Pergola Electrics in the UK: Power, Safety Rules and Costs
An electric pergola needs a fused, RCD-protected mains supply run to the structure by a registered electrician. For a freestanding pergola that usually means armoured cable buried from the house. For one fixed to the house it is often a short spur from an existing circuit. The motor, lights and heaters are all low-demand until you add heating, and the cable route is where most of the cost and planning sits. This guide covers what a motorised pergola draws, how it is wired, which UK rules apply and what the electrical side typically costs.
TL;DR
Motorised louvres, LED lighting and controls use modest power. Heaters are the big load and may need their own circuit.
Freestanding pergolas are normally fed by steel wire armoured (SWA) cable buried between the house and the structure.
Outdoor circuits need 30mA RCD protection and IP-rated accessories, and the work must meet Part P and BS 7671.
A professional outdoor socket installation typically costs £150 to £400, with trenching extra.
Plan the electrics before the pergola is ordered, so cable routes, isolators and control positions are fixed before the frame goes up.
Table of Contents
What actually needs power on an electric pergola
The word “electric” covers several separate loads, and each one affects the supply you need.
Motors. A motorised louvred roof or retractable canopy uses one or more motors, driven by a control box. Each motor draws little power and only runs while the roof moves. The control box needs a permanent live feed, so the pergola cannot simply be unplugged between uses.
Lighting. Integrated LED strips or downlights are the lightest load. Many run through a low-voltage driver, which still needs a mains feed. If you only want lighting and are trying to avoid new cables, our guide to pergola lighting ideas that avoid rewiring lists the options.
Heaters. Infrared or electric radiant heaters are the heaviest demand. Several heaters together can approach the limit of a standard circuit, so the heater rating, not the motor, usually decides the cable size and protective device.
Sensors and smart controls. Rain, wind and sun sensors, remote handsets and app control add small loads. They do add components, though, such as receivers and gateways, that must sit somewhere dry and within signal range.
Add up the rated watts of everything you plan to install and give that figure to your electrician. Ask your pergola supplier for the electrical data sheet of the exact model, because loads vary between systems. Never rely on a general figure.
Socket, fused spur or hard-wired supply
The three common ways to connect an electric pergola are different in how they are protected, how permanent they are and what they suit.
Connection | Best for | Points to know |
Weatherproof outdoor socket | Light loads, motors and LED drivers on a pergola beside the house | Needs 30mA RCD protection. Convenient, but someone can plug other equipment into it |
Fused connection unit (spur) | A fixed pergola feed from an existing circuit | Tidier and permanent. The fuse rating is matched to the load. The circuit must have spare capacity |
Dedicated circuit from the consumer unit | Heaters, larger roofs, outdoor kitchens or several loads together | Protected by its own RCBO. It is a new circuit, which has Part P consequences (see below) |
A plug-in arrangement is often tolerated by manufacturers for the motor alone, but a fixed connection is neater and leaves no loose flex outdoors. Your electrician will decide based on the load, the existing circuit and the distance. We would not hang a heater and a motorised roof from a garden socket that also runs a lawnmower.
If you are planning an outdoor kitchen under the pergola, the loads change a great deal. Read our installer safety checks for a pergola over an outdoor kitchen before you commit to a layout.
Getting power to a freestanding pergola
When the pergola stands away from the house, the supply has to cross the garden. The usual method is to bury steel wire armoured cable underground from the house to the structure. Its armour protects the conductors from spades and forks, and it can also serve as part of the earth path when terminated correctly.
Things that shape the job:
Route. A straight run across lawn is the cheapest. Crossing paving, decking or a patio means lifting and reinstating surfaces.
Depth and marking. Buried cable should be laid at a suitable depth with warning tape above it. Your electrician will follow BS 7671 for the installation conditions.
Termination. The cable ends in a weatherproof enclosure or isolator at the pergola, where the local wiring takes over.
Earthing. Metal pergola frames, particularly aluminium, should be bonded as your electrician specifies.
Heavy-duty structures such as a driveway pergola with an aluminium frame are a reminder of how much metalwork you may need to bond, so mention the frame material when you brief the electrician.
Before any digging, locate drains, water pipes and other services. Foundations matter here too: post positions decide where the cable should end, so settle both together. Our advice on pergola foundations explains the options.
UK safety rules that apply
Part P and who can do the work
Electrical work in a home or garden must comply with Part P of the Building Regulations. Apart from some minor tasks, it must be reported to building control or carried out by a registered electrician. Adding a new circuit to a dwelling must either be notified to Building Control or done by someone registered with a Competent Persons Scheme.
The practical route is the simple one. A registered installer from an approved national body can self-certify fixed electrical work, so you do not need to make a building regulations application yourself. Electrical Safety First advises leaving electrical work to competent professionals. These rules are written for England and Wales, so if you are elsewhere in the UK, check the local requirements with your electrician.
After the job, ask for the paperwork. A registered electrician can issue an Electrical Installation Certificate or Minor Works Certificate confirming the work meets BS 7671. Keep it with your house documents, because a buyer’s solicitor may ask for it.
