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Expert Electrical & Solar Solutions in Northampton
With over three decades of expertise, 3S Northampton has established itself as a trusted name in electrical contracting, commercial fit-outs, and solar energy solutions. Founded as a family venture and now spanning generations, we combine technical excellence with a client-centric approach to deliver tailored services across the UK. Our team of certified professionals specialises in electrical installations, energy-efficient lighting, and solar PV systems, ensuring compliance with the highest safety standards.

We prioritise innovation, investing in cutting-edge technologies to future-proof our clients' operations while maintaining a commitment to sustainability. Our reputation is built on reliability, with a track record of completing projects on time and within budget, supported by accreditations from leading industry bodies. By fostering long-term relationships, we provide ongoing support through maintenance and testing services, ensuring systems remain efficient and compliant throughout their lifecycle.
Services
Commercial Solar PV Data Cabling LED Lighting Electrical Testing Office Fit-Outs Warehouse Refurbishment Fibre Optic Cabling Emergency Lighting Power Systems Building Strip-Out
Highlights and features
  • Over 30 years of industry experience delivering electrical and solar projects
  • Tailored solutions designed to meet specific business requirements
  • NICEIC-accredited installations ensuring compliance with UK safety standards
  • Flexible working hours to minimise disruption to client operations
  • Commitment to quality demonstrated through project warranties and testing
Associations and certifications
  • NICEIC Approved Contractor
What people say
Exceptional work quality Jobs run smoothly Fantastic partner Second to none service Value for money
Services
Commercial Solar PV
Our commercial solar PV systems reduce energy costs while enhancing sustainability. Designed for businesses of all sizes, these systems integrate seamlessly with existing electrical infrastructure. With options including Power Purchase Agreements and full ownership models, we provide complete solar solutions from design to maintenance. Systems typically achieve 80% energy savings compared to traditional sources.
Electrical Testing
We conduct comprehensive electrical testing including EICRs and PAT testing to ensure compliance with UK regulations. Our NICEIC-certified engineers identify potential hazards and provide detailed reports with remedial recommendations. Testing frequencies are tailored to property types, with commercial installations requiring inspection every five years as standard.
Data Cabling
Our structured data cabling solutions support high-speed networks for businesses. Specialising in Cat6a and fibre optic installations, we ensure reliable connectivity for offices and industrial facilities. All installations include testing and certification to guarantee performance standards, with options for network upgrades and maintenance contracts available.
Office Fit-Outs
We deliver complete office fit-out projects incorporating electrical systems, lighting upgrades, and partitioning. Our approach balances functionality with aesthetic design while maintaining compliance with safety regulations. Projects include Cat A shell-and-core installations and custom Cat B interior finishes tailored to business requirements.
LED Lighting
Our LED lighting solutions reduce energy consumption by up to 80% while improving illumination quality. We provide lighting audits to identify savings opportunities and install systems with 10-year warranties. Services include emergency lighting upgrades, exterior security lighting, and smart control systems for enhanced energy management.
People
Steven Marks
CEO
With over 30 years in the electrical contracting industry, Steven leads strategic operations at 3S Northampton. He oversees project delivery while maintaining client relationships, ensuring the company's continued growth and commitment to quality standards.
Lara Smith
CTO
As Chief Technology Officer, Lara drives innovation in electrical and solar technologies. She specialises in integrating energy-efficient systems with existing infrastructure, ensuring clients benefit from the latest advancements in sustainable power solutions.
John Doe
COO
John manages day-to-day operations across all service divisions. With extensive experience in project management, he ensures timely delivery of electrical installations, fit-outs, and solar projects while maintaining compliance with industry regulations.
Mike Rich
Lead Architect
Mike specialises in commercial building design and space optimisation. He leads fit-out projects from concept to completion, creating functional environments that balance aesthetic appeal with practical electrical and mechanical requirements.
Jenny Smith
Head Engineer (US)
Jenny oversees engineering operations for international projects. With expertise in electrical systems design, she ensures all installations meet both UK and international safety standards while maintaining energy efficiency.
Questions
How often should commercial electrical systems be tested?
Commercial installations require testing every 5 years or when occupancy changes. We provide EICR reports identifying any necessary remedial work to maintain compliance with UK safety regulations.
What is included in a building refurbishment?
Our services cover structural works, electrical upgrades, plumbing, partitioning, and interior finishes. We handle complete strip-outs, office makeovers, and warehouse refurbishments with minimal business disruption.
Do you offer data cabling for small businesses?
Yes, we work with businesses of all sizes. From small office networks to large industrial facilities, our structured cabling solutions ensure reliable connectivity with testing and certification included.
Can solar panels work in UK weather?
Our solar PV systems are designed for UK conditions. While efficiency peaks in direct sunlight, panels generate electricity even on cloudy days, with performance optimised through site-specific design and installation.
Are your electricians certified?
All our engineers are NICEIC-certified and fully qualified. We adhere to Part 'P' of the Building Regulations and Electricity at Work Regulations, ensuring all installations meet current safety standards.