Start with the cost of employing the person
The hourly wage is only the visible part of labour cost. A quote needs to recover the wider cost of making that person available to the job: employer costs, paid leave, training, insurance, tools or equipment that are genuinely tied to labour, and the non-billable time needed to keep projects moving.
A useful first step is to calculate an annual employment cost for each labour type, then divide it by realistic productive hours rather than every paid hour in the year. That gives you an internal cost rate. Keep that rate separate from the customer-facing selling rate so you can see how much contribution the work is expected to make.
- Base pay or subcontract labour cost
- Employer on-costs that apply to the worker
- Paid non-working time such as holiday and training
- Role-specific tools, PPE or recurring allowances where appropriate
- An allowance for unavoidable non-billable time
Use productive hours, not theoretical hours
A common estimating mistake is to divide annual labour cost by every contractual hour. That assumes every paid hour can be charged to a project. In reality, teams spend time travelling, loading, ordering materials, attending briefings, correcting snags and handling administration. Those hours still have to be paid for.
Estimate productive hours from your own records. If you do not yet have reliable data, start with a conservative assumption and refine it after several completed jobs. The goal is not to make the labour rate look competitive; it is to make sure the rate reflects what the business really has to recover.
Estimate task hours before adding contingency
Build the labour quantity from the work itself. Break the job into measurable activities, assign the people or crew needed for each activity, and estimate the duration. This is more reliable than starting with a round labour allowance and trying to make the scope fit it.
Keep normal task time and contingency separate. Normal task time is what you expect if the work proceeds as planned. Contingency covers uncertainty that is reasonably foreseeable but difficult to measure precisely. Keeping the two separate makes later job-cost reviews far more useful.
- Site setup and protection
- Main installation or construction activities
- Testing, commissioning or finishing
- Cleaning, handover and snag allowance
- Known access, travel or coordination time
Convert cost into a selling rate deliberately
Once you know the internal hourly cost, decide how labour contributes to overhead and profit. Some businesses recover most overhead through labour; others spread it across labour, materials and fixed project charges. Either approach can work if it is consistent and measured against completed jobs.
Do not confuse markup with margin. A 25% markup on a £40 cost produces a £50 selling price, which is a 20% gross margin. If your commercial target is expressed as margin, use a margin calculation rather than simply adding the same percentage to cost.
Review estimated versus actual labour after every job
The best labour rate is only useful when the hours are realistic. Compare estimated hours with actual hours by work type, not just at total-project level. Repeated overruns on one activity may point to a bad estimating assumption, a workflow problem or a scope item that is being missed.
Over time, this feedback loop turns quoting from judgement alone into a repeatable estimating system. You should be able to explain why a labour allowance exists, what rate was used and which completed jobs support the assumption.