Overhead Allocation: Spreading Fixed Costs Fairly Across Your Jobs

Understanding Overheads in a One-Van Business

Running a one-van operation in the UK doesn't exempt you from overheads. Quite the opposite — it's essential you acknowledge and allocate these costs or you won’t be in business for long. Overheads are the fixed and semi-fixed costs that exist whether you’re working or not: insurance, van servicing, tool replacement, phone and data, accounting fees, subscriptions for quoting or scheduling apps and the odd bit of PPE. These are not 'nice to haves'—they’re the cost of having a business identity and being able to turn up to jobs without falling over when things go wrong.

Think of overheads as the background tape running your business. While you charge for labour and materials on the job, overheads pay for the things that let you take that job in the first place: van on the road, insurance in place, a phone that works and records to show when and where you’ve been. If you ignore them and only price to cover direct labour and materials you’ll find your bank balance shrinking even though the diary looks busy. That’s the trap I see most often with lads starting out—busy but broke.

You’ll hear some tradespeople say overheads are part of profit or that they ‘work till they drop’ to cover them. That’s not a strategy — it’s a slow burn to burnout. Treat overheads like a client that must be paid every month. If you don’t allocate them deliberately into your pricing, they’ll eat margins and make investment impossible. Once you recognise them as a recurring cost, you can build a process to charge them back to the jobs that fund your van, tools and time off.

Finally, don’t confuse overheads with materials or on-site labour. Overheads are shared across every job, large or small. That’s why you need a consistent method to apportion them so every quote contributes its fair share. Getting this right gives you predictability: you’ll know what to expect each month, be able to plan for holiday or slow months and not be surprised when the bills arrive. It’s dull work, but it’s the foundation of a profitable trade business.

Breaking Down Your Annual Overheads

Start by listing everything you pay for the business in a year. Be brutal and include the small stuff: insurance (public liability, van, tool cover), MOTs and servicing, tyre changes, tool replacement fund, subscriptions for software, bank or card fees, accountancy or bookkeeping costs, training, safety kit, protective clothing and phone and data. Even things that don’t feel businessy—like a subscription to a quoting app or a morning coffee on site—add up. If you’re VAT registered, note VAT separately; overheads still exist whether you reclaim VAT or not.

Put real numbers against each item. Don’t guess; open bank statements and invoices. For example, van servicing and MOT might be £1,200 per year, insurance £900, phone and broadband £600, accountant £600, tool replacement £300, subscriptions and software £360 and training £250. These are example figures for illustration — your numbers will differ — but you need precise totals so the next step isn’t a stab in the dark. Use the last 12 months of actuals where possible. If you’re new, use realistic market prices rather than optimistic guesses.

Decide what’s fixed and what’s semi-variable. Fixed means it happens regardless of how many jobs you take—insurance is a good example. Semi-variable items, like fuel or consumables, move with activity and you may prefer to keep these in your direct job costs rather than overheads. Categorising helps when you’re splitting costs per hour or per day. It also helps spot opportunities to cut costs: maybe you can switch to a cheaper software bundle or time annual servicing to reduce emergency repairs.

Add a cushion for surprises and growth. Tools break and van parts fail; a contingency of 5–10% on your overhead total is sensible. It means you’re not caught short when an unexpected bill arrives. While it feels conservative, it keeps cashflow healthy and allows you to invest in the business — replacing a tool rather than borrowing, or taking a short break without panic. Once a year, review these figures and adjust. The market moves, bills increase and your business will change — don’t leave the numbers as a relic of the year you started out.

Allocating Overheads: The Nuts and Bolts

Once you've nailed down your annual overhead total, spread it across the hours or days you actually charge for. There are two straightforward methods: per-hour and per-day allocation. For per-hour, divide the annual overheads by your realistic chargeable hours in a year. Don’t use theoretical working hours; use the hours you can honestly bill clients for. If you’re on the tools 40 hours a week but only 30 are chargeable after travel, admin and breaks, use 30. Overhead per hour becomes a line on your labour rate, so every hour billed contributes to keeping the lights on.

