When power failure is not an option, London businesses need a generator partner they can rely on. Generators London provides commercial diesel generator hire, installation, servicing and 24/7 emergency repair across every London borough, backed by CompEx-certified engineers who have been working on commercial power systems since 2009.
Our team covers everything from short-term hire for construction sites and events to permanent standby installations for data centres, hospitals and industrial facilities. In this guide you will find details on our hire fleet, installation capabilities, planned maintenance contracts, emergency breakdown response and load bank testing services.
What We Do
We are a specialist commercial generator company covering the full lifecycle of diesel generating sets. Whether you need a machine on site tomorrow or a fully engineered standby power solution, our engineers carry the qualifications and experience to deliver.
Generator Hire
Our diesel generator hire fleet ranges from 20 kVA portable units to 1,000 kVA large-scale sets. We offer same-day delivery across London for urgent requirements and flexible rental periods from a single day to multi-year contracts. Fuel management and top-up deliveries are available as an add-on to all hire agreements.
Generator Installation
Our engineers design and install standby and prime power generator systems for commercial, industrial and critical infrastructure sites. Every installation includes a full load assessment, cable containment, ATS panel installation and commissioning to BS 7671 standards. We issue completion certificates and full as-built documentation on handover.
Generator Servicing
Planned maintenance is the single most effective way to keep a generator ready when you need it. Our generator servicing contracts cover all makes and models, with scheduled visits aligned to manufacturer intervals. Every service produces a detailed report and updated service record for compliance purposes.
Emergency Generator Repair
Our 24/7 emergency breakdown line is answered around the clock by a qualified engineer. We aim to have a technician on site within four hours across Greater London. Our vans carry a complete stock of common consumables and spare parts, so most faults are resolved on the first visit.
Load Bank Testing
Load bank testing confirms that a generator can carry its rated capacity under realistic operating conditions. We use resistive and reactive load banks to test sets to 100% rated output, identify wet stacking, and confirm that the automatic transfer switch operates correctly. A test certificate is issued on completion.
Why Choose Generators London?
We have been engineering commercial power solutions across London since 2009. Our engineers hold CompEx certification, which confirms competency in electrical and mechanical work in potentially explosive atmospheres, a standard demanded by many industrial and petrochemical clients.
Every job is completed by in-house engineers, not sub-contractors. We carry full public liability and employers' liability insurance, and all work is documented to support your compliance obligations. Our fleet covers all kVA ratings and all major generator brands including Cummins, Perkins, Caterpillar, FG Wilson, Kohler and Aggreko.
Call 0800 000 0000 to speak to an engineer now, or request a free generator survey online.
Areas We Cover
We cover all 33 London boroughs including the City of London, Westminster, Canary Wharf, Croydon, Ealing, Barnet and Bromley. Our engineers are also available for sites along the M25 corridor and within the surrounding Home Counties.
See our full areas covered page for a complete list of locations we serve.
Frequently Asked Questions
What size generator do I need for my site?+
Generator sizing depends on the total connected load in kVA or kW, the starting current of any motors on site, and whether you need the set to carry full load or partial load. Our engineers carry out a free load assessment as part of every site survey, so you get an accurate specification rather than a guess. Contact us on 0800 000 0000 to book yours.
How quickly can you deliver a hire generator to a London site?+
Same-day delivery is available across Greater London for stock units. For non-urgent bookings, we confirm delivery at least 24 hours in advance and include a site induction with every hire. Fuel is delivered separately or can be pre-filled before dispatch, depending on your preference.
Do your engineers work on all generator brands?+
Yes. Our engineers work on all makes and models of commercial and industrial generating sets including Cummins, Perkins, Caterpillar, FG Wilson, Kohler, Sdmo, Himoinsa and Aggreko. We carry a broad range of OEM and quality-equivalent parts for common brands to minimise downtime on breakdowns.
What is CompEx certification and why does it matter?+
CompEx certification is the UK and international standard for competency in electrical and mechanical work in potentially explosive atmospheres. It is required on many industrial, petrochemical and pharmaceutical sites. All of our lead engineers are CompEx certified, which means we are approved to work in environments where standard electrical contractors are not permitted.
Can you cover a planned maintenance contract for an existing generator?+
Yes. We take on planned preventive maintenance contracts for existing generators regardless of age, brand or whether the set was installed by another company. We carry out an initial condition survey, agree a service schedule aligned to manufacturer recommendations, and issue full service records after every visit.
Need a Professional in London?
Don't let small problems become expensive disasters. Contact us today for a fast, free quote — or call our 24/7 breakdown cover emergency line.