Modified car insurance in the UK is a specialist market worth approximately £1.2 billion annually. Standard comparison site policies are almost always inadequate for modified cars — they exclude performance modifications, impose usage restrictions, and pay market value (not build value) at total loss. This guide covers everything you need to get the right UK cover for your modified car.

What Must You Declare to UK Insurers?

Under the Consumer Insurance (Disclosure and Representations) Act 2012, you must take ‘reasonable care’ to provide accurate information. In practice, this means declaring every modification that differs from the manufacturer’s standard specification. The Financial Conduct Authority (FCA) expects insurers to treat non-disclosure proportionately, but in practice undisclosed mods remain the most common reason for claim disputes.

Required declarations include:

• Engine modifications (exhausts, intakes, camshafts, forced induction)
• Suspension changes (lowering springs, coilovers, anti-roll bars)
• Wheel and tyre upgrades (size, brand, type)
• Bodywork changes (spoilers, splitters, vinyl wraps, paint)
• Interior changes (roll cage, racing seats, harnesses, stripped trim)
• Electronics (ECU tunes, standalone management systems)

Best UK Specialist Insurers for Modified Cars

The following specialists are recognised in the UK market for modified car cover:

• Adrian Flux — one of the UK’s largest specialist brokers; covers most modifications
• Footman James — strong on classic and performance cars, agreed value specialists
• Performance Direct — focused specifically on performance and modified vehicles
• AIB Insurance — competitive on track-use endorsements
• Brentacre — good for heavily modified or kit cars

How Much Does Modified Car Insurance Cost in the UK?

Annual premiums for UK modified car insurance vary significantly based on age, location, NCB, and the extent of modifications:

Track Use in the UK

UK modified car policies typically exclude all ‘competitive use’ and most exclude any track use by default. You can add a track day endorsement to specialist policies for an additional premium. This covers non-competitive circuit days only — for sanctioned motorsport (Drag Challenge UK, sprint events, hillclimbs), you need a dedicated motorsport policy from the BRSCC, MSA, or specialist motorsport insurers.

{“@context”:”https://schema.org”,”@type”:”FAQPage”,”mainEntity”:[{
“@type”: “Question”,
“name”: “Do standard UK comparison sites cover modified cars?”,
“acceptedAnswer”: {“@type”: “Answer”, “text”: “Standard comparison sites like Compare The Market and GoCompare rarely return adequate policies for modified cars. They may return a quote, but the policy often excludes modifications not listed at inception. Specialist brokers are almost always better for modified car owners.”}
}{
“@type”: “Question”,
“name”: “Does my no-claims bonus apply to specialist modified car insurance?”,
“acceptedAnswer”: {“@type”: “Answer”, “text”: “Yes. Most UK specialist insurers accept standard NCB certificates. Some also offer protected NCB options for modified car policies. Your NCB remains your most significant discount factor, even with modifications.”}
}{
“@type”: “Question”,
“name”: “Is track day use automatically excluded from UK car insurance?”,
“acceptedAnswer”: {“@type”: “Answer”, “text”: “Yes. Standard UK car insurance policies exclude all track use, competitive or otherwise. A track day endorsement must be added to your policy if you plan to use the car on a closed circuit. Without it, you have no cover the moment you enter the paddock.”}
}]}