How to Structure a Construction Company: Set-Up and Roles
The short answer
Structure a construction company in two layers: the legal set-up (sole trader or limited company, plus CIS, VAT, PAYE and insurance registered at the right time) and the people structure (six jobs every firm has, given to named people as you grow, with the owner moving to sales and the numbers).
- Two layers, not one. The legal structure decides tax and liability. The people structure decides whether the company runs without you.
- Sole trader or Ltd. A sole trader is personally responsible for all the business's debts. A limited company caps the owners' liability at their investment and pays Corporation Tax (19% up to £50,000 profit, 25% above £250,000).
- Every construction company has six jobs: sales, estimating, delivery, commercial, finance and admin, and leadership. At the start the owner does all six.
- Hand jobs over in order as turnover grows: admin, site lead, estimator, project manager, then sales.
"Structure" means two different things for a construction company, and owners usually fix only one. The legal structure (sole trader or limited company, and what you register for) decides your tax and your personal risk. The people structure (who owns which job) decides whether the company can run, and grow, without you on every site.
This guide shows how to structure a construction company on both layers, with the org chart to aim for at each stage. It is for UK building and trade firms. Want your roles and next hire mapped with you? Book a free strategy call. Just starting out? Read how to start a construction business first.
Sole trader or limited company: the legal structure
Most builders start as sole traders. The question is when the risk and the tax make a limited company the better choice.
| Structure | Liability | Tax | Admin | Set-up |
|---|---|---|---|---|
| Sole trader | You are personally responsible for all the business's debts | Income Tax and National Insurance on profits | Lightest: keep records, file a Self Assessment return | Register with HMRC |
| Partnership | Partners personally share responsibility for the business's losses and bills | Each partner is taxed on their share of the profits | A nominated partner manages the partnership's tax returns and records | Register with HMRC |
| Limited company | Owners responsible only up to their investment | Corporation Tax on profits; directors pay tax on what they take out | Company accounts, tax returns, directors' duties | £100 online at Companies House, usually within 24 hours |
Corporation Tax is 19% on profits up to £50,000 and 25% above £250,000, with marginal relief in between. For setting your own wage either way, see how much a builder should pay themselves.
Common reasons builders move to a limited company:
- Bigger contracts. A single job going wrong can now cost more than you own.
- Staff and subbies. More people on site, more liability.
- Client expectations. Commercial clients and main contractors often prefer to contract with a company.
- Profits. Once profits are high enough, the tax can work out better. Ask your accountant to run your own numbers.
Starting with little or no savings? See how to start a construction company with no money.
Register the right things at the right time
These are triggered by what you do, not by which structure you chose.
| Trigger | What to register | Rule |
|---|---|---|
| Taxable turnover over £90,000 in 12 months (or expected) | VAT | Register with HMRC. Voluntary below that |
| You pay your first subcontractor | CIS contractor | Before the first subcontractor. Verify each one, deduct 20% (30% if unverified), file by the 19th monthly |
| You work as a subbie and want full payment | CIS gross payment status | Turnover test: company £30,000 per director or £100,000; sole trader £30,000 (excluding VAT and materials) |
| You pay your first employee | PAYE | Before the first payday, up to 2 months ahead |
| You employ anyone (not only family) | Employers' liability insurance | At least £5 million cover. £2,500 fine per day without it |
| You employ staff | Workplace pension | Employer pays at least 3% on qualifying earnings |
Taking on your first employee "for a few weeks" before PAYE and employers' liability are in place. The fine for no employers' liability cover is £2,500 for every day.
The six jobs every construction company has
Whatever your size, the same six jobs need doing. At the start the owner does all of them, which is why the owner works 60 hours and the company stays the same size.
- Sales. Finding clients, site visits, presenting quotes, follow-up.
- Estimating. Take-offs, pricing, subcontract enquiries, margin.
- Delivery. Programme, site management, subbies, quality, snagging.
- Commercial. Contracts, valuations, variations, final accounts.
- Finance and admin. Invoices, chasing, CIS returns, payroll, VAT, cash flow.
- Leadership. Targets, hiring, the weekly numbers, decisions.
