SSI Services (UK) Ltd

What SSI Services (UK) Ltd does

SSI Services (UK) Ltd operates as the specialist contracting arm of South Staffordshire Plc, a publicly listed UK integrated services group headquartered in Walsall, West Midlands. The group is structured as a holding company over two Ofwat-regulated clean water utilities (South Staffs Water serving the West Midlands, South Staffordshire, South Derbyshire, North Warwickshire, and North Worcestershire, and Cambridge Water serving the Cambridge region from Ramsey to Balsham to Melbourn) and a portfolio of twelve wholly-owned non-regulated subsidiary businesses that provide specialist services from design through installation across the water and broader essential services value chain.

The non-regulated subsidiaries deliver complementary capabilities: Advanced Engineering Solutions handles water and gas pipeline and associated asset engineering; G Stow provides borehole drilling and maintenance; Hydrosave specializes in leak detection and technical services; Integrated Water Services offers mechanical and electrical risk mitigation; OnSite maintains water and wastewater essential infrastructure serving water, wastewater, environment, rail, and wider essential services sectors; Omega Red delivers earthing, lightning protection, surge protection, height safety, and EV charging services; Echo Managed Services provides water sector customer service and billing software; Aqua Direct and Office Watercoolers supply bottled water products; and Infrastructure Gateway Ltd operates as the UK's largest independent multi-utility infrastructure provider. The group also markets Net Zero Solutions, a decarbonisation product line supported by a published Net Zero Roadmap.

SSI Services' revenue model combines regulated, recurring water supply revenue (subscription-style) from its two Ofwat-regulated utilities with managed services and contract-based revenue from non-regulated engineering, maintenance, and product businesses serving enterprise B2B customers (water utilities, wastewater operators, rail operators, and essential services operators). Go-to-market is enterprise field sales with direct delivery to essential services operators. Pricing is not publicly disclosed. Headcount is 1,001-5,000 employees and the group reports ESG performance to investors on a quarterly and annual basis. Recent corporate actions include the January 2026 divestiture of IWS Water Hygiene to andwis Group and the June 2026 appointment of Eddie Lundon as Managing Director of OnSite.

Name

SSI Services (UK) Ltd

Legal name

South Staffordshire Plc

Website

https://ssi-services.co.uk

Company type

Public

Founded year

1999

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

SSI Services (UK) Ltd is the specialist contracting arm of South Staffordshire Plc, delivering design-through-installation engineering and infrastructure services across water, gas, rail, and essential services sectors in the UK.

Ownership category

akta.pro rank

Product category

Utility Infrastructure Contracting Services

NAICS

Engineering Services (54133), Architectural, Engineering, and Related Services (5413), Other Computer Related Services (541519)

SIC

Electric, Gas & Sanitary Services (4900), Services-Engineering Services (8711), Electric Services (4911)

akta.pro primary industry

Sanitary Sewer Overflow (SSO) Control & Mitigation (EUANACAE)

Keywords

• Specialist contracting services
• Infrastructure engineering services
• Water pipeline installation
• Utility maintenance services
• Design and installation services

Headquarters

HQ city

Walsall

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Regulated Water Supply: Revenue from two regulated water companies (South Staffs Water and Cambridge Water) providing clean water supply to residential and commercial customers in defined geographic areas under Ofwat regulation
2. Non-Regulated Services: Revenue from complementary non-regulated businesses serving water and adjacent sectors including engineering solutions, leak detection, borehole drilling, M&E services, infrastructure management, earthing/lightning protection/EV charging, billing software, and water supply products

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

SSI Services (UK) Ltd is the specialist contracting arm of South Staffordshire Plc, providing a broad range of specialist services from design through to installation. The company delivers infrastructure engineering, maintenance, leak detection, borehole drilling, mechanical and electrical risk management, and asset management services to water utilities, wastewater operators, the rail sector, and other essential services operators across the UK.

