Beyond the Chalet: How Local Zoning (PLU) Is Changing the French Alps

The Plan Local d’Urbanisme (PLU) is the French planning document that acts as the master key for what can be built, renovated, extended or converted in any given commune — and in the French Alps, it is substantially more than just a zoning plan. It is the strategic tool that mayors use to fight the ‘ghost town’ phenomenon, protect the long-term economic viability of their ski resorts, shape visual heritage, and balance the lucrative second-home market against the need for a living, breathing local community. Because the PLU is set at commune level rather than nationally, the rules vary dramatically from one valley to the next — and understanding those variations is now essential to any serious French Alpine property purchase.

The variation is not decorative. A chalet renovation that is routine in one commune may be completely prohibited in the next. A new-build project that would be welcomed in one resort may trigger mandatory managed-rental obligations in another. A high-density luxury development that fits easily into one village’s PLU may be impossible two valleys away because the local mayor has a specific philosophy about preserving the resort’s character. The difference between understanding the local PLU and not understanding it is often the difference between a successful Alpine property investment and a frustrating one.

This guide walks through the main patterns of PLU variation across the French Alps, the distinct models that different resorts have adopted (the ‘compensatory’ approach of Chamonix, the ‘managed-rental incentive’ approach of the Trois Vallées, the ‘heritage protection’ approach of several smaller villages, and the mixed approaches of most mid-sized resorts), and the practical implications for buyers in 2026. It is based on current PLU documents, mairie consultations and the working experience of the Domosno team with real transactions across the French Alpine market.

The Plan Local d’Urbanisme is the primary urban planning instrument in France, governing what can and cannot be built in any given commune. Every French commune either has its own PLU or falls under a PLU Intercommunal (PLUi) shared with neighbouring communes. The PLU establishes the land-use zones, the building densities, the architectural rules, the protected areas, and the specific development constraints that apply throughout the commune. It is approved by the elected municipal council after public consultation, typically lasts for 10-15 years before revision, and has full legal force — meaning planning applications that fall outside the PLU framework are simply refused.

The reason PLU varies so much across the French Alps is that the underlying economic and social pressures vary hugely from commune to commune. A large purpose-built resort like Les Arcs or La Plagne faces very different planning problems than a historic village like Saint-Martin-de-Belleville or Champagny-en-Vanoise. A commune with chronic ‘cold bed’ problems (second homes empty most of the year) needs different tools than a commune with a strong year-round residential community. And a commune under heavy tourism pressure needs different constraints than a commune trying to attract more visitors. The PLU is the tool each mayor uses to address their specific local problems, which is why no two are identical.

The political economy of PLU is also different from most planning frameworks globally. French communes retain genuine control over their local development, subject to higher-level constraints (SCOT, regional plans, national protected areas), and mayors can be extremely ambitious about using PLU to shape the long-term trajectory of their resorts. Some mayors take a light-touch ‘allow sensible growth’ approach; others take an aggressive ‘protect our commune from cold beds at all costs’ stance. Both are legitimate and both appear in the Alpine PLU landscape. The practical effect for buyers is that you cannot assume anything about local planning without reading the specific PLU for the commune you are buying in.

One helpful framework is to think of PLU as having four main levers: zoning (where you can build), density (how much you can build), use (what kind of building is allowed), and architecture (what the building must look like). Each of these levers is set independently by the local PLU, and different communes place more weight on different levers. The buyer’s job is to understand which levers matter for their specific purchase — renovation, extension, new build, change of use — and how those levers are set in the specific commune.

The central variation in Alpine PLU across most resorts is how aggressively the local commune is fighting ‘lits froids’ (cold beds) — properties owned by second-home owners that sit empty for 48-50 weeks of the year. Cold beds are a real problem for ski resort communes because they generate very little local economic activity (no lift passes, limited shop spending, no restaurant visits, no year-round community) while occupying valuable housing stock and driving up prices for the local workforce. Mayors across the Alps have responded with a range of PLU-based tools, and the specific mix varies dramatically.

At one extreme, communes like Chamonix have adopted what can be called the ‘compensatory’ model. Under this approach, the PLU places strong constraints on new pure second homes, effectively requiring new developments to include a meaningful share of primary residences or ‘warm bed’ managed rental units. In some zones this takes the form of a one-in-one-out policy (for every new second home, one existing stock unit must be converted to year-round residential use), and in others it takes the form of mandatory minimum ratios of resident housing within any new development. The effect is to make it significantly harder to build large new second-home projects, which protects the existing residential community at the cost of slower new supply growth.

