1 Chemin des Rozelands, 78250 Mézy-sur-Seine

Cadastral parcel of 814 m² (recorded area). Planning document zoning: urban zone (UDa3).

Recorded area: 814 m²
Planning zone: UDa3Urban zone (U)

Address from France’s national address register (BAN), associated with this parcel for information only. Addresses and how they are linked

The parcel (in colour) and its neighbours, from the cadastre; computed perimeter: 169 m. North is up; the bar gives the scale.

The cadastre is a tax record: it does not prove ownership. Why?

The cadastre is a tax record: it does not prove ownership and its boundaries have no legal force (only a surveyor's boundary marking does). Its plan is approximate: especially where it is old, it can be offset by a few metres from the buildings and the aerial imagery. The owner's name is not shown. Boundary marking (Service Public, in French)

At a glance

Computed area: 764 m²from the cadastral plan
Perimeter: 169 mcomputed from the cadastral plan
Addresses: 4 linked addresses
Clay soils: High exposure (100% of the parcel)
Risk prevention plans: 1 plan recorded

This parcel’s figures, from the cadastre, the national address base (BAN), IGN’s BD TOPO and the risk databases. Missing data is not shown.

What this means for a project

Zone UDa3: before an extension, a shed or a division, read this zone’s rules (height, footprint, setbacks from the street and the boundaries). Guide: Turn the map finding into a specific question
3 prescriptions, information areas or easements touch the parcel (details below): they apply on top of the zone’s rules. Guide: Read the documents, not just the colour
Clay soils: High exposure (100% of the parcel). General rule in medium or high exposure areas: the seller of unbuilt buildable land supplies a preliminary geotechnical study where planning rules permit individual houses. Exposure alone does not establish that this sale is covered. Construction projects are subject to separate rules to check with the professional. Géorisques: soil studies and construction
Délimitation du périmètre des zones de risques liés à la présence d'anciennes carrières covers 100% of the parcel: its rules may forbid or restrict building; read them before any project. Guide: Identify the scope of each finding

Points drawn from this parcel’s data. They tell you which questions to ask; they do not replace a certificat d’urbanisme or the official statement of risks.

Understanding the map information

Planning zoning

UDa3 – Urban zone (U)

Urban zone family. This category does not establish permission to build: check the local code, applicable rules and parcel constraints.

100% of the parcel
Document: 200059889_PLUI_20260205

Addresses

Source: Base Adresse Nationale (national address register). “Linked by its position”: the address point lies inside the parcel. “Linked by its building (RNB)”: the building that carries the address in the national building register (Référentiel National des Bâtiments) stands on the parcel. “Linked by IGN (BAN PLUS)”: IGN matches the address to this parcel, the nearest one on the same side of the street, and the address point lies inside it. In these cases the Base Adresse Nationale declares no link.

1 Chemin des Rozelands, 78250 Mézy-sur-Seine (linked by IGN (BAN PLUS))
2 Chemin des Rozelands, 78250 Mézy-sur-Seine (linked by IGN (BAN PLUS))
3 Chemin des Rozelands, 78250 Mézy-sur-Seine (linked by its position)
4 Chemin des Rozelands, 78250 Mézy-sur-Seine (linked by IGN (BAN PLUS))

All addresses in Mézy-sur-Seine

Local plan prescriptions

For guidance only, from the Géoportail de l'Urbanisme extraction of 15 August 2026; the linked document may have been replaced since. Only the planning document's regulations and annexes are binding. A missing item means “not recorded”, not “no constraint”.

National clay exposure (BRGM/Géorisques) and labels in the local planning document are separate sources: dates, methods and purposes may differ. Both values are retained; neither replaces the other. Check the national map and local rules with the authorities. Data versions: national clay layer 2026-07-02; GPU extraction 2026-08-15. Géorisques: soil studies and construction

Not recorded in the Géoportail de l'Urbanisme

Local plan information

Urban pre-emption right: Droit de préemption urbain – 100% of the parcel
Local advertising rules: Zone couverte par le Réglement National (PNR du Vexin Français) – 100% of the parcel

See the document on the Géoportail de l'Urbanisme

Public-utility easements

Listed monument and its surroundings: Château de Mézy – 100% of the parcel

See the document on the Géoportail de l'Urbanisme

Risks

This information is for guidance only and has no regulatory force: it does not replace the risk statement (état des risques, ERRIAL) to be attached to a sale or a rental, which anyone can produce free of charge on Géorisques.

