Development permits with Claude: connect plots, access and documents

Prepare a development application record with Claude →

An owner wants to divide a large plot into three building lots, with a shared access road serving all three. Their architect recalls that "a subdivision only needs a permit from three lots onward" — a rule that did once exist, but was dropped by a reform in force since 2012. Relying on that memory rather than the current text of the Code de l'urbanisme would lead here to choosing the wrong regime for this application.

The permis d'aménager (development permit) governs operations that create building lots and, often, the shared roads and facilities serving them. Since the 2012 reform, the definition of a subdivision (lotissement) no longer rests on a minimum number of lots: it is the presence or absence of shared roads, spaces or facilities to be created that determines whether a development permit is required, or whether a simple prior declaration is enough.

This article details the current definition of a subdivision, what distinguishes a development permit from a simple prior declaration, the instruction timeline and the current CERFA form, and the method for organizing a lot table that never double-counts shared areas.

Summary

1. The current definition of a subdivision: a lot count is no longer the criterion
2. Development permit or simple prior declaration: what makes the difference
3. The threshold for engaging an architect or landscape designer
4. The instruction timeline and the current CERFA form
5. Preparing the lot table step by step
6. When a development permit is not enough
7. What we observe among independent architects
8. Training to make development applications more reliable
9. Frequently asked questions

The current definition of a subdivision: a lot count is no longer the criterion

Article L442-1 of the Code de l'urbanisme defines a subdivision as "the division, in ownership or in enjoyment, of a land unit or of several contiguous land units, aimed at creating one or more lots intended to be built on." The current text sets no minimum threshold of lots: a division creating even a single building lot can, depending on the circumstances, fall within this definition exactly like a division into ten lots.

A rule inherited from before 2012, no longer to be applied

Before the reform in force since 2012, the subdivision regime depended in particular on the number of lots created over a given period. That rule has disappeared from positive law: a document template or professional habit that still reasons in terms of "number of lots" to determine whether a procedure applies rests on a text that is no longer in force, and must be corrected before any new operation.

Development permit or simple prior declaration: what makes the difference

What today distinguishes a development permit from a simple prior declaration for a subdivision operation is not the number of lots, but the nature of the planned works.

Other operations also fall under the development permit without being subdivisions in the strict sense: campsites beyond a certain number of people or pitches, residential leisure parks, parking areas of significant capacity, or earthworks exceeding certain depth and area thresholds — each of these thresholds must be checked against the current text rather than inferred by analogy.

The threshold for engaging an architect or landscape designer

For a subdivision operation where the area of land to be developed exceeds 2,500 m², engaging an architect or a landscape designer becomes mandatory to draw up the project, according to Service Public. Below that threshold, doing so remains possible but is not imposed by the regulations for this type of operation.

The instruction timeline and the current CERFA form

The instruction timeline for a development permit depends on the nature of the operation and the plot's situation.

An incomplete application is met with a request for additional documents, generally within the month following filing, and the reviewing authority then has an additional period to resume the review once the missing documents are received. At the time this article was checked, the CERFA form applicable to a development-permit application carries reference 16297*05; like any planning form, this reference must be verified on service-public.gouv.fr on the filing date.

Preparing the lot table step by step

Step 1: Set a single reference per lot, used consistently everywhere. The lot table, the descriptive narrative and the drawing must use exactly the same numbering, never renaming a lot differently from one document to another.

Step 2: Distinguish the land area, the lot areas and the shared areas. The total area of land to be developed is not simply the sum of the individual lot areas: shared roads and spaces must appear as a distinct category, never split and double-counted within each lot's total.

Step 3: Identify existing utilities and the studies still needed. A utility capacity — water, electricity, sewerage — not confirmed by the relevant operator remains a missing data point to be checked, never a connection presented as secured in the application.

Step 4: Check the procedure applicable to the operation using local data. The sector's classification and any municipal deliberation subjecting every subdivision to the development permit must be confirmed with the town hall before treating a prior declaration as sufficient.

Step 5: File the complete application and keep proof of filing. It is that date which starts the applicable instruction timeline, and serves as the reference for any later request for additional documents.

