27 Rue de l’Helvétie, 91140 Villebon-sur-Yvette

Parcel of 1,788 m² (recorded area) with 2 buildings (residential, outbuilding), built 1901 – 1949. Planning document zones: UHa and N.

Recorded area: 1,788 m²
Planning zone: UHa (72%) · N (28%)Straddles 2 planning document zones.

Open in the map

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: 300 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: 1,973 m²from the cadastral plan
Perimeter: 300 mcomputed from the cadastral plan
Buildings: 2 buildingsResidential, outbuilding
Built: 1901 – 1949
Height to the eaves: up to 6.6 m
Storeys: up to 1 (ground floor included)
Dwellings: 1
Addresses: 1 linked address
Clay soils: High exposure (88% of the parcel), medium (12%)
Risk prevention plans: Not 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 UHa: 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
Zone N: new buildings are in principle excluded; a measured extension of an existing home may be allowed where the rules provide for it. Guide: Turn the map finding into a specific question
The parcel is split between 2 zones: each part follows the rules of its own zone. Guide: Read the documents, not just the colour
10 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 (88% of the parcel), medium (12%). 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
The computed area (1,973 m²) differs by 10% from the recorded area (1,788 m²): for a decision on the size or a boundary, only a chartered surveyor (géomètre-expert) is authoritative. Guide: Read a difference without choosing a figure arbitrarily

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

UHa – Urban zone (U)

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

72% of the parcel
Document: 91661_PLU_20250410

N – Natural and forest zone (N)

Protected natural areas, forests and landscapes: building is strictly limited.

28% of the parcel
Document: 91661_PLU_20250410

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.

27 Rue de l’Helvétie, 91140 Villebon-sur-Yvette (linked by IGN (BAN PLUS))

All addresses in Villebon-sur-Yvette

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

Landscape feature preserved for ecology: Espaces paysagers proteges – 25% of the parcel
Classified woodland (EBC): Espace boise classe – 19% of the parcel

See the document on the Géoportail de l'Urbanisme

Local plan information

Lead exposure risk area: Risque au plomb – 100% of the parcel
Development tax sector: Taxe d'aménagement – 100% of the parcel
Other information: Remontee de nappes - Pas de débordement de nappe ni d'inondation de cave – 100% of the parcel
Other information: Retrait gonflement des argiles - Important – 89% of the parcel
Urban pre-emption right: Droit de preemption urbain – 72% of the parcel
Local advertising rules: Zone de publicite reglementee 1 – 72% of the parcel
Transport noise sector: Zone d'isolement acoustique – 14% of the parcel
Other information: Retrait gonflement des argiles - Modere – 11% of the parcel

See the document on the Géoportail de l'Urbanisme

Public-utility easements

Not recorded in the Géoportail de l'Urbanisme

Buildings

Indicative data (IGN BD TOPO): buildings IGN links to the parcel (BAN PLUS) when they cover at least 20 m² of it, with information from the tax files (DGFiP), anonymised. An unknown height or number is not shown. Construction years are grouped into periods, because old buildings often carry an estimated round year (1800, 1900…). A building standing on several parcels is counted on each, with all its dwellings. Recent buildings may be missing: the tax files are updated with a delay.

On the parcel: 2 buildings
Use: Residential, outbuilding
Height to the eaves: up to 6.6 m
Storeys: up to 1 (ground floor included)
Dwellings: 1
Built: 1901 – 1949

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 (88% of the parcel), medium (12%)
Risk prevention plan: Not recorded in the Géoportail de l'Urbanisme
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 99% of the 380 parcels of section AD whose area is recorded.
Median recorded area in the section: 460 m².
265 of the section’s 380 parcels have a linked building, 240 an address.
Villebon-sur-Yvette has 4,887 parcels; this one holds 0.03% of their total recorded area.

Details

Cadastral reference: 91661 000 AD 661 (91661000AD0661)
Commune: Villebon-sur-Yvette (91661)
Prefix: 000
Section: AD
Number: 661
Recorded area (contenance): 1,788 m² Contenance arpentée (measured on site).
Computed area: 1,973 m² Computed from the plan, may differ from the recorded area.

Planning in this commune

Planning document: Local zoning plan (PLU) (91661_PLU_20250410)

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):

Urban zone (U) (56%)
Natural and forest zone (N) (25%)
Agricultural zone (A) (17%)
Development zone (AUc) (2%)

Source datasets used on this page: 8. 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.
BAN PLUS (rattachement géométrique adresse → parcelle) 2026-06-15 — Licence Ouverte / Open Licence 2.0
BAN PLUS is IGN’s product linking Base Adresse Nationale addresses to reference geographic objects, including cadastral parcels, using geometric matching.
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.
BD TOPO® – bâtiments (usage, hauteur, niveaux, logements, année de construction) 2026-06-15 — Licence Ouverte / Open Licence 2.0
BD TOPO is IGN’s vector topographic reference dataset. Its building component describes footprints and available attributes such as use, height and selected construction information.