Starting a building company in the UK is straightforward if you know the steps. There’s no specific licence required to call yourself a builder, but there’s a clear set of registrations, insurances, and schemes you need to set up properly before you take on your first job as a business owner.
This guide covers everything in order — from choosing your business structure to getting your first client through the door.
Key Takeaways
- Sole trader is fine when starting out; a limited company makes more sense once your turnover exceeds roughly £40,000–50,000 per year
- Registering as a sole trader with HMRC is free and takes around 10 minutes at gov.uk — do it within three months of starting to trade
- You must register as a CIS contractor with HMRC as soon as you start paying subcontractors — even for one-off payments
- Public liability insurance is non-negotiable before taking your first job; expect to pay £200–£800/year as a sole trader, more for a limited company with employees
- If you employ workers directly, you’ll need employers’ liability insurance (legally required) and will likely owe the CITB levy — 0.35% of your wage bill
- A professional website and Google Business Profile are among the fastest ways to generate steady enquiries for a new building business
Step 1: Choose Your Business Structure
Most builders start as sole traders. It’s free, involves no ongoing filing requirements beyond a self-assessment tax return, and you can always switch to a limited company later.
| Structure | Setup Cost | Annual Admin | Best For |
|---|---|---|---|
| Sole trader | Free | Self-assessment return (January) | Starting out, turnover under £50k/year |
| Limited company | £12 via Companies House | Corporation tax return + confirmation statement | Higher turnover, commercial contracts, employees |
| Partnership | Free | Shared self-assessment | Two builders going in together |
When does a limited company make sense?
At higher turnover levels, a limited company can be tax-efficient — you pay yourself a salary (typically around the National Insurance threshold, roughly £12,570/year in 2026) and take the rest as dividends, which are taxed at a lower rate than income. Many builders also find that commercial clients and main contractors prefer dealing with a limited company.
The main downside is admin: you’ll need to file accounts with Companies House, submit a corporation tax return to HMRC, and keep more detailed records. Either use an accountant (around £500–£1,200/year for a small company) or accounting software like QuickBooks or Xero.
To register as a sole trader: Go to gov.uk/register-for-self-assessment. You’ll receive a Unique Taxpayer Reference (UTR) number within 10 working days.
To register a limited company: Go to Companies House. Online registration costs £12 and typically completes within 24 hours.
Step 2: Register for Tax
Self Assessment (Sole Traders)
You must notify HMRC that you’re self-employed as soon as you start trading. Register by 5 October following the end of your first tax year — but registering earlier avoids confusion and fines. Keep receipts for everything: van, fuel, tools, materials, insurance, phone, training — all reduce your taxable income.
Corporation Tax (Limited Companies)
You must register your company for corporation tax within three months of starting to trade. This is done through HMRC’s Business Tax Account, separate from Companies House registration. Corporation tax in 2026 is 25% on profits above £250,000, and 19% for profits under £50,000, with tapering relief in between.
VAT
You don’t need to register for VAT until your taxable turnover hits £90,000/year (the current threshold as of 2026). Many builders register voluntarily earlier so they can reclaim VAT on materials and equipment — worth considering if your costs are high.
Step 3: Register for the Construction Industry Scheme (CIS)
The Construction Industry Scheme is one of the most important — and most overlooked — registrations for building companies.
If you’re paying subcontractors, you must register as a CIS contractor with HMRC before making your first payment to a subie. As a contractor, you’re responsible for:
- Verifying each subcontractor with HMRC before paying them
- Deducting 20% from payments to verified subcontractors (or 30% for unverified ones)
- Submitting monthly CIS returns to HMRC
- Giving subcontractors a payment and deduction statement each time you pay them
If you’re also working as a subcontractor on other people’s projects, register as a subcontractor too so contractors can verify your status and deduct the correct rate.
You can register for CIS at gov.uk/what-is-the-construction-industry-scheme. Registration is free and takes around 10 minutes online.
Getting CIS wrong is one of the most common mistakes new building company owners make. According to HMRC, late or incorrect CIS returns result in automatic penalties starting at £100 per month. Set up a system from day one.
