COSTAIN LIMITED

1. COSTAIN LIMITED 1999-06-24 → present
2. COSTAIN CIVIL ENGINEERING LIMITED 1958-08-25 → 1999-06-24

Values shown as filed in the company's annual accounts. — indicates the figure wasn't present under that line item in that period. About these numbers

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.

Accounting basis

FRS 101

Reporting scope

Standalone (parent only)

Auditor

PricewaterhouseCoopers LLP

Audit opinion

Unqualified (clean)

Going concern

Affirmed

“Based on the work we have performed, we have not identified any material uncertainties relating to events or conditions that, individually or collectively, may cast significant doubt on the company's ability to continue as a going concern for a period of at least twelve months from when the financial statements are authorised for issue. In auditing the financial statements, we have concluded that the directors' use of the going concern basis of accounting in the preparation of the financial statements is appropriate.”

Group structure

1. COSTAIN LIMITED · parent
   1. Costain Integrated Technology Solutions Limited 1% · England · Technology Integration
   2. Costain Integrated Services Limited 1% · England · Professional services
   3. Calvert & Russell Limited 1% · England · Dormant
   4. Construction Study Centre Limited 1% · England · Dormant
   5. Costain Upstream Limited 1% · Scotland · Engineering and design services
   6. Brunswick Infrastructure Services Limited 0% · England
   7. Promanex (Civils & Industrial Services) Limited 0% · England
   8. Promanex (Construction & Maintenance Services) Limited 0% · England
   9. Promanex (Total FM & Environmental Services) Limited 0% · England

Significant events

• “We are encouraged by the UK Government's 10-year Infrastructure Strategy and Infrastructure Pipeline, which sets out plans to increase investment in Transport (excluding HS2) in the medium term, notably in local, regional and devolved transport (such as the Northern Powerhouse Rail, East West Rail schemes and regional road infrastructure), together with the regulatory commitments and major expansion plans that will increase investment in the aviation sector.”
• “In January 2026, we announced the award of a contract to design and build a new junction on the M5 in Somerset to provide access to the planned Agratas factory, which will be Britain's biggest electric vehicle battery manufacturing facility.”
• “in June 2025, we announced a five-year extension to our Strategic Pipeline Alliance contract with Anglian Water to improve resilience to drought and climate change by transferring water from wetter regions to drier parts of the east of England.”
• “In October, we announced the award of a major delivery partnership contract with Sellafield, worth up to £1bn over 15 years, to deliver critical utilities infrastructure upgrades, thereby extending a relationship that began in 2005.”
• “In March, we added Urenco as a new customer, securing a programme delivery partner framework to deliver new and upgraded infrastructure at its Cheshire site and then an additional design services FEED for Europe's first commercial scale high-assay low-enriched uranium facility.”

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

Filings

8

last 12 months

Capital events

0

last 24 months

Officers appointed

1

last 12 months

Officers resigned

2

last 12 months

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

• Turnover

  -16.7%

  £1,217,216,000 → £1,013,547,000

• Cash

  -0.5%

  £69,358,000 → £68,983,000

• Net assets

  +18.5%

  £129,577,000 → £153,539,000

• Employees

  -3.6%

  2,754 → 2,656

• Operating profit

  +421.4%

  £4,783,000 → £24,940,000

• Profit before tax

  +86.4%

  £14,613,000 → £27,243,000

• Wages

  +1.2%

  £202,949,000 → £205,325,000

Each % is (latest − prior) ÷ |prior| for the line item as filed. The comparison is only shown when the latest and prior accounts cover broadly equal-length periods — short or long stubs (typical around incorporation or a year-end change) are suppressed rather than misrepresented. Lines a company doesn't report are omitted. About these numbers