UK insurance with modifications

Aug 11, 2025
9
3
Hey all,

Just wondering how much insurance has been affected with small modifications like splitters, side skirts, wing extender etc. Or is it even worth notifying the insurance about those bits?

Thanks!
 

tracktoy

Committed Cupra 280 Track enthusiast
Staff member
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Jun 11, 2023
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UK
As with all insurance depends on you, your location and in my experience the number of modifications.

Small number of external bits (splitters etc) normal run of the mill insurance companies are not overly worried about but you reach a point where you need to talk to specialist insurance companies (like adrian flux) and for me personally I have been very happy how little it has cost.

Always declare them because otherwise your are technically not insured in my view.
 
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Aug 11, 2025
9
3
Yeah I guess I would do a check to make sure they arent going to see them as performance upgrades and hike the price of the insurance up. Was just interested in other peoples experiences. Thanks!
 

Legojon

I only wanted a remap
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Jul 7, 2015
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I've found most insurances to be pretty good. Including the standard car insurers. I think most a remap has ever cost me is 30-40. If I recall, last time I phoned a standard insurer I tried to explain to them the splitter, diffuser, etc. They just added on "aftermarket bodykit" for 35 for the year.

I've always been nervous about having the mods and not delcaring them. Then after phoning the insurance, wondered why I didn't just do it in the first place.
 
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SRGTD

Active Member
May 26, 2014
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Yeah I guess I would do a check to make sure they arent going to see them as performance upgrades and hike the price of the insurance up. Was just interested in other peoples experiences. Thanks!

@chux27 - be aware that non performance upgrades might also result in premium increases - it depends on the insurance company’s approach to risk and whether or not they consider the proposed modifications increase the insurance risk. There isn’t a standard market approach to modifications by the insurance industry, so where one insurance company may require an increased premium another insurance company may not. I’ve fitted non-OEM alloys to my three previous cars; on two occasions, the insurance company I was with didn’t increase my premium but on the third occasion there was a modest premium increase.

With non performance cosmetic modifications, some insurance companies might consider cosmetic upgrades would make a car more of a target for theft as it might be more visually appealing to certain types of scumbags perpetrators who are looking for a ’free’ car 😠. Also, the addition of aftermarket bodywork such as side skirts, splitters and wing extenders can mean accident damage is more costly to repair - i.e. there’ll be additional costs involved in sourcing, painting and fitting the extra non-standard parts compared to the cost of repairing a standard factory spec car without cosmetic upgrades.

As @tracktoy has said, always declare any modifications; pretty much all car insurance policies will have a clause in the small print requiring you to do so and not declaring them could result in your insurance company voiding your policy.
 
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