Why Compare Modified Car Insurance?
Mod Pricing Varies Widely
The same remap or body kit can price very differently across UK insurance providers. Compare several insurance providers in one short form to see the spread on your specific modifications.
Honest Declarations Protected
Every modification beyond factory spec must be declared under CIDRA 2012. Compare insurance providers that price your declared mods clearly rather than reject the risk at quote stage.
Some Mods Barely Move Price
Cosmetic tints, badges and floor mats rarely affect rating, while remaps and lowered suspension often do. Compare insurance providers that price each modification on its own merits.
Modified Car Insurance At A Glance
- Same Product, Different Rating - it's the same legal car insurance product, simply rated for a non-factory specification.
- Every Mod Must Be Declared - engine, body, suspension, exhaust, alloys and ICE upgrades all need declaring at quote stage.
- CIDRA 2012 Sets The Duty - undeclared mods are a misrepresentation and a related claim may be refused.
- Photos Smooth The Process - clear pictures of installed modifications help providers price the risk accurately.
- Compare Quotes - see UK insurance providers priced for declared modifications.
Is It Different From Standard Cover?
It's the same legal car insurance product, but every modification beyond factory spec needs declaring honestly to keep the cover good:
- Performance Mods Matter Most - engine remaps, performance exhausts and lowered suspension typically shift the rating band
- Cosmetic Mods Often Don't - tints, decals and badge swaps usually have little or no pricing impact
- CIDRA 2012 Applies - the duty not to misrepresent material facts covers every modification, factory-fit or aftermarket
- Aftermarket Alloys Count - non-standard wheel and tyre sizes are a declarable modification, not a free upgrade
Cover Levels Explained
Pick third party only and a fire that destroys your modified Golf could leave you without a payout. Here's what each level includes.
| Feature | Comprehensive | Third Party, Fire & Theft | Third Party Only |
|---|---|---|---|
| Liability to third parties (legal minimum) | Yes | Yes | Yes |
| Fire and theft of your vehicle | Yes | Yes | No |
| Accidental damage to your own car | Yes | No | No |
| Declared modifications covered as standard | Often included | Provider-dependent | No |
| Theft of aftermarket alloys and tyres | Typically yes | Typically yes | No |
| ICE and in-car entertainment cover | Often included | Provider-dependent | No |
| Like-for-like modified parts on claim | Add-on or provider-dependent | Add-on | No |
| Courtesy car while yours is repaired | Often included | Add-on | Add-on |
| EU driving (third-party level) | Yes | Yes | Yes |
| Uninsured driver promise (no excess if not at fault) | Often included | Provider-dependent | No |
Please note that policy features, benefits, terms and conditions vary among insurance providers, so always check the policy wording.
Cover Tip: Every modification beyond factory spec must be declared at quote stage - engine remap, body kit, suspension lowering, performance exhaust, aftermarket alloys, ICE upgrades. Undeclared modifications are a misrepresentation under CIDRA 2012 (the duty not to misrepresent material facts), and a claim involving a related event may be refused. Photographs of installed mods help when declaring.
What May Not Be Covered
A single exclusion can turn a stolen alloy into an unpaid loss. Here's what your policy typically doesn't cover.
Standard Exclusions
- Undeclared Modifications - Any modification beyond factory spec that hasn't been declared may invalidate cover under CIDRA 2012. Declare every change at quote stage and at renewal.
- Wear and Tear or Mechanical Failure - Routine ageing of parts, mechanical breakdown and gradual deterioration are not insured events under a standard motor policy.
- Undeclared Use Type - Using the car for business, hire or reward without declaring it may invalidate cover. Social and domestic use alone is not enough.
Important Limitations
- Track Days and Competitive Driving - Use on a racing circuit, time trial or competitive event is excluded under standard policies and requires specialist track day cover instead.
- Modifications Without Engineering Certificate - Structural changes that affect vehicle classification may need engineering sign-off. Some providers decline cover without supporting paperwork.
- Driver Not Named on the Policy - Lending a modified car to a friend who isn't a named driver typically leaves the policy with no cover at the point of incident. Add any regular drivers in advance.
