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TETRA TECH LIMITED

#01959704 · Active · Incorporated 1985-11-15 (40y 9m) · Last filing 2026-07-06 (1mo ago)
Industrials · SIC 71129 · M Professional, Scientific & Technical Activities · Full accounts
Accounts due 2027-06-30 (in 10 months) · Confirmation due 2026-11-29 (in 3 months) · No watchouts on the register

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Cash

£471k

lowest in 3 filed years

Net assets

£64m

Equity attributable

Employees

975

highest in 3 filed years

Profit before tax

£19m

Period ending 2025-09-28

Accounts

3-year trend · Δ = latest vs prior filed period · latest reflected 2025-09-28

Metric Trend 2023-10-012024-09-292025-09-28 Δ vs prior
Turnover £109,956,000£115,497,000£126,478,000 —
Operating profit £10,937,000£15,528,000£18,684,000 —
Profit before tax £10,937,000£15,528,000£18,684,000 —
Net profit £10,512,000£14,479,000£13,402,000 —
Cash £580,000£3,511,000£471,000 —
Total assets less current liabilities £59,621,000£73,655,000£67,929,000 —
Net assets £56,199,000£70,843,000£64,425,000 —
Equity £56,199,000£70,843,000£64,425,000 —
Average employees 882885975 —
Wages £41,832,000£46,732,000£52,118,000 —
Directors' remuneration £0£0£0 —

Values shown as filed in the company's annual accounts. — indicates the figure wasn't present under that line item in that period. The Δ column is the change from the prior filed period as a percentage of |prior|; lines a company doesn't report show —. Year-on-year comparison hidden: this filing covers about 12 months versus 12 months prior. About these numbers

Ratios

Computed from the line items above — sparklines read oldest → newest

Ratio Trend 2023-10-012024-09-292025-09-28
Operating margin 9.9%13.4%14.8%
Net margin 9.6%12.5%10.6%
Return on capital employed 18.3%21.1%27.5%
Gearing (liabilities / total assets) —30.0%36.5%
Current ratio 3.26x3.65x3.01x

Margins divide P&L lines by turnover. Gearing is liabilities over total assets. Current ratio is current assets over creditors falling due within one year. Interest cover is operating profit over absolute finance costs. Sector-distribution context coming next.

Name history

Renamed 5 times since incorporation

  1. TETRA TECH LIMITED 2020-12-30 → present
  2. WYG ENGINEERING LIMITED 2008-07-01 → 2020-12-30
  3. WHITE YOUNG GREEN CONSULTING LIMITED 1998-01-05 → 2008-07-01
  4. WHITE YOUNG CONSULTING GROUP LIMITED 1986-02-07 → 1998-01-05
  5. WHITE YOUNG LIMITED 1985-12-20 → 1986-02-07
  6. BROXMILL LIMITED 1985-11-15 → 1985-12-20

Audit & accounting basis

Accounting basis
FRS 102
Reporting scope
Standalone (parent only)
Auditor
Armstrong Watson Audit Limited
Audit opinion
Unqualified (clean)
Going concern
Affirmed

“As set out in note 3 of the financial statements, the directors are of the opinion that the Company has adequate resources to continue in operational existence for the foreseeable future. The financial statements have, therefore, been prepared on a going concern basis.”

Group structure

  1. TETRA TECH LIMITED · parent
    1. White Young Green Limited 100% · England · Dormant
    2. Trench Farrow Limited 100% · England · Dormant
    3. Tetra Tech Consulting (NI) Limited 100% · Northern Ireland · Consultant to the built and natural environment
    4. Tetra Tech Consulting Ireland Limited 100% · Ireland · Consultant to the built and natural environment

Significant events

Auditor, going-concern and subsidiary information is drawn from the narrative of the latest annual accounts. About these numbers

