If you want to build a padel court for official use, sooner or later you’ll come across the name Kiwa ISA Sport. This is the body in the Netherlands responsible for the inspection and certification of padel court materials and sports surfaces. Without a valid Kiwa ISA Sport certificate, a padel court may not be used for official KNLTB (Royal Dutch Tennis Federation) competitions. Below we explain exactly what the certification involves, which components are assessed, and how you, as a client, can be sure you’re getting a Kiwa-certified padel court.
What is the Kiwa ISA Sport certification for padel courts?
The Kiwa ISA Sport certification is an independent product certification for sports surfaces and foundation components of padel courts in the Netherlands. Kiwa ISA Sport assesses whether materials meet the technical requirements of NOC*NSF and the KNLTB. Only products included on the official list of approved sports products may be used for courts intended for competition use.
The certification focuses on the sport-technical properties of the court, such as the quality of the artificial turf, the foundation structure, and ball bounce. It is therefore not a general construction inspection, but specifically addresses whether the court meets the standards for fair and responsible play. Kiwa ISA Sport carries out these certifications as a recognized, independent body, separate from manufacturers or builders.
Why is the Kiwa ISA Sport certification mandatory in the Netherlands?
The Kiwa ISA Sport certification is mandatory because the KNLTB only permits official competitions on courts whose sports surface and foundation have been certified and included on the list of approved sports products. This applies to both new courts and renovated courts as of February 1, 2024. Without a certificate, a court cannot be registered for competition use.
The requirement exists to safeguard the quality of play and to prevent courts with substandard materials from being used for official competitions. A padel court with poor ball bounce, insufficient flatness, or an unstable surface has a direct impact on playing quality and player safety. By making certification mandatory, the KNLTB ensures that all courts used for competition meet the same minimum standards.
The requirement also protects clients. If a builder supplies materials that haven’t been certified, you, as an association or operator, run the risk that your court will not be approved afterward for official use. That’s a costly mistake you can easily avoid by checking in advance whether all materials are on the list of approved sports products.
Which parts of a padel court need to be certified?
The Kiwa ISA Sport certification primarily focuses on the sports surface and the foundation structure of a padel court. Specifically, this concerns the artificial turf including the infill material, the foundation on which the turf lies, and the combination of both layers. The steel structure itself falls outside the scope of this specific certification, but must still meet the structural requirements of the Dutch Building Decree (Bouwbesluit).
-
Artificial turf and infill material
A padel court uses sand-filled artificial turf: a short-pile, polymeric turf fiber with an effective length of 11 to 15 mm, filled with stabilization material to at least 75% of the fiber length. This applies to both indoor and outdoor courts. The turf is tested for sport-technical properties such as shock absorption, ball bounce, flatness, and friction. Only turf that meets these requirements and is included on the list of approved sports products may be used. -
Foundation
The foundation is assessed as part of the overall system. Foundation components must be certified by Kiwa ISA Sport in the Netherlands before they may be used for a certified padel court. This applies to all commonly used foundation types, such as drainage concrete, Supersub, and ZOAB asphalt (porous asphalt). Each foundation variant has its own technical properties and is assessed separately for suitability for padel.
How does the certification process for padel court materials work?
The certification process for padel court materials runs through a licensing process at Kiwa ISA Sport. A manufacturer or supplier submits samples of the turf and foundation. These are tested in a laboratory according to international standards, including ISO and EN standards. If a product meets all sport-technical requirements, it is added to the list of approved sports products.
Samples of sand-filled artificial turf are conditioned in advance: after filling with infill material, the mat is spread using a rake or brush, so that the test conditions match real-world practice. The measurement methods are laid down in international standards and NOC*NSF measurement methods. For every measurement result, the average must meet the specified requirements, and each individual measurement result must also fall within the standards.
As a client, you don’t need to go through this process yourself. Your responsibility is to check whether the materials used by your supplier are already certified and included on the list of approved sports products. Always ask about this explicitly when requesting a quote, and don’t settle for vague assurances.
What are the risks of a padel court without Kiwa ISA Sport certification?
A padel court without Kiwa ISA Sport certification may not be used for official KNLTB competitions. This means an association or operator can still use the court for recreational purposes, but competitive players may not play official matches on it. For tennis clubs and associations that want their members to take part in competitions, this is a serious problem.
Besides the loss of competition opportunities, there are also financial risks. If it turns out afterward that the materials used were not certified, it may be necessary to replace the sports surface or foundation in order to still meet the requirements. Those costs come on top of the investment already made. In the worst case, a newly built court may have to be partially demolished and rebuilt.
