Overheads and profit: setting a margin you can defend

Ask ten builders their margin and you will get three confident answers, five guesses and two changed subjects. Yet overheads and profit are the only part of the price that is entirely yours to control. Here is how to work out the real numbers, avoid the markup trap, and hold your figure when a client pushes.

Overheads are not profit, and confusing them is expensive

Start with the distinction the whole subject rests on. Overheads are what it costs to exist as a business before anyone lays a brick: the van, insurances, phone, accountant, software, yard or storage, tool replacement, training, the unpaid hours you spend quoting and chasing. Profit is what is left after the job costs and after those overheads, the reward for risk and the fund for growth.

A builder who charges "cost plus 15" and thinks that 15 is profit has usually made an accounting error, not a business. If overheads quietly consume 10 of those 15 points, the real profit is 5 percent, which is one bad plastering week away from zero. The fix is to know your overhead number cold, and to treat profit as a separate, deliberate charge on top of it.

Work out your real overhead number

The exercise takes one evening and most builders have never done it. List a full year of business costs that are not job costs. Be honest and complete:

• Vehicles: finance, fuel not charged to jobs, insurance, repairs
• Insurances: public liability, employers' liability, tools
• Professional: accountant, software subscriptions, phone, website
• Premises: yard, unit or storage, utilities
• Tools and plant you own: replacement and repair over the year
• Unbillable time: quoting, site visits for jobs you did not win, admin, chasing payments, priced at what your time is worth

Divide the total by the revenue you realistically turn over in a year, and you have your overhead percentage. For small firms this commonly comes out somewhere around 8 to 15 percent, and it is nearly always higher than the owner guessed, mostly because of the unbillable time line. That percentage now belongs in every quote, before a penny of profit is added.

Markup versus margin: the trap that shaves points

Here is the arithmetic mistake that costs small firms real money. Markup is a percentage added to cost; margin is the percentage of the final price that is not cost. They are not the same number, and the gap widens as the percentage grows.

So the builder who wants to "make 20 percent" and adds 20 percent to costs is actually running at 16.7, and after unpriced odds and ends may be nearer 12. If you want a 20 percent margin, the markup is 25 percent: divide cost by 0.8 rather than multiplying by 1.2. Decide which language you speak, price in it consistently, and check your final accounts in the same language so the feedback means something.

Setting the figure: what the margin has to cover

With overheads recovered separately, what should profit be? There is no universal number, but there is a universal logic: the margin must pay you for risk, fund the quiet months, replace equipment, and leave something to grow on. Many established domestic firms land somewhere around 15 to 25 percent combined overheads and profit, tuning within that range for three things:

• Risk of the job. A fixed-price refurbishment of an unknown building deserves more points than repeat work for a developer you trust. The model you are pricing under matters too, as we cover in day rates vs priced work.
• How busy you are. A full order book is permission to price up. Winning every quote is not a compliment, it is a signal you are cheap.
• What the work is worth to the client. Speed, tidiness, communication and a professional quote justify a premium the spreadsheet cannot see, but the client can.

Defending it when the pressure comes

Every margin gets tested, usually in the phrase "another builder said he could do it for less". A defensible margin survives because it sits on a defensible estimate. When your price is a measured bill, the conversation changes from haggling to editing: if the client needs the number lower, scope comes out visibly, the porch, the tiling spec, the client supplies the sanitaryware, rather than points coming quietly off your profit. You can only negotiate this way if the quote is itemised in the first place, which is the practical argument for pricing with a bill of quantities.

Hold two rules. Never cut the margin without cutting scope, because a discount from profit is you paying to work. And never chase a price you know is below cost plus overheads; losing that job is the profitable outcome, a point argued properly in handling price objections.

If the estimating side of that discipline is the bottleneck, that part is now automatable: QS Quoter produces the measured bill at your rates with overheads and margin applied the way you set them, on a private copy the client never sees, so you walk into every negotiation knowing exactly where cost ends and your money begins.