Bathroom Renovation Cost UK (2026): What a Realistic Budget Looks Like

Ask three people what a bathroom renovation costs and you'll get three very different answers, because "bathroom renovation" isn't one job — it's four different jobs that happen to end up in the same room. Here's what each one actually costs, and where the money really goes.

The Four Scopes, and What Each Actually Costs

• Cosmetic refresh (new taps, shower, seals and paint, keeping the existing layout and tiles) — £1,200–£3,000
• Full replacement, same layout (strip out, new suite and tiling, pipework stays where it is) — £5,500–£11,000
• New layout (moving the bath, basin and WC to different positions) — £8,000–£16,000
• Creating a new bathroom or en-suite (in a bedroom, loft or box room with no existing plumbing) — £9,000–£18,000

The jump between "same layout" and "new layout" is the single biggest decision in the budget. Keeping fittings where they already are means the existing waste falls and soil stack connections stay put. Move them, and you're paying for new pipe runs, possibly through joists, and sometimes a change to the soil stack itself — that's what drives the extra £2,500–£5,000, not the tiles or the suite.

Specification Moves the Number More Than People Expect

• Budget (high-street suite, ceramic tiles) — roughly 30% below mid-range
• Mid-range (branded brassware, porcelain tiles, a decent shower screen) — the baseline above
• High end (designer brassware, large-format porcelain, stone resin) — roughly 55% above mid-range

Two bathrooms with an identical layout and scope of work can land £4,000 apart purely on spec — worth deciding upfront rather than discovering it fitting-by-fitting.

The Extras That Aren't Optional, Whatever the Quote Says

• Full tanking to the wet areas — £400–£1,100. Do not let anyone talk you out of this — it's what stops a small leak at a shower tray or bath edge becoming a rotten floor or a ceiling collapse in the room below.
• A proper extractor ducted to outside — £250–£700. The single best defence against black mould, and worth reading alongside our guide on condensation and black mould causes.
• Wet room floor former and drainage — £1,600–£4,500
• Electric underfloor heating — £500–£1,400
• Shower pump or mains booster — £600–£1,600, common in older houses with low water pressure
• Macerator or pumped waste, where there's no gravity fall to the soil stack — £700–£1,800
• Moving or renewing the soil pipe — £900–£3,200
• Strengthening or notching joists for a new bathroom — £800–£2,600
• Replacing the bathroom window — £600–£1,600
• Re-plastering or boarding out — £600–£1,800

Electrics in a Bathroom Are Notifiable Work

Any electrical work in a bathroom — a new shaver socket, extractor wiring, underfloor heating — is notifiable under Part P of the Building Regulations. Get the completion certificate as a matter of course, not just a verbal assurance it's been done properly. It matters at resale as much as it does for safety.

Why Cheap Bathrooms Fail at the Joints

The single most common bathroom failure isn't a burst pipe — it's water finding its way past a poorly sealed shower tray edge or an untanked stud wall, sitting there for months, and turning up as a stain on the ceiling below or a soft patch of chipboard flooring. Tanking and a properly bedded tray cost a few hundred pounds. Skipping them can cost the whole ceiling.