Tetra Tech Environmental Management Limited
Registered name: TETRA TECH ENVIRONMENTAL MANAGEMENT LIMITED
Part of Tetra Tech, Inc. groupTetra Tech Environmental Management Limited made £86.6m revenue and £7m profit in the year to 28 Sep 2025.
Tetra Tech Environmental Management Limited’s revenue grew 24% to £86.6m in the year to 28 Sep 2025, with £7m profit and 1,000 employees. The company is classified under “other engineering activities” and is based in Abingdon; we hold 4 years of its filed accounts.
- Status
- Active
- Location
- Abingdon
- Age
- 43 yrs · since 1983
- Type
- Private Limited Company
Key figures
Financial history
| Year to | 29 Sep 2023 | 28 Sep 2024 | 29 Sep 2024 | 28 Sep 2025 |
|---|---|---|---|---|
| Disclosure | Full P&L | Full P&L | Full P&L | Full P&L |
| Profit & loss | ||||
| Revenue (turnover) | £46.4m | £69.8m | £69.8m | £86.6m |
| Cost of sales | −£30.6m | −£30.1m | −£30.1m | −£39m |
| Gross profit | £15.8m | £39.6m | £39.6m | £47.5m |
| Operating profit | £895k | £6.1m | £6.1m | £9.9m |
| Profit before tax | £876k | £6.1m | £6.1m | £9.9m |
| Profit after tax | £1.1m | £3.8m | £3.8m | £7m |
| Profit (best available) | £1.1m | £3.8m | £3.8m | £7m |
| Employees (average) | 912 | 965 | 965 | 1,000 |
| Ratios | ||||
| Profit margin | 2.4% | 5.4% | 5.4% | 8% |
| Gross margin | 34% | 56.8% | 56.8% | 54.9% |
| Revenue per employee | £50.8k | £72.3k | £72.3k | £86.6k |
| Profit per employee | £1.2k | £3.9k | £3.9k | £7k |
| Growth (year on year) | ||||
| Revenue growth | — | — | — | ▲24.1% |
| Profit growth | — | — | — | ▲84.7% |
| Headcount growth | — | — | — | ▲3.6% |
| Balance sheet — indirect signals, not revenue | ||||
| Net assets | — | — | — | — |
| Source | Accounts · bulk data May 2025 | Accounts · bulk data Apr 2026 | Accounts · bulk data May 2025 | Accounts · bulk data Apr 2026 |
How the business works
- Profit margin
- 8%
- Profit ÷ revenue.
- Gross margin
- 54.9%
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- £86.6k
- Revenue ÷ average employees.
- Profit per employee
- £7k
- 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 1,000
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Ownership chain
- Tetra Tech, Inc. (registered outside the UK register)ultimate parent75–100%
- Tetra Tech UK Holdings Limited75–100%
- R P S Group Limited75–100%
- Tetra Tech Environmental Management Limitedthis company
Bands show the share of ownership each company holds in the one below it.
Sister companies (4)
- Tetra Tech RPS Energy Consultants LimitedRev. £13.8m · Profit £289k
- Ecl Group LimitedFigures not disclosed
- Tetra Tech Consulting LimitedFigures not disclosed
- Tetra Tech RPS Energy LimitedFigures not disclosed
From the Persons with Significant Control register (corporate controllers only).
Sources
Latest figures from accounts for the year to 28 Sep 2025 (profit £7m), from the Companies House accounts bulk data published Apr 2026. Spotted an error? Request a correction.
Updated from Companies House on 23 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.