Going self-employed as a mechanic means deciding early whether you are mobile, garage-based, or both. That single choice shapes almost every other pricing and setup decision that follows.
Charge for diagnostic time as its own line
Inspection time that identifies a fault is real, billable expertise, separate from the labour that fixes it. Fold it silently into the final repair cost and you invite a "but you didn't even fix anything yet" complaint if a customer declines the repair after the diagnosis. Naming the diagnostic charge upfront avoids that entirely.
Decide mobile vs garage-based before you price anything
A mobile setup reaches customers who cannot easily bring a car to you, but it limits the jobs you can safely and legally do without a lift or proper equipment. A garage-based setup handles bigger jobs but adds fixed overhead from day one. Most solo mechanics start with one clear focus instead of trying to offer both from the outset.
Record vehicle details on every invoice, not just the job sheet
Make, model, registration, and mileage turn a generic invoice into a proper service record the customer can use for a warranty claim or hand to a future buyer. It also protects you if a dispute ever comes down to which car and which visit is being questioned.
List warranty-covered parts and labour at full standard price, then add a matching "warranty cover" line at the same amount. It shows the customer the real value of work that would otherwise look invisible on the page.
Bundle shop supplies into one honest line
Sealant, degreaser, rags, and small fasteners rarely justify listing individually, but they add up across a service. A single "shop supplies" line covering these avoids either quietly eating the cost yourself or listing a dozen 20p items that make the invoice look padded.
Get a second opinion before quoting an unusual fault
Some faults are genuinely ambiguous even after inspection. Quote a firm price before you are confident and you risk either underquoting a job that turns out bigger, or losing the customer with an inflated number to cover the uncertainty. It is reasonable to quote diagnostic time alone first, then a firm repair price once the actual cause is confirmed.
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