Ian Underhill Drainage and Building Specialist Limited
Registered name: IAN UNDERHILL DRAINAGE AND BUILDING SPECIALIST LIMITED
Ian Underhill Drainage and Building Specialist Limited made £51.9k revenue and £17.4k profit in the year to 31 Mar 2025.
Ian Underhill Drainage and Building Specialist Limited’s revenue fell 46% to £51.9k in the year to 31 Mar 2025, with £17.4k profit and 0 employees. The company is classified under “sewerage” and is based in Welling; we hold 3 years of its filed accounts.
- Status
- Active
- Location
- Welling, South East
- Age
- 7 yrs · since 2019
- Type
- Private Limited Company
Key figures
Badges are automated estimates derived from the filed figures — not statements of fact about the company.
Financial history
| Year to | 31 Mar 2023 | 31 Mar 2024 | 31 Mar 2025 |
|---|---|---|---|
| Disclosure | No P&L | Full P&L | Full P&L |
| Profit & loss | |||
| Revenue (turnover) | — | £95.4k | £51.9k |
| Cost of sales | — | — | £7.5k |
| Gross profit | — | £54.9k | £44.4k |
| Operating profit | — | £28.3k | £21.5k |
| Profit before tax | — | £28.3k | £21.5k |
| Profit after tax | — | £22.9k | £17.4k |
| Profit (best available) | — | £22.9k | £17.4k |
| Employees (average) | 1 | 1 | 0 |
| Ratios | |||
| Profit margin | — | 24% | 33.5% |
| Gross margin | — | 57.6% | 85.6% |
| Revenue per employee | — | £95.4k | — |
| Profit per employee | — | £22.9k | — |
| Growth (year on year) | |||
| Revenue growth | — | — | ▼45.6% |
| Profit growth | — | — | ▼24% |
| Headcount growth | — | 0% | ▼100% |
| Balance sheet — indirect signals, not revenue | |||
| Cash at bank | — | £8.5k | £11.2k |
| Net assets | £24.2k | £24.1k | £18.1k |
| Fixed assets | £24.2k | £19.8k | £16.3k |
| Current assets | £5.9k | £14.6k | £16.5k |
| Debtors | — | £396 | £5.3k |
| Source | FullAccounts · bulk data Dec 2024 | FullAccounts · bulk data Dec 2024 | FullAccounts · bulk data Dec 2025 |
How the business works
- Profit margin
- 33.5%
- Profit ÷ revenue.
- Gross margin
- 85.6%
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- —
- Revenue ÷ average employees.
- Profit per employee
- —
- Profit ÷ average employees.
- Cash conversion
- —
- Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
- Fixed assets ÷ revenue
- 31.3%
- Capital intensity. Low = capital-light, cheaper to start.
- Deferred income ÷ revenue
- —
- Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
- Debtors ÷ revenue
- 10.2%
- Money owed by customers. Low = customers pay quickly.
Balance-sheet signals
Year-on-year changes in filed balance-sheet items. They can hint at momentum (or investment) but are not revenue or profit and must not be read as such.
- Net assets
- ▼25%
- Now £18.1k
- Cash at bank
- ▲32%
- Now £11.2k
- Headcount
- ▼100%
- Now 0
- Deferred income
- —
- Now —
- Fixed assets
- ▼18%
- Now £16.3k
Similar profitable businesses
Sources
Latest figures from FullAccounts for the year to 31 Mar 2025 (profit £17.4k), from the Companies House accounts bulk data published Dec 2025. Spotted an error? Request a correction.
Contains public sector information from Companies House licensed under the Open Government Licence v3.0. Data from Companies House, © Crown copyright. View the licence.