Get a copy of your vehicle’s pre-accident condition. You may be able to find this on your insurance claim, or from the police report filed after the accident.
Take photographs of all visible signs of damage to your car and any other parties involved in the accident (e.g., other cars, trees).
Get an estimate for repairs as soon as possible after an accident occurs to determine how much money will be needed for repairs before submitting a diminished value claim. You should also get quotes from repair shops that specialize in fixing custom cars like yours so you can compare prices and quality between them before choosing one shop over another; this comparison will help ensure that you don’t overpay when making repairs after an accident occurs on your custom car’s bodywork or paint job.