Sustainable Drainage Systems Limited
Registered name: SUSTAINABLE DRAINAGE SYSTEMS LIMITED
Part of SDS Holdings Limited groupSustainable Drainage Systems Limited made £35.5m revenue and £3.8m profit in the year to 31 Dec 2024.
Sustainable Drainage Systems Limited’s revenue grew 2% to £35.5m in the year to 31 Dec 2024, with £3.8m profit and 159 employees. The company is classified under “manufacture of plastic plates, sheets, tubes and profiles” and is based in Biddisham; we hold 3 years of its filed accounts.
- Status
- Active
- Location
- Biddisham, South West
- Age
- 24 yrs · since 2002
- Type
- Private Limited Company
Part of a group. The filing indicates this company sits within a group structure, so its results may depend on intra-group trading and it may be hard to replicate independently. From the filing: “SDS Water Group Limited”
Key figures
Badges are automated estimates derived from the filed figures — not statements of fact about the company.
Financial history
| Year to | 31 Dec 2022 | 31 Dec 2023 | 31 Dec 2024 |
|---|---|---|---|
| Disclosure | Full P&L | Full P&L | Full P&L |
| Profit & loss | |||
| Revenue (turnover) | £39.1m | £34.8m | £35.5m |
| Cost of sales | £23.3m | £20.1m | −£21.3m |
| Gross profit | £15.8m | £14.7m | £14.2m |
| Operating profit | £7.9m | £6m | £5.1m |
| Profit before tax | £7.7m | £5.8m | £5m |
| Profit after tax | £7.1m | £4.8m | £3.8m |
| Profit (best available) | £7.1m | £4.8m | £3.8m |
| Staff costs | £6m | £6.1m | — |
| Employees (average) | 161 | 153 | 159 |
| Ratios | |||
| Profit margin | 18.2% | 13.8% | 10.7% |
| Gross margin | 40.4% | 42.3% | 40% |
| Revenue per employee | £243k | £228k | £224k |
| Profit per employee | £44.3k | £31.3k | £23.9k |
| Growth (year on year) | |||
| Revenue growth | — | ▼11.1% | ▲2.1% |
| Profit growth | — | ▼32.8% | ▼20.7% |
| Headcount growth | — | ▼5% | ▲3.9% |
| Balance sheet — indirect signals, not revenue | |||
| Cash at bank | £1.3m | £2.9m | — |
| Net assets | £11.2m | £11m | — |
| Fixed assets | £5.7m | £4.8m | — |
| Current assets | £16.1m | £16.5m | — |
| Debtors | £6m | £6m | — |
| Source | FullAccounts · bulk data Sep 2024 | FullAccounts · bulk data Sep 2024 | Accounts · bulk data Oct 2025 |
How the business works
- Profit margin
- 10.7%
- Profit ÷ revenue.
- Gross margin
- 40%
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- £224k
- Revenue ÷ average employees.
- Profit per employee
- £23.9k
- Profit ÷ average employees.
- Cash conversion
- —
- Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
- Fixed assets ÷ revenue
- —
- Capital intensity. Low = capital-light, cheaper to start.
- Deferred income ÷ revenue
- —
- Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
- Debtors ÷ revenue
- —
- 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
- —
- Now —
- Cash at bank
- —
- Now —
- Headcount
- ▲4%
- Now 159
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Ownership chain
- SDS Holdings Limitedultimate parent75–100%
- SDS Water Group Limited75–100%
- Sustainable Drainage Systems Limitedthis company
Bands show the share of ownership each company holds in the one below it.
Sister companies (1)
- SDS Pipe Systems (Holdings) LimitedFigures not disclosed
From the Persons with Significant Control register (corporate controllers only).
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Sources
Latest figures from accounts for the year to 31 Dec 2024 (profit £3.8m), from the Companies House accounts bulk data published Oct 2025. Spotted an error? Request a correction.
Updated from Companies House on 24 Oct 2026
Contains public sector information from Companies House licensed under the Open Government Licence v3.0. Data from Companies House, © Crown copyright. View the licence.