There’s a cause automobile producers make vehicles the way in which they do: they need every mannequin to enchantment to the widest potential viewers. However many automobile lovers are eager to drive a automobile that’s modified to suit their explicit set of preferences, whether or not these modifications be visible or performance-related.
What counts as a automobile modification for insurance coverage?
The definition of a ‘modified’ car, so far as insurance coverage is anxious, is any alteration to a car’s manufacturing unit customary, i.e. something that wasn’t within the producer’s customary specification upon creation, or wasn’t fitted as an possibility through the manufacturing stage.
This isn’t restricted to mechanical adjustments like becoming a brand new engine. Beauty alterations like physique kits, spoilers, alloy wheels or perhaps a bumper sticker are thought-about modifications, in addition to technical mods like parking sensors. And each modification you make to your automobile comes with a compromise.
Whereas some well-liked automobile modifications can cut back your insurance coverage premiums, others improve them. Right here, we check out a few of the hottest automobile mods – together with their legality and their influence in your automobile insurance coverage.
Leap to:
Popular modifications that may increase your insurance premium
Popular modifications that may reduce your insurance premium
Car mods that probably won’t affect your insurance
Do I’ve to inform my insurance coverage firm if I modify my automobile?
UK legislation specifies that in case your automobile has been modified, you need to declare the adjustments to your insurer, even if you happen to didn’t make the adjustments your self. If you happen to don’t, your insurance coverage could possibly be invalidated.
In addition to declaring any recognized modifications whenever you buy your car, it’s necessary to replace your insurance coverage firm as and whenever you make extra adjustments to make sure you stay lined. Ideally, contact your insurer prior to creating any modifications so as to verify any adjustments to your coverage that will happen.
Because the policyholder, the accountability is on you to declare all modifications. If you happen to’re shopping for a automobile second-hand and are in any doubt of labor that will have been carried out, get the automobile checked by a mechanic.
What occurs if I don’t declare modifications on my automobile insurance coverage?
If you happen to don’t declare the modifications – no matter whether or not the omission was intentional – and also you’re caught with undeclared mods, your declare could also be refused and your insurance coverage will probably be void.
You probably have insurance coverage refused or cancelled, you can find it tougher and costlier to get cowl sooner or later. So, if you happen to’re in any doubt, double-check and declare.
Relying on the modifications you intend to make, chances are you’ll require a specialist coverage, as not all insurers will cowl modified automobiles. You may additionally discover {that a} specialist modified insurance coverage coverage will prevent cash, so it’s value getting quotes, even when your present supplier will cowl you.
Modifications that will improve your insurance coverage premium
Engine upgrades

Modifications to your automobile’s engine and different car mechanics, such because the exhaust system, transmission and air filter, can improve your car’s efficiency. In 70-80% of circumstances the place a automobile’s engine dimension is elevated, insurance coverage premiums improve too.
Engine management unit (ECU) remapping
The set up of an engine management unit (ECU) is an effective instance of an engine modification that may push your insurance coverage premiums up. All vehicles are arrange on the level of manufacture to manage the fuel-air combination within the engine, which maximises effectivity and energy. Many producers programme the ECU’s parameters far beneath the automobile’s functionality. Reprogramming, or ‘remapping’, this will enhance engine efficiency and, in some cases, return higher mileage.
Including or changing the ECU’s chip to make the automobile extra economical will improve the brake drive of the car barely. This may occasionally improve your premium, however solely as much as about 5%.
Nonetheless, remapping the ECU to get considerably larger efficiency out of your engine may price extra. As a common rule of thumb, the share improve to your premium will probably be about the identical as the share improve in horsepower.
Discover out if insurers can inform in case your automobile is remapped right here.
Chilly air consumption – filter modification
The set up of a chilly air consumption not solely frees up the air circulate to your engine, it additionally feeds it cooler, extra condensed air. Cooler air is denser, bringing extra oxygen into the combustion chamber and giving your engine extra energy because of this. This modification might solely have a small influence in your premium, and received’t improve it as a lot as absolutely remapping your engine.
Exhaust upgrades

