Building Permits in the Alpes-Maritimes: What You Need to Know in 2026

Building Permit vs. Prior Declaration: What’s the Difference?

In the Alpes-Maritimes (06) and the Var (83), any construction or building alteration must comply with planning regulations. Two main procedures apply: a building permit for projects exceeding 20 m² of floor space (or 40 m² in urban zones governed by a local land-use plan, or PLU), and a prior declaration for smaller-scale work (window replacements, fences, swimming pools under 100 m², etc.).

In Antibes, Cannes, Grasse, Nice, or Toulon, local regulations (PLU, PLUi, RNU) can impose additional constraints. For example, in coastal zones, the Loi Littoral (Coastal Law) restricts construction near the shoreline. It is therefore essential to check the zoning before submitting an application.

When Is a Building Permit Required?

A building permit is mandatory for:

• New constructions exceeding 20 m² of floor space (or 40 m² in urban zones with a PLU).
• Extensions that bring the total floor space above these thresholds.
• Constructions taller than 12 metres.
• Changes of use for a building (for example, converting a garage into living space).

On the other hand, a simple prior declaration is sufficient for:

• Extensions under 20 m² (or 40 m² in urban zones).
• Swimming pools under 100 m².
• Fences, walls, and terraces.
• Work affecting the building’s exterior appearance (painting, facade renovation, roofing).

Key Steps for a Successful Application

A building permit or prior declaration application must be complete and accurate. Here are the essential documents required:

• The appropriate Cerfa form (13406 for a building permit, 13703 for a prior declaration).
• A site location plan.
• A site plan showing the buildings to be erected or altered.
• Cross-section and elevation drawings.
• A descriptive project notice.
• Graphic documents (landscape integration, photomontages).

A common mistake is overlooking public utility easements (listed historic monuments, protected sites, natural hazards). In the Alpes-Maritimes, seismic, flood, and land-movement risk zones are widespread. A surveyor can help you check these constraints.

Processing Times and Review

The standard processing time is 2 months for a building permit and 1 month for a prior declaration. This period can be extended if the project requires consultation (the Architect of Historic Buildings, a safety commission, etc.). If the application is incomplete, the town hall may request missing documents, which extends the timeline.

In Nice, for example, processing times can be longer due to urban density. In Toulon, heritage protection zones often require additional approvals. It is therefore wise to prepare a flawless application from the outset.

Appeals and Risks

A building permit can be challenged by third parties within 2 months of the notice being posted on site. Appeals are common in the South-East, often citing loss of view, loss of sunlight, or non-compliance with the local land-use plan. A measurement or drafting error can lead to a permit being refused or annulled.

Working with a building expert and surveyor like Cassini Expertise helps secure your project. We carry out precise topographic surveys, boundary marking plans, and site layout studies. We also check the project’s compliance with local planning regulations.

Why Work With a Professional?

A professional helps you to:

• Avoid errors in surface area and height calculations.
• Comply with legal setback distances from property boundaries.
• Anticipate constraints related to terrain (slope, levelling).
• Build a solid application file for the review process.

In the Alpes-Maritimes and the Var, plots of land are often sloped. A precise topographic survey is essential for calculating earthworks and the building’s layout. In Grasse, for instance, the hills require technical adaptations. In Antibes, proximity to the sea can impose specific rules.

Conclusion: Prepare Your Project With Cassini Expertise

Whether you’re in Nice, Cannes, Toulon, or a rural municipality in the 06 or 83, the success of your project depends on the quality of your application. Cassini Expertise supports you through every step: topographic surveys, site layout plans, compliance checks, and guidance through the review process.

Call us on 04 22 46 06 04 for a free quote. We work throughout the Alpes-Maritimes (06) and Var (83) departments. Our expertise ensures a compliant application with no unpleasant surprises.

📅 Updated on 23/08/2026 — By Cassini Expertise, independent building expert for the 06 & 83 regions. Free quote: 04 22 46 06 04.

Frequently Asked Questions

What is the processing time for a building permit in the Alpes-Maritimes?

The processing time is generally two months for a single-family home and three months for other types of construction. This period can be extended if the project requires consultation with various departments or if documents are missing. If changes are made, the clock resets.

When is a building permit required in the Alpes-Maritimes?

A permit is required for any creation of floor space or ground coverage exceeding 20 m², or for work that alters the structure or exterior appearance. For extensions between 5 and 20 m², a prior declaration is sufficient, unless the project is in a protected zone or extends an existing building beyond 150 m².

What are the specific planning rules for the Alpes-Maritimes in 2026?

Rules depend on each municipality’s local land-use plan (PLU), but specific constraints apply: mountain zones (Loi Montagne), natural hazards (flooding, wildfires), and the coastal strip (Loi Littoral). In flood zones, construction is often prohibited or subject to strict requirements. It is essential to consult the town hall’s planning department before submitting an application.

📅 Mis à jour le 25/09/2026 — Cassini Expertise, expert bâtiment indépendant (06·83·13·40).