RCD protection and IP ratings
BS 7671 sets the wiring standard. A current guide to it states that Regulation 411.3.3 requires 30mA RCD protection for socket outlets rated 32A and below. One acceptable way to deliver that for an outdoor circuit is an RCBO at the consumer unit, which combines overcurrent and earth-leakage protection for that circuit only. The benefit is that a fault on the pergola circuit trips only that circuit, not your whole house.
Accessories outdoors need an ingress protection (IP) rating suited to the exposure. The first digit covers dust and solids, the second water. Guidance for UK gardens puts IP44 as a minimum for sheltered spots and IP65 or higher for exposed positions that take direct rain. A pergola roof offers some cover, but louvres open, wind drives rain sideways and the underside gets condensation, so specify generously.
We cover the same principles for retractable awnings in our guide to electric awning wiring to BS 7671, including the RCD trips that catch many people out.
Lighting, heaters and smart controls
Lighting. Check whether the pergola’s lights are mains-voltage or run from a driver. A driver should sit in a dry, ventilated place and be reachable for replacement. Fittings that are part of the pergola come with an IP rating from the maker, which your electrician should check against the position.
Heaters. Confirm the wattage per heater and how many you will fit. Mount them at the height and clearance the manufacturer states, and keep them clear of fabric, curtains and side screens. Heaters usually suit a dedicated, switched supply so they can be isolated separately.
Controls. Wireless handsets, apps and weather sensors need a reliable signal. If your Wi-Fi does not reach the end of the garden, plan a repeater or an access point before the install, not afterwards. Wind and rain sensors are worth fitting on a motorised roof: they close it automatically if you are out.
Isolation. Ask for a lockable or clearly labelled isolator near the pergola so that maintenance, cleaning and any later repair can be done with the power off.
What the electrics cost
Costs depend mainly on distance and ground. Published guidance puts a professional outdoor socket installation at around £150 to £400 in the UK, varying with the cable route. Trenching costs £20 to £40 per metre depending on ground conditions, and reinstating paving adds more.
A worked example makes the spread clear. A pergola against the back wall with an outdoor socket a metre or two away sits at the low end. A pergola at the bottom of a 15 m garden needs trenching along that length, a consumer-unit connection and possibly a new circuit, so it will cost considerably more. Treat these as guide figures and ask your electrician for a written quote for your own layout.
To put electrics in context with the rest of the budget, see what UK homeowners really pay for a pergola.
Our perspective
We have fitted shading for homes and businesses for over 15 years, and the electrics are the part customers think about last and regret most when it is left late. The pattern is the same every time: the pergola is chosen, then someone asks where the power will come from. Our advice is to settle the cable route at the quote stage. Decide where the motor, lights and any heaters will sit, give your electrician the model’s electrical data and agree who does what on site. That avoids lifted patios and last-minute spurs. We select premium systems because they are designed to be wired neatly: concealed cable channels, sensible control positions and proper weather protection. We supply and install the pergola and work around your registered electrician so the whole project fits together. Andrew
Planning your pergola with the electrics in mind
If you are choosing between a pergola, a veranda and a retractable awning, the electrical demand differs. A retractable awning typically needs only a motor feed. A pergola with louvres, lights and heaters needs more planning. Our pergolas range is designed with these options in mind, and we can tell you what each configuration needs before you book an electrician.
The order of work that avoids rework:
Choose the pergola and list every electrical extra: motor, lights, heaters, sensors, screens.
Get the electrical data for that exact model.
Have a registered electrician survey the route and quote.
Agree foundations and cable positions together.
Install the structure, then the final connections and testing.
Collect the certificate and the pergola handover instructions.
Check planning rules at the start too. Height and position limits can affect where you can build, as set out in our pergola planning permission guide. With winter ahead, it also pays to confirm your frame will cope with snow loads, because a motorised roof that is stuck closed under weight is a poor place for a motor to work against.
Talk to us about your pergola
We design, supply and install pergolas, verandas and retractable awnings across Yorkshire, Derbyshire, Nottinghamshire and Lincolnshire, with manual or electric operation, LED lighting, heaters and weather sensors available as options. We offer a free, no-pressure quote and will talk through the electrical requirements for your chosen layout.
See our supply and installation service or ask about the terms of our limited warranty when you request a quote.
FAQ
Can an electric pergola run from a normal outdoor socket?
Often the motor and lights can, if the socket is weatherproof, RCD-protected and within reach. Heaters and larger loads usually need a fixed connection or their own circuit. Your electrician will advise after checking the rated load and the existing circuit.
Do I need a registered electrician for pergola wiring?
In practice, yes. Garden electrical work must comply with Part P, and new circuits must be notified or done by someone registered with a competent person scheme. A registered electrician can also certify the work, which saves you the application.
How is a freestanding pergola connected to the house supply?
Usually with armoured SWA cable buried from the house or consumer unit to the pergola, finished in a weatherproof enclosure or isolator. The route, depth and protection are set by BS 7671 and confirmed by your electrician.
How much does it cost to power a pergola?
A professional outdoor socket installation typically costs £150 to £400, and trenching adds £20 to £40 per metre. Long runs, new circuits and reinstated paving raise the total, so get a written quote for your garden.
Do pergola lights and heaters need special wiring?
They need IP-rated fittings and correct protection, and heaters often suit a dedicated switched supply. Check the manufacturer’s electrical data for the exact products and give it to your electrician before they price the job.
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