What SJD Associates does

SJD Associates Ltd (trading as SJD Electrical) is a Milton Keynes-based UK electrical contracting firm incorporated in 1996 by Stephen Devine. The company provides electrical design, installation, and maintenance services, operating as both a specialist subcontractor to main contractors (Vinci Facilities, Parias Construction & Interiors, Ashe Construction, Watson & Cox) and as a principal contractor for larger projects. Its revenue model is project-based, with fixed-price competitive tenders ranging from reactive maintenance jobs to multi-phase programmes of £1.2m-£2.5m, plus a smaller consultancy and design support stream.

SJD serves four primary verticals: healthcare, education, prison/custodial, and main-contractor supply chain work, with secondary exposure to manufacturing and local commercial clients. Specialist technical capabilities include HTM-compliant medical imaging installations (MRI, CT, mammography, X-ray), bespoke anti-ligature trunking and tamper-proof systems for prisons, ATEX-grade intrinsically safe wiring for hazardous manufacturing environments, and intrinsically safe electrical infrastructure for hydrogen production facilities (Cranfield HyPER project, H2 Awards 2023). Certifications include NICEIC Approved Contractor, ECA membership, Trustmark, ConstructionLine Gold, and ECS Gold Card holders; healthcare work is delivered to HTM standards and custodial work to prison security protocols.

The business grew sales from approximately £150k to over £3m over fifteen years under Managing Director Ruth Devine, who joined in 2006 and is now the 112th President of the ECA. Co-Director Darren Hurley (formerly MD of E7 Building Services) invested in 2017 when founder Stephen Devine retired. Headcount is estimated at 20-40, with one in five employees engaged as apprentices. In June 2023 SJD took a £200,000 debt facility from Maven Capital Partners via the Midlands Engine Investment Fund to fund hiring, refurbishment, and new project acquisition.

Name

SJD Associates

Legal name

SJD Associates Ltd

Website

https://sjd-electrical.co.uk

Company type

Private

Founded year

1996

Operating status

Operating

Headcount range

11–50 employees

Short description

SJD Associates (trading as SJD Electrical) is a Milton Keynes-based UK electrical contractor providing specialist design, installation, and maintenance services across healthcare, education, prison, manufacturing, and commercial sectors. The firm delivers full MEP packages to main contractors and acts as principal contractor on larger projects.

Ownership category

akta.pro rank

Headquarters

HQ city

Milton Keynes

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Electrical Design, Installation & Maintenance Services: Project-based electrical services including design, installation and maintenance for commercial, industrial, healthcare, education, prison and manufacturing clients. Revenue is generated through competitive tendering for fixed-price contracts and value-based pricing for complex specialist projects. Includes MEP full packages and principal contractor roles for larger projects.
2. Consultancy and Design Services: Pre-contract consultancy, design development, tender specification support and bid assistance for clients and main contractors. Provided alongside installation services or as standalone consultancy.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels7 records

Core offering

SJD Associates Ltd (trading as SJD Electrical) provides responsive electrical design, installation and maintenance services for commercial, industrial, healthcare, education, custodial, and manufacturing clients in the UK. The company delivers full MEP packages for main contractors, acts as principal contractor for larger projects, and provides specialist electrical infrastructure for prisons, hospitals, hydrogen production, data centres, and ATEX-classified hazardous environments.

Product overview

SJD Associates Ltd (trading as SJD Electrical) is an electrical contracting company offering a comprehensive range of electrical services. The core offering comprises electrical design, installation, and maintenance services delivered as a unified service offering rather than discrete software products. The company provides MEP packages for main contractors and can act as principal contractor for larger projects. Specialist service areas include fire safety infrastructure, hydrogen infrastructure electrical services, ATEX equipment installation, data centre installations, solar panel systems, medical imaging infrastructure, healthcare electrical systems, and prison electrical services. The company also offers bespoke fabrication solutions and consultancy/tender support services.

