One solid estimate from a repair shop you trust is almost always enough after a car accident. No state law requires you to collect a specific number of repair estimates, and no insurer can force you to shop the damage around. The old advice to get three quotes traces back to a time when adjusters wanted to cherry-pick the lowest number, and it has not matched how claims actually work for a long time. What matters is that the single estimate you submit is thorough, well-documented, and built in the same estimating software the insurer uses on its end.
Why the Three-Estimate Rule Is a Myth
The three-estimate habit is one of the most persistent pieces of bad advice in auto claims. Insurers used to routinely ask for multiple quotes so they could pay against the lowest one, and some adjusters still suggest the practice out of habit. Across all 50 states, no law obligates a policyholder to gather a set number of estimates. Your insurer may ask for one estimate to open the file, and it will almost certainly run its own appraisal using estimating software regardless of what you turn in.
Collecting multiple estimates is not harmful if you genuinely want to compare shops. It is not something you owe the insurance company. Every extra appointment is another day the car sits unrepaired, and if it is sitting at a tow yard, another day of storage charges. If you already have a shop you trust, take the car there, have them write the estimate, and submit it. That is the whole obligation on your end.
Does the Number Change Based on Who Is Paying
The estimate process shifts slightly depending on whether the claim runs through your own insurer or the other driver’s, but the count does not.
In a first-party claim, you are filing under your own collision or comprehensive coverage. Your policy is a contract, and the insurer has specific rights spelled out in it, including the right to inspect the vehicle and run its own damage appraisal. The insurer can send a staff appraiser or a drive-in estimator to assess the damage independently of anything your shop submits. One estimate from your shop, plus the insurer’s own inspection, is the standard setup.
In a third-party claim, you are seeking payment from the at-fault driver’s insurance company. You have no contract with that insurer, so it cannot impose policy-based requirements on you. The carrier will still want to verify the damage, usually by sending its own adjuster or reviewing photos, but there is even more flexibility here. A single detailed estimate from a reputable shop is standard, and most third-party carriers accept it as long as the numbers align with their internal pricing databases.
What Makes One Estimate Strong Enough
Because you are relying on a single estimate, that estimate has to do real work. A few things separate one that holds up from one that gets pushed back.
Bring the shop your vehicle identification number, the 17-character code on the driver’s side dashboard near the windshield or on the door jamb sticker. This tells the estimator exactly what parts, trim level, and factory equipment your car has, which directly affects pricing. Bring the insurance policy numbers for all parties involved and the police report number from the accident. Take high-resolution photos of the damage before the appointment, capturing the impact zone from several angles and distances. Close-ups of cracked headlamps, displaced panels, or leaking fluids help the estimator flag components that might otherwise be missed during a quick walkaround. Mention any functional problems you have noticed since the accident: pulling to one side, unusual noises, warning lights.
A good estimator starts with a visual assessment of exterior damage and looks for signs of deeper problems, such as gaps between body panels that were not there before, paint stress marks near structural joints, or fluid pooling under the car. If the visible damage suggests possible structural involvement, the estimator may recommend a teardown before writing the full estimate. A teardown means removing bumper covers, fender liners, or interior trim to expose what is underneath, where frame damage, bent reinforcement bars, and cracked mounting brackets show up. Skipping this step is where most underpaid claims originate.
The estimate itself should be built in specialized software like CCC ONE, Mitchell, or Audatex. These platforms pull from databases of manufacturer repair procedures, regional labor rates, and parts catalogs to generate line-item pricing. Your insurer uses the same software on its end, which is why estimates that come out of these systems tend to align more closely with what the adjuster expects to see. A handwritten estimate on shop letterhead will get far more pushback than a system-generated one.
Why One Estimate Is Rarely the Final Number
Even a thorough initial estimate rarely captures everything, and this is another reason chasing multiple pre-repair estimates misses the point. The real revisions happen after disassembly. Once the shop starts pulling the car apart, technicians often find damage that was not visible during the surface inspection. A supplement is an updated estimate that accounts for the newly discovered work. Bent radiator supports behind an intact bumper cover, cracked wiring harnesses, and damaged sensors are common supplement items.