Product overview

SSI Services (UK) Ltd operates as part of South Staffordshire Group, a diversified integrated services company with a platform-plus-subsidiary architecture. The parent company South Staffordshire Plc oversees two regulated water utilities (South Staffs Water and Cambridge Water) and multiple non-regulated service businesses. These subsidiaries provide complementary services across the water sector value chain: Advanced Engineering Solutions handles pipeline engineering; G Stow provides borehole drilling; Hydrosave offers leak detection; Integrated Water Services manages mechanical and electrical risk; OnSite maintains water/wastewater infrastructure; Omega Red delivers earthing, lightning protection, and EV charging; Echo Managed Services provides billing and customer service software; and Aqua Direct/Office Watercoolers supply bottled water. Infrastructure Gateway Ltd serves as a multi-utility infrastructure provider. The Group also offers Net Zero Solutions for decarbonisation. The portfolio spans from regulated utilities to technical services, engineering, software, and water supply products.

Differentiator

Problem solved

Functional benefit

Brands

• South Staffordshire Group: An integrated services group that operates two regulated water companies and complementary non-regulated businesses that serve water and adjacent sectors
• Net Zero Solutions

Products and services

• OnSite Specialist Contracting Services Specialist contracting services maintaining water and wastewater essential infrastructure and assets, serving the water, wastewater, environment, rail and wider essential services sectors. Delivered as the specialist contracting arm of South Staffordshire Plc covering design through to installation.
• Advanced Engineering Solutions (Pipeline Engineering) Specialist engineering services for water and gas pipelines and associated assets, supporting essential services operators with design, installation, and engineering solutions.
• G Stow Borehole Drilling and Maintenance Borehole drilling and maintenance services for the water sector, providing specialist drilling expertise to water utilities and essential services operators.
• Hydrosave Leak Detection and Technical Services Water sector leak detection and technical services helping utilities reduce water loss and maintain network performance.
• Integrated Water Services (M&E) Mechanical and electrical services to mitigate and manage risk from failures in critical water and essential services infrastructure.
• Omega Red Electrical Safety and EV Charging Services Earthing, lightning protection, surge protection, height safety, and EV charging services for infrastructure asset owners.
• Infrastructure Gateway Ltd (IGL) Multi-Utility Infrastructure The UK's largest independent multi utility infrastructure provider, delivering multi-utility infrastructure services to essential services operators.
• Net Zero Solutions Range of products and services to help clients achieve their decarbonisation ambitions, including a published Net Zero Roadmap.

Segments4 records

Ideal customer profiles2 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• andwis GroupminorOthers · 28 January 2026Agreement for sale of IWS Water Hygiene business to andwis Group, a leading provider of technical and compliance services in the UK and parent company of Rock Compliance. This represents a business divestiture rather than a partnership arrangement.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Balfour Beatty Plc: Major UK infrastructure group with water, transportation and energy exposure; broader incumbent competing for large utility framework contracts and AMP8 programs.
• AtkinsRéalis: Global engineering services and project management firm with a significant UK water practice; competes for design, asset management and program management work with utility clients.

Direct peers

• Costain Group Plc: UK engineering solutions provider with a strong water and transportation infrastructure practice; competes for similar utility framework contracts as SSI Services' non-regulated subsidiaries.
• United Utilities Group Plc: Largest listed water company in the UK, serving North West England; comparable as a regulated Ofwat water utility with substantial infrastructure capex programs.
• MWH Treatment: Joint venture specialist delivering water and wastewater treatment infrastructure to UK utilities; comparable contractor profile to OnSite and Advanced Engineering Solutions.
• Anglian Water: Largest geographic water and wastewater operator in England by area, serving East Anglia; comparable regulated water utility with significant leakage and infrastructure capex requirements.
• Severn Trent Plc: FTSE 100 regulated water and wastewater utility operating primarily in the Midlands and Wales; directly comparable to South Staffs Water's regulated franchise and broader regulated/non-regulated operating model.
• Morrison Water Services: Specialist water and wastewater infrastructure services contractor for UK utilities; highly comparable to SSI Services' contracting capabilities across clean and wastewater networks.
• Pennon Group Plc: Owner of South West Water and formerly Viridor waste services; comparable regulated water utility with adjacent non-regulated services exposure.
• Thames Water Utilities: UK's largest water and wastewater company serving London and Thames Valley; comparable as a regulated Ofwat water utility with intensive infrastructure investment needs.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/SSIservicesUK
• LinkedInlinkedin.com/company/ssi-services-ltd

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries12 records

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about SSI Services (UK) Ltd