How to Measure a Bathroom

A Step-by-Step Guide for Accurate Planning

Whether you're planning a full renovation or just updating fixtures, measuring your bathroom accurately is the foundation of a successful design. From layout planning to fixture fitting, having the right measurements helps you make confident choices and avoid costly mistakes.

In this guide, we will walk you through how to measure a bathroom correctly, what tools you will need, and what to record for efficient planning.

Why Accurate Bathroom Measurements Matter

Bathrooms are often compact but complex. Every inch counts when fitting showers, baths, vanities or storage. Poor measurements can lead to issues such as misaligned fittings, insufficient clearance, or wasted budget. With precise dimensions, you can:

• Optimise layout and space

• Choose the right fixtures and furniture

• Ensure compliance with building regulations

• Improve functionality and flow

Tools You Will Need

Before you begin, gather these essentials:

• Tape measure (preferably 5m or longer)

• Plain paper or Graph paper

• Pencil and ruler

• Spirit level (optional, for checking surfaces)

• Camera or phone (to document the current layout)

  
  

Step-by-Step: How to Measure Your Bathroom

1. Sketch the Layout

Start by drawing the shape of your bathroom (bird’s eye view). It doesn’t need to be perfect, just a rough floor plan including all walls, doors, and windows.

Label each wall (Wall A, Wall B, etc.) and note which way the door swings.

See diagram below.

2. Measure Wall Lengths

Measure the length of each wall from corner to corner. Record measurements in millimetres or centimetres for greater accuracy.

Tip: Double-check each wall measurement by measuring the total width and length of the room.

3. Record Ceiling Height

Measure from floor to ceiling in several places, especially in older properties where ceiling height may vary. This is essential for fitting wall units, mirrors or vertical storage.

4. Measure Doors and Windows

Note the following for each door and window:

• Width of the door

• Direction the door swings (inwards or outwards)

• Width and height of the window

• Distance from the floor to the bottom of the window

• Distance the door/s and window/s are from adjacent walls

5. Note Architectural Features and Obstructions

Don’t forget to include features that affect design and installation, such as:

• Sloping ceilings

• Bulkheads

• Pipework runs

• Boxing or beams

• Alcoves or recesses

6. Take Photographs

Photos help provide context, especially if you're handing over your measurements to a designer or contractor. Snap each wall, door, and feature to pair with your notes.

Extra Tips for Bathroom Measuring Success

• Always measure twice to ensure accuracy.

• Round up to the nearest 5mm if unsure.

• Use arrows and labels to show dimensions on your sketch.

• Don’t forget to account for wall finishes (e.g. tiling or panelling may add depth). Specify if the measurements are without tiles (to the brick).

Final Thoughts

Knowing how to measure a bathroom correctly empowers you to make informed decisions, communicate clearly with professionals, and achieve a result that fits both your space and your lifestyle. With a few basic tools and careful notes, you’ll be one step closer to your dream bathroom.