Walk in shower with blue herringbone tiles at Albert Road, Ashford TW15, a Surrey Build Group project

3 October 2026, 2 minute read

Planning an ensuite in your loft conversion

Most loft conversions we build include an ensuite or bathroom. Here is how to plan one that fits the roof, drains properly and feels generous.

Short answer: an ensuite fits best in a loft when the shower sits under the highest part of the roof or in a dormer, the toilet and basin use the lower areas, and the room is positioned close to the soil stack below. Plan the drainage, ventilation and headroom at design stage and an ensuite can feel as generous as any bathroom in the house.

Use the roof shape

Headroom matters most where you stand, so the shower should go where the ceiling is highest, usually inside a dormer or under the ridge. Toilets, basins and baths can sit where the roof slopes down, because you are sitting or leaning forward when you use them.

A loft ensuite with a walk in shower at Raeburn, Surbiton
A loft ensuite with a walk in shower at Raeburn, Surbiton.

Drainage comes first

Waste pipes need a steady fall to the soil stack, so the closer the ensuite is to the existing stack, the simpler the plumbing. Where that is not possible, the layout and floor build up can be designed to carry pipes to where they need to go.

Ventilation and water

Every ensuite needs mechanical extraction. Water pressure on the top floor can be lower, so we check the supply and specify the right system for the shower you want.

Make it feel bigger

  • A walk in shower with a frameless screen keeps sight lines open.
  • Wall hung toilets and vanity units show more floor.
  • A roof window over the shower or basin brings in daylight.
  • Recessed niches in stud walls give storage without clutter.

How we handle it

We design the ensuite as part of the loft from the first sketch, so the stairs, bedroom and bathroom all work together. Clients can choose their own bathroom supplier, and we fit and tile to a high finish. See our loft conversions in Surrey.

Toilet ensuite, a Surrey Build Group project

Project Kick Start Meeting

Ready to talk about your project?

Book your Project Kick Start Meeting. We will talk through your plans, explain what is possible and follow up with a design and a fixed build price.

  • In house architects and structural engineers
  • Your build cost locked in when you appoint us
  • A dedicated site crew, project manager and project co-ordinator

Prefer to talk? Call 0203 603 9777 or email hello@surreybuild.co.uk.

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