When a development permit is not enough

A properly prepared development-permit application does not close out every step of a subdivision operation. Every future construction on the created lots will, in principle, need its own building-permit or prior-declaration application, reviewed independently of the development authorization already obtained. A utility capacity announced as sufficient without written confirmation from the relevant operator — the drinking-water service, the electricity network operator — remains a working assumption, not an established fact for the file: it must be verified before filing, otherwise the reviewing authority may request additional information that delays the review. A note prepared with AI assistance helps structure the project description and the lot table, but on its own it establishes neither an authorization obtained nor the technical feasibility of the planned connections.

What we observe among independent architects

In our exchanges with independent architects about their subdivision applications, the most frequent confusion is not about the content of the application itself, but about the applicable regime: the old "number of lots" reference point remains ingrained in habits, while the current criterion is based on shared roads and facilities. Checking this point before choosing between a development permit and a prior declaration avoids filing, and then correcting, the wrong type of application — a correction that costs more time than a check made upfront.

Training to make development applications more reliable

A lot-table template is not enough if the applicable regime is determined from a rule that is no longer in force. For an architect practising as a self-employed professional (NAF code 7111Z in France), the FIFPL fund covers part of the cost of Qualiopi-certified training under 2026 criteria set at €300 per day and €900 per year, with e-learning capped at 50% of the daily rate. This funding must be arranged before training starts, not after.

Frequently asked questions

Do you need at least three lots for a project to qualify as a subdivision?

No: since the reform in force since 2012, Article L442-1 of the Code de l'urbanisme defines a subdivision with no minimum threshold of lots, and a division creating even a single building lot can fall within that definition depending on the circumstances. The old rule based on the number of lots created over a given period is no longer in force and must no longer be applied. A document template or professional habit still built on that abandoned reference point must be corrected before any new application, or it will apply a regime that no longer matches current law.

Does a two-lot subdivision with no shared road require a development permit?

Not necessarily: if the operation creates no shared road, space or facility, and if the plot is neither in a protected sector nor in a municipality that has subjected every subdivision to the permit by deliberation, a simple prior declaration may be enough. It is the nature of the planned shared works, not the number of lots, that determines the applicable regime. This classification must be checked as soon as the project is designed, since it determines both the documents to gather and the applicable instruction timeline.

Is engaging an architect mandatory for every subdivision project?

No: that becomes mandatory only when the area of land to be developed exceeds 2,500 m², a threshold beyond which an architect or a landscape designer must draw up the project. Below that threshold, engaging one remains possible but is not imposed by the regulations applicable to this operation. This threshold is assessed on the total area of land to be developed, not just the planned built area, which should be checked from the project's earliest sketches.

Can a utility capacity be stated as sufficient without confirmation from the operator?

No, or more precisely, it should not be presented as established: a utility capacity not confirmed by the relevant operator must appear in the application as data to be checked, not as a guaranteed connection. Presenting an assumption as a certainty exposes the application to requests for further information that lengthen review rather than secure it. Requesting that confirmation early enough while preparing the application avoids discovering a capacity problem after filing, when fixing it becomes far more costly in time.

Once the development permit is obtained, are future constructions on the lots automatically authorized?

No: the development permit authorizes the division of the land and, where relevant, the creation of shared roads and facilities, but every future construction on a created lot will need its own building-permit or prior-declaration application, reviewed independently of the development authorization. The rules applicable to those future constructions must be checked at the time they are filed, not inferred from having obtained the development permit. This point deserves being clearly explained to future lot buyers, so they do not wrongly assume a building permit will be automatically granted simply because the development permit was obtained.

A reliable development-permit application rests on three elements that do not change from one operation to the next: an applicable regime determined by the nature of the shared works rather than the number of lots, a lot table that never double-counts shared areas, and utility data that is checked rather than assumed. Once that foundation is in place, it is exactly what the development-file generator organizes, never substituting for the competent service's review.

For the constructions that will follow on each created lot, our method for organizing a building-permit file details the documents expected for that next step.

Training 100% fundable via OPCO/FIFPL. Qualiopi-certified programme. To structure your planning applications and contractual documents with AI as part of our AI for architectural management training, contact Educasium and specify your status (employee, self-employed, business owner) and your goal.