What are the requirements for a Kiwa ISA Sport certified padel court?

If you want to build a padel court in the Netherlands, sooner or later you will come across the term Kiwa ISA Sport. This quality mark is not just a stamp. It determines whether your court meets the official sports-technical standards and whether official matches may ever be played on it. But what exactly does that certification involve, and what requirements does it set for the various parts of a padel court?

In this article we answer the most frequently asked questions about the Kiwa ISA Sport requirements for padel courts. Whether you are a tennis club looking to convert, a commercial venue wanting to build courts, or a municipality considering a padel facility, here you will find the information you need to be well prepared.

What is Kiwa ISA Sport certification for padel courts?

Kiwa ISA Sport certification is an independent quality inspection for sports floors and sports infrastructure in the Netherlands. For padel courts this means that the sports-technical properties of the floor and the materials it is made of are tested against established standards. A certified padel court demonstrably meets the requirements that apply to professional and competition use.

In the Netherlands, Kiwa ISA Sport maintains the so-called sports products list. This list contains the sports floor products that have been approved for use at sports facilities. If you want your padel court to appear on that list, or want to check whether a product is already certified, Kiwa ISA Sport is the body you will deal with. For official matches, such as KNLTB competitions, inspection by a recognised body is mandatory. In the Netherlands, Kiwa ISA Sport is the designated party for that inspection.

The certification focuses specifically on the sports-technical properties of the floor: how does the ball bounce, how does the surface respond to load, and how does the material behave over time? These are the questions at the heart of the assessment.

Which parts of a padel court must be Kiwa ISA Sport approved?

The Kiwa ISA Sport inspection focuses primarily on the sports floor of the padel court, that is, the artificial turf and the associated infill material. All components that affect the sports-technical properties of the playing area are assessed. This includes the artificial turf mat itself, the type of fibre, the stitch density and the infill material used.

In practice, the following components are checked during an inspection:

• The artificial turf mat of the playing area and the out-of-court area
• The infill material (usually quartz sand with a specific grain size)
• The line markings: complete, white in colour, continuous and clearly contrasting with the playing area
• The flatness of the surface: no open seams, no creases, no contamination or damage
• The uniformity of the out-of-court area

The steel structure, the glass and the LED lighting fall outside the sports-technical inspection by Kiwa ISA Sport. Those components are assessed on the basis of other standards, such as structural safety calculations and fire safety regulations. But for the playing floor itself the rule is: without approved materials on the sports products list, no certification.

What are the technical requirements for the foundation of a padel court?

The foundation of a padel court must be stable, flat and durable. Kiwa ISA Sport prescribes that laboratory measurements are carried out on a flat, rigid concrete floor with a minimum thickness of 100 mm and a stiffness of 40 MPa, measured in accordance with EN 12504-2. The foundation must not affect the sports-technical properties of the floor. It forms the neutral base on which the artificial turf delivers its performance.

In practice, several foundation types are used for padel courts:

• Drainage concrete: a water-permeable type of concrete in which rainwater drains straight through the foundation into the ground. Widely used for outdoor courts, with an average lifespan of 25 to 40 years.
• Supersub: a foundation solution based on foam concrete, lightweight, self-levelling and shock-absorbing. Suitable for both new-build and conversion projects, and available in a water-permeable variant for outdoor use.
• ZOAB asphalt (open-graded asphalt concrete): a porous asphalt variant that lets water through and is a good option in certain situations.

Important: all foundation components used in the Netherlands must be approved by Kiwa ISA Sport. This applies to the artificial turf, the infill material and the sports floor as a whole. Anyone who works with uninspected materials risks the court not meeting the standards, with all the consequences that entails for permitting and official use. The exact foundation choice always depends on the soil conditions, the use and the location.

What are the requirements for the artificial turf of a certified padel court?

The artificial turf of a certified padel court must meet precisely defined sports-technical properties. After a wear simulation of 5,200 cycles, measurements are carried out under controlled conditions on flatness, ball bounce, fibre behaviour and infill distribution. The artificial turf is assessed on laboratory samples of at least 3.0 x 1.0 metres, conditioned at 23 degrees Celsius and 50% humidity.

