Comparing your estimate against what a job actually cost, line by line, is the simplest way to price the next job better. Most builders never do it, so the same mistakes get repeated job after job. The information is already in your job costs. You just need to line it up against the estimate and look.
When was the last time you finished a job and went back to compare what you estimated with what it really cost? Not just the total. Labour, materials, plant and subcontractors, each on its own.
The pattern nobody catches
Looking at one job on its own doesn't tell you much. Every job has surprises. The value comes from looking across several jobs. For example, if you compare estimated and actual labour hours across your last few jobs and every one of them ran over, that's not bad luck. That's an estimating habit.
Plenty of builders price the next job from gut feel and the last price they can remember. If you never go back and check, you keep making the same errors. You keep underestimating concrete labour. You keep missing the extra week of scaffolding. You keep forgetting the clean-up at the end.
Why most builders don't do it
It's not that they don't care. It's that the comparison is hard to do:
- The estimate and the costs use different categories. The estimate says "framing", the accounts say "materials" and "wages".
- Costs aren't tagged to jobs consistently, so the actual figures are incomplete.
- Labour hours aren't recorded against jobs, only total hours for payroll.
- Variations are mixed in, so it's hard to tell an estimating miss from a scope change.
- There's no time, because the next job has already started.
How to close the loop
- Use the same cost categories in your estimate and your job costing. This is the single most useful change. If the estimate has ten line items, set up the same ten in your accounting or job system.
- Tag every cost and every hour to a job and category as it comes in. See our post on whether you're tracking job costs or just guessing.
- Keep variations separate, with their own price and costs, so they don't hide estimating misses.
- Hold a short review when each job finishes. Put estimate and actual side by side for each category and ask: which lines were out, and why?
- Write down what you learned and update your estimating rates or checklist. A lesson that lives in someone's head gets forgotten.
- Look across jobs every quarter. Patterns show up across several jobs that you can't see in one.
Making the comparison automatic
Doing this by hand works, but it's easy to let slide. If your estimating and job costing data are connected, an estimate vs actual report can be produced automatically for every job, and even while the job is running. That lets you see overruns early, not just at the end. We cover this on construction job costing software.
Frequently asked questions
What is an estimate vs actual report?
It's a report that shows, for each cost category on a job, what you estimated, what it actually cost, and the difference. It's the main tool for improving future estimates.
How often should I compare estimates to actual costs?
At the end of every job, and across a group of recent jobs every quarter. On bigger jobs, check during the job too, so you can act on overruns.
Can I do estimate vs actual in Xero or MYOB?
Partly. Both can report costs by job. Matching those against your estimate line by line usually needs consistent cost categories, and often a connection between your estimating and accounting systems.
What if my actual costs are incomplete?
Fix the tagging first. Untagged bills and labour hours that aren't recorded against jobs are the usual gaps.
If you'd like estimate vs actual reporting without the spreadsheet work, book a free initial chat.