1. Home
  2. Help
  3. Measuring Guide For Doors

How to measure your door and frame

Below is a simple guide for measuring for a new door (and frame if required). This guide is by no means a definitive instruction manual so we recommend that you seek the assistance of a professional installer if you are in any way unsure as to how to do this. Also, please do bear in mind that there are many different variations of frames and building, often varying from area to area, which could affect the measurements needed and installation technique required.

Tips for Measuring Doors (fitted into existing frames)

Guidelines for measuring a door

If you have an existing door then the easiest thing to do is to measure that.

If you have a frame with no door then the measurements should be taken from the inside of the frame where the door will fit.

First measure the height of the actual opening on both sides (shown as H1 & H2 in the image to the left).

Now measure the width of the door at the top & bottom (shown as W1 & W2 in the same image).

You should also measure the thickness of the door which will be fitted.

Use the larger of both sets of measurements as the size you require. Doors are sold in standard sizes so you then need to choose carefully the closest match to your measurements. For example, if you have measured 1975mm (77¾") high x 758mm (29.85") wide x 36mm (1.4") thick then the standard door size to select is 1981mm (78") high x 762mm (30") wide x 35mm (1.4") thick.

Tips for Measuring Doors and frames

Guidelines for measuring a door with a new frame

This guide covers frames which are fitted into the brickwork (or the structural opening for timber constructions) and not for frames fitted in check (behind the brickwork). The image shows a frame with a cill but much the same methodology is employed when measuring a frame without a cill Click to view image for measuring a door and frame without a cill

First measure the height of the actual brickwork sizes (shown as H1, H2 & H3 in the image to the left).

Now measure again for the width of the actual brickwork at the top, middle & bottom (shown as W1, W2 & W3 in the same image).

Use the average of each set of measurements to ascertain the overall structural opening.

When ordering a frame it is usual to allow a fitting clearance to ensure it goes into the structural opening without having to force anything into position as this can knock the frame out of square and make operation difficult. With this in mind you need to deduct a clearance. This should normally be around 10mm (0.4").

Deduct your required clearance off the structural measurements you calculated above. This is the measurement you should use when ordering doors with frames from us.

Legal Disclaimer: Use these tips as a guide only and seek professional advise before ordering any items. Distinctive Doors cannot be held responsible for incorrect measurements.