PLU in France: How to Read the Local Urban Plan
What Is the PLU?
The Plan Local d’Urbanisme (PLU), or Local Urban Plan, is the key regulatory document governing land use within a French municipality or group of municipalities (known as PLUi — intercommunal plan). It replaced the former POS (Land Use Plan) under the SRU law of 2000.
The PLU defines precisely what you are allowed to build, where, and under what conditions. It is therefore absolutely essential reading for any building project in France.
The Four Main Zones
The territory covered by the PLU is divided into zones, each subject to specific rules:
| Zone | Full name | Characteristics |
|---|---|---|
| U | Urban Zone | Already urbanised and serviced. Building permitted under conditions. |
| AU | Zone to be Urbanised | Designated for future development. May be buildable subject to infrastructure works. |
| A | Agricultural Zone | Reserved for farming. Building is highly restricted (farm buildings only, generally). |
| N | Natural Zone | Protected natural areas. Building is virtually prohibited. |
in zone...} --> B[U - Urban] A --> C[AU - To be Urbanised] A --> D[A - Agricultural] A --> E[N - Natural] B --> F[BUILDABLE] C --> G[BUILDABLE
WITH CONDITIONS
Check regulations] D --> H[HIGHLY RESTRICTED
Rare exceptions] E --> I[NOT BUILDABLE] style A fill:#0F4C81,stroke:#0F4C81,color:#fff style B fill:#FDFCF9,stroke:#C67A3C,color:#0F4C81 style C fill:#FDFCF9,stroke:#C67A3C,color:#0F4C81 style D fill:#FDFCF9,stroke:#C67A3C,color:#0F4C81 style E fill:#FDFCF9,stroke:#C67A3C,color:#0F4C81 style F fill:#56C6A9,stroke:#56C6A9,color:#fff style G fill:#F58220,stroke:#F58220,color:#fff style H fill:#6B5876,stroke:#6B5876,color:#fff style I fill:#CD212A,stroke:#CD212A,color:#fff
💡 Tip — Before even visiting a plot of land, check which zone it falls in. If the land is in an A or N zone, it will be very difficult — or impossible — to build a residential home there.
Each zone is often subdivided (UA, UB, UC, AUa, AUb, etc.) with rules that vary between sub-zones. Take the time to read the full regulations for the relevant zone.
Key Information to Look For
When reading the zone regulations, pay close attention to the following:
Building Coverage Ratio (CES)
The CES determines the maximum ground footprint your building can occupy relative to the plot area. For example, a CES of 0.4 on a 500 m² plot means your building footprint cannot exceed 200 m².
Maximum Height
Height is usually expressed in metres to the ridge (highest point of a pitched roof) or the parapet (top edge of a flat roof). It varies by zone — often 9 m in suburban areas, sometimes more in denser districts.
Setback Rules
Setbacks define the minimum distance between your building and:
- The road (alignment or setback from the street)
- Side boundaries (the boundaries with neighbouring properties)
- Other buildings on the same plot
⚠️ Warning — Failure to comply with setback rules is one of the most common reasons for building permit refusal. Check these distances carefully and incorporate them from the very first sketch of your project.
External Appearance
The PLU may impose constraints on materials, facade colours, roof type (tiles, slate, whether flat roofs are permitted), fencing, and so on.
How to Consult the PLU
There are several ways to access the PLU for your commune:
1. At the Town Hall
Visit the planning department of your local mairie. Staff can show you the zoning map, the written regulations and the appendices. It is also a good opportunity to ask questions.
2. On the Municipal Website
More and more communes publish their PLU online, often as downloadable PDFs. Look under sections like “Urbanisme” or “Aménagement du territoire”.
3. On the National Planning Portal
The website geoportail-urbanisme.gouv.fr is the national platform. You can search for a plot and view the applicable zoning, then download the regulatory documents.
4. Request a Planning Certificate
The informational planning certificate (CUa) tells you the rules applicable to a given plot. The operational certificate (CUb) goes further by specifying whether your specific project is feasible. Response time: 1 to 2 months.
PLU Consultation Checklist
- Identify the zone (U, AU, A, N) of your plot
- Read the written regulations for the relevant zone
- Check the building coverage ratio and maximum height
- Check setback rules (road + side boundaries)
- Review any easements (access, utilities, listed buildings)
- Check external appearance constraints (roof, colours, materials)
- Request a planning certificate if needed
- Check whether the PLU is under revision (rules may change)
Key Takeaway
The PLU is your regulatory compass. Consulting it early on will prevent you from designing an unfeasible project and will save you valuable time when submitting your building permit. Take the time to understand the rules before drawing your first plans.