Differentiator

Problem solved

Functional benefit

Products and services

• Electrical Design Services In-house electrical design services for commercial, industrial, education, healthcare, custodial and manufacturing clients, including full MEP package design and tender specifications for main contractors.
• Electrical Installation Services Complete electrical installation services including power distribution, lighting systems, fire alarm systems, emergency lighting, data cabling and security systems for new builds and refurbishments.
• Electrical Maintenance Services Ongoing planned and reactive maintenance including testing, inspections, fault finding and fast-response services for commercial, industrial, healthcare and manufacturing clients.
• MEP Packages Full mechanical and electrical (MEP) package provision for main contractors on larger construction projects, enabling delivery of integrated building services.
• Principal Contractor Services Acting as principal contractor for larger projects, coordinating all aspects of project delivery including management of sub-contractors.
• Fire Safety Infrastructure Services Specialist fire safety electrical upgrades including fire alarm systems, emergency lighting, smoke detection, fire dampers and high-pressure misting systems, with particular expertise in prison environments.
• Hydrogen Infrastructure Electrical Services Electrical infrastructure design and installation for hydrogen production facilities including intrinsically safe systems, gas detection and high-temperature cabling for innovative energy projects such as the Cranfield University HyPER facility.
• Specialist ATEX Equipment Installation Installation of ATEX-grade explosion-proof equipment including spark-proof switches, anti-explosion lighting and intrinsically safe systems for hazardous areas in manufacturing facilities such as fuel cell plants.
• Data Centre Installation Services Complete electrical infrastructure for data centres including dual power supplies with N+1+1 contingency, server rack installation, climate control systems and UPS systems, delivered to specialist specifications.
• Solar Panel Installation Services Installation of solar panel systems with grid connection capabilities, including systems producing approximately 13kW per building for residential and commercial applications.
• Medical Imaging Electrical Infrastructure Specialist electrical infrastructure for medical imaging facilities including X-ray, MRI, CT scanner and mammography equipment installations compliant with HTM regulations, delivered to manufacturer specifications.
• Healthcare Electrical Infrastructure Electrical installations for healthcare environments including nurse call systems, medical gas systems, bedhead trunking and full compliance with Health Technical Memoranda (HTM) standards, executed in live hospital environments.
• Prison Electrical Services Specialist electrical services for custodial environments including anti-ligature installations, tamper-proof equipment, fire and security improvements and power distribution in live prison settings, delivered by security-vetted electricians.
• Bespoke Fabrication and Manufacturing Solutions Design and fabrication of bespoke aftermarket solutions including custom trunking systems, security cappings and specialised mounting equipment to meet specific project requirements such as anti-ligature prison environments.
• Consultancy and Tender Support Services Pre-contract consultancy support, design development, intrusive surveys and tender specification preparation for clients and main contractors, delivered as a standalone service or alongside installation.

Quantifiable outcome

• Revenue grew from £150k to over £3m in fifteen years under Ruth Devine's leadership
• +4 more outcomes

Named customers15 records

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Nine partnerships are on record, tiered flagship, core and minor.

