Both routes show that the vehicle meets the applicable regulations; the difference lies in what the approval covers. Series Modification Approval covers the same change applied to a group of vehicles, and Individual Approval covers a single vehicle.
When series modification fits
If the same work will be applied repeatedly to the same vehicle type, series modification is the right route. LPG or CNG conversions, panel van to passenger conversions and fitting standard equipment to a fleet are examples. The file is prepared once, later vehicles fall under the same approval, and the cost per vehicle drops.
This route requires showing that the modification is repeatable: the work description, the parts used and the checks must be the same on every vehicle.
When individual approval fits
Individual Approval fits a single imported vehicle, a unique conversion or a one-off modification. The assessment is based on the vehicle's own characteristics. Existing approval documents and tests are taken into account, and any gaps are closed with further review or testing where needed.
Three questions for choosing
Will the same work be applied to other vehicles? Will the vehicle type and equipment stay the same each time? Are the vehicle's existing approval documents available? If the first two answers are yes, series modification is the better start; if the vehicle is unique or its configuration is one-off, Individual Approval is.
The change itself decides which regulations apply. Engine and fuel system work raises emission and safety subjects; adding seats raises anchorage and safety-belt subjects; lighting changes raise R-48 checks.
This article is a summary for orientation. For legal requirements, always refer to the official text in force and its amendments.
