frame has to pass through the narrowest and shortest point of the opening. Using the smallest of your readings makes sure the frame fits everywhere without forcing it.

Do I need to measure again after the plaster is finished?

If the wall is not yet finished, tell your technician what finishes are still to come. Final dimensions should reflect the completed wall surface, so confirm the figures once plastering or tiling is done.

Can I measure the openings myself and skip the site visit?

You can prepare accurate figures yourself, which speeds up the process. However, a professional on-site measurement before production is recommended to catch hidden irregularities and confirm the final order.

Common mistakes to avoid

Measuring only once, or using the largest figure instead of the smallest, often leads to a frame that does not fit. Forgetting to note obstacles such as pipes, boxes or uneven floors can also cause costly delays.

Our recommendation

Take three readings for every dimension, write them down in millimeters and send photos with your figures. Confirm the final size with a technician on site before any order goes into production.

Summary

Measure the actual opening at three points for width and height, use the smallest readings, check depth, squareness and obstacles, and confirm everything on site before production.

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