At the opposite extreme, communes in the Trois Vallées have largely adopted the ‘managed-rental incentive’ model. Rather than restricting new development, the PLU offers higher density allowances and more favourable building rules to developments that are classified as Résidences de Tourisme — commercial residences managed for tourism rental on a long-term basis, which guarantees the beds will be ‘warm’ even if individual owners use the units only occasionally. A developer building a fully-managed tourism residence can typically build larger and higher than one building pure private chalets on the same plot, creating a strong economic incentive to default to the managed-rental format.

In the middle, most communes mix elements of both approaches. They may limit pure second-home growth in specific zones while offering density bonuses for managed-rental developments elsewhere. They may impose primary-residence quotas in new developments above a certain size. They may attach rental-commitment obligations to the grant of planning permission for larger projects. The specific combination varies commune by commune, and understanding the local mix is essential for any buyer considering a substantial renovation or new development project.

Chamonix is the best-known example of the compensatory approach in the French Alps, and its PLU is one of the most restrictive for new second-home development in the region. Chamonix has faced chronic cold-bed and housing affordability problems for more than a decade — the commune has a large year-round resident population that has been steadily priced out of the housing market by wealthier second-home buyers, and the political response has been a progressively tighter PLU framework.

Under the current Chamonix PLU, certain zones effectively place a moratorium on new pure second-home construction. In these zones, new development is only permitted if it contributes to the primary-residence housing stock or the local-worker housing supply. Compensatory ratios apply in some areas — for example, a requirement that for every square metre of luxury private second home constructed, a specified percentage of social or workforce housing must be delivered alongside. The practical effect is that large new second-home developments are difficult to get through the Chamonix planning process without significant compromise or creative structuring.

For buyers, the Chamonix PLU has important practical implications. It means that the supply of new pure second-home stock in Chamonix is constrained, which supports prices at the top of the market but limits the availability of attractive new-build options. It means that most new development in Chamonix is either renovation of existing stock, conversion of commercial space, or mixed-use projects with primary-residence components. And it means that buyers considering larger projects — a new chalet build, a substantial extension, a change of use — must work carefully with local planning consultants and the mairie to understand what is achievable within the PLU constraints.

The effect on market dynamics is mixed. Constrained new supply supports prices and protects long-term values, which is positive for existing owners. But the restrictive planning environment makes it harder to deliver ambitious new projects and pushes buyer attention toward renovation rather than new construction. This is a trade-off that Chamonix’s local political leadership has deliberately chosen, and it shapes the character of the market in ways that buyers should understand before committing.

The Trois Vallées resorts — Courchevel, Méribel, Les Menuires, Val Thorens, Saint-Martin-de-Belleville, La Tania, Brides-les-Bains — have largely adopted the managed-rental incentive model, though with significant variation between communes within the domain. The underlying philosophy is that rather than prohibiting new development, the PLU should use density allowances and building-rule flexibility to reward developments that keep their beds ‘warm’ through managed rental operations.

In practice, this means that developers proposing Résidence de Tourisme projects can typically build larger, denser and more commercially ambitious developments than those proposing equivalent pure private chalet projects on the same plot. The density bonus can be substantial — sometimes 20-40% more developable floor area — and it is a strong enough incentive that most new Trois Vallées development defaults to the managed-rental format. The result is that the pipeline of new-build apartment supply in the Trois Vallées is dominated by developments that will operate as tourism residences under para-hôtelier management.

For buyers, this has several implications. First, new-build apartments in the Trois Vallées are typically sold under the VEFA framework with integrated para-hôtelier obligations — owners commit to renting the unit under the managed framework for a specified period (often 20 years) in exchange for access to the 20% VAT recovery mentioned in our VEFA guide. Second, the supply of new pure private ski chalets in the Trois Vallées is constrained; most buyers seeking a pure private product end up in the resale market rather than new-build. Third, the overall quality and commercial sustainability of the new-build stock is high because the managed-rental model forces professional operation and maintenance.

Within the Trois Vallées, there is meaningful variation between communes. Saint-Martin-de-Belleville has a stronger heritage-protection focus and tighter architectural rules than Val Thorens, which is a more permissive high-altitude ski station. Courchevel has its own variations between the 1850, 1650, 1550 and Le Praz levels, with the higher levels typically having more aggressive development allowances under the managed-rental model. Buyers should consult the specific PLU for their target commune and level rather than assuming a uniform Trois Vallées framework.

Beyond density and use constraints, many Alpine PLU documents impose detailed architectural rules on what new buildings and renovations must look like. These rules cover roof pitch, roof material (often mandating natural slate or traditional timber shingles in heritage zones), external wall treatment (stone, timber cladding, or specific rendered finishes), window proportions and positioning, balcony styles, colour palettes and even decorative elements. The stringency varies hugely from commune to commune, and it is one of the more surprising aspects of French Alpine planning for buyers coming from more permissive planning regimes elsewhere.

