Guide to Measuring Room Size

A simple guide to accurate room measurements

Room size is more than just a number. Providing accurate measurements helps set clear expectations and supports your property listing.

This guide shows you how to measure rooms properly, handle uneven shapes, and understand bedroom classifications.

Key takeaways

• Measure rectangular rooms by multiplying length × width
• Break down uneven rooms into smaller rectangles and add them together
• Bedroom classifications (single/double) are based on what fits comfortably

Why size matters

Room size can affect:

• How the property is marketed
• Buyer and renter interest
• Valuations and rental yield

Providing accurate measurements helps set clear expectations.

How to measure a rectangular or square room

Step-by-step

• Using a tape measure or laser measurer, take a measurement of the length and the width of the room (ideally, in metres)
• Multiply the length by width (i.e. 2.0m x 1.0m)
• The square metreage of the room will be the result (in the above example, 2m²)

How to measure uneven rooms

The simple method: split into rectangles

• Break the room down into smaller rectangles or squares, and calculate the m² of each shape, as shown above
• Once you have the m² of each smaller shape, add these together to get the total room m²
• If you need to further break the room down, you can calculate the m² of a triangle by following the above guidance, and then halving the result

Classifying bedroom sizes: single or double?

Although there's no legal minimum for bedroom sizes which applies across all housing circumstances (see HMO rules below), when specifying a bedroom size, consider the size of bed that fits comfortably in the room.

For example:

• Single Room: Comfortably fits a standard single bed
• Double Room: Comfortably fits a double bed

Minimum bedroom sizes for HMO licensing rules

There are minimum space standards that apply if you are letting a property as a HMO:

• At least 4.64 sqm (for one child under the age of 10 years)
• At least 6.51 sqm (for one person over 10 years old)
• At least 10.22 sqm (for two people over 10 years old)

These standards apply to England & Wales, and similar rules apply in Scotland, and Northern Ireland.