What TClarke does

TClarke plc is a UK-based public engineering services company specialising in technology-led building services for complex built-environment projects. Founded in 1889 and headquartered at 30 St Mary Axe, London, the company operates as a building services contractor with 1,001–5,000 employees and a national footprint of thirteen regional offices spanning England and Scotland. TClarke is listed on the London Stock Exchange (ticker: CTO) and is led by CEO Mark Lawrence.

The company's service portfolio comprises three integrated lines — Design and Build, Technology-led Building Services, and full-scope Engineering Services — covering the design, installation, integration, and maintenance of mechanical, electrical, fire safety, and control systems for buildings. Operations are concentrated in three verticals: data centre infrastructure, healthcare facilities (including fire-safety compliance work such as the Tower Block programme at Treliske Hospital), and decarbonisation/energy-efficiency projects. A 2017 acquisition of Eton Associates and a 2010 acquisition of D&S Engineering Facilities indicate a history of bolt-on capability building.

TClarke operates a project-based B2B revenue model, acquiring enterprise contracts through direct sales engagement, tender processes, and framework agreements, with pricing negotiated per project based on scope and complexity. As of 30 June 2023, the company reported a record forward order book of £781 million and guided FY2023 revenue to exceed £500 million for the first time in its history. In July 2023 the company strengthened its balance sheet via an oversubscribed £10.7 million share placing earmarked for growth in London and in the data centre, healthcare, and decarbonisation sectors.

Name

TClarke

Legal name

TClarke plc

Website

https://tclarke.co.uk

Company type

Public

Founded year

1889

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

TClarke plc is a UK-based engineering services contractor delivering technology-led building services — design, build, and systems integration — to enterprise clients in data centres, healthcare facilities, and decarbonisation projects across the United Kingdom.

Ownership category

akta.pro rank

Product category

Building Engineering Services

NAICS

Building Equipment Contractors (2382), Electrical Contractors and Other Wiring Installation Contractors (23821), Specialty Trade Contractors (238)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540)

akta.pro primary industry

Commercial General Contracting (New Build) (IMAFAAAA)

Keywords

• Building services engineering
• Mechanical and electrical contracting
• Data centre infrastructure services
• Healthcare facility engineering
• Decarbonisation building solutions

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices13 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales

Revenue model

1. Engineering Services Contracts: TClarke generates revenue through delivering engineering services on construction and building projects. As a building services company, they secure contracts for design, build, and installation of complex building systems across multiple sectors including data centres, healthcare, and decarbonisation. Revenue is project-based and contract-driven, with a record forward order book of £781 million supporting future revenue visibility.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

TClarke is a UK-based engineering services contractor delivering the complete suite of technology-led building services, spanning design, build, installation, and maintenance of complex mechanical and electrical systems. The firm operates across specialised sectors including data centres, healthcare facilities, and decarbonisation infrastructure, with a UK-wide footprint anchored in London and supported by twelve regional offices.

Product overview

TClarke is a UK-based engineering services company offering a unified portfolio of technology-led building services. The core offering comprises Design and Build services and broader Engineering Services, which work together to deliver integrated solutions for complex building systems. The company operates across multiple sectors including data centres, healthcare, and decarbonisation, providing capabilities in mechanical and electrical engineering, systems integration, and next-generation built environment solutions.

Differentiator

Problem solved

Functional benefit

Products and services

• Design and Build Services

Named customers1 record

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• NG Bailey: The UK's largest independent mechanical and electrical building services contractor. Directly comparable to TClarke in services, vertical mix (data centres, commercial, healthcare), UK geographic focus, and contract-driven revenue model.
• Bowmer + Kirkland: Privately held UK construction and building services contractor of similar size to TClarke, focused on commercial, healthcare and data-driven projects with strong M&E integration — a closely comparable operating model.
• ISG: UK construction services and fit-out specialist competing in commercial, data centre and healthcare building services. Comparable to TClarke in services scope and customer type, though historically more focused on fit-out than pure M&E.

Broad incumbents

• Balfour Beatty: A major UK-listed infrastructure and construction group with a substantial building services and M&E capability that competes with TClarke on data centres and commercial projects, though it operates across a much broader portfolio including civil infrastructure.
• Mace Group: Global consultancy and construction firm headquartered in the UK, providing construction services and building services engineering on large commercial, healthcare and data-driven projects where TClarke also competes.
• Skanska UK: The UK arm of Swedish construction group Skanska, active in commercial building, healthcare and infrastructure. Competes with TClarke on integrated building services delivery but operates as part of a much larger global group.
• Laing O'Rourke: Privately held UK-headquartered construction group with significant M&E and building services capability. Directly competes with TClarke on data centres, healthcare and commercial projects, but is a much larger generalist contractor.
• Kier Group: UK-listed construction and infrastructure services group with a building services and facilities management offering. Overlaps with TClarke in healthcare and public-sector building services but is a much broader infrastructure operator.

Emerging players

• Severfield plc: UK structural steel contractor serving commercial and industrial construction. Adjacent to TClarke's services rather than a direct M&E competitor, but competes on many of the same landmark UK building projects.

Others

• WSP UK Building Services: Global engineering consultancy with a UK building services design practice that often partners with or competes against TClarke on the design-and-build side of complex building projects.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/tc_marklawrence
• Facebookfacebook.com/tclarke-plc-204295089740134
• LinkedInlinkedin.com/company/tclarke

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A2 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about TClarke