Bathroom Design Cost Calculator
Design is sold three ways and priced three ways. This works out what each route actually costs against the build you are planning.
Open the calculator →Price your design in 30 seconds
3 steps. Build budget, design route and region.
How this calculator works
Design is the cheapest stage to change your mind on. Moving a WC on paper costs nothing; moving it after the floor is up costs £800 to £2,000. That is the whole argument for paying for design, and it only applies when the layout is actually changing.
Showroom design is genuinely useful if you were buying the suite there anyway. What you are trading is independence — the specification comes from one range, and the design cost sits inside the product price rather than on an invoice.
Full service is priced as a percentage because the work scales with the build. On a £6,000 refit it rarely pays; on a £20,000 master suite with trades to coordinate, it often does.
Bathroom design fees (2026)
| Route | Typical 2026 cost | Notes |
|---|---|---|
| Showroom design with purchase | £0 — priced into the suite | One retailer’s range only |
| Measured survey only | £150–£350 | Drawings for you or your fitter |
| Independent designer | £300–£1,200 | Brand-neutral specification |
| Full service, design + PM | 8–12% of build cost | Trades coordinated and inspected |
| Moving a WC on paper | £0 | The reason design pays for itself |
| Moving a WC after the floor is up | £800–£2,000+ | Structural, often building control |
Figures match our bathroom design cost guide.
Bathroom design calculator FAQs
Usually not. If the bath, basin and WC stay where they are and you are happy with the look, a good fitter and a showroom visit will get you there.
Survey, drawings, specification, then coordinating and inspecting the trades. The percentage covers the management as much as the drawing, which is why it only pays on larger builds.
It costs nothing extra, but it is paid for in the suite price and specifies from that retailer’s range. Fine if you were buying there; limiting if you want to shop around.
A measured survey, scaled plan and elevations, a full specification, and the services layout. If the services layout is missing, ask for it — it is the part your fitter needs most.
Related cost guides
- Design cost guide — what each route includes
- Full bathroom costs — the build the design is for
- Planning a renovation — step by step
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