In 2026, simulate the development tax for your future shell pool!

Building a fiberglass pool at home is often a carefully considered project. We think about the pleasure of swimming, comfort, increasing the value of our home... but much less about taxation, which includes the development tax.

And yet, this local tax applies in most cases and may raise legitimate questions: how much will it be? Should I include it in my budget now?

To help you see clearly, Aboral Piscines provides you with a pool development tax simulator that is easy to use and designed to give you a realistic estimate.

The goal: to help you calmly anticipate this stage, so that you can approach your shell pool project with a comprehensive, controlled vision and no unpleasant surprises!

What is the development tax for a shell pool?

The development tax is a local tax levied by your municipality, your department, and, only in Île-de-France, by the region. Unlike property tax, which is levied annually, the development tax is paid only once, when you obtain your planning permission (prior declaration or building permit).

The amount depends on three criteria: 

• the surface of your pool, 
• a national flat-rate value set each year, 
• and the rates voted by the local authorities in your area.

An in-ground or semi-inground pool, including a shell pool, is automatically subject to this tax if its surface area exceeds 10 m². However, mini pools smaller than 10 m² are completely exempt.

Pool development tax: 2026 simulator

Are you considering installing an Aboral shell pool?

The development tax is an integral part of your project's overall budget and should be taken into account now. Good news for 2026: the applicable rates are lower than in 2025, which slightly reduces the tax cost of your future swimming pool.

To help you get a clear picture, use our free simulator. Simply enter the dimensions of your shell pool to get an instant estimate of your development tax, based on the rates currently in force in France.

The amount shown is an estimate, intended to help you anticipate your overall budget, as municipal and departmental rates vary depending on your geographical location. To find out the exact rates applicable in your municipality, we recommend that you visit the service-public.fr website or contact your local town hall directly.

How is the development tax for a swimming pool calculated?

The calculation of the development tax is based on a simple formula, but one that requires a clear understanding of each of its components:

Pool surface area (m²) × $251 × (Municipal tax rate + County tax rate + IDF regional tax rate)

1. The surface area of your fiberglass pool

For a shell pool, this is the surface area of the water, calculated by multiplying the length by the width. 

For example, the tax implications for an 8×4 pool (8 meters long by 4 meters wide) is based on a reference surface area of 32 m². For more elaborate shapes of our pools, the surface area is precisely indicated in the technical specifications of the model.

2. The flat-rate value for 2026 

Set at €251 per square meter for all swimming pools in France (excluding Île-de-France for conventional constructions, which have a different scale), this value forms the basis for the calculation imposed. 

It is updated annually on January 1 based on the construction cost index published by INSEE.

3. Local variable rates 

This is where the main variability in the final amount lies:

• The municipal rate can vary from 1% to 5%, or even up to 20% in certain specific urban areas or sectors requiring significant public infrastructure.
• The departmental rate is capped at a maximum of 2.5% and remains the same for the entire department;
• The regional rate applies only in Île-de-France, up to a limit of 1%.

The schedule and terms of payment for the development tax

Payment of the development tax is made according to a specific schedule, which it is important to be aware of in order to plan ahead:

1. Planning permission: Once you have obtained your planning permission (in most cases, a preliminary declaration of work for a swimming pool) that the tax is calculated.
2. Declaration of completion of work: You must declare the completion of your work within 90 days of the end of the project via your personal account on impots.gouv.fr, under the "Real estate" section.
3. Receipt of the notice: The tax authorities will then send you one or two payment notices depending on the amount:

• Amounts less than €1,500: a single payment, due 90 days after completion of the work
• Amounts over €1,500: two equal payments, the first 90 days after completion, the second six months later

Aboral Piscines supports you in your pool shell project

At Aboral Piscines, we firmly believe that a successful pool shell project depends above all on clear information and support at every stage. 

For nearly 40 years, we have been putting our expertise as a French manufacturer at the service of private individuals, helping them to anticipate all the parameters of their project: choice of model, land constraints, local regulations, and integration of ancillary costs, such as development tax. 

Thanks to our network of dealers located throughout France, you benefit from personalized advice tailored to your situation. Our goal: to enable you to move forward with peace of mind, with a comprehensive and controlled vision of your future shell pool, without any unpleasant surprises.

Configure your Aboral shell pool now on our website and get a complete estimate including the cost of your pool and installation fees. Our teams are available to answer all your questions and guide you toward the smooth completion of your project.