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Welcome to CSI Ltd electrical, plumbing and gas services and installation to the domestic, commercial and industrial markets across the London. With a team of many fully qualified electricians, plumbers and gas engineers CSI Ltd offer a comprehensive range of electrical, plumbing, gas services and installation to the domestic, commercial and industrial sectors across the London and Hertfordshire. We are a member of The Gas Safe Register, Electrical Contractors Association (ECA), NICEIC Registered Domestic Installer, NICEIC Approved Contractor and PAT Approved. and JIB Electrical Contractor Industry.  

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Welcome to CSI Ltd electrical, plumbing and gas safety inspection and testing to the plumbing, electrical and gas installations and equipment safety certificates markets across the London. Control System Installation Ltd is a company in the field of combined gas and electrical safety inspections, gas and electrical equipment services, safety and performance checks, products and advice, in accordance with UK gas safety and NICEIC approved contractor regulations.  

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Welcome to Control System Installation Ltd, building and Maintenance Company you can rely on for all of refurbishment, extension, renovation, fitter, installations, and renewable energy requirements in Greater London and Hertfordshire for home owners, letting agents, landlords and businesses.   We specialise in fast response, repairs, quality installations and annual maintenance programs.

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For rented properties it is the Landlord's responsibility to ensure it is gas safe and they must be able to provide their tenants with an up-to-date Gas Safety Certificate to show that boilers and..  Read More



gas1Gas ServicesGas Safe Register maintain the register of businesses and operatives who are competent to undertake both piped natural gas and liquefied petroleum gas (LPG) in Great Britain, Northern Ireland..  Read More




electricityElectrical Services: After a number of years wires in a home or commercial building can become damaged through DIY or just general deterioration. In this instance a rewire of the house of affected areas..  Read More




plumbingPlumbing Services: The Water Supply (Water Fittings) Regulations 1999 (the Regulations) are national government requirements for the design, installation and maintenance of plumbing systems, water fittings..  Read More

Latest Extras

Time to have something new

Time to have something new
Time to have something new Keep your home warm and energy efficient by choosing...

Landlord responsibility

Landlord responsibility
Landlord responsibilities for health and safety As a landlord, you must keep your...

last safety comment

last safety comment
You are more than twice as likely to die in a fire at home if you haven't got a working...

Why London CSI ?

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At the heart of what we do is our national online database, the UK's largest register for pre-qualified contractors and consultants. Read More


Pat testing or portable appliance testing is an important part of any health & safety policy. This site is intended as a guide to both the legal implications and to the technical requirements. Read More

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We’re the official list of gas engineers who are registered to work safely and legally on boilers, cookers, fires and all other gas appliances.  Read More

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The FMB is the UK's largest trade association in the building sector, with national offices in England, Northern Ireland, Scotland and Wales, supported by additional regional offices.  Read More


NICEIC is the UK electrical contracting industry’s independent voluntary body. We offer leading certification services, Building Regulations Schemes, products and support  Read More

As of 1 January 2005 it is a legal requirement for all work on fixed electrical installations in dwellings and associated buildings to comply with relevant standards.  Read More

Live Support

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Annual Safety Certificate

I used CSI Ltd to carry out an extensive PAT testing at my dental practice...

Dr Reza Farid Dental Practice

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Honestly Prices

I received a price from CSI for a new boiler installation but I decided to go with another company that gave me very cheaper ...

Shirin N9

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Gas & Electrical Safety Certificate

Very helpful staff over the phone and also on the day of the engineer's visit the guy was really friendly...

David EN4

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Efficient and Organized

CSI Ltd were extremely professional from the initial quote to the end of the job.

Birdwatch Magazine

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