The prices in this cost guide are accurate as of 2026*
Power cuts are frustrating and can disrupt your daily routine. A home backup generator provides immediate peace of mind when the grid fails. It keeps your lights on, your fridge cold, and your home office running smoothly.
In 2026, the cost of home generator installation depends heavily on your chosen generator size. It also relies on the complexity of your electrical setup. This guide breaks down the equipment and installation prices so you can budget accurately.
What does the average home generator cost in the UK?
The price of the generator unit varies based on its overall power output. It also depends on whether you choose a portable or a permanent standby model.
- Small portable generator (1kW – 15kW): £300 – £2,500
- Medium standby generator (7kW – 10kW): £2,000 – £4,000
- Large standby generator (11kW – 20kW): £4,000 – £8,000
A standard four-bedroom home typically requires an 8kW to 10kW generator to run essential appliances safely. The average home generator cost uk for this size sits around £3,000 for the unit alone.
What is the difference between portable and standby generators?
Your budget and power needs will dictate which type of generator is best for your home. This choice directly influences your final project price.
- Portable generators: These are smaller units that often run on petrol. You must manually start them and plug your appliances in directly, or use a manual transfer switch.
- Standby generators: These are permanently installed outside your property. They wire directly into your electrical system and turn on automatically during an outage.
- Fuel types: Standby models typically run on diesel, propane, or natural gas, which are highly efficient.
How much does home generator installation cost?
Installing a permanent standby generator requires professional electrical work. It is not a job for a DIY enthusiast. The generator must be safely integrated into your home’s main consumer unit to prevent dangerous electrical faults.
The home generator installation cost for labour and materials typically ranges from £1,000 to £3,000.
- Electrician hourly rate: £40 – £60 per hour
- Manual plug-in system setup: £600 – £1,000
- Automatic switchover installation: £1,850 – £3,000
- Estimated installation time: 8 to 16 hours
What makes up the total cost of a home generator system?
Beyond the unit and the electrician’s time, there are other components needed to create a safe setup. The total cost of the home generator system will include several essential extras.
- Automatic Transfer Switch (ATS): £250 – £1,000
- Concrete base preparation: £150 – £500
- Mounting and weather enclosures: £200 – £800
- Local authority building permits: £50 – £200
An Automatic Transfer Switch (ATS) is a vital safety component. It detects when the mains power drops and automatically starts your generator. This prevents electricity from back-feeding into the national grid. Back-feeding is illegal and highly dangerous for utility workers.
Why use Rated People to find a trusted electrician?
Connecting a generator to your home requires strict adherence to UK building regulations. Incorrect wiring poses severe fire risks and can permanently damage your expensive appliances. You need an experienced professional to ensure the system is safe and compliant.
Rated People connects you with qualified, local electricians who specialise in complex installations.
- Registered professionals: Find Part P registered electricians who can legally certify their work.
- Expert advice: Get guidance on sizing your generator correctly so it handles your specific power load.
- Verified reviews: Read feedback from previous customers to assess reliability and workmanship.
- Clear quotes: Compare upfront prices for the installation of transfer switches, cabling, and site preparation.
Using a vetted tradesperson guarantees your backup power system operates safely and seamlessly when you need it most.
With Rated People, you have the power to get it done. Find a trusted, local tradesperson today.
