HSL Compliance Ltd
Registered name: HSL COMPLIANCE LTD
Part of Mariner Topco Limited groupHSL Compliance Ltd made £28.7m revenue and £3.2m profit in the year to 31 Dec 2024.
HSL Compliance Ltd’s revenue grew 8% to £28.7m in the year to 31 Dec 2024, with £3.2m profit and 347 employees. The company is classified under “water collection, treatment and supply” and is based in Ross-on-Wye; we hold 3 years of its filed accounts.
- Status
- Active
- Location
- Ross-on-Wye
- Age
- 37 yrs · since 1989
- Type
- Private Limited Company
Key figures
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) | £22.3m | £26.7m | £28.7m |
| Cost of sales | −£14.7m | −£17.9m | −£18.7m |
| Gross profit | £7.6m | £8.8m | £10.1m |
| Operating profit | £1.4m | £1.6m | £3.2m |
| Profit before tax | £1.7m | £2.2m | £3.8m |
| Profit after tax | £1.6m | £2m | £3.2m |
| Profit (best available) | £1.6m | £2m | £3.2m |
| Employees (average) | 327 | 335 | 347 |
| Ratios | |||
| Profit margin | 7.2% | 7.5% | 11.2% |
| Gross margin | 34.1% | 32.8% | 35.1% |
| Revenue per employee | £68.3k | £79.7k | £82.8k |
| Profit per employee | £4.9k | £6k | £9.3k |
| Growth (year on year) | |||
| Revenue growth | — | ▲19.6% | ▲7.6% |
| Profit growth | — | ▲25.3% | ▲60.7% |
| Headcount growth | — | ▲2.5% | ▲3.6% |
| Balance sheet — indirect signals, not revenue | |||
| Net assets | — | — | — |
| Source | Accounts · bulk data Oct 2024 | Accounts · bulk data Oct 2024 | Accounts · bulk data Oct 2025 |
How the business works
- Profit margin
- 11.2%
- Profit ÷ revenue.
- Gross margin
- 35.1%
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- £82.8k
- Revenue ÷ average employees.
- Profit per employee
- £9.3k
- 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 347
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Ownership chain
- Mariner Topco Limitedultimate parent75–100%
- Mariner Midco 1 Limited75–100%
- Mariner Midco 2 Limited75–100%
- Mariner Bidco Limited75–100%
- HSL Compliance Group Limited75–100%
- HSL Compliance Holdings Limited75–100%
- HSL Compliance Ltdthis company
Bands show the share of ownership each company holds in the one below it.
Subsidiaries (1)
- HSL Compliance (Scotland) LtdFigures not disclosed
Sister companies (16)
- Albanyoak LimitedFigures not disclosed
- Apc Compliance LimitedRev. — · Profit £182k
- Coral Environmental LtdFigures not disclosed
- Crosmill Holdings LtdRev. — · Profit £987k
- Houseman Environmental LimitedRev. — · Profit £507k
- HSL Compliance (Northern Ireland) LimitedFigures not disclosed
- HSL Compliance Advanced Water Technologies LtdRev. — · Profit £704k
- HSL Compliance Enitial LtdFigures not disclosed
- HSL Inspection and Testing LtdFigures not disclosed
- Ice Plumbing & Water Services LimitedFigures not disclosed
- Jordan Environmental LimitedFigures not disclosed
- Legionella Control International LimitedFigures not disclosed
- Plexus Innovation LimitedRev. — · Profit £289k
- R J Urmson Group LimitedRev. — · Profit £650k
- Saferspaces LimitedFigures not disclosed
- Treatment 4 Water LimitedFigures not disclosed
From the Persons with Significant Control register (corporate controllers only).
Sources
Latest figures from accounts for the year to 31 Dec 2024 (profit £3.2m), from the Companies House accounts bulk data published Oct 2025. Spotted an error? Request a correction.
Updated from Companies House on 21 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.