Common modifications made to cars in the summer, such as adding a roof box or tinting windows, could end up invalidating your car insurance.

Failing to declare changes like these to your insurer could end up voiding your policy in some cases.

Therefore, if you need to make a claim in these circumstances, an insurer could refuse to pay out.

Greg Wilson, CEO and car insurance expert at Quotezone.co.uk said: “As the weather improves and motorists head off for summer trips, many make seasonal modifications, like adding a roof box or towbar, but failing to inform the insurer of these changes could invalidate the insurance and leave the driver unprotected.

“All the additions – towbars, roof boxes and racks, window tints, bicycle racks and adding a sunroof can all be seen as increasing the risk of an accident or the likelihood of damage, which is why it’s so important to notify the insurer."

What car modifications could invalidate your car insurance?

Roof box

Installing a roof rack or roof box when you’re travelling gives additional storage space for the journey.

However, it can be classed as a modification and failing to declare could void your cover if a claim is made.

Roof racks are not standard equipment and can impact the vehicle’s weight distribution and potentially its handling. Poorly secured or overloaded roof racks can also be dangerous.

Bicycle carrier

A bicycle carrier is also classified as a modification, as it can be seen as increasing the risk of accidents or damage to your vehicle

Window tints

Window tints do not automatically invalidate your insurance if they’re legal and your provider has been informed.

Premiums are unlikely to go up with this modification, but you must declare to your insurer, or you could invalidate your insurance policy.

Tow bars

Towing another item, whether that’s a caravan, trailer or other items, increases the risk of an accident happening. 

Therefore, adding a tow bar could be an issue if you don't let your provider know.

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It would also be helpful to check your policy covers the item you’re towing too.

Sunroof

Adding a sunroof when a car doesn't already have one is considered to be a modification.

It can alter the car’s value, repair costs and even its structural integrity.  Those added after purchase can also be prone to leaks.