A modification can change how an insurer assesses the car, even if the driver considers it cosmetic. Engine tuning, suspension changes, non-standard wheels, exhaust work, body kits, window tint, a towbar or a permanent electrical installation may affect risk, value or repair cost. The policy wording and insurer’s definition decide what must be declared; do not guess that a change is too small to matter.
Tell the insurer before the work is done where possible. Provide the make and specification of the part, who will fit it, whether it changes performance and whether the car’s original parts will be retained. Ask for written confirmation of the insurer’s decision and any premium or policy change. If the modification is already fitted, disclose it at renewal and contact the insurer rather than waiting for a claim.
The CCPC warns that incorrect or incomplete information can affect cover and that failing to disclose relevant details may lead to cancellation or difficulty getting insurance later. A declared modification may increase the premium, be excluded, or be declined by one insurer while another accepts it. Compare the revised policy, not just the price. Keep invoices, certificates and photographs so the insurer can identify what changed and when.
The same principle applies when buying a modified used car. Ask the seller for a list of changes and evidence of professional fitting. Then disclose the exact details to your insurer before driving away. A roadworthiness test or a clean history report does not confirm that an insurer has accepted the modifications.
