Costain Ltd

Large enterpriseConstruction workUK · LondonCompany No. 00610201

Costain Ltd is a UK limited company, based in London, incorporated in 1958. Has won 131 UK public-sector contracts worth £4.6bn across 41 buyers, primarily National Highways and construction work work.

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Active contracts

▲ 2 new awards (30d)

Contracted (12m)

£1.1bn

▲ 15551% vs prior 12m

Framework headroom (12m)

£305.1m

▼ 25% vs prior 12m

Public buyers

stable this month

Top buyer share

41%

National Highways

Buyer concentration

Each block sized by share of total award value. A dominant block signals dependency on one buyer.

High concentration. Top 3 buyers = 77% of revenue.

National Highways

£1.9bn

41%

Sellafield Ltd

£981.7m

21%

Transport for London

£700.8m

15%

HS2

£408.6m

National Highways Limited

£297.2m

Title	Buyer	Award type	Value	Awarded	Status
Infrastructure Delivery Partnership (IDP)	Sellafield Ltd	Shared contract	£981.7m lot total · 3 suppliers	10 Oct 2025	active
Infrastructure Improvement Framework	Transport for London	Framework call off	£700.0m ceiling · ~£233.3m share (÷3)	22 Apr 2026	pending
Smart Motorways Alliance	National Highways	Shared contract	£642.9m lot total · 7 suppliers	12 May 2020	active
Delivery Integration Partnership (DIP)	National Highways	Framework call off	£580.0m ceiling · ~£38.7m share (÷15)	19 Nov 2018	expired
HS2 Limited Tunnel and Lineside Mechanical and Electrical Systems	HS2	Framework call off	£408.5m ceiling · ~£408.5m share	06 Jan 2025	active
A30 Chiverton to Carland Cross	National Highways	Direct contract	£368.2m	31 Mar 2020	expired
Smart Motorways Programme - M6 J21a-26 Delivery Partner	National Highways	Direct contract	£156.4m	29 May 2018	expired
SMA: M6 J21a-26	National Highways Limited	Direct contract	£131.6m	11 Sept 2020	active
M5 Bridgwater	National Highways Limited	Direct contract	£123.0m	21 Jan 2026	active
Preston Western Distributor Road & North West Preston East West Link Road	Lancashire County Council	Framework call off	£110.0m ceiling · ~£110.0m share	18 Jan 2016	expired
LPS CAS - Lancaster South Growth Catalyst Highway Infrastructure Early Supplier Involvement - RFQ 15301428	Lancashire County Council	Framework call off	£100.0m ceiling · ~£100.0m share	12 Jan 2022	active
M60 J18 Simister Island	National Highways	Direct contract	£94.3m	14 Apr 2021	active
Reactor Buildings Height Reduction (EXECUTION phase)	Nuclear Restoration Services Ltd	Framework call off	£71.8m ceiling · ~£71.8m share	02 Oct 2025	active
Area 4 Asset Delivery Construction Works Framework (Area 4 Interim) Contract	National Highways	Direct contract	£50.0m	06 Aug 2020	expired
M62 J25-30 Dynamic Hard Shoulder PCF Stages 4-7	National Highways Limited	Direct contract	£37.4m	30 Jun 2021	expired

Costain Ltd

Buyer concentration

Contracts won · 131 total · 48 active · 79 expired

Top buyers · by total award value

Award value — last 8 quarters

Category mix — CPV divisions

Geographic spread

Modifications received · scope growth on existing wins

Compliance scorecard

Financial health

Company information

Corporate structure

Companies House data

Peer suppliers

News mentions

Compliance scorecard

Financial health

Company information

Corporate structure

Costain Ltd

Companies House data

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