Measuring an Opening for a Custom Aluminum Door

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To measure an opening for a custom aluminum door, record the width and height at several points, plus the wall depth and the swing direction. Take every measurement at least twice, because walls and floors are rarely perfectly straight, and send the set to the manufacturer with photos before ordering.

Why Accurate Measurement Matters

A custom aluminum door is made to the exact size of your opening, so small errors can mean a door that does not fit or a costly remake. Unlike standard doors, there is no off-the-shelf size to fall back on. Good measurements save time, avoid unnecessary site visits and make the production process smooth from the first drawing to the installation day.

Measuring is also the moment to notice problems in the wall, such as an out-of-level threshold or a frame that is not square. Recording these details early lets the manufacturer plan the solution rather than discovering it on installation day.

Tools You Need Before You Start

Prepare a few simple tools so your numbers are reliable:

A steel tape measure, preferably 5 meters long
A notebook or phone to record each value immediately
A spirit level or laser level to check verticals and horizontals
A pencil and a simple sketch of the opening
A camera for photos of the frame, threshold and surroundings

Working with a helper makes it easier to hold the tape straight and read it accurately.

Measuring Width and Height Correctly

Measure the width at the top, middle and bottom of the opening, then use the smallest reading as the reference. Do the same for the height on the left, center and right. Walls often vary by a few millimeters, and the smallest dimension is the one the door must fit through.

Measure from the inside face of the frame to the inside face of the opposite side, and note whether the opening is intended for a door with a frame or only a leaf. Write every number with its location, for example 'width top 92.4, bottom 91.8'.

Checking Depth, Threshold and Swing

Depth is the thickness of the wall or the frame recess where the door will sit. Measure it at the top and bottom of the opening, because old openings are often uneven. Also check the threshold height and whether the floor is finished yet, since a tile layer can change the final clearance.

Decide the swing direction now: whether the door opens inward or outward, and to the left or right. Note which side the handle should be on and whether the door opens onto a balcony, hallway or room. Your sketch should show this clearly.

Documenting the Opening With Photos and a Sketch

Photos help the manufacturer understand what the measurements cannot show. Take a wide shot of the whole wall, close-ups of the frame corners, the threshold and any pipes, switches or uneven plaster near the opening. Label your sketch with the measurements, arrows for the swing and notes such as 'floor not yet finished'.

A clear set of photos and a simple drawing often answers questions before they are asked, which speeds up approval.

Sending Your Measurements for Review

Send the measurements, sketch and photos together so the manufacturer can check them against the site. Our team reviews each set and may ask for a site visit to confirm details before drawing the door. This review step is what turns your numbers into a reliable written specification.

Once you approve the drawing, production can begin in the factory, and the finished door is installed to the verified opening.

Frequently asked questions

Should I measure the frame or the wall opening?

Measure the opening between the inside faces of the frame or wall, and also note the frame dimensions if one exists. Both sets of numbers help the manufacturer decide how the new door will fit.

How many times should I measure?

Measure each dimension at least twice and at several points across the opening. Use the smallest width and height as your reference value.

Do I need to finish the floor before measuring?

It is best to know the final floor height, since tiles or screed change the threshold clearance. If the floor is not finished, note this clearly so it can be planned in advance.

What if the opening is not square?

A slightly out-of-square opening is common and can usually be handled in the design. Record the diagonal measurements and send photos so the manufacturer can plan the fit.

Common mistakes to avoid

The most common mistake is taking a single measurement and assuming the wall is straight and level. Forgetting to note the swing direction or the floor finish also causes avoidable changes after production has started.

Our recommendation

Measure at three points for each dimension, write everything down immediately, and send photos with a simple sketch. This habit alone prevents most fitting problems with custom aluminum doors.

Summary

Accurate measurement of width, height, depth, threshold and swing direction, supported by photos and a sketch, is the foundation of a well-fitting custom aluminum door.

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