Balcony Solar in the UK: What It Is, What Is Allowed and What It Saves

Published 9 September 2026

A balcony solar kit is one or two panels hung on a balcony rail or fixed to the wall beside it, wired to a small microinverter, and plugged into an ordinary socket. Since 27 August 2026 that is a legal thing to do in Great Britain without an electrician, provided the kit meets a short list of conditions, and it is the first way a flat-dweller has ever been able to own solar panels. This guide covers what the kit is, what the rules allow on a balcony specifically, why a balcony is a harder place to make electricity than a roof, and what one actually saves.

What a balcony kit is

The kits on sale are sold as a complete product: the panels, a microinverter rated at 800 VA or less, the cable and the plug, certified together as a unit. The panels usually add up to more than the inverter, 880 W or 1,000 W behind an 800 VA microinverter is normal, because in British light the inverter rarely sees its full rating and the extra panel earns its keep on dull mornings. Prices ran from about £399 to £700 for the kit when the socket route opened, with Argos listing five compliant models from £599, EcoFlow's STREAM balcony system from £399 and Anker SOLIX alongside them; the plug-in solar kits guide has the sellers and the checklist to run before buying.

What a balcony kit is not: a battery system. The socket route covers a solar-only product, so a kit with a battery in the box is outside it and back to needing an electrician. It is also not something you assemble from parts. Panels, an inverter and a plug bought separately do not inherit the certification, however good each part is.

The 800 VA route, as it applies to a balcony

The legal position is set out in full in the plug-in solar rules guide. The parts that matter on a balcony:

• 800 VA on the inverter, not the panels. The ceiling is the inverter's AC output. A kit with 880 W or 1,000 W of panel and an 800 VA inverter is inside the rules.
• Straight into a fixed 13A socket. Extension leads, cable reels and multi-way adaptors are banned in between, and this is the rule a balcony breaks most easily, because most balconies have no socket. If the kit's fixed cable will not reach one, an electrician has to add an outdoor socket. That is a small job, and the kit itself stays inside the plug-in route.
• G98 evidence. The route relies on verified G98 evidence recorded on ENA Connect Direct. Ask the seller for the forms and the datasheet, submit the notification, keep the confirmation. It is a record, not a permission, and there is nothing to wait for.
• A complete solar-only product. No battery, no self-assembly, as above.

Rail brackets, wall brackets and whose permission you need

A balcony panel is mounted one of three ways: hung on the outside of the railing with rail brackets, fixed to the wall beside the balcony, or stood on the balcony floor in a frame that fixes to nothing. Rail and wall brackets are usually sold separately from the kit, along with tilt frames and ballast feet, and this is where a kit's real cost creeps up.

The mounting decides the permission question. Fixing brackets to an external wall or to the balcony structure needs written consent from the landlord or freeholder. A leaseholder will usually be asking the freeholder or the management company, and a lease that forbids alterations to the exterior forbids this too. A free-standing frame on the balcony floor sidesteps the consent question entirely, which is a strong argument for it on a rented or leasehold flat, though it does not sidestep the fire-related exclusions below.

Balconies where it cannot go

Three exclusions, all about fire, all absolute:

• Timber balconies. No plug-in installation, however it is mounted.
• Buildings with combustible cladding. No plug-in installation.
• Buildings currently undergoing external wall fire remediation. No plug-in installation while the work is live.

Most people in a block of flats do not know off-hand whether their cladding counts as combustible. The managing agent will, and asking before ordering is cheaper than finding out afterwards.

Why a balcony makes less than a roof

A panel on a balcony rail hangs vertically, pointing at the horizon rather than at the sun. A panel on a roof or a garden frame sits at a tilt of around 35 degrees and faces the sky. The plug-in solar savings calculator puts a vertical south-facing panel at about 72% of what the same panel would make tilted and facing south, a figure measured from PVGIS across all six UK regions rather than estimated. Turn the rail to face south-east or south-west and it drops to 60%; east or west, to half. A north-facing balcony is worse still, and there is no bracket that fixes it.

Shading matters more on a balcony than on a roof because a balcony has neighbours. A building that shades the panel across the middle of the day costs about a quarter of the annual yield; a chimney or a thin tree for an hour or two costs a tenth; shade for most of the day costs nearly half. The one point in the vertical panel's favour is winter: the sun is low, the panel is facing it, and household consumption is at its highest, so the share of output you actually use tends to be better than the raw annual figure suggests.

Which leads to the single most useful piece of advice on this page. If there is any way to tilt the panel, tilt it. A tilt frame on the balcony floor, or on a flat roof or in a garden if you have one, is worth roughly 40% more output than the same panel hung vertically, which is more than the difference between any two kits on sale.

Worked example: a south-facing balcony in the Midlands

Take the savings calculator's own defaults: an 880 W kit on an 800 VA inverter, hung vertically on a south-facing rail in the Midlands, unshaded, at 25.7p per kWh, costing £499, with someone home for a good part of the day so the house uses 60% of what the panels make. The regional yield is the PVGIS figure for the Midlands; the UK solar map gives it for anywhere in the country.

• Annual generation = 0.88 kW × 1,010 kWh/kWp × 0.72 vertical south × 0.99 clipping = 634 kWh
• Used in the home at 60% = 380 kWh; spilled to the grid unpaid = 253 kWh, worth £65.13 if anyone paid for it
• Annual saving = 380 × 25.7p = £97.69
• Payback, year by year with tariff inflation = 4.9 years; net gain over 20 years £1,992.73
• Cost of the electricity produced = 4.1p per kWh against a 25.7p tariff

Now the balcony-specific variations on that, everything else unchanged:

The last two rows are the whole story. The tilt frame and the timer on the dishwasher move the answer more than the choice of kit does, and the empty flat halves the return without changing a single piece of hardware. The government's own figure at commencement was a saving of up to £110 a year; the table shows where "up to" comes from. Put your own balcony through the plug-in solar savings calculator before choosing a size, and if the numbers look thin, spend the difference on a tilt frame rather than a bigger kit. Occupancy versus the 800 VA cap is walked through in how to size a plug-in solar kit.

Getting more out of a balcony

• Run things in the middle of the day. There is no export payment on a plug-in kit, so every unit you make while the flat is empty is given away. Washing machine, dishwasher and immersion on a timer convert spilled units into saved money for nothing.
• Tilt it if the balcony allows. A frame on the floor rather than brackets on the rail, if there is room.
• Face the rail south if you have a choice of balconies. The difference between south and east or west is a third of the output.
• Check the shade at midday, not in the evening. A neighbouring block that shades the rail from eleven to two costs a quarter of the year's output.
• Get the socket sorted first. No extension lead, ever. If there is no socket within reach, that is the one electrician's visit the whole project needs.

Frequently Asked Questions