Many drivers relieve stress on the engine – and return somewhat bump in horsepower – by enhancing the exhaust system, which aids waste flowing by way of the engine. This normally includes making the exhaust larger and louder, and should improve your premium.
Be aware that many ‘massive bore’ exhausts are unlawful, as a result of quantity of noise they make – normally as a result of the exhaust silencers have been eliminated. UK legislation states that it’s unlawful to switch an exhaust system in a means that makes your car noisier, and the police can take motion in case your silencer is lacking or doesn’t work. In case your exhaust system is illegitimate, you may face an on-the-spot positive and your automobile could also be taken off the street till it’s returned to authorized requirements. And, in fact, unlawful additions to your automobile will invalidate your insurance coverage coverage.
Bodywork modifications

Physique kits are sometimes added onto present bodywork, or change present bodywork, ensuing within the security of the automobile being compromised. Modifications like this embrace including an even bigger bumper to make the automobile look distinctive or sporty. Whereas bumpers are made with security in thoughts, physique kits are usually not essentially made to fulfill the protection requirements required – generally crumbling underneath the tiniest influence.
Mods reminiscent of entrance and aspect skirts imply much less floor clearance, which may be hazardous on uneven roads. Most physique kits are typically fabricated from fibreglass or polyurethane, making them extra more likely to splinter within the occasion of a crash.
Normally, you probably have a regular coverage, bodywork adjustments can improve your premium by 10-15%. Nonetheless, if you have already got a modified insurance coverage coverage, a physique package is unlikely to have an effect on your premium except it dramatically will increase the worth of your automobile.
The next beauty modifications can have an effect on your automobile insurance coverage in comparable methods:
- Flared wings
- Wheel arches
- Spoilers
- Valances
A preferred physique package modification for Toyota MR2 homeowners is to rework their vehicles into Ferrari replicas. In circumstances reminiscent of these, the kind of insurance coverage coverage you’re underneath might change. It’s at all times finest to examine along with your insurance coverage firm earlier than doing any work.
Gear quick shift kits

Quick shift kits are a well-liked modification that shorten the space the lever must journey between gears. This implies faster shifts and sportier motion – it could additionally make your automobile harder to drive if you happen to’re not used to it!
As this modification is related to younger drivers and racing, it may be a priority for some insurers. That stated, it is going to solely improve your premium about 5-10% or perhaps under no circumstances in case your automobile is already closely modified.
Customized interiors and exteriors
These modifications normally discuss with exterior and inside automobile mods that replicate your persona. How they influence your premium will depend on numerous elements, together with the claims historical past of those modifications in your space.
Reupholstering or changing seats
Changing or reupholstering your seats could also be crucial relying on the age and put on of your automobile – otherwise you may simply determine you wish to set up heated seats or vintage-style tuck and rolls. Regardless of the cause, ensure you point out the modification to your insurer.
Putting in new seats or reupholstering your present ones may improve a regular coverage by 5-10%. If you have already got a modified automobile insurance coverage coverage although, it’s extremely unlikely new seats will incur any extra prices.
Customized paint jobs
Not the entire well-liked modifications you may make to your automobile’s exterior are authorized. Exterior mods embrace, however are usually not restricted to:
- Tinted home windows
- Below-car neon lights
- Customized LED headlights
- Customized paint jobs
- Stickers and decals
- Including a tow bar
Many individuals are stunned to listen to that customized paint or wrapping jobs, decals and stickers are additionally classed as a modification by insurance coverage corporations. As such, some folks get caught out after they attempt to make a declare and uncover their insurance coverage isn’t legitimate as a result of they haven’t declared their bumper sticker assortment or racing stripes.
Not all insurance coverage corporations cowl stickers and customized paint jobs – it will depend on claims they’ve had up to now. If the corporate has needed to make giant pay-outs for vehicles with these sorts of modifications, they might not be eager to cowl them for different drivers. For insurers that do supply cowl, they’re solely more likely to improve your premium by 5% at most.
Alloy wheels

Alloy wheels are a lot stronger but lighter than metal ones of the identical dimension and may subsequently enhance automobile dealing with. It is because there will probably be much less weight for the suspension to deal with and fewer resistance whenever you steer. Alloys are sometimes ordered on the level of buy for brand new vehicles, however they’ll additionally simply be an aftermarket modification.
If there’s a historical past of alloy wheel theft within the space the place you reside, your insurer might improve your premium.
Modifications that will cut back your insurance coverage premium

