Renovating a bathroom in London is rarely a case of choosing a new suite and paying a fitter to install it. The final cost is shaped by what sits behind the finishes, how much of the layout is changing, and the level of detail you want to achieve.
As a broad planning guide, a professionally managed bathroom renovation may cost around £7,000–£12,000 for a straightforward like-for-like refurbishment, £12,000–£20,000 for a well-specified mid-range project, and £20,000–£40,000 or more for a high-specification or bespoke bathroom. A tightly scoped refresh that retains the existing layout and services can sometimes fall below these ranges.
These figures are not quotations. Two rooms of exactly the same size can have very different budgets. A compact bathroom with a tiled walk-in shower, concealed brassware, natural stone and made-to-measure joinery may require considerably more work than a larger room with a simple layout and standard fittings.
At Smart Maintenance+, we look beyond the size of the room. We consider the existing plumbing and electrics, the condition of the walls and floor, access to the property, the products selected and how every visible detail will be finished. That is the only way to build a realistic quotation.
What does a complete bathroom renovation include?
A full renovation normally starts with protecting the route through the property before the existing bathroom is removed. Once the room is stripped out, the team can assess the surfaces and services that were previously hidden.
The work may include new plumbing and waste connections, electrical alterations, improved extraction, heating changes, repairs to walls or floors, waterproofing, plastering, tiling, decorating and the installation of all sanitaryware, furniture and brassware. Testing, snagging and a final clean should also be part of a properly managed project.
When comparing quotations, it is important to look at the full scope rather than the headline figure. A lower price may exclude waste removal, electrical work, wall and floor preparation, waterproofing or final decoration. Those items do not disappear; they usually return later as extras.
What affects the cost of a bathroom renovation?
1. The fittings and finishes you choose
Bathroom products vary enormously in price, but the purchase price is only part of the story. The way a product is installed can change the labour and preparation required.
A standard shower tray is usually straightforward to handle and fit. A level-access tiled shower needs carefully prepared falls, waterproofing and accurate setting-out. A close-coupled toilet is very different from a wall-hung WC with a concealed frame and flush plate. Concealed shower controls, multiple outlets, smart fittings and illuminated niches all require additional planning before the walls are closed.
We also find that the cheapest product is not always the cheapest option overall. Poor tolerances, unclear instructions or badly made components can take longer to fit neatly and may be harder to maintain in future.
2. Whether you are changing the layout
Keeping the bath, basin, WC and shower close to their existing positions can help control the budget. Moving them can involve new supply pipes, waste routes, soil connections, electrical points and boxing.
Drainage is often the deciding factor. Waste pipes need sufficient fall, and in London properties the available route may be restricted by joists, masonry walls, neighbouring flats or shared services. A layout that looks simple on paper may require significant work once the building is properly assessed.
This does not mean you should automatically keep an awkward layout. A well-considered change can transform how the room feels and functions. It simply needs to be tested technically before products are ordered and the budget is fixed.
3. What is hidden behind the old bathroom
Bathrooms often look sound until the tiles and fittings are removed. Previous leaks, damaged timber, loose backgrounds, corroded pipework, uneven floors or inadequate waterproofing can all affect the amount of preparation needed.
A detailed survey reduces uncertainty, but no contractor can see through every tiled wall or floor before strip-out. A clear quotation should explain what has been allowed for and how genuinely unforeseen work will be recorded and approved.
This is one of the reasons we never recommend cutting the budget on preparation. The parts you cannot see—stable surfaces, sound pipework, correct falls and effective waterproofing—are what allow the finished bathroom to perform properly for years.
4. Plumbing, heating, lighting and ventilation
A new bathroom must work with the services available in the property. A large rainfall shower, multiple outlets or smart WC may need more than a simple connection to the existing pipes. Water pressure, hot-water capacity, pipe sizes and waste routes should all be checked before the design is finalised.
The same applies to lighting and heating. Illuminated cabinets, electric underfloor heating, niche lighting, new controls and improved extraction can require new cabling and careful coordination with tiling and joinery.
These decisions are best made early. Adding an electrical feed or moving a valve after walls have been plastered and waterproofed creates unnecessary disruption and cost.
