Chapter 1

How to Take Measurements and Prepare for Your Bathtub

The first step to take when planning your bathtub purchase is to take the critical measurements to determine the maximum size of your bathtub. Simply taking the length, breadth and height measurements of your available space is often not enough. In many cases, factors such as the orientation of your bathroom door can lead to a big reduction in the maximum allowable length when selecting your bathtub.

This complete measurement guide will teach you step by step how to take the critical measurements quickly and accurately. It also highlights considerations that some contractors and IDs miss out on, so that you can take note of it and remind them.

Here is the list of critical measurements:

  1. Wall-to-Wall Measurements
  2. Door-to-Door Width
  3. Length of Allocated Space for Bathtub
  4. Width of Allocated Space Bathtub
  5. Height of the Faucet from where the Bathtub would be installed
  6. Space Allowance for Bathtub Rotation


1. Wall-to-Wall Measurements

The first measurements are for the walls of your bathroom. In particular the ones that the bathtub will be placed against. Do consider the distance you would like your bathtub to be installed from the wall, as there might be silicone-filling or cementing work done.

Protip!?: To take accurate measurements with a measuring tape, put the measuring tape on the ground and align the measuring tape to touch against the wall. This will avoid errors caused by slanting. 

Be extra careful when you take your measurements. Bathtub that are mounted against the walls (alcove bathtubs) require a perfect fit; even a 1-2cm error cannot be tolerated. 

If you are unsure of how specific your measurements are, don’t hesitate to call on specialists who will guide you through the entire process.

You may alternatively opt to follow your home’s layout plan if your house has yet to be fixed. But the best option would be to show your layout plan to an expert as there may be certain aspects, like fixtures, that cannot be visualised on the plan.


2. Door-to-Door Width

Start by measuring the width of one end of your door to the other. These measurements will help ensure the unimpeded movement of the bathtub entering to the bathroom and to avoid any unnecessary complications, like hacking the door down or having to replace a new bathtub. There have been cases where users have taken all the crucial measurements, but are disappointed when the bathtub arrives, as they forgotten to measure their door-to-door widths and the bathtub could not fit through the door. This complication usually happens with sitting bathtubs

Hallway Measurements

Mostly applicable to small homes like Sohos (Small Offices/ Home Offices) or ECs (Executive Condos) might encounter difficulty in manoeuvring the bathtubs around the house, in order to get the bathtub from your front door to your bathroom door. You may want to discuss with your Bathtub expert to advise the best way to shift your bathtub to your bathroom.

3. Length of Allocated Space for Bathtub

Measuring from the wall would be the best option, as most bathtubs are either mounted against the wall (alcove tub) or sealed with silicon (drop-in) to prevent dust and dirt from accumulating.
Freestanding Bathtubs require additional space around it, as such, do take note to accommodate more space accordingly.

For users who are getting or contemplating to get a corner bathtub, do measure the length of the allocated space from the corner all the way out. Refer to diagram below to visualise what it will look like when your corner bathtub is placed.

4. Width of Allocated Space for Bathtub

The same goes for the allocated width space for the bathtub, where the measurements should be taken from the wall (where the tub will be mounted or sealed with silicon) all the way to where the tub would end outwards.

The allocated width measurement for a corner bathtub should not differ much from the allocated length, as it is usually shaped after a quadrant or a small squarish shape. Hence the 90 degree angle almost guarantees that the bathtub will have an identical width and length, like that of a square. In this way, you may further verify if the measurements you have taken so far have been accurate. Refer to diagram below.

5. Height from Faucet to where Bathtub would be Installed

If you have an existing faucet or fixture, this is an important measurement to perceive. Measure the faucet’s height from where the bathtub would be installed. You will need to ensure that the distance accounts for the maximum height of the bathtub, so that the faucet would not need to be shifted.

6. Space Allowance for Bathtub Rotation

Finally, the last but not least important point to pay attention to, would be the space allowance for bathtub rotation. What this means, is the amount of space available for the bathtub to be shifted in the bathroom.

Should the bathtub not be directly aligned with the door when it enters the doorway, it has to be moved in order to fit into the designated bathtub area.

To do this, some allowance of space is required to carry out this act. Refer to the red arrows to understand better the angles and distance away from the wall there needs to be, for the bathtub to turn.

Keep in mind the other fixtures that may already exist in your bathroom and gauge correspondingly. If you are unsure of how to allocate the appropriate space allowance, you may always arrange a site visit with an expert and get their advise.

Space Allocation for Bathtub Vertically Allocated to the Door


Space Allocation for Bathtub Parallel Allocated to the Door


By following the steps in this guide, you would have taken the necessary steps to measuring and preparing for your bathtub and to avoid complications during installation and have a smooth renovation. The next section will tell you about the different type of bathtubs so you can be better informed to select your dream bathtub!

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