There is also a safety aspect. The Kiwa ISA Sport standards are not only meant to ensure fair play, but also to protect players. A sports surface that doesn’t meet the shock absorption or friction standards increases the risk of injury. Certification is therefore also a quality guarantee for everyone who plays on the court.
How do you recognize a certified padel court supplier?
A certified padel court supplier works exclusively with materials that are on the Kiwa ISA Sport list of approved sports products and can demonstrate this with concrete product documentation. Always ask for the certificate numbers or product descriptions of the turf and foundation components being used. A reliable supplier will answer this directly and transparently.
In addition, there are several practical signals that indicate a serious party:
- They know the Kiwa ISA Sport standards and can explain which products they use and why.
- They provide structural calculations per location, tailored to wind load and soil conditions.
- They work with certified foundation materials such as drainage concrete, Supersub, or ZOAB asphalt, and can justify the choice based on your specific location.
- They offer a warranty on the steel structure and are transparent about what is and isn't covered by the warranty.
- They actively guide you through the permit process, including the inspection after completion.
Be alert to suppliers who remain vague about certification or who claim that certification can be arranged later. For new builds or renovations from 2024 onward, the Kiwa ISA Sport requirement applies without exception to courts used for competition. A supplier who doesn’t know this or talks around it poses a risk to your project.
At I-Padel, we work exclusively with certified materials that meet the Kiwa ISA Sport requirements. We know the list of approved sports products, advise you based on your location, and make sure that after completion the court is genuinely suitable for official use. Want to know what this means for your project? Get in touch for an initial, no-obligation conversation — we’re happy to think it through with you.
Frequently asked questions
Can I check the Kiwa ISA Sport list of approved sports products myself to verify materials?
Yes, the list of approved sports products from Kiwa ISA Sport is publicly available and can be consulted via the Kiwa ISA Sport or NOC*NSF website. It is strongly recommended to verify the product and certificate numbers provided by a supplier against this list yourself before signing a contract. This way you can be sure that the materials being used are actually approved for your specific situation.
Does the Kiwa ISA Sport certification requirement also apply to existing padel courts built before 2024?
For existing courts built before February 1, 2024 that were already in use for competition, transitional provisions apply. The new requirement primarily applies to new builds and renovations from that date onward. If you’re unsure whether your existing court still complies, or whether it needs to be recertified during a renovation, contact the KNLTB or a certified supplier to have your specific situation assessed.
What is the difference between an indoor and outdoor padel court in terms of Kiwa ISA Sport requirements?
The sport-technical requirements for the turf and infill material are the same for both indoor and outdoor courts: both must meet the same standards for shock absorption, ball bounce, flatness, and friction. The difference lies mainly in the foundation structure and material choice, since an outdoor court has to deal with weather conditions such as rain and frost. Always discuss with your supplier which certified foundation variant is best suited to your specific location and situation.
How long is a Kiwa ISA Sport certificate valid, and does it need to be renewed periodically?
A Kiwa ISA Sport product certification is tied to the specific product of the manufacturer or supplier and has a validity period determined and monitored by Kiwa ISA Sport. As a client, you don’t need to renew the certification yourself, but it is wise to check, in the event of a major renovation or replacement of the sports surface, whether the materials to be used are still on the current list of approved sports products. Products can be removed from the list if they no longer meet the applicable standards.
What should I do if my supplier goes bankrupt after the padel court has been built — does the certification then lapse?
The Kiwa ISA Sport certification is tied to the product itself, not to the supplier who built the court. If the materials were on the list of approved sports products at the time of construction and were installed correctly, the court in principle remains suitable for official use. However, it is wise to ensure you have complete product documentation, certificate numbers, and construction records at the time of contract completion, so that you have all the necessary information yourself in the event of a supplier’s bankruptcy.
As a client, can I choose a different artificial turf supplier than the one recommended by my court builder?
In principle, yes, but this is strongly discouraged unless you are certain that the alternative turf is on the Kiwa ISA Sport list of approved sports products AND that the combination with the chosen foundation is also certified. The certification assesses the total system of turf and foundation together, and a change in one of the components can affect the approval. Always consult with your court builder first, and if in doubt, contact Kiwa ISA Sport directly before making a different material choice.
Are additional inspections needed after the padel court is completed?
After completion, in some situations it is required or strongly recommended to have a final measurement or inspection carried out, checking whether the court was built in accordance with the specifications. This can be relevant for registration with the KNLTB for competition use. A good supplier actively guides you through this process and ensures that all documentation, measurement reports, and certificates are complete and transferable after completion.
