Blog · Founder's View
Why modifying your car is a race to the bottom
Most modifications cost you twice: once to fit, and again every day you own the car.
Steve Queen, Founder · 28 August 2026 · 4 minute read
Sixteen years in this trade, and almost a million vehicles through our network since our records began in 2014, have taught me a pattern I would spare people if I could: the money spent personalising a car almost never comes back, and the car it was spent on usually leaves the road worth less than it should have been.
The short answer: modifications rarely add value and usually subtract it. They shrink the pool of people who would buy your car, they must all be declared to your insurer or your cover is at risk, and the discount they create stacks on top of normal depreciation. If you must modify, keep it reversible and keep the original parts.
Every modification is a bet on someone else's taste
A standard car can be sold to anyone. A modified one can be sold to the small fraction of buyers who share your taste and the moment your car needs a wider audience, at trade-in or on the forecourt, that narrowing has a price. Dealers do not debate it: a car altered from factory specification is harder to value, harder to warrant and harder to move on, so the offer drops. The body kit that cost four figures to fit is, to the next owner, a reason to negotiate downwards or walk away.
There are exceptions, documented safety and security upgrades, and period-correct work on classics but they are exceptions precisely because they widen appeal or reduce risk rather than express taste.
The timing of this piece is no accident. The '76 plate arrives on 1 September, thousands of new cars are being specified this month, and the options list is where the race to the bottom usually starts gently, and at full price.
Even the number plate is not exempt and it is the one modification that is not merely expensive but illegal. Alter the font, the spacing or the size of the characters and the law is specific: up to a £1,000 fine and an MOT failure. The lawful way to put personality on a plate is a cherished registration, which also happens to be the only personalisation on the whole car that can be kept when the vehicle goes.
The insurance trap most owners fall into
Undeclared modifications are not a grey area. The Financial Ombudsman Service has warned that growing numbers of drivers are being left with significant bills after unknowingly invalidating their cover, including a policy voided over an ECU remap and exhaust retuning the owner had failed to disclose. Two details catch people out. Every change from factory specification counts, down to tinted windows and stereo upgrades. And modifications made by a previous owner are still yours to declare, buying the car modified does not excuse you.
An invalidated policy does not just mean a refused claim. Driving without valid insurance is an offence, and the consequences run through fines and points to the vehicle being seized. A cosmetic tweak is a strange thing to risk that for.
The race to the bottom
Put the two together and the arithmetic turns grim. Every car depreciates. A modified car depreciates from a lower base, to a smaller market, with a premium-loaded insurance history and the cost of the modifications themselves sits on top, almost never recovered. Each element compounds the others. That is the race to the bottom: the owner has spent more than anyone else would have, on a car worth less than anyone else's.
From where we stand, the end of that road has a particular shape. When a repair bill meets a resale value, the owner does the maths and a modified car's reduced value tips that decision earlier than it needed to tip. The bottom of this particular race has an address, and it is ours.
Every modification is a bet that the next owner shares your taste, and most don't, the market prices that in on the day you fit it. If a car must carry your personality, put it in the registration. A plate can be retained. A body kit cannot.Steve Queen, Founder, Remove My Car
If you must modify
Three rules limit the damage. Keep it reversible, and keep every original part - a car returned to factory specification recovers most of its audience. Declare everything to your insurer before the work is done, not after. And if the aim is a car that stands out, spend on the things that hold or add value: condition, history, and a registration worth keeping, the one piece of personalisation that survives the car itself.
And before any big decision on an older car, know what it is actually worth - values differ more by make and model than most people expect.
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Journalists: Remove My Car has arranged the collection of almost one million vehicles since 2014 - more than 40,000 in the last year through a network of licensed Authorised Treatment Facilities, and holds over 17,000 verified customer reviews across Feefo and Trustpilot. Steve Queen is available for comment on modifications, vehicle values and end-of-life trends, [email protected] · 0330 159 1588. We aim to turn media requests around within two hours.
Joe Kendrick
Automotive Content Writer
About the Author
Joe is a seasoned content writer for Remove My Car with over a decade of experience in the industry. His passion for cars and commitment to sustainability have shaped his career, driving him to explore innovative trends and technologies within the sector. When he’s not behind the keyboard, Joe enjoys attending car shows, test-driving the latest eco-friendly models, and advocating for greener transportation solutions.
