SIC 42 Civil engineering: UK company statistics (October 2026)
Part of section F: Construction.
Key figures compared with the UK
| Measure | SIC 42 | All UK | Difference |
|---|---|---|---|
| Active companies | 25,457 | 5,166,057 | 0.5% of UK |
| Median company age (years) | 7.1 | 5.6 | 27% higher |
| Incorporated in the last 3 years | 27.8% | 34.0% | 6.2 pts lower |
| Filing micro-entity accounts | 34.3% | 32.4% | close to UK |
| Filing dormant accounts | 7.1% | 10.8% | 3.7 pts lower |
| Accounts overdue | 2.1% | 1.8% | 0.3 pts higher |
| Under a proposal to strike off | 12.7% | 7.4% | 5.3 pts higher |
| In liquidation, administration or receivership | 3.0% | 2.0% | 1.0 pts higher |
| With outstanding charges (secured lending) | 10.8% | 12.1% | 1.3 pts lower |
| Median net assets | £15k | £3,113 | 390% higher |
| Negative net assets | 11.6% | 18.8% | 7.2 pts lower |
| Net current liabilities | 25.9% | 36.2% | 10.3 pts lower |
| Median cash at bank | £25k | £10k | 149% higher |
| Cash covers creditors due within a year | 36.8% | 35.3% | close to UK |
| Holding £100k or more in cash | 31.5% | 20.3% | 11.2 pts higher |
| Median employees (where stated) | 1 | 1 | close to UK |
Balance sheet measures use each active company's most recent machine-readable (iXBRL) accounts with a period ending in 2024 or later: 19,849 companies here (78.0% of active). Net assets 25th to 75th percentile: £186 to £118k. Cash 25th to 75th percentile: £2,309 to £166k.
Share with negative net assets, 2014 to 2025
Share of accounts with net liabilities (total liabilities larger than total assets) by financial year end, for companies on the live register. Dissolved companies are not included because the register no longer lists their industry, so earlier years show survivors. Negative net assets is a warning sign, not proof of insolvency: see what negative net assets means.
Accounts types filed
| Type of last accounts | Share here | Share UK |
|---|---|---|
| Micro-entity | 34.3% | 32.4% |
| Total exemption full | 30.9% | 23.8% |
| No accounts filed yet | 18.3% | 26.0% |
| Dormant | 7.1% | 10.8% |
| Unaudited abridged | 4.5% | 2.9% |
| Full (audited) | 2.0% | 1.5% |
| Small | 1.4% | 1.2% |
| Audit exemption subsidiary | 0.6% | 0.7% |
The type shows how much a company has to disclose. Micro-entity and abridged accounts contain no profit and loss account on the public record. Read more about accounts categories and micro-entities.
Active companies by year of incorporation
Companies incorporated in each year that are still active today. Younger cohorts are larger partly because older ones have been dissolved.
Most common activity codes
| SIC | Activity | Live companies |
|---|---|---|
| 42990 | Construction of other civil engineering projects n.e.c. | 16,393 |
| 42220 | Construction of utility projects for electricity and telecommunications | 4,132 |
| 42110 | Construction of roads and motorways | 4,056 |
| 42120 | Construction of railways and underground railways | 3,414 |
| 42910 | Construction of water projects | 1,021 |
| 42210 | Construction of utility projects for fluids | 974 |
| 42130 | Construction of bridges and tunnels | 210 |
Methodology
Industry is the first SIC code each company declares on the Companies House register (snapshot 1 October 2026); the dormant placeholder 99999 is excluded. Status, accounts type and due dates come from the register. Financial measures come from our parse of 37 million iXBRL accounts filed since 2008; values above £100bn are treated as extraction errors. Companies filing paper or PDF accounts are not in the balance sheet figures. Full details: methodology.
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