Insurance and Mods: What You Must Declare in the UK

This is the least exciting article on this site and probably the most important one.

The rule in one line

Declare every modification, including cosmetic ones, including cheap ones.

Insurers define a modification as any change from manufacturer standard specification. That's broader than most people assume, and it doesn't care what the part cost.

What the law actually says

The Consumer Insurance (Disclosure and Representations) Act 2012 changed how this works, and mostly in consumers' favour.

You're required to take reasonable care not to make a misrepresentation when you take out or renew a policy. If something goes wrong, the outcome depends on why:

• Careless misrepresentation — the insurer applies a proportionate remedy. They might reduce the payout, or settle it as if you'd been charged the correct premium.
• Deliberate or reckless misrepresentation — they can void the policy entirely, refuse the claim, and in some circumstances keep the premium.

The practical difference is enormous. "I didn't think a spoiler counted" and "I knew and didn't say" land in completely different places.

The part that catches people out

A voided policy isn't just a refused claim. It means you were uninsured — which is itself an offence, and it follows you. Every future application asks whether you've had a policy voided or cancelled, and answering yes puts you in a much more expensive bracket for years.

You also remain personally liable for third-party damage. That's the number that can be genuinely life-changing.

Yes, these count

• Alloy wheels, including a different factory-optional size
• Suspension of any kind
• Exhaust changes
• Remaps
• Body kits, spoilers, splitters, wraps
• Tints
• Interior changes — seats, steering wheel, audio, hard-wired electronics
• Roof boxes, bars and towbars
• Uprated lighting
• Removed seats

Usually not

• Anything genuinely removable and not fixed to the car — loose mats, a suction phone mount, a boot organiser
• Manufacturer-fitted options that were on the car when new (though you should still make sure the insurer has the right trim level)
• Consumables and like-for-like replacements
• Warning triangles, first aid kits and similar

The line is roughly: fixed to the car or changes its specification = declare. Sits in the car and comes out in ten seconds = generally not.

If you're unsure, the answer is always to ask. It's a two-minute phone call.

Why a £30 part can move your premium

Insurers price on three things: theft risk, damage cost and driver profile. A cosmetic part can move all three — it can make the car more attractive to steal, more expensive to repair, and it flags you as a certain kind of owner.

That last factor is the honest reason cosmetic mods sometimes cost more than they seem to deserve.

How to declare well

• List everything at quote stage, not after. Retrofitting a declaration mid-policy sometimes triggers a re-rate you'd have avoided.
• Use specialist modified-car insurers. Mainstream comparison sites often price mods punitively or refuse them. Specialists price them normally.
• Keep receipts and photos. They set the value for a claim. Without proof, you'll be settled on standard spec.
• Update mid-term. Fitting something in month three and saying nothing until renewal leaves you exposed for nine months.
• Get confirmation in writing that the declared list is on file.

If a claim is refused and you think that's unfair, the Financial Ombudsman Service is free to use and has ruled against insurers on disclosure disputes many times.

The point isn't to build less. It's to build with cover that still works when you need it.

 

CARVRE - Say It Louder ⚡

General information only — confirm anything specific with your own insurer.