Photo by Shashwat Narkhede on Unsplash

Something has shifted in how drivers approach car maintenance. Not a sudden change, but a gradual and now accelerating move away from the assumption that a repair means paying for a new part from a franchised dealer or main garage. The numbers behind that shift are worth understanding, because they explain why the market for used car parts in the UK is growing faster than at any point in the last decade.

Repair costs for drivers have risen sharply and consistently across multiple categories. According to analysis of more than 20,000 real-world warranty repairs carried out by Warranty Solutions Group, alternator repairs alone rose by 23 per cent year on year between 2024 and 2025, from an average claim of £492 to over £607. That is a significant jump for what is considered a routine repair on an ageing vehicle.

 23%: Year-on-year rise in alternator repair costs, WSG claims data 2025.

The picture across the broader repair market is similarly stark. Warrantywise data show that repair costs for the UK's ten most popular used cars increased by 20 per cent in 2024 compared to 2023, with some models seeing increases of up to 30 per cent. The Association of British Insurers reported that the cost of vehicle repairs paid out by insurers reached a record £7.7 billion in 2024: part of a total claims payout of £11.7 billion, itself a 17 per cent increase on the previous year.

These are not abstract industry statistics. They translate directly into the bills that land on a driver's doormat after a visit to a garage, bills that, in many cases, are no longer manageable within a normal monthly budget. WSG's own survey of more than 1,000 motorists in 2025 found that nearly 60 per cent said they would not be able to afford a repair bill above £500 without borrowing.

Nearly 60% of UK motorists said in 2025 they could not afford a repair bill above £500 without borrowing. — WSG motorist survey, 2025 

The rise in repair costs is not the result of a single factor. It is the convergence of several pressures that have built simultaneously and show no clear sign of reversing.

Labour costs are the most straightforward contributor. The Institute of the Motor Industry reports approximately 23,000 vacancies in the UK automotive aftermarket, with 48 per cent of garages citing recruitment as a significant operational challenge. Fewer technicians means higher rates for the ones available. WSG's data shows average labour rates rising by approximately 5 per cent year on year, adding between £20 and £40 to many routine repairs even where the actual time spent on the job has not changed.

Parts inflation is the second major driver. The ABI reports that the cost of vehicle parts rose by over 15 per cent in the year to 2025. Parts now account for 52 per cent of total repair expenses according to market research, a proportion that is climbing each year. Post-Brexit trade friction has added customs costs and delays to parts imported from the EU. Supply chain disruptions that began during the pandemic continue to have knock-on effects on component availability, particularly for electronic parts.

Modern vehicle complexity has amplified both of these pressures. A cracked windscreen on a 2017 Ford Focus costs around £250 to replace. The same repair on a 2024 Focus, equipped with a heated screen and a lane-assist camera embedded in the glass, costs over £1,000, because the ADAS system must be recalibrated after replacement. Paint and bodywork materials have increased by over 30 per cent in two years. Specialist equipment and diagnostics required for ADAS-equipped vehicles have pushed the cost of even straightforward jobs higher.

 £11.7 billion: Total motor insurance claims paid by UK insurers in 2024 — ABI.

The Write-Off Effect

Rising repair costs are also changing how insurance companies handle damaged vehicles. When the cost of repairing a car approaches its pre-accident market value, typically around the 60 per cent threshold, an insurer will declare it a total loss. As repair costs rise, more cars breach this threshold.

DVLA data obtained via a Freedom of Information request shows that 562,185 vehicles were recorded as written off in 2024. The proportion of vehicles being written off has remained at historically high levels, peaking at over 73 per cent of non-fault claims in 2023. Each of these write-offs generates a supply of components: engines, gearboxes, suspension, lighting, interior parts, that are removed from vehicles written off for bodywork or structural reasons, often with their mechanical components completely untouched.

This supply is one of the structural foundations of the used auto parts market. A car written off because front-end repair costs exceed the insurer's threshold still has a functioning engine. Its gearbox has never been opened. Its interior is pristine. Its rear suspension is in the same condition it was in the morning before the accident. Those components do not disappear when the car is written off. They enter the used parts supply chain, where they are documented, listed, and sold to drivers and garages who need them.

 562,185: Vehicles recorded as written off in the UK in 2024 — DVLA via Freedom of Information. 

For UK drivers facing repair bills that have grown significantly in three years, the used parts market offers a straightforward economic argument: the same component, from the same original manufacturer, at a fraction of the new price.

This is not a new concept, but the scale of the cost differential has widened to a point where it is reshaping driver behaviour. A new BMW headlight from a franchised dealer costs over £1,200. The same genuine unit from a documented low-mileage donor car can cost £300 to £600. A new alternator from a dealer is typically £250 to £400 before fitting. A genuine used alternator from a verified source with a warranty is considerably less. The saving on structural components, parts that do not degrade through existence, only through use, is often 50 to 70 per cent against new dealer pricing.

The growth in the used auto parts market is also being driven by better availability and better sourcing standards. The rise of specialist online parts suppliers, ATF-permitted dismantling operations, and model-specific breakers yards has improved the quality of stock documentation and buyer protection considerably. Parts listed with confirmed donor mileage, actual photographs, and a 30-day warranty are now the expected standard from reputable suppliers, rather than the exception.

The connection between repair costs and insurance premiums is direct and documented. Motor insurers pay out more when repairs cost more, and they recover those losses through premium increases spread across the entire policyholder base. The ABI's data shows the average motor insurance premium rose by 15 per cent in 2024. Even drivers with clean records and no claims history are paying more because the cost of repairing all cars has increased.

This creates a compounding effect for out-of-warranty vehicle owners. Their insurance premiums are higher. Their repair bills, when repairs are needed, are larger. The financial case for sourcing used auto parts rather than new dealer parts becomes more compelling with each year's data.

The shift towards used car parts is not a compromise. For structural components, engines, gearboxes, suspension units, headlights, body panels, a genuine used part from a documented donor vehicle performs identically to a new one. It is the same component, made by the same manufacturer, carrying the same specifications. The only variable is mileage, and on structural components, mileage does not represent degradation of engineering integrity.

The practical implications are significant. A driver facing a £1,200 headlight replacement has an alternative that costs £400 and performs identically. A driver facing a £500 alternator bill has access to a genuine used unit with a warranty at a fraction of that cost. The used auto parts market, properly accessed through reputable and documented suppliers, is not a secondary option. For the majority of repairs on out-of-warranty vehicles, it is the most rational one.

The data on repair cost inflation shows no indication of reversing. Labour shortages in the automotive sector are structural and long-term. Parts inflation is linked to supply chain complexity that is not resolving quickly. Vehicle technology is continuing to add cost and complexity to repairs. For UK drivers navigating this environment, the used parts market is not a fallback position. It is an increasingly well-established and well-documented primary option, and the numbers make a compelling case for treating it as one.