# Do motorbike modifications affect insurance?

> Quick answer · Last updated 5 July 2026

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## In short

Yes — exhaust, fairing and performance mods must be declared. Undeclared modifications can void claims.

Classic bikes may need agreed valuations.

Revert to standard before quoting if mods are temporary.

Insurers may refuse heavily modified machines.

See motorbike insurance guide.

## Related

- [Motorbike insurance guide](https://moneyguide.org.uk/insurance/motorbike-insurance-explained/)

## Primary source

abi.org.uk/motor

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Independent UK money guidance from [Money Guide](https://moneyguide.org.uk). Information only — not regulated financial advice.