Per-day allocation works the same but uses chargeable days instead of hours. If you estimate 200 workable days a year after bank holidays and sensible holiday time, divide the overhead total by 200 to find a daily overhead. This suits trades who price by the day — bricklayers, some plasterers and small builds. A daily overhead means you add that amount to your day rate or build it into the labour portion of a fixed price. Both methods achieve the same thing: making sure every job pays something towards the house costs.

Don’t forget travel and idle time. Chargeable hours exclude travel between jobs, set-up and tidy-up time, or waiting for materials. You should decide whether to include travel as a direct cost on the job (mileage, time) or absorb parts into overheads. My advice: charge travel separately where practical. It keeps job pricing honest and ensures long-distance or low-value short jobs don’t subsidise your overheads unfairly. Track how much travel and admin time you actually have; assumptions on these kill margins quicker than undercharging.

Apply the rate consistently and review. Once you have your overhead per hour or per day, use it in every quote. If you price hourly, add the overhead per hour to your base labour rate. If you quote day rates, include the daily overhead in the rate. Don’t hide it; mentally include it in your labour cost when deciding whether a job is worth doing. Lastly, review these allocations every six months or when costs change significantly. Fuel, insurance and tool replacement don’t stay static — neither should your overhead rate.

Embedding Overheads into Your Quotes and Day Rates

When you put a quote together, think of it as two parts: direct job costs (materials, direct labour time, subcontractors) and the overhead allocation that funds your business. Don’t be tempted to leave overheads out and hope you’ll make it up on the margin. For labour-based quotes, add your overhead per hour onto the time you expect to charge. For day-rate workers, include the daily overhead in your rate. This makes your price realistic, and helps prevent the ‘I was busy but not profitable’ problem that many one-van tradesfolk face.

Make the overhead inclusion part of your standard pricing script. If a joiner quotes £220 a day and their daily overhead is £70, that £70 must be covered either as a visible line or rolled into the £220 so the final number still funds the overhead. You don’t need to show clients a breakdown if you don’t want to, but you must understand the numbers behind the total. Transparency can help on larger jobs — explain that your price includes guarantees, insurance and quality standards; clients tend to accept higher quotes when they understand what they’re paying for.

Factor in the job’s profit margin as well. Overheads cover costs, not profit. After you’ve included overheads, add a sensible margin on the job for profit, risk and unexpected delays. Aim for a percentage that reflects your market and skill level; 10–20% is common for small contractors, but skilled trades with scarce specialisms can demand more. The point is, overheads get you to break-even on fixed costs, profit makes the business worth running. Don’t confuse the two — without profit there’s no reward for the risk and no cash to reinvest.

Finally, be ready to explain or defend your price. Clients will sometimes push back or ask for discounts. If you’ve built your price to cover overheads, you’re not just padding; you’re protecting the business that will stand behind the work. If a client wants a discount, offer a shorter scope rather than eating your overheads. For example: offer a phased approach, reduce extras, or split the work so it fits an affordable budget without undermining your overhead cover. That way you stay professional and profitable.

Worked Example: One-Van Builder Numbers

Let’s put real numbers to it so there’s no guesswork. Assume annual overheads total £6,000. That includes insurance £900, van servicing and MOT £1,200, tool replacement fund £400, phone and data £600, subscriptions and software £480, accounting £600 and a contingency of £820. Now decide realistic chargeable time. If you estimate 200 chargeable days a year, that’s 1,600 chargeable hours if you work eight-hour days, but you might only bill six hours a day on average once travel and admin are stripped out. So let’s use 1,200 chargeable hours as a cautious figure.

Divide £6,000 by 1,200 hours and you get £5 per hour overhead. That’s the amount each billed hour needs to contribute just to cover fixed costs. If your target pay rate for your time is £30 per hour, your labour rate to the client becomes £35 per hour before profit and materials. If you price by day and expect 200 chargeable days, £6,000 divided by 200 is £30 per day. Add that to your day rate so you don’t turn up and work for free towards the bills.

