What is the cost of waterproofing the bathroom

Checklist: costs of a bathroom renovation - total and per m²

Is your bathroom getting old and you are planning a renovation? The first thing that arises is the question of material costs. These depend on the planned scope of the work and can therefore be controlled to a certain extent. In our checklist we have listed the most common cost items and also offer you tips on how to save costs.

Before you start with the bathroom renovation, you need to draw up an exact cost plan. This includes various items, such as the flooring, the renewal of the wall tiles and the bathtub. The individual costs depend on both the size of the room and the choice of materials. Allow for breakage in the tiles and choose the bathtub, toilet and washbasin based on the design and the prices offered. In any case, you should create a precise overview of costs when planning. Our checklist and tips will help you with this, so that you retain full cost control.


Item of bathroom renovation in the overview

The checklist shows you the costs for the individual renovation work. Take a 20 square meter bathroom as an example. In the calculation, the bathroom has a size of 5 m x 4 m x 2.5 m.

a) Renew the floor covering

In the bathroom, tiles are often chosen as the flooring. The costs depend primarily on the number of square meters and the design of the tiles. Inexpensive versions are already available for less than 10 euros per m², high-quality versions can cost a good 70 euros per m². Other costs are the tile adhesive / mortar and the silicone. In general, you should expect around 12 euros per 25 kilos of tile adhesive and 10 euros per bottle of silicone.

Tip: Since it quickly becomes slippery in the bathroom, slip-resistant tiles are particularly suitable. They increase security and are therefore a worthwhile investment. Another important point is the abrasion resistance of the material. Since the room is very busy, you should ensure that the tiles are of sufficient quality.

Example calculation:

In our example, the area of ​​the bathroom is 5 mx 4 m = 20 m². If you calculate with a price per square meter of 40 euros, then the material costs for the floor tiles come to 800 euros. There is also around 50 euros for additional materials for attachment.

Total costs for laying the floor tiles: 850 euros.

The prerequisite is that the substructure does not have to be renewed. Otherwise, the expenses increase again by the prices for the repair or replacement.

b) Put tiles on the walls

Wall tiles are particularly suitable in the bathroom because they are protected against splashing water. Inexpensive designs are available for around 5 to 10 euros per square meter. If you prefer a special design, the material costs are 50 or more euros. There are almost no upper limits. A special highlight are glass mosaic stones that you can integrate into the design. The prices here are around 35 euros per square meter for a plain white design. In addition to the material costs for the tiles, there are also expenses for the tile adhesive or mortar and the drawing of the joints. A bag of tile adhesive (25 kilograms) costs around 12 euros. Silicone is available for around 10 euros per bottle.

Example calculation:

The circumference of the bathroom is: 5 m + 5 m + 4 m + 4 m = 18 m

From this value you can now determine the wall area. Multiply the perimeter by the height of the room:

18 m * 2.5 m = 45 m²

At a price of 20 euros per square meter, the material costs for the tiles are 900 euros. Another 50 euros are required for auxiliary materials.

Total costs for the bathroom: 950 euros

c) Integrate underfloor heating

When it comes to underfloor heating, you can choose between electric underfloor heating and warm water underfloor heating. The cost depends on the type of heating:

  • electric underfloor heating: 30 to 70 euros per square meter
  • Warm water heating: 40 euros per square meter

When calculating the prices, any additional costs for renovating the substructure must also be taken into account in this case. In any case, the tiles will be renewed, the costs for this can be found in point a).

Tip: Underfloor heating ensures greater comfort and, in the case of electric heating, can also be used when the main heating has already been switched off or not yet switched on. When choosing models, you need to pay attention to their effectiveness, since it will depend on the subsequent heating costs. Make sure that you have good insulation in order to also save operating costs.

Example calculation:

If you install electric underfloor heating, you have to reckon with investments of around 40 euros per square meter. The 20 m² bathroom thus leads to an investment of around 800 euros. In addition, there may be expenses for insulation. The material costs depend on the effort required. It is important to create a level subsurface, which means that the substructure may have to be renewed.

Total underfloor heating costs: 800 euros

d) Attach wall heating element

Flat radiators are often used in the bathroom. They also serve as towel rails. The material costs depend heavily on the desired design. While inexpensive radiators are available for around 70 euros, designer models can cost 200 euros and more. Simple thermostats cost around 7 euros. If you choose programmable variants, these are available for around 50 euros.

Attention: The prices do not include expenses for laying new pipes. If this is necessary, then calculate in material costs of around 15 euros per meter of pipe, plus around 2 to 3 euros in expenses for fittings.

Tip: Adjust the size of the radiator to the size of the room. This saves you material costs and allows you to heat effectively later.

Example calculation:

A simple heating element is available for around 70 euros, plus around 7 euros for the thermostat. You will need around 20 euros to seal the pipes and for auxiliary materials.

