Apartment Door Sizing for Buildings and Condominiums

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Apartment door sizing means measuring the actual opening, accounting for frame depth, floor finish and swing clearance, and confirming the final dimensions on site before production. For buildings, standardizing sizes across units simplifies ordering and installation, but each opening should still be measured individually.

Why Standard Sizes Alone Are Not Enough

Many building committees assume that all apartments share the same door dimensions. In practice, openings often vary by a few centimeters because of wall finishes, tile thickness, and the way each contractor framed the wall. Ordering from a single template without checking can leave a door that is too tight or leaves a visible gap.

Treat the building as a set of openings rather than a single size. Measure each one, then group the results into a few standard sizes that the factory can produce efficiently.

Measuring the Opening Correctly

Measure the clear width and height of the opening at three points, top, middle and bottom, and use the smallest figure. Include the finished wall surface, not the rough block. Note whether the floor is tiled or screeded, since threshold height changes the usable height.

Width at three heights
Height at three widths
Wall thickness at the lock side
Floor finish level at the threshold

Allowing for Frame, Clearance and Swing

A door is not sized to the opening alone. The frame takes up part of the space, and a small gap is needed around the leaf so it can open and close freely. The swing direction also matters: an inward-opening door needs clear floor space inside the apartment, while an outward-opening entrance needs room in the landing.

Exact clearance values depend on the door type and the hardware chosen, so these are confirmed with the engineer during the site visit rather than assumed from a general rule.

Iron Versus Aluminum for Building Entrances

Iron doors offer strength and a solid feel, which suits building entrances and security-sensitive areas. Aluminum doors are lighter, easier to operate, and well suited to sections with frequent use or where glazing is needed. The choice affects the weight the frame must carry, so the size and the material should be decided together.

For heavier iron leaves, the frame and hinge arrangement need to be specified in advance, because the door's mass influences how it should be anchored.

Planning a Batch for a Whole Building

When standardizing entrances across a building, collect every measurement first, then sort the openings into groups. Openings that differ by only a few millimeters can often share one drawing. Outliers should get their own specification rather than being forced into a standard size.

Ask each unit owner or the contractor for access on the same day, so the survey is consistent. A written schedule listing location, measurements and notes makes approval and production far smoother.

From Measurement to Approved Drawing

After the site visit, the factory prepares a drawing and a written specification showing dimensions, material, finish and swing direction. The property manager or committee reviews and approves it before production starts. Changes are much cheaper to make at the drawing stage than after fabrication.

Finishing such as hot-dip galvanizing or powder coating is included in the specification, along with the installation plan.

Frequently asked questions

Can one door size fit every apartment in a building?

Sometimes, but openings often vary slightly, so each one should be measured. Grouping similar openings into a few standard sizes is usually the most practical approach.

Where should the width be measured?

Measure at the top, middle and bottom of the opening and use the smallest reading. This accounts for walls that are not perfectly straight.

Does the floor finish affect the door height?

Yes. Tile or screed thickness changes the threshold level, which affects usable height and clearance, so it should be noted during measurement.

Is the swing direction part of the sizing?

It is. The direction determines the clear space needed on each side, so it should be decided together with the dimensions.

Common mistakes to avoid

Relying on a single standard size without measuring each opening is the most common error. Forgetting floor finish and swing clearance can leave a door that binds or cannot open fully.

Our recommendation

Survey every entrance on the same day, record three-point measurements and floor levels, then approve one written drawing per size group before production begins.

Summary

Accurate apartment door sizing comes from measuring each opening, allowing for frame, floor and swing, and approving a written drawing before fabrication.

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