What kind of settlement are you talking about? If this is your vehicle that guessing was totaled, then the insurance will pay what it was worth (prior) to the accident. NO lawyer would take this case since it is for property damages, thus there is NO negotiation, since your vehicle is worth what it is or not.
What is this extra $15,000 that you state “could” get?
Now, if you was injured in this accident, then if the other driver/insurance agrees they are at fault, then the insurance (could) owe you an injury settlement that is (reimbursement) of the medical bills “any” lost wages then adds pain and suffering.
The standard fee for a lawyer to handle (injury) claims is 33% of YOUR settlement and if the claim goes into a lawsuit, then the standard is 40%.
Everyone thinks they need to hire a lawyer since they see so many billboards or TV ads state, if injured call lawyer X, since I will make you rich. And (no) insurance companies are not afraid of lawyers, since they get so many claims with lawyers, that it is just becomes another claim with a lawyer.
You want to hire a lawyer (if) the insurance disputes fault, or if they dispute your injuries. But if neither, then don’t, since most likely will end up with less, since (after) the lawyer takes their cut, the client could gets less than the lawyer.
retired auto adjuster