Important: These are not exhaustive exclusions - every insurance provider sets its own terms, limits and conditions. Always check the full policy wording for the complete list of what is and is not covered.
Extras Worth Considering
Skip cover for declared mods and a stolen body kit could leave you several thousand out of pocket. These optional extras could be worth adding.
An upgrade that replaces declared modifications with equivalent aftermarket parts on a claim, rather than factory-spec OEM. Useful for heavily-modified cars where stock replacement would change the build.
Locks in a pre-agreed market value rather than a depreciated settlement on a total loss claim. Often useful for restored or extensively-modified vehicles.
Roadside assistance, recovery and home start. Modified cars sometimes need specialist transport, so check whether the breakdown product covers lowered or wide-bodied vehicles.
Protecting your discount lets you keep your built-up no-claims record after a set number of fault claims, although the headline premium can still rise at renewal.
What Affects The Cost?
Engine remaps, body kits and performance upgrades all push a premium higher. Here are the factors that shape a modified car quote.
| Key Factor | Impact on Your Price |
|---|---|
| Performance modifications declared | Engine remaps, performance exhausts and induction kits typically shift the rating band, sometimes meaningfully. |
| Body modifications declared | Body kits, wide-arch conversions and full resprays can affect repair cost, which feeds through into the quote. |
| Suspension and brake modifications | Lowered suspension and uprated brake kits often move the rating, especially when paired with performance upgrades. |
| Aftermarket alloys and tyre sizes | Non-standard wheels and tyre profiles are declarable, and replacement cost may sit above factory parts. |
| ICE and lighting upgrades | Aftermarket head units, amplifiers and lighting are declarable modifications and can affect parts cost on a claim. |
| Vehicle insurance group | Modified versions of higher-group cars (Golf R, Civic Type-R, Impreza WRX) tend to price above their stock equivalents. |
| Driver age and no-claims years | A young driver with a heavily-modified car often sees larger price spreads between providers than an experienced driver. |
| Home postcode and overnight storage | Driveway or garage parking typically prices lower than on-road parking, particularly for theft-attractive modified cars. |
| Annual mileage | Lower declared mileage on a weekend-use modified car may help reduce the quote when declared accurately. |
| Cover tier chosen | Comprehensive often prices similarly to third-party fire and theft on modified cars, so always compare all three tiers. |
The quotes you get will depend on your declared modifications and driver profile.
Price Insight: The ABI Motor Premium Tracker put the average UK motor premium at £560 in Q1 2026 (as at March 2026). Modified cars typically sit above that average, with the spread between providers often widening as the modification list grows - which is why comparing several insurance providers on the same declared mod list tends to be worth the few extra minutes.
Ways To Cut Your Premium
Renew on autopilot with an undeclared remap and your cover could be sitting on a defect. Here are practical ways to cut what you pay.
Declare Every Modification Upfront
Listing all modifications at quote stage helps providers price the real risk and protects your cover. Hidden mods are the most common reason a claim is reduced or refused.
Park Off-Road Where You Can
A driveway or garage typically prices lower than on-road parking, especially for theft-attractive cars like a modified Civic Type-R or Impreza WRX.
Photograph Installed Mods
Clear photographs of installed modifications support accurate underwriting at quote stage and back up a future claim if there's any question about parts.
Limit Annual Mileage Honestly
Many modified cars are weekend or show-use rather than daily drivers. Declaring lower annual mileage accurately may help reduce the quote.
Add An Experienced Named Driver
Adding an older driver with a clean licence as a named driver may help bring the average risk score down on a young owner's policy. A shared family car may also fit a multi-driver setup.
Compare Quotes At Every Renewal
Modified car pricing varies widely between providers, so compare cover and price each year before auto-renewing rather than letting the policy roll on.
Saving Tip: Some modifications materially affect rating (engine remap, suspension lowering, performance exhaust), and others typically don't (cosmetic tints, branded floor mats, badge changes). Comparing across UK insurance providers shows which insurance providers price specific modifications competitively - the variance between insurers on the same modification can be larger than the headline tier choice.
How To Compare Quotes
Comparing modified car insurance from UK insurance providers takes only a few minutes. Get started above.
Share Your Details
Enter car, driving history, annual mileage and the full modification list. The form takes a few minutes.
