Car Insurance Guide

How to insure a modified car and keep cover valid

Written by Chloe Adams Managing Editor Reviewed by Nomsa Dlamini RE5 qualified · 12 years in short-term insurance Updated 28 July 2026 Our editorial standards →

How do I insure a modified car in South Africa?

To insure a modified car properly, you must declare every modification and, ideally, agree a value that reflects the money you have put in. Standard cover values a car at its book price, which ignores modifications and can leave you underpaid after a claim. Undeclared mods can void a claim entirely. Look for insurers that accept modifications and offer agreed or specified value, and keep records and receipts to support your cover.

Key takeaways

Every modification must be declared - undeclared mods can void a claim.
Standard book value ignores your modifications, risking an underpayment.
Agreed or specified value cover reflects what you have actually invested.
Performance and appearance mods can affect both risk and premium.
Keep receipts and photos so your modifications can be valued at claim time.

Why modifications change your insurance

A modified car is no longer the standard vehicle the insurer's book value assumes. Changes to performance, appearance, wheels, suspension or sound systems alter both the car's value and, sometimes, its risk. Performance upgrades can increase the chance or severity of a claim, while desirable modifications can make a car a bigger theft target. Insurers need to know about all of this to price and cover the car correctly. Treating a modified car like a standard one is the root of most modified-car claim problems, so the fix starts with full disclosure.

Declare every modification

Disclosure is non-negotiable with a modified car:

List factory-optional and aftermarket changes alike - engine, exhaust, suspension, wheels, body kits and interior.
Include performance tuning and remaps, which can materially affect risk.
Declare cosmetic and audio modifications that add value.

If a modification is not declared and it is relevant to a claim, the insurer may reduce the payout or reject the claim outright. It can feel tedious, but a complete, accurate list is exactly what protects the money and effort you have put into the car.

Agreed value versus market value

The way your car is valued is critical. Most policies default to market or retail value based on a standard model, which ignores your modifications - so a written-off, heavily-modified car might be paid out as if it were stock. Agreed or specified value lets you and the insurer settle on a figure upfront that reflects the modifications, usually supported by documentation or a valuation. For a car with significant modifications, agreed value is often the only way to avoid a serious shortfall after a total loss, so it is worth seeking insurers that offer it.

Finding an insurer that accepts mods

Not every insurer is comfortable with modified cars, and some price them steeply or decline certain modifications. Specialist and enthusiast-friendly insurers, and brokers who understand modified and performance cars, are usually the better route. They are more likely to offer agreed value, understand what your modifications are worth, and cover them properly. Because appetite and pricing vary so much, a modified car is a case where shopping around and, often, using a broker makes a real difference to both the cover you get and the price you pay.

Keeping records and comparing cover

Good records underpin modified-car cover. Keep receipts, invoices, photographs and any professional valuation for your modifications, so their value can be proven at claim time. Update the policy whenever you add or change something. When comparing, look at whether modifications are accepted, whether agreed value is available, and how the excess and premium reflect the risk. Once your documentation is in order, compare quotes from insurers that genuinely cover modified cars rather than forcing yours into a standard mould.

Frequently asked questions

Do I have to declare modifications to my insurer?

Yes. Every modification, from performance tuning to wheels, body kits and audio, should be declared. If an undeclared modification is relevant to a claim, the insurer can reduce the payout or reject it entirely. A complete, accurate list is what keeps your cover valid and protects your investment.

What is agreed value cover?

Agreed or specified value is a figure you and the insurer settle on upfront, reflecting your car's modifications rather than a standard book value. For a modified car it helps avoid an underpayment after a write-off, since market value alone would ignore the money you have invested in the vehicle.

Will modifications increase my premium?

They can. Performance modifications may raise risk, and desirable mods can make a car a bigger theft target, both of which affect pricing. Some cosmetic changes have little effect. The key is declaring everything so the cover is accurate; the premium impact depends on the specific modifications.

Which insurers cover modified cars?

Appetite varies, and some mainstream insurers price modified cars steeply or decline certain changes. Specialist or enthusiast-friendly insurers and brokers who understand performance and modified cars are usually a better route, as they are more likely to offer agreed value and cover your modifications properly.

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