90 days. No more, no less. Since last year, any pool that is built must be reported to the tax authorities within this specific timeframe, under penalty of hefty fines. Those who think they can escape the rule by opting for an above-ground model are in for a surprise: if the structure remains installed for more than three months, the tax office may well come knocking. The rules are changing, and so are the benchmarks.
Soon, homeowners will have to deal with a completely revamped tax framework. By 2026, building a pool will have broader impacts on the tax bill. The rates are tightening, temporary exemptions are receding, and the calculations for the development tax or property tax are becoming significantly less favorable. For anyone wanting a pool in their garden, it has become impossible to overlook the budget aspect from the project’s conception.
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The different taxes applicable to pool construction
Before starting the work, it’s important to know what to expect in terms of taxes: three major contributions await every new pool owner. Here are the main ones to consider from the planning stage:
- development tax
- property tax
- and sometimes residential tax
Each tax has its own rules, quite different from those of traditional real estate. The development tax applies to both in-ground and semi-in-ground pools and is levied once the pool is completed, calculated based on a national rate to which local rates are added. The installation of a closed and covered shelter also triggers this payment. However, only removable above-ground pools used for less than three months slip through the cracks.
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The property tax comes into play as soon as the pool increases the value of a property. It is recalculated each year based on the cadastral rental value, thus increasing the owner’s bill, unless the pool is mobile or remains removable, in which case it is usually not affected. Regarding the residential tax, only secondary residences are concerned, but they may see the bill rise due to a new pool.
For those who want to delve into the details and anticipate each specific case, information on pool taxes on 24 Actualités provides an overview of the procedures, exceptions, and all the pitfalls to avoid.
How to calculate and declare your pool-related taxes?
Calculating the development tax amount
The calculation method for the development tax is straightforward: measure the surface area of the pool in square meters, apply a national rate set at €200 per square meter, and then multiply by the rates decided by the municipality and the department. These percentages vary, so two owners of identical pools may not necessarily pay the same amount. Payment is made in one or two installments, depending on the amount due.
Prior declaration and administrative procedures
Even before the first shovel of dirt is turned, a prior declaration of works to the town hall is required. The Cerfa form n°13703 must be correctly filled out, accompanied by plans and a description of the desired pool. This administrative step not only conditions the legality of the work but also the integration of the pool into the calculation of your future taxes.
To ensure compliance, several steps follow after construction:
- Declare the completion of the work to the tax authorities within 90 days of the end of the project.
- The property tax office will then adjust the property tax to reflect the value of the property including this new feature.
In some cases, this declaration grants a temporary exemption from property tax, often for two years. It is advisable to check the local rules with the tax office, as they can vary depending on the municipality or the exact type of pool.
New tax rules starting in 2026: what will change for homeowners
Automation of control and detection of undeclared pools
With Innovative Property, a new chapter is opening. The state is relying on artificial intelligence combined with satellite images to identify, throughout France, pools that have been forgotten in tax files. Starting in 2026, any undeclared construction will be uncovered without delay, and the era of small pools hidden at the back of the garden is coming to an end.
Concrete measures will accompany this mass control:
- Mandatory declaration for every new structure.
- Any omission exposes the owner to an immediate tax adjustment.
- In case of violation, a fine will complement the regularization. The exact amount remains to be known.
Implications for local taxation and secondary residences
The adjustment of the property tax will now be automatic; tax services will have updated information in real time. Secondary residences in tourist areas will be scrutinized, potentially leading to an increase in development tax or residential tax, sometimes even with a retroactive effect over several years.
Through the cross-referencing of building permits, aerial photographs, and cadastral files, the tax authorities have all the tools to put an end to irregularities. Off-the-grid pools, once invisible, will no longer escape this sought-after real estate scrutiny. Today, embarking on a project without any notification is a lost bet from the start. Discretion is no longer on the agenda: every pool will now take its place in the official inventory, line by line, tax by tax.