Declare Every Modification
List engine, body, suspension, exhaust, alloys and ICE upgrades. Photos at this stage help underwriting.
Compare Cover And Price
Check excess, modified parts cover, agreed value options and how each provider treats your specific build.
Choose And Buy
Pick the quote that fits your cover and budget. Complete the purchase directly with the provider.
Receive Your Documents
The provider issues your certificate and policy wording. Check the modification schedule matches what you declared.
What Our Expert Says
Owners of modified cars are sometimes surprised by how big the price spread is between providers on the same declared modification list. A Golf GTI with a Stage 1 remap and lowered suspension can attract very different quotes depending on which provider you ask, which makes comparing more useful here than on most standard cover.
A common pitfall is treating cosmetic and performance modifications as the same thing at quote stage. A vinyl wrap or a set of branded floor mats usually has little or no impact on the rating, while an engine remap or a performance exhaust often does. Declaring both honestly keeps the cover good either way, and lets the provider price the risk on its real shape.
The other one is photographs. Clear pictures of installed mods help providers price the risk accurately, and they also support a future claim if there's any question about whether a part was on the car. A few minutes with a phone camera at quote stage tends to save a lot of paperwork later. The GOV.UK vehicle tax classes page is also a good sense-check on whether structural changes affect a vehicle's classification.
Insurance Expert & Co-founder of Clean Green Cars
Common Questions
Do I Have To Declare Every Modification On My Car?
Yes. Under CIDRA 2012, every modification beyond factory spec is a material fact and must be declared at quote stage and at renewal. That covers engine remaps, body kits, suspension lowering, performance exhaust, aftermarket alloys and ICE upgrades. Undeclared modifications may lead to a reduced or refused claim.
Which Modifications Affect Insurance Most?
Engine remaps, performance exhausts, induction kits and lowered suspension typically shift the rating band the most. Aftermarket alloys, ICE upgrades and lighting changes are also declarable. Cosmetic mods like tints, decals and badge swaps usually have little or no impact on the quote.
Why Can Modified Car Insurance Cost More Than Standard?
Modified cars often carry higher repair costs, higher theft attractiveness and altered performance characteristics, all of which feed into the rating. Premiums for modified cars typically sit above the standard average, though the spread between providers can be wider than on stock vehicles.
Are Cosmetic Modifications Counted As Mods For Insurance?
Yes, in the sense that they're still declarable. Window tints, vinyl wraps, decals and badge changes count as modifications, although providers typically price them as minimal-impact rather than rating-shifting. Declaring them honestly keeps the cover good either way.
What Happens If I Don't Declare An Engine Remap?
An undeclared remap is a misrepresentation under CIDRA 2012, the duty not to misrepresent material facts. A claim involving a related event may be reduced or refused, and the insurer may treat the policy as if it had been priced on the true facts from the start.
Do I Need Specialist Cover For A Heavily-Modified Car?
Many mainstream UK insurance providers will quote on cars with declared modifications, particularly common upgrades like remaps and alloys. Heavily-modified or one-off builds sometimes need a specialist modified-car insurer, which is why comparing several insurance providers tends to surface the right fit.
Does An Engineering Certificate Help With Modified Car Cover?
For structural changes, yes. An engineering or certifying body report can support an accurate quote and a future claim, particularly on wide-arch conversions, chassis work or major drivetrain changes. Some providers will ask for paperwork before confirming cover.
What Happens After I Submit My Details?
Clean Green Cars introduces you to UK insurance providers who price for declared modifications. You'll see quotes within minutes and can compare cover, price and add-ons for your specific modified car before choosing.
Search & Compare Quotes From UK Modified Car Insurance Providers
Useful Resources
- GOV.UK - Vehicle Tax Classes - check whether structural modifications affect your vehicle's tax class.
- GOV.UK - Change Vehicle Details on the V5C - how to update engine, body colour and other vehicle details with DVLA.
- ABI - Motor Insurance Guide - industry guidance on how motor cover is structured and rated.
- legislation.gov.uk - Consumer Insurance (Disclosure and Representations) Act 2012 - the statute governing your duty not to misrepresent material facts at quote stage.
