Every service business eventually gets asked to do something outside the usual scope, and the instinct is to guess a number that feels safe. The guess is wrong in one of two expensive directions, and there is a better method that takes about twenty extra minutes.
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The job you have never done before
Every service business eventually gets asked to do something outside the usual scope. The instinct is to guess a number that feels safe, and the guess is wrong in one of two expensive directions: too high and you never find out whether the work was good for you, too low and you fund the customer's project out of your own margin.
Break it into parts you have done
You have almost never done a job that is entirely new. You have done a version of each piece. Break the unknown job into its components, price the ones you recognize from your own records, and you are left with a much smaller genuinely unknown remainder.
That remainder is what you actually have to think about. Guessing at twenty percent of a job is a manageable risk; guessing at the whole thing is gambling.
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Find the time, then the price
Estimate labor hours before you estimate dollars. Hours are something your crew can sanity-check and you can compare against the job afterward. A price pulled out of the air teaches you nothing when the job is finished.
Add materials at real supplier quotes, not from memory, and get those quotes before you send the proposal rather than after.
Price the uncertainty explicitly
Do not bury a contingency inside a single number where you cannot see it and the customer cannot understand it. Either carry a stated allowance for the unknown portion, or write the unknown portion as time and materials with a cap, and say why.
Customers accept this far more readily than contractors expect. What they reject is a surprise invoice.
Charge for the discovery
If the unknown is large enough that no honest number exists yet, sell the investigation as its own small engagement. You get paid to learn, the customer gets a real price, and nobody signs a contract built on a guess.
The part everyone skips
After the job, compare estimated hours to actual hours and write down the difference with the reason. Three of these turn a new service into a known one. Without them you will be guessing again next year on the same kind of work.
When the answer is no
Sometimes the honest conclusion is that you cannot price it responsibly and the job is too large to absorb being wrong. Saying so costs you one job and protects the season. Taking it anyway is how a good year becomes an average one.
Where to start
Decompose into known parts, estimate hours before dollars, get real material quotes, state the uncertainty instead of hiding it, and record the variance afterward. Do that three times and the unfamiliar job becomes a line in your price book.
An estimate you cannot compare to the finished job teaches you nothing.
We help service businesses build the estimating process, the price book and the variance review that turn unfamiliar work into priced work.
Frequently asked questions
How do I estimate a job I have never done before?
Decompose it. You have almost never done a job that is entirely new — you have done a version of each component. Price the parts you recognize from your own completed-job records, and you are left with a much smaller genuinely unknown remainder that you actually have to think about. Estimate labor hours before dollars, because hours can be sanity-checked by your crew and compared against the job afterward. Get real supplier quotes before sending the proposal rather than after. If the unknown portion is still large, carry it as a stated allowance or as capped time and materials instead of burying a contingency inside one number.
Should I tell the customer part of the price is uncertain?
Yes, explicitly. Burying a contingency in a single figure means you cannot see it and the customer cannot understand it, and when the job runs long the conversation starts from a position where you already appeared certain. Customers accept a stated allowance or a capped time-and-materials line far more readily than contractors expect — what they reject is a surprise invoice. If the unknown is large enough that no honest number exists yet, sell the investigation as its own small paid engagement, so you get paid to learn and nobody signs a contract built on a guess.