The technical specifications the artificial turf must meet include:

• Number of stitches per surface area: at least 42,000 per m² for fibrillated and curled fibres, at least 52,000 per m² for straight fibres
• Fibre size and length: in accordance with the manufacturer’s declaration, with a product tolerance of plus or minus 10%
• Infill material: evenly distributed, filled to the top of the fibre, with a grain size that suits the chosen type of artificial turf
• Visual properties: no open seams, no creases, no damage, correct line markings

The colour of the playing area, the service boxes and the out-of-court area is declared by the manufacturer at inspection. There is no obligation to use a specific colour, but the line markings must always be white and clearly contrast with the playing area. The infill material generally has a grain size of 0 to 1 mm quartz sand, matched to the type of artificial turf used.

What happens if a padel court does not meet the Kiwa ISA Sport requirements?

If a padel court does not meet the Kiwa ISA Sport requirements, no certification can be issued. This has direct practical consequences: the court may not be used for official matches or KNLTB competitions. In addition, the lack of an inspection can cause problems with permitting or when accounting to a municipality or subsidy provider.

In practice there are two situations in which non-conformity occurs:

1. Materials are not on the sports products list: if the artificial turf or the infill material has not been approved by Kiwa ISA Sport, the court by definition does not comply. This is a common mistake among buyers who purchase materials themselves without checking the certification status.
2. The installation does not meet the technical requirements: even certified materials can be rejected if the installation has not been carried out correctly. Think of uneven infill distribution, open seams or deviating line markings.

So it is not enough to buy good materials. The entire execution has to be right, from the foundation through to the finishing of the playing area. An inspection afterwards can always be requested, but remedial work is costly and time-consuming. Prevention really is better than cure here.

How do you know whether a padel court supplier uses certified materials?

Always explicitly ask a supplier for proof that the materials used are on the Kiwa ISA Sport sports products list. A reliable supplier can show this immediately with certification documents or a reference to the current sports products list. If a supplier cannot provide this, that is a clear signal to ask further questions or to consider another party.

Concrete things you can check or ask for:

• Is the artificial turf product listed on the Kiwa ISA Sport sports products list?
• Does the supplier have documentation for the infill material, including grain size and inspection status?
• Can the supplier provide a technical datasheet for the artificial turf, including fibre type, density and pile height?
• Does the supplier have experience supplying field samples for an official inspection?

Inexperienced buyers are often unaware that using uninspected materials, even unintentionally, has direct consequences for the usability of the court. A supplier who is well informed about the certification requirements protects you, as the client, from this risk. That is exactly why it is worth asking about this when selecting a supplier.

Do the same requirements apply to an indoor and an outdoor padel court?

The sports-technical requirements for the artificial turf are largely the same for indoor and outdoor padel courts. The Kiwa ISA Sport standards for ball bounce, fibre density, line markings and infill distribution apply regardless of whether the court is indoors or outdoors. The difference lies in the additional requirements arising from the environment and the structure.

What is different for outdoor courts?

For outdoor courts, water permeability and wind load play a major role. The foundation must be able to drain rainwater. That is why drainage concrete, Supersub or ZOAB asphalt are used. The steel structure must be calculated for the wind zone of the location. The Netherlands is divided into three wind zones, and the structure must demonstrably meet the wind load that goes with them. This has no direct effect on the Kiwa ISA Sport inspection of the floor, but it does affect the safety and durability of the court as a whole.

What is different for indoor courts?

For indoor courts the water permeability requirement for the foundation falls away. The base is an existing concrete floor or a new foundation inside the hall, which does not need to be water-permeable. The sports-technical measuring conditions for the inspection are the same for both types: a flat, rigid concrete floor with a minimum thickness of 100 mm and a stiffness of 40 MPa. The dimensions of the playing area are also identical for both types: 20 x 10 metres, with a tolerance of plus or minus 10 centimetres.

In short: the floor standards are the same, but the structural and foundation requirements differ considerably. For outdoor courts the total scope of the project is larger, which is also why the costs are higher than for indoor courts.

At I-Padel we work exclusively with artificial turf and infill material approved by Kiwa ISA Sport. We are happy to guide you through the whole process, from the first site exploration to the handover of a certified padel court that meets all applicable standards. Get in touch for an initial exploration. We are happy to think along with you, without obligation, about what your location needs.

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