Car Mods and Insurance: What to Declare and Why It Matters
Do you need to tell your insurer about car modifications? What counts as a mod, how mods can affect premiums and claims, and how to find mod-friendly cover.
By Ayoub Farid · · 2 min read
Insurance is the least exciting part of modding and one of the most important. Undeclared modifications can cause serious problems if you ever need to claim.
What insurers usually count as a modification
Rules vary by insurer and country, but commonly:
- wheels and tires different from factory options
- suspension changes (lowering, lifting)
- body kits, spoilers and wraps (color changes)
- engine and exhaust modifications
- lighting changes
- interior changes like seats
Even cosmetic changes like a wrap may need declaring. Ask your insurer.
Why declare
- An undeclared mod can give an insurer grounds to reduce or refuse a claim.
- Some mods (anti-theft devices, for example) can lower premiums.
- Agreed-value policies can cover the cost of your build.
Finding mod-friendly insurance
- specialist enthusiast insurers
- owners' club partner policies
- agreed-value or classic car policies for special builds
Which mods tend to affect premiums most
| Mod type | Typical impact |
|---|---|
| Engine tuning, turbo or supercharger | Often significant |
| Exhaust and intake | Moderate |
| Suspension and wheels | Small to moderate |
| Body kits and wraps | Small to moderate |
| Security upgrades (immobilizer, tracker) | Can reduce premiums |
| Interior and audio | Small, but declare high-value items |
These are general patterns, not quotes; every insurer prices differently.
Questions to ask your insurer
- Which of my modifications need to be declared?
- Are aftermarket parts covered at replacement value or only market value?
- Do you offer an agreed-value policy for modified cars?
- Will you repair with the same aftermarket parts after a claim?
- Do I need to tell you before each new mod, or at renewal?
Keep good records
Photos, receipts and part numbers make claims easier and help prove value; see how to plan a car build. A dated build log also helps when you sell a modified car.
Plan with insurance in mind
Before buying, preview mods on your car with CarForge and ask your insurer how they'd treat them. Also check are car mods legal? and mods and resale.
Frequently asked questions
Do I need to tell my insurer about a wrap?
Often yes, especially if it changes the car's color. Check your policy.
Will mods increase my premium?
Some will, some won't. Performance mods usually have the biggest effect.
What happens if I don't declare mods?
An insurer may reduce or refuse a claim. Always declare.
Is there insurance for modified cars?
Yes. Specialist insurers and agreed-value policies are designed for modified cars.
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