People

3 active · 69 resigned

Name Role Appointed Born Nationality
MURDOCH, Andrew James Secretary 2025-04-14 — —
GILLESPIE, Andrew James Director 2010-10-14 May 1969 British
HATCH, David Craig Director 2020-10-22 Nov 1964 British
Show 69 resigned officers
Name Role Appointed Resigned
ARBER, Gareth George Secretary 2010-11-25 2025-04-14
CONNERY, Denis Patrick Secretary 2006-07-01 2008-11-05
FARBRIDGE, Caroline Louise Secretary 2008-11-05 2010-10-15
HAGUES, Ian James Secretary 1997-07-18 1999-05-04
HALL, Lawrence Derek Secretary — 1997-07-18
HARTLEY, Robert Secretary 1999-05-04 2006-07-01
WHITWORTH, Benjamin Warwick Secretary 2011-05-03 2019-10-31
ADAMS, Robin William Director 2006-11-10 2008-07-01
ADDISON, Keith Robert Director 2002-07-01 2008-07-01
ALLEN, Richard Anthony Director 2010-12-01 2012-03-15
ANDERSON, Clive Drummond Director 2003-07-01 2007-11-06
ARCHIBALD, Kenneth Nisbet Director 1998-05-12 2004-07-01
BRAYSON, William Richard Director — 2003-12-17
BUTLER, Barrington Jeffrey Kerwin Director 1999-10-06 2002-07-01
COACKLEY, Richard James Director 2006-07-01 2009-03-23
CONNERY, Denis Patrick Director 2004-01-01 2008-11-05
CRICHTON-MILLER, David James Laurens Director 2010-01-22 2010-11-01
DEAN, Michael John Director 1997-07-21 2008-07-01
DEASY, John Vincent Director 2002-07-01 2008-05-21
DODDS, Andrew Director 2004-07-01 2008-07-01
DOWNIE, Philip Charles George Director 1999-04-01 2004-01-01
ELLINGWORTH, Andrew Director 2006-07-01 2007-11-06
ELLYATT, David Paul Director 1992-12-15 2007-07-31
EVERALL, Terry Richard Director 1998-01-01 2008-07-01
FORD, Douglas Moncrieff Director 1998-01-01 2008-07-01
FULLER, Richard Anthony Director 2006-07-01 2008-07-01
HAGUES, Ian James Director 1997-07-18 1999-05-04
HAMER, Paul Christopher Director 2008-07-01 2010-12-13
HARE, Richard Timothy Director 2003-03-01 2012-03-07
HARTLEY, Robert Director 1999-05-04 2009-04-14
HAYNES, Lawrence John Director 2007-06-18 2009-01-05
HIGGS, Alan John Director — 2002-04-30
HOLDEN, Timothy Arthur Director 2014-04-01 2016-11-23
JACKSON, Mark Edward Director 2019-10-28 2020-10-22
JENKINS, John William Director 2009-01-01 2009-12-07
JENKINS, John William Director 2001-07-01 2008-07-01
JONES, Philip David Director 2004-07-01 2009-03-23
KARA, Hanif Mohamed, Professor Director 2006-11-10 2008-07-01
KERSHAW, David Michael Director 2010-12-01 2012-03-05
KIERNAN, Peter Hartley Director 2004-01-01 2008-07-01
KIPPAX, Alan Director — 1998-06-30
LAX, Noel Geoffrey Director 2006-10-30 2012-05-21
MARSHALL, Paul Andrew Director 2006-07-17 2009-03-23
MARTIN, Simon Director 2006-07-01 2008-07-01
MCCAFFREY, Richard George, Mr. Director 2000-07-03 2008-01-24
MORRIS, Clive Lee Director 2002-03-01 2005-07-01
OLVER, Graham Dudley Director 2009-08-03 2014-01-01
PROCTER, Michael John Director 2000-01-04 2008-07-01
PURVIS, John George Director 1992-12-15 2007-09-17
RIVETT, John Martin Director 1997-07-21 2000-01-04
ROGERS, Jonathan Grant Director 2005-01-01 2008-07-01
SCOTT, James Alexander Director 2004-07-01 2008-07-01
SLOTA, Robert Emilion Director 2002-03-01 2008-07-01
TAYLOR, David Charles Director 2004-07-01 2006-08-10
TAYLOR, Michael Leonard Director 1997-07-21 2007-03-31
THOMSON, Neil Director 2004-07-01 2007-02-28
THORN, Glen Director 2012-03-05 2013-11-16
TOWNEND, Jeanne Carroll Director 2016-12-05 2018-01-15
WALSH, Terence Geoffrey Director 1993-06-30 1996-12-31
WHITING, Walter Leonard Director — 1992-12-31
WHITTAKER, John David Director 2004-01-01 2008-07-01
WHITWELL, Michael John Director 1997-07-21 2006-10-31
WHITWORTH, Benjamin Warwick Director 2018-01-15 2019-10-31
WHITWORTH, Benjamin Warwick Director 2016-11-23 2016-12-05
WILLIAMSON TAYLOR, Albert Olumuyiwa Director 2006-11-10 2008-07-01
WILSON, Terence Benson Director 1999-10-06 2004-12-01
WILTON, David Charles Director 2009-02-10 2010-12-13
WINTER, Sidney Keith, Dr Director 1992-12-15 2006-07-01
ZUKOWSKI, Elizabeth Lina Director 2005-07-25 2008-07-01

Ownership

Persons with significant control

Name Kind Nature of control Notified Status
Tetra Tech Group Limited Corporate entity Shares 75–100% 2016-04-06 Active

Filing timeline

Last 20 of 372 total filings

Material constitutional events — rename, articles re-file, resolution

  • 2021-04-21 RESOLUTIONS Resolution
Date Type Category Description
2026-07-06 AA accounts Accounts with accounts type full
2026-05-14 MR04 mortgage Mortgage satisfy charge full PDF
2025-11-21 CS01 confirmation-statement Confirmation statement with no updates PDF
2025-07-01 AA accounts Accounts with accounts type full
2025-04-15 AP03 officers Appoint person secretary company with name date PDF
2025-04-15 TM02 officers Termination secretary company with name termination date PDF
2024-11-26 CS01 confirmation-statement Confirmation statement with no updates PDF
2024-07-05 AA accounts Accounts with accounts type full
2023-11-29 CS01 confirmation-statement Confirmation statement with no updates PDF
2023-07-07 AA accounts Accounts with accounts type full
2022-12-05 CS01 confirmation-statement Confirmation statement with no updates PDF
2022-08-12 AA accounts Accounts with accounts type full
2021-11-26 CS01 confirmation-statement Confirmation statement with updates PDF
2021-10-08 AA accounts Accounts with accounts type full
2021-04-21 SH19 capital Capital statement capital company with date currency figure
2021-04-21 SH20 capital Legacy
2021-04-21 CAP-SS insolvency Legacy
2021-04-21 RESOLUTIONS resolution Resolution
2021-04-08 SH01 capital Capital allotment shares PDF
2021-03-17 PSC05 persons-with-significant-control Change to a person with significant control PDF

Public-record activity

Raw counts from Companies House — last 12–24 months

Filings
3

last 12 months

Capital events
0

last 24 months

Officers appointed
0

last 12 months

Officers resigned
0

last 12 months

Direct counts from the register. No score, no rating — see the Filing timeline for the underlying events.

Official Companies House page