The chassis number of a mobile home contains, in a few engraved or stamped characters on the metal, information that neither the exterior nor the interior layout reveals at first glance. Among these, the year of manufacture remains the most sought-after data, whether for resale, insurance subscription, or compliance at a campsite. Locating this number, reading it correctly, and extracting the production date requires knowledge of the conventions used by French manufacturers.
Identification plate and chassis: two locations, two logics
The most common confusion lies in the difference between the identification plate fixed to the structure and the number stamped directly into the metal of the chassis. The plate, usually riveted near the main entrance or inside a technical closet, includes several mentions: manufacturer, model, serial number, weight, dimensions. The number engraved on the chassis, on the other hand, is located under the structure, often on the front part of the main beam.
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These two sources do not always provide the same readability. The plate can deteriorate over time, especially on models exposed to coastal humidity. The number stamped on the chassis is more resistant, but accessing it requires sliding under the mobile home. To reconstruct the year of manufacture, it is recommended to cross-reference the two, following the procedure to verify mobile home chassis number adapted to your brand.
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Decoding the serial number of a mobile home: manufacturer-specific formats
There is no universal format for mobile home serial numbers in France. Each manufacturer applies its own convention, complicating matters when purchasing a second-hand model without original documentation.
The month/year format introduced since 2023
Since 2023, several major French manufacturers, including IRM, O’Hara, and Résidences Trigano, have added a distinct code in the MM/AA or MM/YYYY format directly on the plate or chassis. This code is read without any special decryption: 03/2024 means March 2024. This evolution significantly simplifies identification for both buyers and park managers.
For models prior to this date, the year of manufacture remains integrated into the serial number according to a logic specific to each brand. In some manufacturers, the last two digits of the number correspond to the year. In others, the year is coded in the middle of the sequence. Without the manufacturer’s reading grid, interpretation remains uncertain.
What the number does not say
The chassis number indicates the date of manufacture, not the date of first use on a campsite. A mobile home may have been stored for several months, or even over a year, between leaving the factory and being installed. This distinction matters for assessing residual value and calculating the allowed duration of occupancy in certain parks.
Standard NF EN 1647: what the late 2022 revision changed
Since the end of 2022, the application guide for the NF EN 1647 standard, revised by AFNOR, requires new leisure mobile homes to have durable marking indicating at least the year of manufacture and the identification of the manufacturer. This marking must appear on the chassis or the identification plate.
This obligation applies to new models marketed after the revision. Older mobile homes are not retroactively subject to this requirement. However, during a plot transfer or a compliance check by the campsite manager, the absence of readable marking on a recent model can pose a problem.
The standard does not prescribe a unique numbering format. It sets a minimum of mandatory information, leaving manufacturers the choice of encoding. This is why two mobile homes from different brands may display chassis numbers of very variable length and structure.
Illegible or missing plate: what concrete remedies exist
On models dating from the 1980s or 1990s, the identification plate is sometimes torn off, corroded, or covered by renovation work. The number stamped on the chassis can also become difficult to read after several decades of exposure.
Several avenues allow for retrieving the information:
- Contact the manufacturer with partial elements of the serial number, the model, and any residual documentation (purchase invoice, transfer contract, old plot rental contract). The after-sales services of IRM, O’Hara, or Trigano have databases that sometimes go back several decades.
- Request a control organization such as Bureau Veritas or Socotec, which can partially reconstruct the identification by cross-referencing observable technical elements with manufacturer references. This approach is sometimes required by park managers to validate the compliance of a mobile home whose plate has disappeared.
- Check the administrative documents related to the plot: the rental contract for the location often mentions the serial number and year of the mobile home, even if this information has disappeared from the physical structure.
Buying second-hand: why the year of manufacture conditions everything else
The year of manufacture directly determines the market value, but also the very possibility of placing the mobile home in a campsite. Many parks refuse models beyond a certain age, often set by the internal regulations. A mobile home whose year cannot be certified risks being refused for installation.
In a transaction between individuals, the absence of a verifiable chassis number also complicates obtaining insurance. Companies require this number to establish the policy, as regularly reported by owners facing old models without documentation.
For a reliable assessment before purchase, cross-referencing the chassis number with the seller’s documents (original invoice, manufacturer certificate) remains the safest method. Field feedback varies on the reliability of estimates based solely on visual appearance or interior equipment, which may have been replaced or modernized without relation to the actual year of construction.
The chassis number remains the only objective and traceable element to establish the year of manufacture of a mobile home. With the generalization of the month/year format among major French manufacturers and the strengthening of the requirements of the NF EN 1647 standard, recent models are easier to date. For older models, the process requires method and sometimes the intervention of a third-party organization capable of cross-referencing technical data with manufacturer archives.