Generally valid recommendations for planning a pile foundation cannot be given because the costs ultimately depend on the construction project. Therefore, take the cost examples as a guide and obtain an individual offer for your construction project from your service provider.
Composition of the construction costs for the pile foundation
The construction costs are made up of various individual items, which ultimately result in the sum of the total costs. Individual items may include:
- Construction report on soil conditions
- Inspection of the beam grating by the structural engineer
- Making a concrete beam grating
- Reinforcement of the base plate
- Arrival and departure of the machines
- Flat fee for setting up the construction site
- Departing the excavation
- Straightening the construction site with sand
Construction report on soil conditions
Preparing a building report on the condition of the soil is recommended because it allows you to determine the need for a pile foundation, but also the strength of the piles and the material. You pay around EUR 1,000 net for the soil report.
Inspection of the beam grating by the structural engineer
A beam grid can be concreted onto the foundation to distribute the load. To determine whether the additional load caused by the pile foundation is acceptable, you should hire a structural engineer. The costs are around 600 EUR net.
Making a concrete beam grating
If the beam grid is not available or the load-bearing capacity was found by the structural engineer to be insufficient during testing, production is necessary. Concrete is used for this. You pay around EUR 4,000 net for the production of such a beam grating.
Reinforcement of the base plate
Reinforcement of the floor slab may be necessary if a pile foundation is to be implemented for the single-family home. The costs are around EUR 3,000 net.
Arrival and departure of the machines
Special construction machinery is required for the pile foundation, which must be transported to the construction site and picked up again. The prices for this service are around 600 EUR net.
Flat fee for setting up the construction site
The construction site must be prepared for the pile foundation. This includes, among other things, excavation so that the piles can be driven in. You pay a flat rate of around EUR 1000 net to set up the construction site.
Departing the excavation
After the construction work has been completed, there remains an excavation that usually has to be removed. This service also costs around EUR 1,000 net.
Straightening the construction site with sand
Straightening the building site is important so that further work can follow and you later have the opportunity to create the garden around the single-family home. The prices for straightening using sand are between 400 EUR and 600 EUR.
Calculation of the individual piles
In addition to this basic and preparatory work, the piles are invoiced individually. Different piles can be used.
Modern pile foundation with in-situ concrete
Whether the modern pile foundation can be used with in-situ concrete depends on the nature of the soil. However, as a rule there are no problems. The implementation is carried out by deep excavation. The concrete is poured into this excavation. It is therefore brought to the construction site in a liquid state and processed there. Formwork is used in which the in-situ concrete hardens immediately. Processing is easy on site and different depths of the pile foundation can be achieved.
Floating or standing pile foundation
Whether the floating or standing pile foundation is used in your construction project depends on the soil conditions. With floating pile foundations, the load is transferred through friction on the lateral surface of the pile. With a standing pile foundation, however, the load is shifted to a deeper layer of earth.
In terms of costs, the two options don't differ much. The preparation and follow-up work already described is used for both standing and floating pile foundations.
Auger bored piles
Auger piles are quite inexpensive compared to the other options. You pay around EUR 800 net for each individual post.
Rawed in-situ concrete piles
These posts are priced per running meter. This costs around EUR 100 net if the diameter of the piles is 40 centimeters. In addition, it is necessary to cut the height of the in-situ concrete piles. A flat rate of 100 EUR net per piece will be charged for this step.
Alternative pricing option
The cost of inserting the piles is usually charged per meter. The prices are between 25 and 30 EUR. The material and design are not included in this price. This means that you have to pay for the craftsman's hours as well as the materials. Reinforced concrete can be purchased quite inexpensively, so you can save on construction costs if you choose this material.
Possible total cost for the pile foundation
The total costs for the pile foundation are in any case in the five-figure range. You will pay around EUR 12,000 net for work that is necessary as part of the preparation and follow-up. The net price does not include VAT. Added to this are the costs for the piles, which are billed per meter. If material costs and the costs for working hours are taken into account, the running meter for a cased in-situ concrete pile costs 100 EUR. The length of the piles can be several meters. A single-family home may require around 20 piles. This results in the following total costs:
- 20 poles, each five meters long=10,000 EUR
- Cutting for each post=2,000 EUR
- Calculation of additional costs=12,000 EUR
- VAT 19%=4,560 EUR
- The total amount of the example calculation is 28,560 EUR.
So the pile foundation is a fairly high cost factor, but it makes it possible to build a single-family home on a rather unsuitable surface. The individual total costs for your construction project may differ from this sample calculation as they are calculated very individually. In principle, however, you have to expect a higher five-figure sum for a single-family home.