Step 4: Get Your Insurance in Place
Insurance needs to be sorted before you take your first job — no exceptions.
| Cover | What It Pays For | Typical Annual Cost |
|---|---|---|
| Public liability insurance | Third-party injury or property damage | £200–£800 (sole trader), more for companies |
| Employers’ liability | Staff injuries on site (legally required if employing anyone) | £400–£1,500 depending on headcount |
| Tool and equipment insurance | Theft or damage to your kit | £150–£400 |
| Contract works insurance | Damage to the building or materials during a project | £200–£600 |
| Professional indemnity | Claims arising from design advice or specification errors | £200–£800 |
Builders typically need at least £2 million of public liability cover for most domestic jobs, and £5 million or more for commercial contracts. Many main contractors won’t let you on site without the right cover level in writing.
For more detail, see our guide: Public Liability Insurance for Builders.
If you plan to employ anyone — even casual workers — employers’ liability insurance is a legal requirement under the Employers’ Liability (Compulsory Insurance) Act 1969. The minimum cover is £5 million, though most policies provide £10 million as standard.
Step 5: CITB Levy (If You’re Employing Workers)
If your business employs workers directly, you’ll likely owe the CITB levy — a statutory training contribution collected by the Construction Industry Training Board.
The levy rate in 2026 is 0.35% of your total payroll for directly employed workers, plus 1.25% of CIS-registered subcontractor labour costs. Small employers (wages under £120,000/year) pay a reduced rate or are exempt.
You register with CITB when your business meets the threshold. In return, you can claim CITB grants to fund apprenticeships, NVQs, site safety training, and other staff development costs — which often more than offset the levy for businesses investing in training.
More information at citb.co.uk.
Step 6: Qualifications and CSCS Cards
There’s no single licence to start a building company, but qualifications matter in practice. Most commercial sites won’t allow access without a [CSCS card](/blog/cscs-card-explained/), and domestic clients increasingly ask for proof of training when getting quotes.
The minimum for general building work is an NVQ Level 2 in Construction Operations or a trade-specific NVQ (bricklaying, plastering, groundworks, etc.). This leads to the CSCS Blue Skilled Worker card — the standard card for most building operatives.
- CSCS Health, Safety and Environment test: £36 (CITB-administered)
- CSCS card fee: £36 (valid for five years)
If you’re running a company and supervising others, you’ll want a CSCS Gold Card (supervisor level), which requires an NVQ Level 3 or equivalent and the Management Test.
For a full breakdown of qualifications, see our guide: Builder Qualifications UK.
Step 7: Join a Trade Association
Membership of the Federation of Master Builders (FMB) or similar body signals competence to potential clients and opens doors to larger contracts. The FMB vets applicants — you need to demonstrate quality of work and hold the right insurance — and lists members in a public directory that homeowners actively use.
| Association | Annual Fee (Approx) | Key Benefit |
|---|---|---|
| Federation of Master Builders (FMB) | £200–£400 (turnover-dependent) | Consumer directory, dispute resolution scheme |
| Build UK | Varies | Access to main contractor frameworks |
| Constructionline | £100–£400 | Pre-qualification for public sector and large commercial contracts |
| TrustMark | From £500/year | Government-endorsed scheme for domestic work |
The FMB is the most practical choice for builders focused on domestic projects — extensions, conversions, renovations. Constructionline and Build UK matter more if you want access to framework contracts and public sector work.
Step 8: Startup Costs
Running a building company costs more than most trades at the outset. The main upfront items:
| Item | Typical Cost Range |
|---|---|
| Van (decent 1-tonne or 3.5-tonne) | £10,000–£30,000 |
| Tools (drills, saws, lifting equipment, hand tools) | £2,000–£8,000 |
| Vehicle livery and signage | £300–£800 |
| Website | From £49/month (no upfront with Digital Tradies) |
| Insurance (first year) | £600–£2,000 depending on cover |
| CSCS card and test | £72 |
| Accounting software | £15–£50/month |
| Working capital (materials float) | £2,000–£10,000 |
Total realistic startup: £15,000–£50,000 depending on what tools and vehicles you already own. Second-hand vans and equipment reduce this significantly.