Now add profit. If you want a 15% margin on the job after overheads and direct costs, add that appropriately. Using the hourly example, add 15% to the combined labour plus overhead figure or build the margin into the final price. That might push your charge rate from £35 to around £40–£42 per hour depending on how you structure material mark-ups. It’s important to be methodical so your final quoted figure actually delivers the wage, overheads and profit you need.

Finally, test the maths across a month. If you charge £42 an hour and bill 100 hours in a month, that’s £4,200. Subtract materials and VAT if applicable, then remove overheads (100 hours × £5 = £500) and you’ll see what’s left for wages and profit. If the net isn’t enough to live on or fund the business, you need to either increase rates, reduce overheads or work more chargeable hours. This practical check keeps the business honest and prevents the ‘busy but not profitable’ trap.

Common Pitfalls and Practical Adjustments

Underestimating chargeable time is the number one killer of margins. People assume 8 hours on site equals 8 chargeable hours. It doesn’t. Travel, running errands, paperwork and waiting all take chunks out of those 8 hours. Track your time properly for a month to understand real chargeable hours. Use that data to adjust your overhead-per-hour calculation. If you’ve been using optimistic numbers, your overhead allocation will rise and your quotes must follow suit. It’s less fun raising prices, but better than working for nothing.

Another mistake is lumping variable items into overheads. Fuel, disposal skip costs, and small consumables are better treated as direct job costs because they vary widely by project. Leave overheads for the things that are stable and shared. That way, small jobs don’t subsidise a big fuel bill and large projects don’t unfairly absorb more fixed costs. Clear separation also makes quoting simpler and more defensible when clients ask why costs differ between jobs.

Be careful with discounts and ‘mate rates’. A discount that eats into your overhead coverage is damaging. If you want to offer a reduced price, do it by cutting scope or offering payment terms, not by chipping away at the overhead allocation. Similarly, be cautious with underpriced introductory offers; you’ll attract work but not the cash to run your business. If you do offer a special, set a clear expiry, track the jobs and review whether discounts are translating into repeat, profitable work.

Finally, review overheads regularly. Prices for insurance, fuel and parts rise; software costs change; you might buy better gear. Review numbers every six months and when any big change happens — new van, different supplier, hiring someone. Make adjustments to your overhead allocation and pricing and communicate transparently with clients where required. Running a one-van business is about being hands-on and pragmatic — keep the numbers in your pocket and check them often.

Common mistakes

• –Ignoring overheads when pricing jobs leads to undercharging and reduced profits.
• –Failing to review and update overhead calculations, resulting in outdated pricing strategies.
• –Not accounting for unexpected increases in overhead costs, like rising insurance premiums.
• –Pricing jobs below the true cost of operation in a bid to undercut competitors.
• –Assuming small jobs can cover overheads just as effectively as larger ones without proper calculation.
• –Neglecting to account for both fixed and variable overheads in pricing models.

Questions people ask

What exactly is an overhead?

Overheads are the unavoidable running costs of your business — the expenses that don't directly tie to any one job but are necessary to keep things ticking over. This includes insurance, professional fees, and equipment maintenance.

How do I calculate my overheads?

List every fixed annual expense your business encounters, from insurance to phone bills. Total these costs, then divide by your realistic working hours or days per year to determine how much you need to add to each job to cover them.

Should I show overheads on my quotes?

For smaller domestic jobs, embedding overheads in your hourly rate is advised. For larger or commercial projects, you might choose to list them separately to provide transparency and professionalism.

How often should I review my overheads?

Review annually or whenever significant changes occur in your business, like acquiring new equipment or a change in insurance rates. This ensures your pricing remains accurate and reflective of your costs.

What's the risk of not including overheads in pricing?

Not accounting for overheads means your business will struggle with cash flow, possibly leading to financial difficulties. It's essential for maintaining profitability and financial health.