BUSINESS GUIDE · INSURANCE
Tuning Insurance Guide — Declaring Modifications to Insurers
How to declare ECU modifications to insurers in EU and UK markets. Workshops need to advise customers properly; insurers can refuse claims on undeclared modifications.
Table of contents
Why insurance matters
Every EU and UK insurer asks "has the vehicle been modified?" on the application. If you tick "no" with an ECU tune in place and have a claim, the insurer can void the policy and refuse to pay out. The unpaid claim then becomes a personal liability of the policyholder — potentially €10,000-100,000+ for a serious accident.
Workshops should always advise customers to declare modifications to their insurer. Document this advice on the work order.
What to declare
Workshop customers should declare:
- ECU tune (Stage 1 / 2 / 3 — even DPF / EGR / AdBlue Off counts as modification).
- Hardware changes (intake, downpipe, intercooler, turbo upgrade).
- Suspension changes (lowering springs, coilovers).
- Wheel / tyre upgrades over OEM size.
- Exhaust modifications.
Pricing impact
| Modification | Mainstream insurer | Specialist insurer |
|---|---|---|
| Stage 1 ECU only | +15-25% or decline | +5-10% |
| DPF / EGR Off only | +5-15% | +5% |
| Stage 2 + hardware | +25-50% or decline | +10-20% |
| Stage 3 build | Almost always decline | +30-50% |
Specialist insurers
Workshops should refer customers to:
- UK: Adrian Flux, Sky Insurance, Greenlight Insurance, A-Plan Performance.
- EU: Stellaris Tuning Insurance (EU-wide), Allianz Customised Vehicle (selected markets).
- US: Heacock Classic, Hagerty, American Modern.
Don\'t pretend the modification doesn\'t exist. Specialist insurers exist because mainstream insurers won\'t cover modified cars at all — better the customer pay 10% more on a policy that pays out than 0% extra on one that voids on first claim.
FAQ
Does ECU tuning need to be declared?
In the UK and most EU countries — yes. Failure to declare can void the policy. Specialist insurers like Adrian Flux (UK), Sky Insurance (UK), Stellaris Tuning Insurance (EU) handle modified cars.
How much does insurance go up for Stage 1?
Mainstream insurers: 15-40% premium increase or outright decline. Specialist insurers: 5-15% increase, no decline.
Should I tell my workshop customer about insurance?
Yes — best practice. Document on the work order that customer was advised to declare modification.