Overview of expenses:

Radiator: 70 euros
Thermostat: 7 euros
Auxiliary materials: 20 euros

Total costs for the wall radiator: 97 euros

e) wash basin

Sinks are available in many different versions. Homeowners often want to combine bathroom renovation with the installation of a particularly beautiful model. Modern washbasins, for example from Villeroy & Boch, are already available for around 140 euros, there are no upper limits for designer versions. If you prefer a simple model, you will find it in the hardware store for around 40 euros. A simple mixer tap for the basin costs around 14 euros, a more luxurious version is available for 50 euros. The drain must be calculated at around 20 euros.

Tip: With the taps, you should pay attention to the water flow. Often, particularly economical models are offered that allow a sufficient amount of water to pass through, but are still economical. In many cases you can also add attachments to existing taps and thus save water costs.

Example calculation:

If you choose an inexpensive model, you will incur the following expenses:

Wash basin: 40 euros
Mixer tap: 14 euros
Drain: 20 euros

Total cost of the sink 74 euros

f) toilets

The prices for the toilet also depend heavily on the model selected and averages between 50 and 150 euros. For the toilet box and various auxiliary materials, you have to reckon with expenses of around 30 euros. In this case you will receive a classic plastic box. If, on the other hand, you decide on a flush-mounted model, the investment costs are around 250 euros, depending on the size, the manufacturer and the effort.

Example calculation:

Toilet 50 euros
Toilet box and auxiliary materials 30 euros

total cost 80 euro

g) shower / bathtub

The prices for the renewal of the shower or the bathtub depend primarily on the structural features. Often times you have to change the location of the wash basins when renovating the bathroom because the new elements have a different size or you are restructuring the bathroom. There are also particularly luxurious designs, an integrated whirlpool or a barrier-free shower route. This means that only a rough guideline can be given for the prices. In our calculation, we therefore name the cheapest prices, everything is open, especially for bathtubs and shower stalls. Note that the cost of replacing the tiles in the shower and / or bathtub area and the fittings are added to the material costs.

Example calculation:

If you want to renew the shower or bathtub, then the cost depends heavily on the level of comfort you want. When exchanging, you will incur the following cost items (medium price segment):

  • Bathtub (price from 100, - €): 400 euros
  • Bathtub fittings (price from 65, - €): 120 euros
  • Shower tray (price from € 100): € 200
  • Shower cubicle (prices from € 150): € 400
  • Shower fittings (prices from € 50) € 150
  • Renewal of wall tiles
  • installation

Total costs for bathtub and shower (medium price category): from approx. 1270 euros

h) Install fan

Fans are particularly popular in smaller bathrooms without adequate ventilation. The performance must be selected according to the frequency of use of the room and the volume of the room. Simple models cost around 20 euros, high-performance versions are available for around 50 euros. Also calculate around 5 euros for auxiliary materials.

Example calculation:

If a simple fan is installed in the room as a support, the following issues arise:

Fan: 20 euros
Auxiliary materials: 5 euros

Total cost for the fan: 25 euros.

i) screed

For liquid screed, you have to reckon with material costs of around 12 euros per m² if you do the work yourself. If you opt for dry screed, the price per square meter for the material is around 21 euros. In addition, there are expenses for the pouring and the glue. On average, the equalization charge costs around 0.25 euros per kilogram. The screed adhesive is available in a 1-kilogram bottle for 13 euros.

Example calculation:

If you calculate with a 20 square meter room, the following costs arise with dry screed:

Dry screed panels: 20 m² * 21 euros per square meter = 420 euros
Compensating fill (0.25 euros per kilogram) = 50 euros per centimeter of height
Glue (1 kilogram of 13 euros) = 13 euros

Total costs for the bathroom: 483 euros.


  • Floor tiles: 850 euros
  • Wall tiles: 950 euros
  • Underfloor heating: 800 euros
  • Wall radiator: 97 euros
  • Wash basin: 74 euros
  • Toilet: 80 euros
  • Shower / bathtub: 1200 euros
  • Fan: 25 euros
  • Screed: 483 euros

The following total costs result from these individual items: 4559 euros.

Tips for lowering your material expenses

If you preserve the locations of the shower, sink, and toilet, then the necessary expenses go down. You can usually get the installation pipes, which lowers the investment costs. Further savings can be made, among other things, by reusing individual elements, such as the bathtub. The prices for the material can also drop again with a large purchase quantity.

Tips for fast readers:

  • Prices depend on the desired level of comfort
  • calculate the following items:
    • Floor tiles
    • Wall tiles
    • Underfloor heating
    • Wall radiator
    • sink
    • Toilet
    • Shower / bathtub
    • Fan
    • Screed
  • Prices can increase due to additional work
  • cheaper if locations are retained
  • Buy replacement tiles
  • make sure that the surface is level
  • 20 m² bathroom: around 4559 euros in total costs