What Affects the Cost

The single biggest cost driver is whether you move any plumbing. Keeping the toilet, basin, and shower in exactly their existing positions costs far less than relocating waste pipes or rerouting supply lines through floor joists or stud walls. Even shifting a toilet by half a metre can add £500–£1,000 to a quote. For more context on what’s involved, see our complete plumbing guide.

Suite and fixture quality spans an enormous range. A basic close-coupled toilet, pedestal basin, and acrylic bath can be sourced for under £500 combined. A wall-hung toilet with concealed cistern, countertop basin, and freestanding bath can exceed £4,000 in materials alone before a tradesman sets foot in the room.

Tiling is frequently underestimated. Large-format porcelain tiles, heated floors, or full floor-to-ceiling tiling in a family bathroom can push materials and labour past £2,500 on their own. Smaller ceramic tiles in a compact en-suite cost significantly less.

Whether you need electrical work is a critical variable. Adding or moving a shower circuit, installing a heated towel rail, or fitting a new extractor fan must be done by a qualified electrician in a bathroom (Part P of the Building Regulations). This typically adds £300–£700 to the project.

Labour rates vary considerably by trade. A bathroom fitter who handles plumbing, tiling, and carpentry in one quote is often more cost-effective than hiring each trade separately. However, a sole trader may not cover all disciplines, so always clarify scope upfront.

Structural condition matters. If the existing subfloor is damaged, there is black mould behind old tiles, or the ceiling below needs replastering after a leak, these remediation costs appear once the room is stripped — not before. Allow a contingency of at least 10–15% for unforeseen work.

UK Average Cost Breakdown

DIY vs Tradesman — Is It Worth It?

A full bathroom refit is one of the more complex home improvement projects and is not well suited to complete DIY unless you have verifiable plumbing, tiling, and basic carpentry skills. That said, a hybrid approach — where you handle the strip-out, painting, and finishing, while a tradesman does the plumbing and electrical work — is a practical middle ground that can save £800–£3,000 in labour without compromising safety or building compliance.

Certain tasks are legally restricted. Any electrical work in a bathroom’s ‘zones’ (defined by the distance from water sources) must comply with Part P of the Building Regulations, which means either using a registered electrician or submitting a building notice to your local authority. Similarly, while plumbing is not legally restricted in the same way, poor DIY plumbing that causes water damage can invalidate home insurance claims and create expensive remediation work later.

Where DIY adds genuine value: demolition and strip-out, painting, fitting accessories such as mirrors and toilet roll holders, sealing and caulking, and simple fixture replacements in an existing bathroom. If you want to tackle individual tasks such as replacing taps, our guide to replacing bathroom taps covers the process in full. For shower-specific issues, see how to fix a leaking shower tray before any refit work begins.

The strongest case for a professional is when the layout is changing, the property is old and may have lead or iron pipework, or the scope includes a wet room (which requires specialist tanking and waterproofing). Getting this wrong costs far more to put right than the original labour saving.

Regional Price Variations

Labour rates for bathroom fitters and associated trades are noticeably higher in London and the South East than in the rest of the UK. A bathroom installation that costs £6,000–£8,000 all-in across the Midlands, North of England, or Scotland may cost £9,000–£13,000 for the same specification in London — primarily because day rates for plumbers, tilers, and electricians are higher in the capital. According to Checkatrade’s cost data, bathroom fitters in London can charge 30–50% more per day than the national average. This gap is less pronounced for materials, which tend to be priced similarly across the UK from national suppliers, though delivery charges to remote areas can add cost. If you are near a regional boundary, it is always worth obtaining quotes from tradespeople based slightly outside a city centre, as their travel time may be offset by a meaningfully lower day rate.

How to Get the Best Price

• Get at least three written quotes — verbal estimates are not binding. Ask each contractor to quote for the same specification so you can compare like for like. A quote that is significantly lower than the others is worth scrutinising carefully.
• Time your project carefully — bathroom fitters are typically busiest in spring and autumn. Booking in January or August, when demand is lower, can sometimes unlock a better rate or faster availability.
• Supply your own fixtures — many tradespeople apply a mark-up to materials they source. Buying the suite, tiles, and accessories yourself (from trade suppliers or reputable retailers) and asking the tradesman to fit only can reduce overall costs, though agree this arrangement in advance.
• Do the strip-out yourself — removing the old suite, tiles, and flooring is hard work but requires no specialist skills. Saving one to two days of labour by doing this yourself can reduce the quote by £300–£600.
• Keep the layout the same — every metre a waste pipe moves adds cost and time. Retaining the existing positions of the toilet, basin, and bath or shower eliminates the most expensive element of a refit.

What a Good Quote Should Include

• Full itemised breakdown — labour and materials listed separately, with quantities and unit costs where applicable. A single lump-sum figure makes it impossible to identify where cost lies or to make informed comparisons.
• Confirmation of who carries out the work — whether it is the quoted tradesperson directly or a subcontractor, and proof of relevant qualifications (Gas Safe registration if applicable, NICEIC or NAPIT registration for any electrical work).
• Payment schedule tied to milestones — not payment in full upfront. A reasonable structure is a deposit on commencement, a staged payment at first fix, and the balance on satisfactory completion.
• Waste disposal confirmation — the quote should state clearly who is responsible for removing and disposing of the old suite and debris, and how (skip, man-with-van, or trade waste collection).
• A written guarantee or warranty period — covering both labour and any manufacturer warranties on fixtures and fittings, with clarity on what is excluded (for example, normal sealant degradation over time).

Hidden Costs to Watch For

• Subfloor damage — old bathrooms frequently have softened or rotten floorboards or chipboard beneath the existing flooring, caused by years of minor water ingress. This is often only discovered during strip-out and can add £200–£800 to the project for new boarding and joists.
• Concealed mould and damp — once tiles and panels come off, significant black mould on walls or behind bath panels may require specialist treatment, additional waterproofing membranes, or even replastering. Budget for this possibility in older properties.
• Waste pipe gradients — if the floor void is shallow or the new layout requires a long waste run, achieving the correct gradient to prevent blockages can require lifting floor sections in adjacent rooms or significant additional pipe work, adding cost beyond the bathroom itself.
• Boiler and water pressure compatibility — a new shower or bath filler may expose existing low water pressure issues that were less obvious before. Fitting a pump or upgrading pipework to achieve adequate flow can add £400–£1,200. See our guide on how to fix low water pressure to understand the options.