A truck with a lift kit, aftermarket wheels, a bed cover and an upgraded audio system can carry thousands of dollars of equipment that the insurer has never been told about. When it is stolen or totaled, the settlement is built on what the vehicle is worth, and the question becomes whether those additions were ever part of that figure.
The default: the vehicle as manufactured
Collision and comprehensive coverage promise to pay the actual cash value of the covered vehicle. Valuation models are built from market data for the vehicle by year, model, trim, mileage and condition, which means they describe a vehicle in the configuration it was sold in.
Most policy forms then add a small allowance, usually called custom parts and equipment or a similar phrase, that provides a limited amount of coverage for permanently installed additions. That built-in amount is modest by design. It is intended to cover a set of floor mats and a hitch, not a build.
What counts as custom parts and equipment
The definitions vary, but policies generally look for equipment that is permanently installed and not factory original. Typical examples:
- Wheels, tires and suspension components including lift and lowering kits
- Audio, video and navigation equipment installed after purchase
- Bed liners, tonneau covers, camper shells, racks and running boards
- Winches, light bars, brush guards and off-road bumpers
- Engine and exhaust modifications
- Custom paint, wraps, murals and body kits
- Interior modifications such as replacement seats or upholstery
- Wheelchair lifts, hand controls and other accessibility equipment
Two categories usually fall outside it. Removable items such as a portable electronics device or loose tools are generally personal property rather than vehicle equipment, which puts them on the homeowners or renters side; see property away from home. And equipment installed for a business, such as a service body or mounted tools, generally belongs on a commercial policy rather than a personal one. See commercial versus personal auto.
How the coverage is added
Where an insurer offers it, custom parts and equipment coverage is bought as a stated amount above the built-in allowance, and it usually requires you to document what is being covered.
| Step | What is involved |
|---|---|
| Inventory the additions | A list of each item, what it is, and when it was installed |
| Value them | Receipts and installation invoices are the strongest evidence |
| Photograph them | Before any loss, from several angles, showing the installed condition |
| Request the limit | An amount that reflects the total, not a round number chosen casually |
| Confirm the settlement basis | Whether the additions are settled at actual cash value or a stated amount |
The settlement basis is the part worth pressing on. Aftermarket equipment depreciates, sometimes faster than the vehicle, and an actual cash value settlement on a five-year-old audio system will not fund a replacement. Some insurers offer a stated or agreed value approach for scheduled equipment, which is a different and often better outcome. That mechanism is described in classic car insurance and agreed value.
Why insurers care about modifications beyond the money
Disclosing modifications is not only about getting the value covered. Some modifications change how the insurer views the risk.
- Performance modifications can affect eligibility. Engine work, forced induction and similar changes may move a vehicle out of a standard program.
- Suspension changes alter handling and headlight aim, and lifted vehicles are subject to state equipment regulations.
- Safety system interference. Modifications that affect sensors, cameras or radar units can impair driver assistance systems and complicate repairs. See safety technology and repair costs.
- Theft attractiveness. Wheels and audio equipment are among the most commonly stolen vehicle components.
- Legality. Equipment that does not comply with state vehicle codes creates problems in both a claim and an inspection.
An undisclosed modification that materially changes the risk can support a coverage dispute later. Disclosure is the cheap step; the argument at claim time is the expensive one.
Accessibility equipment is a specific case
Wheelchair lifts, ramps, transfer seats and hand controls are frequently more expensive than every other modification on this list combined, and they are not optional to the person who depends on them.
Ask specifically how the insurer handles them. Some treat adaptive equipment as custom parts requiring a scheduled amount; some have a dedicated endorsement; some address it through the vehicle's stated value. What matters is that the equipment is covered for what it costs to replace, and that a loss of the vehicle does not leave the owner without the means to drive.
At claim time
Provide the documentation immediately. An adjuster building a valuation from market data has no way to know about your additions unless you tell them, and the earlier the list arrives the less rework there is.
Expect the appraisal to separate the two. The vehicle is valued as a base unit, and the covered equipment is valued alongside it. That is normal.
Understand the interaction with a total loss. Equipment value raises the amount at stake, which can affect whether a vehicle is repairable or written off. It also raises the settlement. See when your car is totaled.
Do not assume the shop will reinstall aftermarket parts. Repair procedures and parts availability for modified vehicles can be more complicated, and it is worth discussing before the work starts. See choosing a repair shop and the parts they use.
If someone else caused the loss, the equipment is part of the damage they owe, and the same documentation supports that third-party claim. Depreciation of a modified vehicle after repair may also raise a diminished value question.
Practical notes
- Update the schedule when you add something. A list from three years ago is not a list of what is on the vehicle now.
- Keep receipts in a place that survives the vehicle. A folder of invoices in the glovebox is not useful after a theft or a fire.
- Check the limit against the total, not against each item. Custom parts limits are usually aggregate.
- Ask whether the coverage applies to both collision and comprehensive. Theft of wheels is a comprehensive loss; damage in a crash is a collision loss.
- Motorcycles, RVs and off-road vehicles have the same issue, often more acutely, since accessories can represent a large share of the total value. See also motorcycle insurance basics.
Whether custom parts and equipment coverage is available, what the built-in allowance is, how scheduled equipment is valued, and how modifications affect eligibility all vary by insurer, by policy and by state, and the policy documents control. For your own situation, speak with a licensed agent or your insurer. You can also request auto insurance quotes and get connected with licensed providers in your area.