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Vehicle Modifications: What You Need to Know Before Making Changes

This article is for all Marshmallow customers considering modifying their vehicle during or after purchasing a car insurance policy with us.

Updated over a week ago

What Is a Vehicle Modification?

A vehicle modification refers to any change made to your car after it was manufactured. This includes:

  • Adding new features (e.g. a towbar or parking sensors)

  • Altering the appearance (e.g. tinted windows)

  • Adjusting performance or structural components (e.g. engine tuning, suspension changes)

If your car looks, feels, or performs differently from how it left the factory, it counts as a modification.


Before You Modify: Contact Customer Support

Always speak to our customer support team before making any changes to your car.

  • We’ll confirm whether the modification is allowed under your policy.

  • If it’s acceptable, we’ll update your policy and let you know about any cost changes.

  • If it’s not allowed, we’ll explain your options.


Modifications We Cover

The following modifications are typically accepted and can be added to your policy:

  • Tinted windows

  • Parking sensors

  • Roof racks

  • Towbars


Modifications That Increase Your Premium

Some changes are acceptable but will raise your premium. These include performance-related upgrades. In such cases:

  • We’ll calculate the new premium.

  • You’ll need to pay the difference via a manual policy change.

  • We’ll invoice you for the new amount.

You’ll always be told in advance how much the increase will be.


Modifications We Don’t Cover

We cannot insure cars with the following modifications:

  • Additional or modified seating

  • Engine tuning or remapping

  • Suspension changes (e.g. lowering kits)

  • Turbocharging or supercharging

If your car already has one of these, unfortunately we won’t be able to offer or continue your cover.


Important Reminders

  • All modifications must be reported to us. Failure to do so may invalidate your policy.

  • We don’t offer discounts for any modifications.

  • Vans can only have up to two modifications on the policy.

  • If your modification is approved, we’ll:

    • Update your policy details

    • Apply any necessary charges

    • Provide payment options for monthly or annual customers

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