Engine downsizing
Many small engines are extremely vitality environment friendly, as they run on fewer cylinders and make the automobile lighter. For that reason, automobile producers are choosing smaller engines in new vehicles. For present vehicles, some folks select to swap their engine for a smaller one with the identical energy – successfully getting the identical efficiency however utilizing much less vitality. Simply as growing engine dimension can improve your premium, downgrading to a smaller engine can lower your premium.
Excessive-performance brakes

In case your automobile has been fitted with up to date brakes, its behaviour on the street will probably be altered. Sports activities drivers, for instance, will set up high-temperature brake pads and fluid to get shorter, extra constant stops out of their brakes.
It’s potential to put in high-performance brakes into sure non-sports vehicles. In case your automobile is already closely modified, an improved braking system might cut back your premium as a lot as 10-15%.
Nonetheless, most vehicles are manufacturing unit fitted with appropriate brakes already. In case your automobile isn’t modified, or solely has just a few modifications like alloy wheels or suspension, your premium is unlikely to be affected.
Suspension upgrades
Upgrading your automobile’s suspension might make a noticeable distinction to its dealing with, however most vehicles have satisfactory suspension as customary. As such, you’re unlikely to see a change in the price of your coverage, except your automobile is already closely modified – wherein case, chances are you’ll save about 5%.
Sway bars
When a automobile turns or swerves, the impact of the load switch onto one aspect can, over time, negatively influence dealing with. That is why some drivers set up sway bars – also referred to as anti-roll or stabiliser bars – which assist to scale back physique roll by connecting the precise and left wheels.
Quite than the automobile leaning to at least one aspect, the sway bar helps to distribute the drive equally – the bar goes down on the aspect it leans into, and up on the opposite aspect. It’s somewhat additional that may prevent about 5% you probably have a extremely modified automobile.
Automotive mods that most likely received’t have an effect on your insurance coverage
When you should notify your insurance coverage supplier of any a part of your automobile that’s not manufacturing unit customary, many modifications are unlikely to extend or lower your insurance coverage premium. We now have a few of these beneath.
Water cooling programs (brakes)
One other modification that improves brake efficiency is a water cooling system. For instance, some vehicles have misting programs added to their brake ducts to maintain them from overheating. These are unlikely to have an effect on your insurance coverage premiums.
Inside modifications

Sound programs
Sound programs are a well-liked (and pretty low-cost) mod. Most individuals can have seen – or extra doubtless heard – a automobile with an aftermarket subwoofer. This can be a speaker system designed to maximise low frequencies reminiscent of bass and sub-bass. Except you go for a high-value system, you received’t see an increase in your premium.
Dashboard add-ons and upgrades

You might modify your dashboard for purposeful causes or for aesthetics, reminiscent of switching to wooden panelling. Both means, it’s unlikely to have an effect on your premium.
Customized gear knobs
Gear knobs will also be modified. Some drivers will select to switch their present one as a result of it’s worn, or they’d favor one thing extra ergonomic or aesthetically pleasing (e.g. leather-based, sparkly). Novelty choices embrace skulls, gaming joysticks and movie prop replicas.
They might have an effect on your capacity to vary gear, however they most likely received’t have an effect on your insurance coverage prices.
Exterior modifications

Novelty hub caps
Some automobile homeowners select to make their mark on a automobile by customising their wheels, for instance by including spinning hub caps or light-up hub caps. Whereas these is usually a theft threat and you need to notify your insurance coverage supplier, wheel modifications which are unrelated to efficiency are unlikely to have an effect on your premium.
Do tinted home windows have an effect on insurance coverage?
Tinted home windows received’t improve or lower your insurance coverage cowl, offered you make sure that they’re authorized.
Whereas UK law states that there are not any restrictions on tinting your rear home windows and windscreen, the entrance windscreen and side-view home windows do have restrictions. Legally, a minimum of 75% of sunshine should be allowed by way of the entrance windscreen and 70% of sunshine by way of the entrance aspect home windows.
That being stated, you need to nonetheless notify your insurer if you happen to determine to tint your home windows.
Is a tow bar classed as a modification?
Tow bars are classed as a modification as a result of they differ from the producer’s manufacturing unit specification, so you need to let your insurer know if you’re becoming a tow bar to your automobile. That stated, the addition of a tow bar is unlikely to extend or lower your insurance coverage premium.
Do wind deflectors have an effect on insurance coverage?
Wind deflectors are normally a producer’s accent and it’s unlikely that your insurer would elevate your premiums on account of becoming them. That stated, they’re a bodywork modification, so your insurer ought to nonetheless be notified if wind deflectors are being added.
Customized lights

