Profitable jobs are chosen at the quote, not on site

Every builder has finished a job, done the sums, and wondered where the money went. The instinct is to blame the site: the weather, the subbie, the client who kept changing their mind. Look closer and the truth is usually older than the first day on site. The job was never going to pay. It was priced not to.

Margin is decided early, spent late

Think of a job's profit as a tank of fuel. The size of the tank is fixed on the day you sign the quote: price agreed, scope agreed, assumptions locked. Everything after that only drains it: a missed measurement here, an unpriced skip there, a fortnight of programme drift. Site management determines how fast the tank empties. Only the quote determines how big it was to begin with.

This is why "we'll make it up on site" is the most expensive sentence in construction. You cannot manage your way into margin that was never priced in. A brilliant site team running a badly quoted job just loses money efficiently.

The anatomy of a losing job

Losing jobs look unlucky from the inside. From the outside they look almost identical, and the wounds are nearly always quote-stage wounds:

• Guessed quantities. The brickwork was "about forty metres" and was actually fifty-five. Nobody measured, so nobody knew, so nobody charged for it. The fix is boring: measure everything, every time. The seven estimating mistakes that kill margin starts here.
• Invisible costs unpriced. Scaffold, skips, welfare, supervision, parking, small tools. Individually small, together often ten percent of a domestic job, and routinely absorbed in silence. Preliminaries are the classic under-priced line.
• No contingency on a risky job. A 1900s terrace with unknown drains priced as confidently as a new-build garage.
• Scope left vague. "Making good" with no definition becomes three extra weeks of decorating, free.
• A discount given at the end of the conversation, taken straight out of margin because nothing else in the number moved.

Price the whole job, not the visible job

The visible job is bricks, timber, plaster, paint. The whole job includes everything the visible job needs to exist: access, protection, waste, supervision, drying time, the second trip to the merchant, the hour on the phone to building control. A quote built from a proper bill of quantities forces the whole job into view, line by line, which is precisely why quantity surveyors price that way and why serious builders quote with one.

This used to be the trade-off: the whole-job quote took evenings you did not have. It is the specific problem QS Quoter was built to remove: describe the job or upload the drawings, and it produces a measured bill of quantities at your own rates through a structured, reviewable workflow, with the client copy and your private cost copy separated, and every line editable before it goes anywhere. The structure does the remembering, so nothing invisible gets priced at zero by accident.

Choosing the job is part of pricing the job

Some jobs are unprofitable at any sensible price, because the real cost is the client, the site, or the unknowns. Quote stage is where you are allowed to notice. Warning lights worth respecting: a client who has fallen out with two builders already, a "small job" with seven undecided details, drawings that contradict themselves, budget talk that starts with "our absolute maximum". You can price for these with fat contingency, or you can decline politely. Both are winning moves. Our piece on when the smartest price is no price covers the walk-away call in detail.

Feed the site's lessons back into the rate book

The loop closes when finished jobs teach your future quotes. Once a job wraps, compare the quote against reality: which lines ran over, which rates were thin, what did the extras actually cost you? Ten minutes per job, written into your rate book, and your next quote is measurably sharper than your last. Firms that do this for a year develop a quiet superpower: their prices stop being hopeful and start being predictive. Keeping your rates in one editable place, rather than in your head, is what makes the loop practical.

The blunt summary

Site discipline protects margin; only the quote creates it. Measure instead of guessing, price the invisible lines, attach contingency to risk, pick clients with your eyes open, and feed every finished job back into your rates. Do that consistently and the end-of-job surprise disappears, in the best possible way: the profit you counted at the quote is the profit in the bank.