The cost of a bathroom renovation depends mainly on the size of the room, the fittings and the condition of the existing pipes, and can only be given realistically as a range.
Hardly any question concerns people more before a bathroom conversion than the price. That is understandable, because the bathroom is one of the most expensive rooms in the whole house. At the same time, the figures circulating online vary widely and confuse more than they help. This guide puts the most important cost factors into context and shows you what to expect for different bathroom sizes. This gives you a realistic sense of the costs before you request your first quote, and you will see where it makes sense to save money.
What determines the cost of a bathroom renovation
Anyone looking for a one-size-fits-all answer to the question of price will inevitably be disappointed. A bathroom renovation is always an individual project, and the final total results from the interplay of several factors. Reliable figures are therefore almost always ranges rather than fixed amounts.
The first big lever is the size of the room. The more surface area that has to be tiled, plumbed and fitted out, the higher the cost of materials and labour. The chosen standard of fittings has almost as strong an effect. There is a world of difference between a solid standard solution and high-end branded fixtures with a special look, even though the function is the same in the end.
One often underestimated point is the structural condition behind the tiles. If the water pipes and drains are getting on in years or the electrical wiring needs replacing, the work increases noticeably. Changing the layout, for example moving the shower to a different wall, also drives up costs because connections have to be relocated. Finally, the region plays a role, as tradespeople's wages vary considerably depending on location. If you are converting your bathroom to suit later life, you should plan additional features such as sturdy grab bars or a safe way into the shower from the start.
Bathroom renovation costs by bathroom size
Most people look for guide figures for their specific bathroom size, for example 4, 5, 6 or 8 square metres. As a rough rule of thumb, the larger the bathroom, the higher the total, because more surface area has to be worked on. However, this logic falls short as soon as you take a closer look.
Costs per square metre are a popular reference. They seem practical but are often misleading. The reason lies in the fixed costs. A toilet, a vanity unit and a shower cost almost as much in a small 4-square-metre bathroom as in a large one, because the sanitary fixtures and their connections are needed regardless of the floor area. If you spread these fixed items over just a few square metres, the price per square metre in a small bathroom appears higher than in a large one. A small bathroom is therefore not automatically cheap.
In a typical family bathroom of around 6 square metres, the costs are spread across all trades, from plumbing and tiling to electrics. At 8 square metres, the main additions are more floor space and often an extra bathtub or a larger washbasin area. A specific quote that takes your room, your wishes and the condition of the building fabric into account is therefore more meaningful than any price per square metre. For an initial assessment, it helps to break the project down into individual cost blocks.
The biggest cost items in a bathroom conversion
A bathroom renovation involves several trades working one after the other or in parallel. If you know their shares, you will quickly understand where most of the money goes and where saving really pays off. The following overview gives a rough idea of how the total costs are distributed. The actual shares vary considerably from project to project.
| Item | Approximate share of total costs |
|---|---|
| Plumbing (pipes, connections, installation) | high, often the largest block |
| Sanitary fixtures (shower, toilet, vanity unit, bathtub) | medium to high |
| Tiles and floor work | medium |
| Electrics, lighting and ventilation | low to medium |
| Painting, drywall and other work | low |
In most cases, the biggest item is the plumbing, because skilled tradespeople with a high hourly rate work here and laying pipes takes a lot of time. The sanitary fixtures themselves can also add up considerably, depending on your choice. A floor-level shower, for example, is more expensive to buy and install than a simple shower tray, because the floor has to be prepared and properly sealed.
Tiles are in the middle range, with materials ranging from plain standard tiles to exclusive natural stone. If you want to reduce the surface area and therefore the costs, you can do without floor-to-ceiling tiling and combine tiles in the splash zone with easy-care wall panels above. Electrical work and painting complete the project and are usually less expensive by comparison.
Complete renovation or partial refurbishment
Not every bathroom has to be stripped back to the shell. Before you start planning, it is worth asking yourself honestly whether a complete renovation is necessary or whether a targeted partial refurbishment will do. This decision affects the costs more than almost any other factor.
A complete renovation makes sense if the pipes are outdated, there is moisture in the walls or the layout no longer works. In this case, the greater effort pays off in the long run, because you will have peace of mind for many years and can adapt the bathroom to your current needs. Especially when converting a bathroom for later life, the complete solution is often the better choice, because door widths, manoeuvring space and a safe way into the shower can only be implemented properly with more extensive work.
