Capacity Planning CalculatorFor UK Electricians

Most sole trader and small electrical businesses do not plan their capacity — they simply say yes to every job that comes in and hope they can fit it all in. The result is predictable: some weeks are impossibly busy, with jobs running over, customers chasing completion dates, and evenings spent doing paperwork. Other weeks are quiet, with gaps in the schedule and no revenue coming in.

Capacity planning solves this by giving you a clear picture of how much work you can realistically handle. It starts with a simple calculation: how many productive, billable hours do you actually have available in a week, a month, or a year? Then it compares that against the work you have committed to. When your committed hours approach your available hours, you know you are at capacity and need to either decline work, subcontract, or extend timelines.

For electrical businesses with employees or regular subcontractors, capacity planning becomes even more critical. You need to allocate the right people to the right jobs based on skills, qualifications, and availability. A staff management system that tracks individual capacity alongside job requirements prevents the common problem of double-booking your team or leaving skilled electricians on jobs that do not require their qualifications.

Your billable capacity is not simply "8 hours a day, 5 days a week." There are significant deductions that most electricians do not account for. Here is a realistic calculation for a sole trader:

Starting point: 52 weeks x 5 days x 8 hours = 2,080 total hours per year.

Deduct holidays: 28 days minimum (statutory entitlement including bank holidays) = 224 hours. Many electricians take fewer holidays than this, but you should budget for at least 28 days to avoid burnout.

Deduct sick days: Budget 5 to 8 days per year = 40 to 64 hours. Even if you rarely get ill, one bout of flu or a minor injury can wipe out a week.

Deduct training: 3 to 5 days per year for CPD, update courses, and new qualifications = 24 to 40 hours. Use Elec-Mate's CPD tracker to log these hours automatically.

Deduct admin time: Quoting, invoicing, accounting, phone calls, and emails consume 3 to 5 hours per week = 156 to 260 hours per year.

Deduct travel time: 1 to 2 hours per day in non-billable travel = 250 to 500 hours per year.

Result: After all deductions, a typical sole trader has 1,350 to 1,600 billable hours per year — roughly 27 to 32 billable hours per week. That is your real capacity. Every job you quote and schedule must fit within these hours.

Your utilisation rate is the percentage of your available billable hours that you actually spend on billable work. It is calculated as: (hours billed to clients / total available billable hours) x 100.

Below 55%: You have too much idle time. Your marketing is not generating enough leads, you are declining too much work, or your pricing is putting clients off. Focus on lead generation and review your pricing strategy.

55% to 65%: Below target but sustainable. You have room to take on more work without overcommitting. This is common for electricians in their first year of business or those who have recently moved to a new area.

65% to 75%: The sweet spot. You are busy enough to be profitable but have enough buffer to handle overruns, urgent callouts, and quote requests without disrupting existing commitments.

75% to 85%: Very busy. You need to be disciplined about scheduling and may need to extend lead times for new work. Good for profitability but leaves little room for problems.

Above 85%: Danger zone. You are overcommitted. Jobs will overrun, quality may suffer, and you risk burning out. This is the signal to either raise prices (to reduce demand), hire help, or subcontract overflow work. Elec-Mate's business analytics dashboard tracks your utilisation rate weekly and alerts you when you exceed your target threshold.

Effective job scheduling goes beyond putting dates in a diary. It requires understanding how long each job type actually takes (not how long you hope it will take), building in realistic buffer time for overruns and unexpected issues, and sequencing jobs to minimise travel and maximise productive time on site.

Job duration estimation: Track how long each type of job actually takes you. A consumer unit change might be quoted at 4 hours but consistently takes 5.5 hours when you include preparation, testing, labelling, and paperwork. Over time, your actual duration data replaces your estimates, making your scheduling more accurate and your quotes more profitable.

Geographic clustering: Group jobs by location to minimise travel time. If you have three jobs in the same area of town, schedule them on consecutive days rather than alternating with jobs across town. The 30 to 45 minutes saved on each journey adds up to 1 to 2 extra billable hours per day.

Buffer time: Schedule 80% of your available time, not 100%. The remaining 20% absorbs overruns, urgent callouts, quote visits, and unexpected issues without displacing your committed work. If the buffer is not needed, you can fill it with smaller jobs or administrative tasks.

Elec-Mate's schedule manager provides a visual calendar view of your job commitments, colour-coded by job type and status, with drag-and-drop rescheduling and automatic conflict detection.

The decision to take on an employee or use subcontractors is one of the biggest in any electrical business. Hire too early and you have someone on the payroll without enough work to justify their cost. Hire too late and you lose jobs, miss deadlines, and burn out trying to do everything yourself.

Signals that you need help: Your utilisation rate has exceeded 85% for three consecutive months. You are regularly declining work or pushing start dates back by more than two weeks. You are working evenings and weekends on admin tasks. Your job satisfaction is declining because you are always rushing.

Subcontracting vs employing: Subcontracting is lower risk — you only pay for work done, there are no employer NI contributions, no holiday pay, and no employment obligations. But it is more expensive per hour and you have less control over quality and availability. Employing someone is a bigger commitment but gives you a dedicated resource at a lower hourly cost. Use the staff cost calculator to compare the true cost of each option.

Financial readiness: Before hiring, you need consistent revenue to cover the new person's cost even during quiet periods. As a rule of thumb, you should be able to cover three months of their salary from your cash reserves. Use the cash flow planner to model the financial impact of hiring before you commit.

Growing an electrical business from a sole trader to a small team requires planning across multiple dimensions: workload capacity, financial resources, management skills, and operational systems.

Revenue targets: Before adding staff, calculate the additional revenue you need to cover their cost and still increase your profit. If an employee costs £35,000 to £45,000 per year fully loaded (salary, employer NI, pension, holiday pay, tools, van), you need to generate that much additional revenue — plus profit margin — to justify the hire.

Systems and processes: A sole trader can run their business from their head — they know every job, every customer, every deadline. Once you have staff, you need systems: job management, scheduling, quality control, and communication. Elec-Mate provides all of these in a single platform, making the transition from sole trader to employer significantly smoother.

Apprentices: Taking on an apprentice is often the first step in growing a team. The initial cost is lower (apprentice wages are below fully qualified rates), the Apprenticeship Levy may cover training costs, and you get to train someone to your standards. See the apprenticeship employer guide for the full picture, including funding, off-the-job training requirements, and employer responsibilities.

Stage planning: Most successful electrical businesses grow in stages. Stage one: maximise your own capacity (target 75% utilisation). Stage two: add a subcontractor for overflow work. Stage three: hire your first employee or apprentice. Stage four: build a team. Each stage requires different skills, systems, and financial planning — Elec-Mate's business analytics help you know when you are ready for the next stage.