Building a solid foundation for a padel court is straightforward for most contractors — but there are a few details worth getting right from the start. The groundwork determines not just the structural safety of the steel frame, but also how well your padel tennis flooring performs over time. Get it wrong, and even the best artificial turf won’t play the way it should.
The good news: this is not a skyscraper. The highest load-bearing demands come only at the perimeter, where the steel structure is anchored into the ground. The central playing area — 20 x 10 m — carries a load roughly comparable to a terrace. That matters when budgeting, because the whole slab doesn’t need to be engineered to the same spec.
For outdoor padel courts, local ground conditions play a bigger role than many clients expect. Frost depth, soil composition, typical rainfall — all of these affect which foundation type makes sense. Equally important: work with a local contractor whose systems and materials are already adapted to your region. A solution imported from another country rarely saves money once you factor in logistics and adaptation.
The foundation needs to meet four core specifications:
- Measurements and anchor points — supplied with our offer.
- Reinforced concrete strip foundation along the perimeter for structural anchoring. Strip width: approx. 40–50 cm / Depth: 50–80 cm*
- Playing area drainage — either water-permeable surface or a slope of around 0.7%
- Surface quality — slightly rough is fine, but no cracks or uneven spots. Irregular ball bounce is the first thing players notice, and they won’t forget it.
(*) In cold countries strip foundations must be frost-free. If it comes to frost, the water expands. It has so much power that it can lift the foundation at points. This will damage the foundation itself, allowing water to penetrate. This water in the foundation now causes the damage by bursting from the inside. The damage progresses more and more, if the foundation has not been laid correctly.
For a foundation to be frost-free, it must be laid out at a depth where frost can no longer be expected. As an example: In Germany this depth is on average between 0.80 and 1.50 m. How deep it finally freezes depends on the local conditions. In a little sunny alpine valley it freezes faster than in the mild west of Germany under the influence of the Atlantic climate. For most regions, a depth of 80 cm is sufficient to make the foundation frost-free.
Under the foundation a drainage layer
Nevertheless, another precautionary measure is usually taken. So under the actual foundation still a drainage or drying layer is applied. This consists of gravel (usually 16/32 grain), so that water can flow better and when freezes without causing damage.
In warm countries with very mild winters the most cost-efficient option is the single slab with slope. Also described in the following post. (see HERE)
The Surface Layer and Why Drainage Matters
Whatever goes under your padel tennis flooring needs to handle rainwater properly. The artificial turf is not glued down — it sits freely across the full 200 m² area, weighted by approximately 3 tonnes of silica sand spread evenly across the court. That means surface water needs somewhere to go, quickly and reliably.
There are two standard binder options: bitumen (asphalt) or concrete. Each has a water-permeable version worth knowing about:
Tarmac with drainage features
(also called “water-permeable asphalt”)
Used in sports construction as a drainage sub-layer. Water passes straight through to the layers below. The surface is rolled, giving a consistent, even finish.
- Asphalt top coat: approx. 5–10 cm
- Grain mix: approx. 2–16 mm
Drain Concrete
(also called “water-permeable concrete”)
Manufactured with a minimum 15% void content, so water passes through rather than pooling. One thing to check before installation: any protruding stones on the surface should be knocked flat before the turf goes down. It’s a small step that protects the flooring from below.
- Cover layer: approx. 14–16 cm
- Grain mix: approx. 6–8 mm (finer grain = smoother surface)
If NO water-permeable surface can be created
If a water-permeable surface isn’t possible
Strip foundation with concrete slab When full drainage isn’t achievable, a concrete slab with a slope of 0.7–1.0% along the 11 m side handles rainwater runoff. The slab should be reinforced with wire mesh (20 x 20 x 5 mm) and include expansion joints every 2 x 2 metres.To reinforce the bottom plate is a wire mesh of 20 x 20 x 5 mm.
Always cast the strip foundation and base plate separately
The question of whether both parts could be concreted at the same time seems quite plausible. Unfortunately, both parts should be concreted independently. First the strip foundations and then the bottom slab. In addition, the slab can only be concreted when the concrete of the strip foundations has cured according to the regulations.
The problem is that the slab is also very heavy. If the strip foundation and slab were to be concreted at the same time, the likelihood would be high that the concrete of the sñab would literally push or push apart the concrete of the strip foundation. That in turn would significantly degrade the structural strength.
Single Concrete Slab (20 cm thickness)
This approach suits warmer climates with mild winters. It’s simpler and often cheaper — but because the structural load concentrates at the perimeter anchors, the strip foundation method is generally the safer long-term choice.
(*) The information is given without guarantee and merely serves as guidelines to simplify the conversation with the contractor. Let your contractor advise you so that he can work out the best and most favorable solution for you based on local conditions and regulations. Gardeners often make strip foundations for their garden sheds, and could also help.
For further questions please do not hesitate to contact us.
FAQ
A padel court requires a reinforced concrete strip foundation along the perimeter, where the steel structure is anchored. The strip should be approximately 40–50 cm wide and 50–80 cm deep. The central playing area (20 x 10 m) carries a lighter load, comparable to a terrace. In cold climates, the strip foundation must reach below the local frost line — in Germany, for example, between 80 and 150 cm depth depending on the region.
Padel tennis flooring — the artificial turf and silica sand layer — is laid directly onto the prepared base surface. That base must be either water-permeable (using drain asphalt or drain concrete) or sloped at around 0.7% to allow rainwater runoff. The surface should be firm, slightly rough, and free of cracks or bumps, as any irregularity affects ball bounce. Approximately 3 tonnes of silica sand are spread across the 200 m² playing area; the turf is not glued down.
Foundation costs vary significantly by region, soil conditions, and chosen construction method. Using a local contractor with established systems and materials is generally the most cost-efficient approach. The strip foundation method, while more involved than a single slab, is usually preferred for its superior structural performance at the anchor points — which carry the highest load in a padel court structure.