A partial refurbishment, on the other hand, is sufficient if the building fabric is sound and it is mainly the look or individual fixtures that bother you. Simply replacing the vanity unit and taps, a fresh coat of paint or refreshing old tiles can visibly change the room without requiring the budget of a full renovation. If you want to refresh your bathroom without completely retiling it, there are now easy-care panels that are fitted directly over the old surface. This produces a neat result with a manageable amount of work. Our guide to planning a bathroom renovation shows how to structure a larger project sensibly.
What an age-friendly bathroom conversion costs in addition
If the bathroom is to become not only more attractive but also safer and more comfortable in later life, a few items are added that are not part of a simple renovation. This investment pays off in independence and safety.
Typical elements include a shower area with a low entry that makes access easier. Sturdy grab bars at the shower, bathtub and toilet provide support and can offer more safety in everyday life. To make sure they hold securely, they should be fitted by a specialist company that checks the anchoring in load-bearing masonry. A toilet at an adjusted height and a vanity unit with knee space underneath make everyday use noticeably easier. If you would like to continue taking baths, a bathtub with door or a seated solution lets you get in and out comfortably without a high obstacle. For many households, suitable sitting bathtubs are a comfortable alternative to a conventional bathtub.
The German standard DIN 18040-2, which describes manoeuvring spaces and dimensions for accessible building design, serves as a guide for spatial planning. It is not mandatory for a private renovation, but it provides useful reference values, for example for sufficient space in front of the sanitary fixtures. If you want to make getting into the shower more comfortable, choose shower cabins with a low entry instead of a high shower tray. Smaller measures such as non-slip mats or a shower stool can also contribute to safety without breaking the budget. A range of suitable bathroom safety accessories can often be added later. Many of these steps are described in detail in our guide to age-friendly bathroom conversion.
Avoiding cost traps in a bathroom renovation
Many unpleasant surprises are caused not by expensive wishes but by hidden problems that only become visible when the walls are opened up. If you know about them, you can factor them in or have them checked in good time.
The most common stumbling block is outdated or leaking pipes. If moisture appears behind old tiles, pipes have to be replaced and walls dried out, which puts pressure on the schedule and the budget. Mould behind pre-wall installations or in corners is also a typical find in older bathrooms. Another trap is an electrical installation that no longer meets current standards and has to be brought up to date as part of the renovation.
To keep your dream bathroom from becoming a money pit, forward-looking planning helps. The following checklist summarises the most important points to help you avoid unpleasant extra charges.
- Have the condition of the pipes and waterproofing assessed by an expert before work begins.
- Plan a buffer for the unexpected, especially in older buildings.
- Obtain several quotes and compare the services, not just the final total.
- Ask for every item to be broken down in writing in a clear and transparent way.
- If you rent your home, agree in advance with your landlord who will pay for which measure.
How to plan your bathroom renovation on a budget
Good planning is the most effective lever for keeping costs under control. It starts long before the first hammer blow with an honest assessment of the current situation and a clear list of priorities. Consider what is absolutely necessary and what you can do without if the budget is tight.
If you are good with your hands, you can save money by doing some of the work yourself. Removing old tiles, demolition work or painting at the end can often be done yourself, while plumbing and electrics belong in professional hands. Be realistic about what you can do yourself, because poorly executed preparatory work ends up costing more than it saves.
Another money-saving tip is timing. If you are flexible and do not renovate in peak season, you may get better terms. Also compare quotes thoroughly and check whether expensive special requests really justify the added value. Depending on the scope, an average bathroom renovation usually takes a few weeks. Allow for this time and find out whether a substitute bathroom will be available during this phase. With a realistic sequence and clear agreements, you can keep an eye on both the schedule and the budget.
Frequently asked questions about bathroom renovation costs
Prices per square metre are of limited value. Because fixed items such as sanitary fixtures and connections are needed regardless of the floor area, the price per square metre is usually higher in a small bathroom than in a large one. Only a specific quote for your room is reliable.
A bathroom of 6 square metres is a common size in which all trades come together, from plumbing and tiling to electrics. The total depends heavily on the standard of fittings and the condition of the building fabric. Obtain several quotes to get a reliable figure.
The most common additional costs are caused by outdated or leaking pipes, moisture and mould behind the tiles and an electrical installation that no longer meets current standards. These problems often only become visible when the walls are opened up. Checking the condition in advance and building in a budget buffer help to cushion surprises.
You can save by doing the demolition and painting yourself, by reducing the tiled area and by doing without expensive special requests. Comparing several quotes also noticeably reduces the financial burden, without compromising on safety or quality.
Which solution is right for your bathroom and your budget depends on your personal situation. We will be happy to help you choose suitable products for a safe and comfortable bathroom.
