Optimising Your Profit Margins through Job Costing Accuracy
22 September 2026 · By Heaney Accounting
Many trades businesses fall into the trap of using a 'gut feel' approach to pricing their jobs. While you might know your standard hourly rate, you often overlook the hidden costs that bleed your margins dry over time. Accurate job costing requires you to track every cent spent on materials, travel, and non-billable administrative time for every single quote you submit.
When you fail to account for fuel, tool wear, and waste disposal in your estimates, you are essentially paying for your customers' work out of your own pocket. Start by logging every material invoice against a specific job number rather than just categorizing them as general business expenses. This granular visibility allows you to see which specific projects are actually padding your bank account and which ones are just keeping you busy for no gain.
Another major factor in profit erosion is underestimating the time spent on site versus travel time between locations. If you are doing residential service work, your transit time is a cost that needs to be baked into your quote or service fee. By reviewing your actual job duration versus your estimated time once a project concludes, you can refine your future quoting accuracy and ensure you aren't losing money on every extra hour worked.
Finally, don't forget to factor in your overheads when setting your profit targets. Your business insurance, trade licenses, and office software subscriptions are all costs that need to be recovered through your job markups. Once you begin tracking these variables precisely, you will have the confidence to reject low-margin projects and focus your energy on the types of work that generate the highest return for your business.
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