Step 9: Pricing Jobs
Underpricing is the fastest way to kill a new building company. Most jobs should be priced on a cost-plus basis:
Materials + Labour + Overheads + Margin = Your Quote
A common mistake is forgetting overheads when pricing: van finance, fuel, insurance, tools, accounting, phone, and downtime between jobs. These typically add 15–25% on top of your direct materials and labour costs.
Typical day rates for builders in 2026:
| Role | Typical Day Rate (SE England) | Typical Day Rate (North/Scotland) |
|---|---|---|
| Sole trader builder | £200–£350 | £170–£280 |
| Skilled labourer | £130–£200 | £110–£170 |
| Site manager | £250–£400 | £200–£330 |
For more detailed pricing guidance, see our guides: Builder Day Rate UK and Builder Hourly Rate UK.
Always put quotes in writing. A simple one-page document covering scope, price, materials allowance, payment schedule, and any exclusions prevents the disputes that hurt young businesses most.
Step 10: Get Your First Clients
Most new building companies start with:
- Previous employers and contacts — letting former employers know you’ve set up. They often pass overflow work, especially during busy periods.
- Word of mouth from your network — friends, family, and neighbours. Don’t be shy about it.
- Google Business Profile — setting this up (free) puts your business on Google Maps and local search results. A handful of early reviews makes a big difference to how often you appear.
- Checkatrade, MyBuilder, or Rated People — useful for getting early jobs while your reputation builds, though the fees and lead quality vary.
- FMB directory — once you’re a member, homeowners actively search this when they want a vetted builder.
According to the Federation of Master Builders, the most common reason homeowners give for choosing a builder is a personal recommendation — but the second most common is finding them online. That gap is closing fast.
A professional website matters more than most builders expect. It’s not just a vanity item — it’s the thing that converts someone who finds you on Google into an actual enquiry. Digital Tradies builds websites for building companies from £49/month with no upfront cost, and you’re live within three days.
For a deeper look at generating a steady flow of work, see: Marketing for Builders.
Frequently Asked Questions
Do I need a licence to start a building company in the UK? There’s no general building licence in the UK. You don’t need a specific permit to call yourself a builder or take on construction projects. However, certain types of work — gas, electrical, and plumbing — are regulated and require qualified operatives with the relevant registrations (Gas Safe, NICEIC, etc.). You’ll also need planning permission and Building Control sign-off for specific project types, but that’s the client’s responsibility, not a licence you need to hold.
How much does it cost to start a building company in the UK? Realistic startup costs range from £15,000 to £50,000, depending largely on whether you already own a van and tools. The unavoidable costs are insurance (£600–£2,000 in year one), CSCS card and test (£72), and business registration (£12 for a limited company, free for sole trader). Materials float and working capital add to this — most building work requires buying materials upfront before you’re paid.
Do I need to register for CIS if I only use one subcontractor? Yes. As soon as you pay any subcontractor for construction work — even once — you’re a CIS contractor and must register with HMRC before making that payment. There’s no minimum threshold. Failure to register and operate CIS correctly results in automatic penalties and can trigger a tax investigation.
Is it better to start as a sole trader or limited company? For most builders starting out, sole trader is simpler and perfectly adequate. You’ll pay more tax as profits grow above roughly £50,000/year, which is when switching to a limited company typically makes financial sense. Many builders wait until they have a few years of steady trading behind them before making the switch — the admin overhead of running a limited company isn’t worth it early on.
What insurance does a building company need? At minimum: public liability insurance (£2 million cover or more) and, if you employ anyone, employers’ liability insurance (legally required, minimum £5 million). Contract works insurance — which covers the project itself against damage mid-build — is increasingly expected by clients on larger jobs. Tool insurance and professional indemnity are worth adding as your workload grows.
