How to Start a Construction Business in the UK (2026)
Construction is the UK's biggest sector by number of businesses — and one of the easiest to start badly. There's no single "builder's licence," so people register and start trading, then get caught out months later by CIS, a missing CSCS card, or a trade-specific registration they didn't know applied. This guide lays out every step in order so that doesn't happen to you.
Step 1 — Prove your trade and get site-ready
There's no legal qualification to be a "builder," but customers, insurers and sites expect proof of competence.
- Most trades hold an NVQ Level 2 or 3 in their discipline.
- A CSCS card is needed to get onto most commercial sites (electricians use the ECS card instead).
Trade-specific — check which applies to you (each has its own full guide):
- Gas / boilers / heating → you must be Gas Safe registered (a legal requirement).
- Electrical work → Part P competent person scheme (NICEIC/NAPIT) to self-certify domestic work.
- Plumbing → no licence for water work, but G3 for unvented cylinders and WaterSafe membership help.
Step 2 — Choose your structure and register with HMRC
- Sole trader — simplest; register for Self Assessment, get a UTR. You're personally liable.
- Limited company — limited liability, often more tax-efficient; register at Companies House (~£50), then Corporation Tax.
Register within 3 months of starting to trade.
Step 3 — Register for CIS
The Construction Industry Scheme is the one nearly everyone in the trade hits. If you work for main contractors you're a subcontractor — registering drops the tax deducted from your payments from 30% to 20%. If you pay your own subbies, you must register as a contractor too. Filing is monthly, with penalties from £100 for being late.
Step 4 — Get insured
- Public liability — not legally required but effectively essential; £1m–£5m.
- Employers' liability — a legal requirement the moment you employ anyone.
- Tools, plant and van cover, and professional indemnity if you give design advice.
Step 5 — The practical setup
- Business bank account (keep business and personal money separate).
- Waste carrier registration with the Environment Agency if you ever remove waste from a site.
- VAT — register once turnover exceeds £90,000 (watch the domestic reverse charge if you're VAT-registered and working for other contractors).
Construction business requirements at a glance
| Requirement | Needed? |
|---|---|
| Builder's licence | ❌ No general licence exists |
| Trade qualification (NVQ) + CSCS/ECS card | ✅ Expected for site work & insurance |
| Gas Safe / Part P / G3 | ✅ Only if you do gas / electrical / unvented work |
| HMRC registration | ✅ Sole trader or limited company |
| CIS registration | ✅ If you subcontract or hire subbies |
| Public liability insurance | ⚠️ Effectively essential |
| Employers' liability insurance | ✅ Legal if you employ anyone |
| Waste carrier registration | ⚪ If you carry waste |
| VAT registration | ✅ Once turnover > £90,000 |
Start your construction business the easy way
Every requirement above depends on your trade and how you work. Spark builds your exact construction setup checklist — the right registrations in the right order, with the official forms and CIS registration pointed to directly — and tracks your deadlines so nothing slips. It's free.
Build my free checklist →FAQ
Do I need a licence to start a construction business in the UK? No overarching licence — but specific work (gas, electrical, unvented water) needs its own registration, and CIS applies to almost everyone in the trade.
What's the one thing people forget? CIS registration and the trade-specific registration for their work (Gas Safe, Part P). Both are easy to miss and costly to skip.
When do I register for VAT? Once turnover passes £90,000 in any 12-month period.
Last reviewed 2026. Confirm current fees and rules on the official GOV.UK and scheme pages before acting.