• Parias Construction & Interiors (PCI)flagshipStrategic or Co-development PartnerLong-term strategic partnership spanning over 10 years with 76+ projects completed and £2.5m total value. PCI consistently engages SJD for healthcare projects including medical imaging, hospital expansions and NHS trust works. Projects include Milton Mouse children's unit at Milton Keynes University Hospital, CT scanners, Lister Hospital A&E expansion, and Circle Health Group hospital upgrades.
• Vinci Construction (Vinci Facilities)coreImplementation/ SI/ Consulting PartnerVinci Facilities has engaged SJD for prison sector electrical projects since 2018, including a £2.5m fire safety infrastructure project at HMP Grendon and £3m+ works at HMP Woodhill (2018-2021). SJD worked as a key contractor on these sensitive custodial projects under Vinci's procurement.
• Ashe ConstructioncoreChannel Partner/ Reseller/ DistributorAshe Construction engages SJD as an electrical subcontractor for education sector projects. Projects include multi-phase M&E upgrades at Sandy Secondary School, a £12m teaching block at Bedford Academy, and various school refurbishments across Bedfordshire.
• Watson & CoxminorChannel Partner/ Reseller/ DistributorWatson & Cox acts as main contractor for Camphill MK accessible housing project, engaging SJD as specialist electrical subcontractor for new accessible homes for adults with learning disabilities and autism.
• KeysourcecoreTechnology or IntegrationKeysource is the data centre specialist that specified and supplied switchgear, standby generator and UPS systems for the Cranfield University data centre project. SJD installed the wiring to Keysource's specification for the data centre's electrical infrastructure.
• GTI EnergyminorStrategic or Co-development PartnerGTI Energy is a partner in the Cranfield University HyPER hydrogen production project. SJD provided specialist electrical infrastructure for this cutting-edge hydrogen research facility. The project has since received approval to scale up to a plant seven times the current size in Chicago.
• Altrad BabcockminorStrategic or Co-development PartnerAltrad Babcock is a partner in the Cranfield University HyPER hydrogen production project. SJD provided specialist electrical infrastructure for the pilot hydrogen production system.
• GE HealthcarecoreTechnology or IntegrationGE Healthcare is the manufacturer of medical imaging equipment (X-ray, mammography systems) installed at Circle Health Group hospitals where SJD provides the electrical infrastructure. SJD's installations must comply with GE Healthcare's exact specifications for safe and compliant medical imaging equipment power supplies.
• FujiFilm (Fuji)coreTechnology or IntegrationFujiFilm is the manufacturer of imaging equipment (Fujifilm FDR visionary imaging system, mammography and ultrasound) installed at Circle Health Group and other hospitals where SJD provides specialist electrical infrastructure. SJD works to FujiFilm's precise specifications.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• TClarke plc: London-listed UK electrical contractor providing design, installation and maintenance across commercial, healthcare and data-centre projects; a larger but directly comparable specialist M&E peer operating in overlapping verticals.
• SES Engineering Services: UK M&E contractor delivering electrical and mechanical packages to main contractors across healthcare, education and commercial builds; closest mid-market analogue to SJD's full MEP subcontracting model.

Broad incumbents

• Balfour Beatty: Major UK infrastructure and construction group whose Vinci/HMP-style custodial and public-sector electrical work overlaps with SJD's prison and NHS tendering; competes indirectly for similar frameworks at much larger scale.
• Morgan Sindall: UK construction and regeneration group active in healthcare, education and public-sector projects where SJD provides specialist electrical subcontracting services.
• Wates Group: UK private construction group with significant education, healthcare and public-sector pipeline where specialist M&E contractors like SJD are engaged as subcontractors.
• Galliford Try: UK construction business with a strong public-sector and education pipeline, comparable end-market exposure to SJD's school and NHS Trust projects.
• NG Bailey: UK's largest independent engineering and M&E services business offering electrical contracting as part of a broader portfolio; relevant incumbent with overlapping healthcare and infrastructure capabilities.
• Bowmer + Kirkland: Privately held UK main contractor delivering commercial, education and healthcare builds with in-house and subcontracted M&E capacity; overlapping main-contractor relationship profile with SJD.
• Imtech Engineering Services (EDF): UK technical services / M&E contractor (now part of EDF) serving commercial, healthcare and infrastructure clients; comparable scale and capability profile as a larger incumbent.
• Skanska UK: Major international contractor's UK arm delivering hospitals, schools and infrastructure projects; relevant incumbent that procures electrical subcontractors similar to SJD's services.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/sjd_electrical
• LinkedInuk.linkedin.com/in/ruthdevine

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds1 record

Investors1 record

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 SJD Associates