These map to the four blocks every BizMentor program installs:
- Win: sales
- Price and protect: estimating and commercial
- Deliver: delivery
- Lead: finance, admin and leadership
The Systems Blueprint for UK Builders
The 6 core systems and the order to build them. Free PDF.
Get the free guideThe org chart at each stage
Typical structures, not rules. Your trade, job size and partners will change the details.
Stage 1: up to about £150K, 0–2 people
- Owner All six jobs, often still on the tools.
- First hand-over Admin or a virtual assistant for calls, invoices and chasing.
- Delivery You, plus a trusted subbie or two.
Stage 2: about £150K–£500K, 2+ people
- Owner Sales, estimating and the numbers.
- Site lead or foreman Runs jobs day to day.
- Admin Invoices, CIS returns, bookings, chasing.
- Subbie bank Two or three reliable subbies per trade.
Stage 3: £500K and up, team of 3–5+, average job £20K+
- Owner / managing director: sales, key clients, big quotes, hiring, weekly numbers.
- Estimator: prices from your rates library. You check the big ones.
- Project manager: runs several jobs, clients and subbies. Site managers report to them. See when to hire a site manager, PM or operations manager.
- Commercial: valuations, variations, final accounts, in-house or bought in.
- Bookkeeper or finance lead: cash flow, CIS, VAT, payroll.
- Sales support: follow-ups and relationships, often commission-based at first.
At Craftex, commercial strategy, procurement, contracts, pricing and margin protection sit with a dedicated commercial director, Joe Crawford, who has 37+ years in commercial construction. That is the job most growing firms leave with the owner for too long.
Still doing all six jobs yourself?
Book a free call and we'll map which one to hand over first.
Partners: split the jobs, not the sites
Many building companies are run by two or three partners: friends, brothers, people who worked together on site. Often nobody wrote down who does what.
Adam and Ali, two partners, sat at about £500K for more than three years. Adam ran 90% of the business himself: pricing, 4–5 hours of admin a day, materials, trades and site visits. Ali worked on the tools.
The fix was a structure decision. Adam moved to 6 hours a day on sales and 30 minutes on admin. Delivery of their £49K and £12K jobs was fully subcontracted, and they hired two full-time multi-trades. Within four months they won a £528K project. Individual results, not typical or guaranteed.
How to split roles between partners:
- By job, not by site. One owns sales and pricing. One owns delivery and the team.
- Write it down. Who decides what, up to what value, and who signs off a quote.
- Pay for the job done, not only the share held.
- Put a shareholders' agreement in place with a solicitor: what happens if one partner leaves, falls ill or wants out. Already falling out? Read what to do when a partner isn't pulling his weight.
Run the structure every week
A structure on paper does nothing until the numbers flow through it. Keep a one-page dashboard: leads, quotes and jobs won; jobs on programme; cash, money owed and margin; weeks of signed work.
Then hold a 30-minute weekly meeting: the numbers, each live job, the pipeline, then actions with an owner and a date. To check where your structure is weakest today, take the free 4-minute Construction Business Scorecard.
Help building yours
No two construction companies need the same structure. One owner is a natural salesperson and should never price a job again. Another is a brilliant estimator who hates the phone, and should hire a salesperson once the sales process is written down.
Sviat Jay runs Craftex, a London main contractor, and mentors owners one-to-one himself. He finds where you are strongest and builds the structure around it.
The flagship is one-to-one, by application. Smaller firms start in small groups (max 10–20) with regular one-to-ones. It is built for results in about 4 months rather than 1–3-year programs. To map your own structure, book a free strategy call.
Is your firm past £1M, and do you want a structure run for you? Our fractional COO and FD service sets up the operating system, weekly numbers, project controls, hiring and structure.
Want the right structure for your company and your partners?
Book your business assessment.
Check your structure this month
Tax, company and employment points are general information as of October 2026. Check the details with your accountant or solicitor.
Your company structure
- Legal structure reviewed with your accountant against this year's profit
- VAT, CIS, PAYE and employers' liability in place for what you do today
- Each of the six jobs has one named owner
- Partners' roles and decision limits written down
- A one-page dashboard and a 30-minute weekly meeting in the diary
