42 Rue des Forges, 44300 Nantes
Parcel of 324 m² (recorded area) with 3 buildings (residential, outbuilding), built 1901 – 1949. Planning document zoning: urban zone (UMc).
- Recorded area
- 324 m²
- Planning zone
- UMcUrban zone (U)
Address from France’s national address register (BAN), associated with this parcel for information only. Addresses and how they are linked
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
- 329 m²from the cadastral plan
- Perimeter
- 122 mcomputed from the cadastral plan
- Buildings
- 3 buildingsResidential, outbuilding
- Built
- 1901 – 1949
- Height to the eaves
- up to 6.3 m
- Dwellings
- 1
- Addresses
- 1 linked address
- Clay soils
- Not recorded
- 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 UMc: 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
- 14 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
- Seismic zone 3 (moderate): a new house must follow the earthquake-resistant building rules. Guide: Identify the scope of each finding
- Radon potential category 3: it appears in the information given to buyers and tenants; ventilating and, during works, sealing between the ground and the building reduce exposure. Guide: Prepare the formal risk statement
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
- French planning: who decides what
- The public data behind the map
- Reading and finding a cadastral reference
- Cadastre and boundary surveys: where does the land end?
- Reading a PLU: a zone label does not define a project
- Recorded and calculated parcel area: why two figures?
- Addresses and parcels: why they do not always match
- Parcel owners: what the map does not show and where to ask
- Dividing a plot: preparing a land division
- Property risks: from a map finding to a proper check
Planning zoning
UMc – 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: 244400404_PLUI_20260518
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.
- 42 Rue des Forges, 44300 Nantes (linked by its position)
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”.
- Social housing quota sector
- secteur de renforcement de la mixité sociale – 100% of the parcel
- Development guidelines (OAP)
- Orientation d'Aménagement et de Programmation Loire (OAP) – 100% of the parcel
- Height
- hauteur par niveaux, hors tout – 100% of the parcel
- Parking
- périmètre indicatif de 500 m autour des stations de transport collectif structurant – 100% of the parcel
- Parking
- norme plancher applicable à la sous-destination Logement collectif pour les véhicules à moteur – 100% of the parcel
- Parking
- norme plafond applicable à la sous-destination Bureau pour les véhicules à moteur – 100% of the parcel
- Building placement rules
- recul / retrait minimal – line on the parcel or its boundary
- Height
- hauteur par niveaux, hors tout – line on the parcel or its boundary
See the document on the Géoportail de l'Urbanisme
Local plan information
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”.
- Archaeological site
- zone de présomption de prescription archéologique – 100% of the parcel
- Sanitation zoning
- Zonage d'assainissement des eaux usées – 100% of the parcel
- Sanitation zoning
- zonage pluvial – 100% of the parcel
- Local advertising rules
- Règlement local de publicité – 100% of the parcel
- Energy-saving priority area
- réseau de chaleur – 95% of the parcel
See the document on the Géoportail de l'Urbanisme
Public-utility easements
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”.
- Railways
- SUP T1 de Loire-Atlantique – 64% of the parcel
See the document on 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
- 3 buildings
1 of them also stands on other parcels; dwellings are counted for the whole building - Use
- Residential, outbuilding
- Height to the eaves
- up to 6.3 m
- Storeys
- up to 3 (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
- Not recorded
- Risk prevention plan
- Not recorded in the Géoportail de l'Urbanisme
- Seismic zone
- Zone 3 (moderate)
- Radon potential
- Category 3 (significant)
Produce the risk statement (ERRIAL) on GéorisquesRisks near an address (Géorisques)
The parcel in its section
- By recorded area, larger than 40% of the 447 parcels of section BT whose area is recorded.
- Median recorded area in the section: 350 m².
- 324 of the section’s 447 parcels have a linked building, 228 an address.
- Nantes has 58,099 parcels; this one holds less than 0.01% of their total recorded area.
Details
- Cadastral reference
- 44109 000 BT 226 (44109000BT0226)
- Commune
- Nantes (44109)
- Prefix
- 000
- Section
- BT
- Number
- 226
- Recorded area (contenance)
- 324 m²
- Computed area
- 329 m² Computed from the plan, may differ from the recorded area.
Planning in this commune
- Planning document
- Intermunicipal zoning plan (PLUi) (244400404_PLUI_20260518)
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) (79%)
- Natural and forest zone (N) (20%)
- Development zone (AUc) (1%)
- Agricultural zone (A) (1%)
- Closed development zone (AUs) (0%)
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 2.0Cadastre 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 2.0The 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 2.0The 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 2.0BAN 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 2.0The 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 1.0This 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 1.0Radon 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 2.0BD TOPO is IGN’s vector topographic reference dataset. Its building component describes footprints and available attributes such as use, height and selected construction information.
Neighbouring parcels
- 44109 000 BT 213 – 9 Avenue du Bonheur, 44300 Nantes
- 44109 000 BT 214 – 7 Avenue du Bonheur, 44300 Nantes
- 44109 000 BT 221
- 44109 000 BT 222
- 44109 000 BT 223 – 36 Rue des Forges, 44300 Nantes
- 44109 000 BT 224
- 44109 000 BT 225 – 40 Rue des Forges, 44300 Nantes
- 44109 000 BT 227 – 44 Rue des Forges, 44300 Nantes
- 44109 000 BT 246 – 3 Avenue du Bonheur, 44300 Nantes
- 44109 000 BT 320
- 44109 000 BT 632 – 46 Rue des Forges, 44300 Nantes
- 44109 000 BT 633 – 44 bis Rue des Forges, 44300 Nantes
- 44109 000 BT 641
- 44109 000 BT 655
Previous parcel: 44109 000 BT 225 – 40 Rue des Forges, 44300 NantesNext parcel: 44109 000 BT 227 – 44 Rue des Forges, 44300 Nantes