5. Tiles, stone and specialist details
Tile choice can make a significant difference to both the look of the room and the installation cost. Mosaics, patterned layouts, natural stone, mitred corners and recessed niches all take time and skill to set out well.
Large-format tiles can create a calm, luxurious finish with fewer grout lines, but they do not automatically reduce labour. They need very flat backgrounds, specialist cutting and careful handling. Heavy slabs or natural stone may also affect access, lifting and floor preparation.
Bespoke elements such as made-to-measure mirror cabinets, vanity units, stone worktops and concealed access panels add character and make better use of the room. They also need accurate early dimensions because they affect plumbing positions, electrical feeds and tile lines.
6. Access and working restrictions in London
The practicalities of reaching and working in the property can have a real effect on cost, particularly in flats and mansion blocks.
Restricted working hours, parking and loading limits, lift protection, stair-only access, timed deliveries and long routes for removing waste all reduce productive working time. Building management may also require specific protection to communal areas or prior approval of the work.
We establish these details before finalising a quotation. It is much better to plan for them from the beginning than to discover them after the project has started.
What do two recent Smart Maintenance+ projects tell us about bathroom costs?
The difference becomes much clearer when we compare two bathrooms Smart Maintenance+ completed within the last six months. They were very different briefs, but together they show why room size alone is a poor way to estimate a renovation.
Project example 1: a cost-conscious rental-ready bathroom
One recent project in Surrey was a straightforward refurbishment of a bathroom of approximately 6 m². The client wanted a clean, durable and low-maintenance finish before renting out the property, without spending unnecessarily on a full high-specification redesign.
We kept the sanitaryware broadly in the same positions, avoided major plumbing changes and did not alter the electrical circuits. Instead of using more expensive tiles throughout the shower area, we replaced the existing tiles with full-height bathroom wall panels. We also installed new sanitaryware, laid vinyl flooring and redecorated the ceiling, window and other woodwork.
The materials were approximately £2,500 and labour approximately £3,000, giving a project cost of around £5,500 before VAT. The important point is not simply that this bathroom cost less; it is why. Retaining the layout, limiting service alterations and choosing practical finishes kept both materials and labour under control.
Project example 2: a high-specification bathroom in a top-floor flat
At the other end of the scale, another recent bathroom was approximately 20 m² and involved an extensive refurbishment. The specification included a Jacuzzi, natural stone, mosaic and large-format tiles, upgraded electrical circuits, new lighting and LED strips. Specialist tilers were used, and niches and external corners required 45-degree mitred cuts to the stone and tiles.
The project cost was approximately £45,000. Materials alone were around £12,000–£15,000, while labour was around £20,000. Some professional design and measurement services were arranged and paid for directly by the client. The bathroom took around six weeks to complete.
Access added another layer of cost and planning. The bathroom was in a top-floor flat where materials could not simply be unloaded outside the property. Parking had to be arranged and paid for, and additional labour was needed to move materials through the building. The block management also required a higher level of insurance cover because of the value of the properties below.
These two projects are a useful reminder that a bathroom budget is driven by much more than square metres. Specification, service changes, specialist workmanship, access, building-management requirements and the level of finish can move two bathrooms into completely different cost brackets.
Where should you invest – and where can you save?
If you need to control the budget, start by protecting the elements that will be difficult and expensive to revisit: plumbing, drainage, electrics, floor and wall preparation, waterproofing, extraction and access to concealed components.
Savings are often easier to make in the visible specification. You might retain the existing layout, use fewer tile formats, choose standard-sized sanitaryware or simplify bespoke features. A carefully selected mid-range tap or basin can still look beautiful when it is installed accurately within a well-proportioned design.
We would always prefer to simplify a decorative detail than compromise the work behind it. A bathroom first has to manage water, ventilation, movement and daily use. The finishes should sit on top of that sound foundation.
Why a site survey matters
Photographs and room measurements are useful for an initial conversation, but they are not enough for a reliable estimation. We need to understand the existing room, the route of the services, access to the property and the specification you have in mind.
During the survey, we discuss how you use the bathroom, what you would like to change and which features matter most to you. We can then identify the technical questions that need to be resolved and help shape the design around a realistic budget.
A detailed quotation should clearly set out what is included, what is excluded, any allowances for products or uncertain items, VAT and the process for agreeing variations. This gives you a meaningful basis for comparing contractors.