Measuring Door Frame Depth Before Ordering an Aluminum Door

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Measure frame depth from the inside face of the wall or frame edge to the outer face, at several points, and use the smallest reading. Pair it with the opening width and height, taken at top, middle, and bottom, so the door fits the actual opening rather than the plan.

Why frame depth matters for an aluminum door

Frame depth tells the manufacturer how deep the door set must sit within the wall opening. If the depth is wrong, the door may stand proud of the wall, leave a gap at the rear, or fail to seat its locking hardware properly. Depth affects how the frame is built, how the threshold meets the floor, and how the door closes.

Measuring depth early saves time, because a frame built for the wrong wall thickness can not be easily corrected once production has started.

Tools you need before you start

You do not need specialist equipment for this job. Gather a few simple tools so the readings are reliable:

A steel tape measure, preferably 5 meters long
A small spirit level or a long straight edge
A pencil and a notebook or your phone for photos
A helper to hold the tape at the far end of wide openings

Clear the opening of debris and remove any temporary spacers so you measure the real surfaces.

Step-by-step: measuring the depth

Measure the depth at the side of the opening at three heights: near the top, the middle, and near the floor. Run the tape from the inner face of the wall or existing frame straight back to the outer face you want the door to align with. Keep the tape square to the wall and avoid measuring along a curved or chipped edge.

Record each reading. Walls are rarely perfectly even, so the smallest value is the one that determines the fit. Repeat the same process on the other side of the opening.

Measure width and height the same way

Depth alone is not enough. Measure the clear opening width at the top, middle, and bottom, and the height at the left, center, and right. Openings often vary by a few millimeters, and the manufacturer needs the smallest width and the smallest height to plan a door that fits.

Also check whether the floor is level and note any tiles or screed that will change the finished threshold height. Mark the direction the door will open, since this affects hardware placement.

What to send with your inquiry

To get an accurate quote and drawing, send a clear set of information with your request. A good inquiry includes:

Depth, width, and height readings with the locations where you took them
Photos of the opening from the front and from the side
Notes on the wall material and the surrounding finish
The swing direction and whether the door is inward or outward opening

Complete measurements let the team prepare a written specification that you can approve before production begins.

From approval to installation

Once you approve the drawing, the door is manufactured in the factory to your measurements. Aluminum and iron doors then receive their finish, such as powder coating or hot-dip galvanizing where appropriate, before delivery. Installation is planned for the opening you measured, and on-site checks are made to confirm the frame sits plumb and level.

If the wall has changed since your first measurement, tell the team before approval, since small adjustments are easier to make at the drawing stage.

Checking the opening again before delivery

Plaster, tiling, and screed work can change the opening dimensions after your first measurement. Re-check depth, width, and height once the surrounding work is finished, or just before the installation date. A short second check often catches changes that would otherwise cause a poor fit.

Keep your notebook with the original readings and photos so you can compare them easily with the final opening.

Frequently asked questions

Which depth reading should I use for the order?

Use the smallest depth reading you took at the top, middle, and bottom of the opening. This ensures the frame will fit at the tightest point in the wall.

Do I need to measure before or after tiling?

Measure before tiling if possible, and then check again after the finish work. Tiles and screed change the threshold height and can alter the effective opening.

Can I order a door from my own rough measurements?

It is better to have the manufacturer or an installer take on-site measurements. Your readings are a useful starting point, but a professional check confirms the final dimensions.

What if my wall is not perfectly straight?

Record readings at several points and share the photos. The manufacturer can plan the frame around the variation, and precise values for structural details are checked with the engineer.

Common mistakes to avoid

Measuring only once, or using the largest reading instead of the smallest, is the most common error. Forgetting to note the swing direction or the finished floor height can also lead to a door that does not suit the opening.

Our recommendation

Take all readings with a helper, record each one with a photo, and send them together with the swing direction before requesting a drawing. Ask for a written specification to approve before production starts.

Summary

Measure frame depth at several points, use the smallest reading, and combine it with width and height. Accurate, documented measurements make ordering an aluminum or iron door straightforward.

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