Saint-Martin-de-Belleville is one of the clearest examples of heritage-protected architectural rules. The commune has worked hard to preserve the traditional Savoyard village aesthetic in its main core, and new developments or substantial renovations must respect a detailed set of architectural guidelines. The result is visually coherent and commercially valuable — Saint-Martin’s architectural identity is one of its main selling points — but it also means that buyers cannot simply import their own taste in modernist or contemporary Alpine design without running into planning constraints.

Megève takes a similar approach across most of its core areas, with detailed rules about chalet proportions, roof pitches, and materials. Courchevel Le Praz and the older parts of Courchevel 1550 have heritage zoning that constrains architectural choices in similar ways. Even in more permissive resorts, there are typically specific heritage or visual-impact zones where the usual flexibility does not apply and buyers must work within the architectural framework.

For buyers, the practical implication is that you should always review the architectural rules in the target commune’s PLU before committing to a property that will need renovation or extension. A dream renovation project that assumes modernist glazing, a flat roof, or a contemporary exterior may simply not be achievable under the local PLU, and buyers who discover this after completion can face expensive redesigns or unbuilt projects. Working with a local architect who knows the commune’s PLU intimately is the single best insurance against this risk.

French PLU enforcement is serious, consistent, and much more effective than planning enforcement in many other countries. Planning applications must be submitted to the mairie for any construction, extension, substantial renovation, change of use or even certain types of exterior modification. The mairie reviews the application against the PLU and either grants, refuses, or requires modifications. Work undertaken without planning permission, or in breach of permission, is a legal offence and can lead to demolition orders, fines, and in serious cases criminal penalties.

The Alpine communes typically take enforcement seriously because the PLU is a politically-important tool and the mayor’s reputation is tied to its consistent application. Complaints from neighbours are routine, and the mairie’s building inspectors actively check compliance during construction. This is very different from the weaker enforcement environment in some UK or US markets and it means that buyers cannot realistically plan to ‘do it and apologise later’ — unauthorised works can be caught, documented and required to be removed at the owner’s expense.

For buyers, the enforcement reality means that any planned renovation, extension or change of use should be validated against the PLU before the property is purchased. This is typically done by reviewing the PLU documents directly (they are public and available on the mairie website for most communes) or by consulting a local architect or urbanism specialist. The Domosno team can help facilitate this review for clients working through the buying process, and it is a routine part of our due diligence for clients buying properties where renovation or extension is part of the plan.

The cost of ignoring PLU constraints can be substantial. Projects that proceed without proper permission can be halted mid-construction, required to be reversed, and subject to fines that can run into tens of thousands of euros for significant violations. Insurance cover is also typically voided for unauthorised works, meaning that any subsequent damage or liability falls entirely on the owner. The incentive to work within the PLU framework is overwhelming — there is essentially no downside to doing the planning work properly, and significant downside to cutting corners.

The practical buyer playbook for navigating PLU starts with identifying the commune and reviewing the public PLU documents. Every French commune’s PLU is published on the commune’s official website, typically under ‘urbanisme’ or ‘plan local d’urbanisme’ sections. The documents are free to download and include the zoning plan (plan de zonage), the zone regulations (règlement), the architectural guidelines, and any specific supplementary documents for heritage or environmental zones. The zoning plan shows which PLU zone any given property falls into, and the règlement sets out the specific rules for that zone.

Once you have identified the zone and the specific rules, the next step is to understand what those rules mean for your planned use. A buyer planning a pure private holiday home should check whether the zone permits second-home use without managed-rental obligations. A buyer planning a substantial renovation should check whether the planned works are permitted under the zone’s density and architectural rules. A buyer planning a change of use (for example, converting a commercial space to residential) should check whether the zone permits that conversion and under what conditions.

For most buyers, the best approach is to engage a local architect or urbanism consultant to review the PLU for the specific property. This typically costs a few hundred euros and provides a clear written assessment of what is and is not achievable under the local planning framework. It is cheap insurance against the much larger cost of buying a property and then discovering that the planned works are not permissible. The Domosno team works with a network of trusted local architects and planning specialists across the main French Alpine resorts and can coordinate PLU reviews as part of the pre-purchase due diligence process.

Finally, for buyers planning larger projects — new-build construction, substantial renovations, or complex changes of use — direct consultation with the mairie is usually the right next step. French mairies are generally accessible and helpful on PLU questions, and an early conversation with the local urbanism department can surface issues that would otherwise emerge only during the formal planning application. This is especially important for projects that depend on specific PLU interpretations or that sit close to zone boundaries, where the outcome may depend on the mairie’s discretionary judgement rather than a purely mechanical application of the rules.