Start with a clearly defined scope
A price is only as good as the work description behind it. Write down deliverables, quantities, quality standards, schedule, site access, exclusions and who supplies materials. Ambiguous scope creates expensive disagreements later.
Build a direct-cost estimate
Estimate labor hours by task and multiply them by a loaded labor rate, not only the wage. Add materials including waste and delivery, equipment operating costs, subcontractors, travel, permits and disposal. Use written supplier quotes where possible and note when prices may expire.
Allocate overhead and contingency separately
Your business still pays for accounting, software, office space, vehicles and administration when no project is running. Allocate a defensible share to each job. Keep contingency visible as an allowance for identified uncertainty; do not silently assume every risk will disappear.
Set a target margin, not just a markup
Suppose your estimated complete cost is €18,000 and you want a 25% profit margin. The target price is €18,000 ÷ 0.75 = €24,000. A 25% markup would give only €22,500 and a 20% margin. These are illustrative figures, before applicable taxes.
Test the quote before submitting
Check what happens if labor hours rise by 10%, materials increase, or a subcontractor is delayed. If a modest change wipes out profit, review the scope, allowances or price. Consider payment terms and cash flow as well as accounting profit.
Manage changes in writing
A profitable original contract can become unprofitable through unapproved extra work. Record the request, price impact and schedule impact; obtain approval according to your contract before proceeding where required. Keep the variation separate from the original estimate.
Learn from completed jobs
After handover, compare quoted hours and quantities against actual results. Identify the cost categories that were consistently underestimated. Use this feedback to improve the next tender rather than relying on a single generic markup.
Examples are illustrative, exclude applicable taxes unless stated, and are provided for general educational purposes. Check local regulations and consult a qualified adviser for decisions specific to your business.