What is the minimum size for an en-suite with shower, toilet and basin?

The absolute minimum size for an en-suite with a shower, toilet, and basin is approximately 1.4m x 1.8m (2.5 m²) using compact fittings like a quadrant shower, wall-hung toilet and cloakroom basin. For comfortable use, 1.6m x 2.2m (3.5 m²) is recommended. Space-saving choices such as back-to-wall toilets and wall-hung basins can reduce the footprint significantly.

Can I fit an en-suite in a 1.5m x 1.5m room?

A 1.5m x 1.5m room (2.25 m²) is very tight but can accommodate a shower and toilet without a basin, or a shower and basin without a toilet. To fit all three, you would need extremely compact fittings: an 800mm quadrant shower, wall-hung toilet (480mm projection), and a small cloakroom basin (350mm). It would work but feel cramped.

What type of toilet saves the most space?

Wall-hung toilets save the most floor space with a projection of approximately 480mm from the wall versus 650mm for a close-coupled toilet. The cistern is concealed in a furniture unit or wall void. Back-to-wall toilets are a good middle ground at 500mm projection and do not require a concealed cistern frame. Both options create a more open floor area.

Do I need planning permission for an en-suite?

You generally do not need planning permission to add an en-suite within your existing property footprint. However, Building Regulations approval is required for drainage connections, ventilation (Part F requires mechanical extract of 15 l/s intermittent), electrical work in a bathroom (Part P), and structural changes. You will need to notify your local Building Control or use a competent person scheme.

What door type is best for a small en-suite?

Sliding pocket doors or bi-fold doors are ideal for small en-suites as they do not swing into the room. A standard 762mm door needs 762mm clear swing space inside the room. Pocket doors slide into the wall cavity and use zero floor space. If using a hinged door, it should open outwards per Building Regulations to allow rescue access in an emergency.

En-Suite Minimum Size Calculator — Feasibility Check

Check whether your room dimensions can fit an en-suite bathroom with your desired fittings. Get suggested layouts and clearance verification.

Room Width

Internal width of the room

Room Length

Internal length of the room

Shower

Shower enclosure or wet room

Shower Type

Quadrant saves the most space

Toilet

WC/toilet

Toilet Type

Wall-hung saves the most space

Basin

Washbasin

Basin Type

Wall-hung or cloakroom saves space

How We Calculate This

This calculator determines whether your room can accommodate an en-suite by comparing the room dimensions against the combined footprint of your chosen fittings plus required clearances.

How it works

Fitting footprints: Each fitting has known dimensions based on standard UK products
Clearances: 600mm front clearance for toilet/basin use, 200mm side gaps between fittings
Layout options: Calculator tests linear and L-shaped layouts to find the best fit
Feasibility: Room is deemed feasible if any valid layout fits within the dimensions

Dimensions are based on standard UK sanitary ware sizes from manufacturers such as Ideal Standard, Roca, and Vitra. Clearances follow BS 6465 and Approved Document M guidance.

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.