Some clay soils swell when wet and shrink as they dry, which can crack buildings. The higher the exposure, the more building precautions are needed. A risk prevention plan (PPR) maps the areas exposed to a hazard (flooding, ground movement, an industrial site…) and sets building rules there. The Géoportail de l'Urbanisme does not list every plan yet.

Clay shrink-swell: High exposure (100% of the parcel)
Risk prevention plan: Natural or mining risk plan (PM1) – Délimitation du périmètre des zones de risques liés à la présence d'anciennes carrières – 100% of the parcel
Seismic zone: Zone 1 (very low)
Radon potential: Category 1 (low)

Produce the risk statement (ERRIAL) on Géorisques Risks near an address (Géorisques)

The parcel in its section

By recorded area, larger than 65% of the 546 parcels of section ZD whose area is recorded.
Median recorded area in the section: 515 m².
91 of the section’s 548 parcels have a linked building, 107 an address.
Mézy-sur-Seine has 2,675 parcels; this one holds 0.02% of their total recorded area.

Details

Cadastral reference: 78403 000 ZD 756 (78403000ZD0756)
Commune: Mézy-sur-Seine (78403)
Prefix: 000
Section: ZD
Number: 756
Recorded area (contenance): 814 m² Contenance arpentée (measured on site).
Computed area: 764 m² Computed from the plan, may differ from the recorded area.

Planning in this commune

Planning document: Intermunicipal zoning plan (PLUi) (200059889_PLUi_20260205)

Find the applicable document on the official GPU map

Document identified in the data, without assurance that it covers the whole commune or every parcel. Several documents may apply. Check coverage and the current version with the town hall or GPU. For guidance only, from the Géoportail de l'Urbanisme extraction of 15 August 2026; the linked document may have been replaced since. Only the planning document's regulations and annexes are binding. A missing item means “not recorded”, not “no constraint”.

Planning zones (share of parcel area):

Agricultural zone (A) (41%)
Natural and forest zone (N) (38%)
Urban zone (U) (21%)
Development zone (AUc) (0%)

Source datasets used on this page: 6. Their dates and reuse terms can differ.

Sources and versions used on this page

Plan cadastral informatisé (Etalab) 2026-06-01 — Licence Ouverte / Open Licence 2.0
Cadastre Etalab redistributes the French digital cadastral plan in simplified geographic formats, including parcels, sections and buildings. Mapped boundaries do not replace a boundary survey.
Géoportail de l’Urbanisme — extraction nationale 2026-08-15 — Licence Ouverte / Open Licence 2.0
The national Urban Planning Geoportal extraction brings together layers published by the GPU from documents supplied by municipalities, intermunicipal authorities and state services. The competent authorities remain responsible for the documents and their regulatory meaning.
Base Adresse Nationale (listes d’adresses et géocodage Géoplateforme) 2026-10-07 — Licence Ouverte / Open Licence 2.0
The Base Adresse Nationale brings together French addresses, including those published by municipalities. Address coordinates alone do not establish an administrative link to a cadastral parcel.
Exposition au retrait-gonflement des argiles 2026-07-02 — Licence Ouverte / Open Licence 2.0
The clay shrink-swell exposure map describes geological exposure at the map’s scale. It does not replace a site-specific geotechnical investigation.
Zonage sismique de la France (décret n° 2010-1255), liste version janvier 2015 2018-07-30 — Licence Ouverte / Open Licence 1.0
This vector layer published by wpd is based on the BRGM / planseisme.fr list of municipalities and seismic zones, January 2015 version. Municipal zoning does not measure the structural risk of an individual building.
Potentiel radon des communes (arrêté du 27 juin 2018) 2019-05-06 — Licence Ouverte / Open Licence 1.0
Radon potential zoning classifies municipalities according to their geological potential to emit radon. It does not measure the indoor radon concentration of an individual building.