The shop documents the hidden damage with photos and detailed notes, then submits the revised estimate to the insurer for approval. Repairs typically pause until the supplement is authorized, which can add days to your timeline. This is normal. The alternative, writing an artificially high initial estimate to “cover” potential hidden damage, is something no reputable shop does, because insurers will not pay for speculative repairs.
Where this gets frustrating is when the insurer drags its feet on supplement approval. Most state insurance regulations require insurers to act with “reasonable promptness” when processing claims, but few states define that as a hard deadline in days. If repairs are stalled waiting for supplement authorization, call the adjuster directly and escalate if needed.
When Your Estimate and the Insurer’s Do Not Match
Even with one well-built estimate, the insurer’s own appraisal can come in lower. Two things drive most of the gap: labor rates and parts sourcing.
Insurance companies determine what they consider the “prevailing” or “competitive” labor rate for your geographic area and build their appraisals around that number. Current labor rates vary widely, ranging from under $100 per hour in lower-cost markets to over $200 per hour in major metro areas. Nearly half of all repair shops price their labor between $120 and $159 per hour. If your shop charges more than the insurer’s prevailing rate, the insurer may only pay up to its number, leaving you responsible for the gap. Ask your shop if it will negotiate directly with the insurer; experienced shops do this constantly and often reach an agreed price. You can also ask the insurer to justify its prevailing rate, because insurers sometimes rely on outdated surveys or artificially narrow geographic boundaries.
Parts are the other pressure point. Most policies allow the insurer to write estimates using aftermarket or recycled parts as long as those parts restore the vehicle to its pre-loss condition. If your shop installs original equipment manufacturer parts when the insurer’s estimate specifies aftermarket, you may owe the price difference. Roughly three dozen states require insurers to disclose on the estimate when non-OEM parts will be used, and a handful of states give owners of newer vehicles the right to insist on OEM parts, particularly while the car is still under its original manufacturer warranty. If aftermarket parts are going in, ask whether they carry CAPA certification, which means they have been independently tested against the originals for fit, performance, and durability.
Formal Dispute: The Appraisal Clause
When the gap between your estimate and the insurer’s is significant and negotiation stalls, most auto insurance policies contain an appraisal clause designed for exactly this situation. It applies when both sides agree a loss is covered but disagree on the dollar amount.
Either party can demand appraisal in writing. Each side then hires its own independent appraiser, and those two appraisers try to agree on the repair cost. If they agree, that figure is binding. If they cannot, they select a neutral umpire, and any two of the three can issue a binding award that sets the final payout. You pay for your appraiser, the insurer pays for its own, and umpire fees are split. For a minor dispute over a few hundred dollars, the process is not worth it. When the gap runs into the thousands, especially on structural or mechanical repairs, the appraisal clause is one of the most underused tools available to policyholders. Check your policy’s specific language, because deadlines and procedural details vary.
One Note on Total Loss
Your one estimate can matter even more if the car might be totaled. If the repair estimate approaches or exceeds a certain percentage of the vehicle’s actual cash value, the insurer will declare it a total loss rather than pay for repairs. That threshold varies by state, ranging from 60 percent to 100 percent of actual cash value. About 17 states do not use a fixed percentage and instead apply a total loss formula: if the repair cost plus the vehicle’s salvage value exceeds its actual cash value, it is totaled.
The initial estimate, before teardown, may come in just under that threshold. Once supplements for hidden damage are added, the total can cross the line. If you disagree with the insurer’s valuation of the vehicle in a total loss situation, the same appraisal clause applies to the value dispute, and you can support your position with dealer listings and private-sale ads for comparable vehicles of the same year, make, model, and mileage.
So the short answer stays short. One good estimate, built carefully and documented well, is what the claim actually needs. The work of protecting your payout happens after that first estimate, in the supplement process and, if it comes to it, the appraisal clause.