Electrical Contracting Solutions

The highest standards of service throughout with high quality testing and inspection procedures


Welcome to the website of SWI Ltd Electrical Contractors based in Hertfordshire.SWI has a proven track record for establishing and maintaining quality within the electrical installation industry. The wealth of experience contained within the close pool of fully trained staff has been developed over many years of contracting in some of the Capitals most prestigious Blue Chip Companies.

We provide a full range of managed services to clients throughout the South East and could provide the answer to your company’s electrical needs.  From inception – design consultancy, through to professional mechanical and electrical installation – to ensuring consistency and continued performance with high level maintenance.


Our reputation as a reliable electrical contractor continues to be recognised due to our trustworthy and professional electrical services.Our accreditation with the N.I.C.E.I.C Approved contractor installer scheme is testimony to our hard work and professionalism. We pride ourselves on our eye for detail, ensuring quality, safety and high level customer service.  Evidence of which is through continued support from existing clients.

SWI Services Portfolio

Electrical services for your business needs.


SWI provide the highest standards of service throughout with high quality testing and inspection procedures allowing us to offer a full range of Electrical services for your business. We provide a wide range of electrical services including

  • Package substations
  • Emergency power generation
  • Lighting
  • Low voltage mains distribution
  • Security systems
  • Access control systems
  • Voice,data,and BMS networks Including fibre optic cabling
  • Fire Alarm Systems

All our electrical services exceeds and adheres to current industry regulations. For our full range of services, and to contact us regarding your requirements, visit our services page . To read about our current contracts and read client testimonials, visit our case studies section.

Company News

SWI New HQ Offices

We have recently found the need to expand due to business demands and are pleased to now have a head office in Bishops Stortford, Hertfordshire. This enables us to have a hands on approach with our clients in the immediate area.

About Company

SWI has developed a very close and mutually beneficial relationship with the worlds largest pharmaceutical company. This has allowed SWI to develop high quality testing and inspection procedures, enabling the highest standards of service throughout the installation schedule.

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Our Standards

We are a full member of the National Inspection Council for Electrical Installation Contractors - N.I.C.E.I.C. It's the industry standards body and they inspect us very thoroughly every year, so you can be sure that every job we do is to the highest standards. Click here to read more about our H&S Policies.

Current Projects

Fire Alarm Replacement and Fire Compartmentation Upgrade Works at World Leading Pharmaceutical Company

This project also incorporated the upgrade of all the fire barriers within the buildings including, HVAC fire dampers service or replacements, fire stopping of compartment walls, upgrade and sign off of all fire doors, Installation of upgraded fire protection glazed partitioning.

Get in Touch

  • Phone:
    +44 (0) 1279 865884
  • Email:
  • Address:

    Unit 15 Twyford Business Centre
    London Road, Bishops Stortford
    Herts, CM23 3YT