Balcony Solar Panels: A Guide for Renters and Flat Owners

Roughly a third of households in this country rent, and several million more own a flat with no rights over the roof above it. For all of them, every article about solar panels has until now been of academic interest at best. The legalisation of plug-in solar on 27 August 2026 is the first development in years that genuinely applies to that group, and balcony mounted kits are the form it usually takes.

This guide is about the practicalities: what you are allowed to do, whose permission you actually need, and whether the numbers justify the effort. For the rules themselves, our guide to the new plug-in solar regulations sets out the detail.

What a Balcony Kit Actually Is

A typical kit is one or two rigid panels, a small micro inverter, mounting brackets and a lead ending in an ordinary three pin plug. The panels hang on the outside of a balcony railing, sit on a frame on the balcony floor, or fix to an external wall. The inverter converts the output to mains voltage and the plug goes into a socket. Total output is capped at 800W, and the whole thing can be taken down and taken with you when you move, which is the feature that matters most to renters.

Compliant kits currently run from about £450 for a single panel bundle to around £600 to £650 for a two panel, 800W system. Estimated savings are in the region of £43 to £84 a year on a full sized kit, giving an indicative payback of roughly seven to fourteen years. On a strict financial reading that is a long wait. On the other hand, the kit is portable, so unlike a rooftop installation the money does not stay behind when you leave the property.

Which Way Does Your Balcony Face?

Orientation matters more for a balcony kit than for a roof array, because you have far fewer panels and no ability to spread them across two aspects. A south facing balcony in clear sun will produce towards the top of the estimated range. An east or west facing one will produce noticeably less, perhaps 80 to 85 per cent of the south figure, though it will do so at times of day when you are more likely to be at home to use it. A north facing balcony is generally not worth the outlay.

Shading is the other consideration, and in a block of flats it is often severe. Balconies above and beside you, the building opposite and nearby trees can put a panel in shadow for much of the day. It is worth watching your balcony across a full day before committing, because a shaded balcony will undercut even the modest estimates above. Our tool will give you the orientation of your building as a starting point, though on a balcony your own observation of the shading matters just as much.

Permission: The Part That Stops Most People

Planning permission is usually not required. Microgeneration up to 800W on a balcony or external wall normally falls within permitted development, with the familiar exceptions for listed buildings, which need consent regardless, and conservation areas, where anything visible from the highway is restricted.

The permission that does apply is private. If you rent, you need your landlord to agree. If you own a leasehold flat, the balcony and the external walls are almost always retained by the freeholder, so you need the freeholder or the management company to agree, and your lease may contain a clause about alterations to the exterior. Ask in writing and keep the reply. Doing the work first and asking afterwards puts you at risk of being told to remove it.

Fixing It Safely

A panel on a railing is a sail. Wind loading is the main practical risk with balcony solar, and a panel that comes loose several floors up is a serious matter. Use the mounting hardware supplied for the kit rather than improvising, follow the manufacturer instructions on bracket spacing, and check the fixings periodically. If your balcony is exposed or you are high up, a lower angle reduces wind load, at some cost to output.

On the electrical side, the kit must plug directly into a socket outlet, not into an extension lead or an adaptor. If the only socket within reach of the balcony is an outdoor one, confirm it is a proper weatherproof outdoor socket on a sound circuit. It is also worth telling your contents insurer, as you would with any other significant item.

The Notification You Still Have to Send

Renting does not exempt you from the G98 notification to your Distribution Network Operator, which is required within 28 days of the kit being commissioned. It is free, it is done online, and it takes about twenty minutes. It is a notification rather than an application, so you do not wait for permission before connecting.

Is It Worth Doing?

If you own a house with a usable roof, no. You would be choosing a small portable system over a much larger permanent one that also qualifies for export payments, and the comparison is not close. Our article on plug-in solar versus rooftop solar sets the two side by side.

If you rent or own a flat, the comparison is not with a rooftop array, because that was never available to you. It is with doing nothing. Seen that way, a kit that takes an estimated seven to fourteen years to pay for itself, but which you can unbolt and carry to your next address, looks more reasonable. Be clear eyed that this is a modest saving on a modest outlay rather than a transformation of your energy bills, and check your balcony orientation and shading honestly before you buy.