Modified Car Insurance (UK): Compare Quotes in Minutes

If your car has been modified, you'll usually need to declare those changes when arranging insurance. Modified car insurance is designed for vehicles that differ from the manufacturer's standard specification.

What counts as a modification, and how it affects cover, can vary between insurers, which is why comparing options is important.

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What you'll need to start a quote

✓Vehicle registration or make/model
✓List of declared modifications
✓UK postcode
✓Approx annual mileage

Who This Page Is For

This page is for UK drivers who:

own a car with declared modifications
have made performance, cosmetic, or functional changes
want to understand how insurers view modifications
need to compare cover options safely and accurately

What Counts as a Car Modification?

A modification is any change from the car's original factory specification. The Association of British Insurers advises that all changes should be disclosed to your insurer, even if you believe they are minor. Modifications may include:

alloy wheels or body kits
suspension changes
engine or exhaust modifications
cosmetic changes such as wraps or spoilers
interior upgrades
converting to electric or hybrid power (see our electric or hybrid car insurance guides)

Different insurers define modifications differently, so always declare changes clearly.

How Modifications Can Affect Insurance

Insurance pricing can be affected by:

the type of modification
whether it impacts performance or safety
how easy parts are to repair or replace
theft risk

Some modifications may increase premiums, while others may have little effect; it depends on the provider. According to the DVLA, any modification that changes the specification of your vehicle from its original factory build should be declared. Failure to notify your insurer of modifications can invalidate your policy entirely.

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Tips When Comparing Modified Car Insurance

1. Declare all modifications accurately

2. Compare multiple providers

3. Review cover limits and exclusions

4. Check excess levels carefully

5. Understand how modifications affect claims

If you're considering pay monthly options, check the total amount payable including any interest or fees. Having a good no claims bonus (NCB) may help when comparing modified car insurance options.

FAQs: Modified Car Insurance (UK)

Do I have to declare all modifications?

Yes. Failing to declare modifications can invalidate your cover entirely, meaning a claim could be rejected. You should tell your insurer about every change made to the vehicle, including cosmetic alterations, performance upgrades, and security additions. If you are unsure whether something counts as a modification, it is best to declare it and let the insurer decide.

Are all modifications accepted by insurers?

Not always. Some insurers specialise in modified vehicles, while others may decline to cover certain types of modification. Performance modifications such as engine remapping or turbo upgrades can be harder to insure than cosmetic changes like alloy wheels. Comparing quotes from multiple providers is the best way to find cover for your specific modifications.

Does a modification always increase insurance cost?

Not necessarily. Some modifications, such as improved security systems or parking sensors, may have a neutral or even positive effect on your premium. However, performance and cosmetic changes that increase the car's value or theft risk often lead to higher premiums. The impact depends on the insurer and the specific modification.

Can I pay monthly for modified car insurance?

Some providers offer monthly payment options for modified car insurance, but terms and availability vary. Keep in mind that paying monthly usually costs more overall due to interest charges on the credit agreement. Always check the total amount payable when comparing monthly and annual payment options.

What information do I need to compare quotes?

You will typically need your vehicle registration or make and model, a full list of declared modifications, your UK postcode, approximate annual mileage, and your driving history including any claims or convictions. Having this information ready before you start will help you get accurate quotes quickly.

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How We Created This Page (Transparency)

This page was created to explain how modified car insurance typically works in the UK and what drivers should consider when comparing options. It is reviewed for clarity and updated as needed.

Important Information

MySupermarketCompare is an insurance comparison website. We introduce customers to our quote partner to help them compare insurance options. Information on this page is general and is not financial advice.