Small Master bathroom Design

Minimum Bathroom Dimensions

(bath / shower combination with toilet and sink) 5ft x 8ft (1.5m x 2.4m). This is based on the minimum size of the bath so if you’re going for a bigger bath the 5ft side of this bathroom will change slightly.

This is one of the standard layouts for small bathroom floor plans.

Small bathroom dimensions (shower, toilet and sink) 6ft x 6ft (1.8m x 1.8m)

This is one of the standard layouts for small bathroom floor plans.

Half bathroom dimensions (toilet and corner sink, pocket door) 5ft x 3ft (1.5m x 0.9m). The minimum you're allowed by code in the US is 5ft x 2.5ft (1.5m x 0.76m). If you're one of my UK readers where there's no regulations (not sure about other places) a smaller arrangement is possible if you use a high wall mounted tank (dotted line) or space saving toilet.

Ceiling heights in bathrooms

If you're trying to sneak a bathroom into that area under the stairs or squeeze one into some left over loft space you need to check the rules about ceiling height. A good rule of thumb is that if you're going to stand (in front of the toilet, in front of the lavatory, in the shower then you need decent ceiling height.

A height of 6ft 8 ins (2.03m) is required in front of all fixture and for a 30 inch (76cm) diameter where the shower head is.

So I guess you can slot the back of the toilet and any portion of the bath that isn't a shower under a sloping ceiling.

Bathroom Fixture Dimensions and Clearances

In this bathroom dimensions section I've included:

The fixture sizes here will be a useful starting point for planning your bathroom but they come in all sorts of different shapes and sizes so once you've chosen your fixtures use those dimensions in your plans.

Toilet dimensions and clearances (same for bidets)

These measurements also apply to bidets.

Standard toilet fixture size – The standard depth of a toilet seat from hinges to the edge is 16 inches (40.5cm). If you get an elongated model this will be slightly longer – more like 18 inches or 46cm. Then you have the dimensions of the tank arrangements to add to this making the total depth from about 26 inches to 29 inches (66cm – 74cm). In Europe there are space saving options available that are smaller than this because there is no minimum size required for a toilet room.