Are headlight modifications authorized?
Customized headlights are sometimes unlawful. By legislation, solely white lights may be fitted on the entrance of your automobile, and crimson lights on the rear. Colored LEDs are usually not allowed and will get you an on-the-spot positive, invalidate your insurance coverage coverage and go away your automobile off the street till it’s declared street authorized once more. This consists of washer jet LEDs, that are prohibited.
What about under-car neon lights?
Below-car neon lights are a favoured modification. These may be fitted legally however by legislation, you aren’t allowed to have the tubing seen and the sunshine can’t be so brilliant that it’ll distract you or different street customers. For instance, flashing under-car lights are unlawful.
Normally, lights received’t improve your price of insurance coverage. However your insurer might take into consideration your claims historical past and theft threat, particularly if you happen to’re a youthful driver.
Suspension modifications

Decreasing your suspension
A automobile’s suspension can legally be lowered so long as this doesn’t have an effect on the steering or headlight purpose. There are strict specs round headlight purpose, as adjustments affecting headlights have the potential to dazzle different drivers.
One other problem confronted with decreasing a automobile is its capacity to clear uneven street surfaces reminiscent of velocity bumps. Over-lowering can even cut back the effectiveness of the automobile’s dealing with, placing the motive force and passengers in danger. Nonetheless, this modification is principally beauty and unlikely to have an effect on your premium.
Changing bushings
Bushings are small rubber or polyurethane suspension parts which are used to isolate vibration, present cushioning and cut back friction between steel elements. Some drivers with rubber bushings change them with polyurethane bushings, as these usually last more and do a greater job of quelling vibrations and minimising weight switch.
These received’t have an effect on your insurance coverage coverage, however as with all modifications, you need to nonetheless declare them.
Racing parts

Observe days grew to become significantly well-liked within the Nineteen Nineties after the introduction of velocity cameras on Britain’s roads. As such, folks began to switch their vehicles for the observe by including roll cages and roll bars. These are frames constructed into the automobile to guard the motive force and/or passenger within the occasion of an accident.
It’s unlikely you’ll discover an insurance coverage firm that may cowl these underneath customary insurance policies – chances are you’ll want to think about a modified automobile insurance coverage coverage from a specialist insurer.
Different methods to scale back your modified automobile insurance coverage premiums
Utilizing safety units, reminiscent of immobilisers, monitoring units and extra security locks, helps to discourage theft, and these are all methods to probably cut back your premium.
In case your automobile is a 1995 mannequin or earlier, including an immobiliser can get rid of your theft threat and subsequently cut back your premium. Putting in a tracker to a closely modified automobile (£40,000 worth or above) can even cut back the price of cowl for that car.
Your premium with a specialist insurance coverage supplier is more likely to be lowered by about 15% you probably have purchased a automobile and modified it your self or had a mechanic modify it to your specs.
It is because the insurance coverage firm recognises that you’ve got put time, vitality and care into your automobile, and are much less more likely to deal with it with disrespect or drive recklessly. The truth is, some insurers will cut back your premium the extra modifications you make!
Get tailor-made modified automobile insurance coverage from Adrian Flux
If you happen to’re in want of modified automobile insurance coverage, you may get a quote from an insurance coverage dealer like us.
We’re specialists in modified car insurance, evaluate quotes from 30 insurers and guarantee we all know the precise modifications made to your car so we will tailor your coverage to your wants.
Name us on 0800 369 8590 for a quote, or ebook a callback at a time that fits you.

