How Contractors Make Money: The Four Margin Models

Ask ten contractors how the money in construction is made and nine will describe how the work is done. That is the whole problem. The work and the money are two different systems, and the contractors making serious money figured out early that you can be excellent at one and terrible at the other. There are only four ways a contracting business earns: selling days, pricing jobs, marking up other people's delivery, and holding contracts that pay on repeat. Everything else is a variation. Here is the honest math on each.

And because I do not bury the lede: the fourth section of this post is the model this whole site exists to explain - construction arbitrage, where you win the work as the contractor and deliver it through subcontractors while keeping the spread. It is how the operation behind this blog runs a 1,400+ UK subcontractor network, and it is the model the other three quietly feed into.

Model 1: Day rates - selling time

The default model. You charge for your presence: a day of your labor at a day price. In the UK, 2026 cost guides put general builder day rates at roughly £170-£320 depending on region, with skilled trades like electricians and plumbers commonly £280-£500 a day and London running 30-40% above the rest of the country. US equivalents vary even more by state and trade, but the structure is identical everywhere.

The math has a hard ceiling and it never moves. Five working days a week, maybe 46 weeks a year once weather, gaps between jobs and life get their share. At $500 a day that is $115,000 of revenue a year - before the van, the tools, the insurance, the fuel and the tax (figures in USD - the model and the math are identical in any currency). That is the absolute best case, reached only if you never have an empty day. And here is the part nobody says out loud: on a day rate, getting faster makes you poorer. Finish in three days what you quoted at five and you just refunded two days of income for being good at your job.

Model 2: Price work - selling outcomes

Fixed-price work flips the incentive. You quote the job, not the days, and the difference between your price and your cost is yours. Now efficiency pays you instead of the client. Industry benchmarks for 2026 put typical residential general contractor markup around 20-30% of project cost - though after overhead, the average firm keeps a net profit in the mid single digits. The gap between those two numbers is where jobs are won and lost: scope, pricing discipline and cost control.

The risk is real and it belongs to you. Underprice a fixed job, miss something in the scope, or let the client grow the job for free, and the loss is yours alone. Most contractors who swear off price work were not beaten by the model - they were beaten by their own scoping. If your quotes are gut feel instead of measured cost plus deliberate margin, day rates just hide the problem. I wrote about the discipline side of this in how much profit a contractor should make - the short version is that margin is a decision you make before the job, not a result you discover after it.

Model 3: Subcontracted delivery - selling management

This is where the ceiling comes off. Instead of delivering the job with your own hands, you deliver it through subcontractors at agreed prices and keep the spread between the client's price and the subcontract cost. Your capacity is no longer your calendar - it is how many jobs you can win, scope and manage at once. Two jobs running in parallel through subs beats any day rate you will ever charge.

The markup on subcontracted trades typically runs 10-25% depending on how much risk, coordination and client management you carry on top. UK operators should know the tax plumbing: under the Construction Industry Scheme, contractors deduct 20% from payments to registered subcontractors, 30% from unregistered ones, and 0% for subs holding gross payment status - build it into your cash-flow math from day one. Other countries have their own rules; the margin structure is the same everywhere, so check yours before the first job, and see whether this model is legal where you operate for the country-by-country picture.

Done properly, this is where the real money in contracting is made - not because the percentage is huge but because it applies to volume your own hands could never deliver. Done lazily - no vetting, no scope documents, no site checks - it is how contractors end up with their name on another firm's bad work. The management is the job. If you skip it, the model punishes you.

Model 4: Maintenance contracts - selling repetition

One-off jobs mean one-off revenue: every month starts at zero. Maintenance and repair contracts - with property managers, letting agents, housing providers, facilities teams, commercial landlords - pay you repeatedly for being reliable. The jobs are smaller, but they arrive without marketing cost, they smooth the feast-and-famine cycle, and each contract compounds: a property manager with 300 units does not want ten contractors, they want one who answers the phone.

Maintenance work also pairs perfectly with Model 3, because a stream of small, repeatable jobs is exactly what a subcontractor network digests best. Reactive repairs, void refurbishments, compliance work - scoped once, priced from a schedule, delivered by subs, checked by you. This is the quiet backbone of a lot of seven-figure contracting businesses that never post a single before-and-after photo.

The four models side by side

How the highest earners stack them

The contractors at the top of this industry do not pick one model - they stack the last three and drop the first. Price work sets the margin. Subcontracted delivery removes the ceiling. Maintenance contracts remove the volatility. That stack is the model in full, and if you want the mechanics - pricing the spread, vetting subs, protecting yourself on scope - start with the levers that raise contractor income on this blog and the method library on constructionarbitrage.com. All of it is free.

Your hands can build a wage. Only margin builds a business.

@mointhemarket

Two honest caveats before the send-off. First, none of this is passive: winning work, scoping it and managing subs is a real operating job, just one your body can sustain for decades. Second, if you ever consider paying anyone to teach you this - including us - vet them first. Our pricing and structure are public on our mentorship page, price tags included, and we published what people find when they search our name precisely so you can judge us the way we tell you to judge everyone.