In a UK block of flats, three separate things decide whether plug-in solar is possible: what your building is made of, whether the balcony is demised to you, and what your lease says. The first is an outright prohibition in the product specification that no freeholder can waive.
This UK guide sets out the general position and what to check. It is not advice on your lease and cannot be — leases differ materially between developments, and two flats in one block can sit under different wording. If you are refused, or asked for a fee, take your own advice on the document you hold.
Check the building before you check the lease
Three Gates, and the Lease Is Only One of Them
Plug-in solar is not traditional rooftop solar. Rooftop solar panels need an installer, scaffolding and roof space you probably do not own — a homeowner with a roof can fit an array, and most people living in flats cannot. Plug-in systems arrive in a box. Clamp the balcony solar panels to a railing, plug them into an ordinary 13 A socket, and through daylight hours the solar energy goes into your own circuits. No electrician, no professional installation. It is about the simplest solar technology sold in the UK, and the output is capped well below a rooftop array.
The point is to buy less electricity from the grid. Reported government estimates put the saving at £70–£110a year, on a kit expected to cost £400–£600, with a modelling mean of £500.
Read the savings range carefully, because a balcony sits at the bottom of it. The £110figure is modelled on a 30-degree south-facing array. A near-vertical railing mount facing east or west is the £70 case, and that is the one that applies here. Enough to notice on your energy bills, not enough to change how you heat or light the flat. Solar power you use yourself is worth more than the electricity you export, so self-consumption is what matters. Useful at household scale. Not a transformation.
Gate one is the product. From 27 August 2026, SI 2026 No. 848 makes a compliant device lawful to sell, and lawful to use in Great Britain. The use permission does not extend to Northern Ireland. Before that date these products cannot lawfully be sold or used here.
Gate two is the building, and in many blocks it settles the matter. Gate three is the lease — where most guides to solar panels on flats begin and end. Planning is a fourth question again: you may need planning permission, certainly on a listed building, and for flats the position is genuinely unsettled. See planning permission for balcony solar in flats.
Where Installation Is Prohibited Outright: Clause 5.8
Version 2 of the Interim Product Specification, published 16 July 2026 by the Department for Energy Security and Net Zero and given effect by SI 2026 No. 848, states at clause 5.8 that installations shall not be permitted on:
- aluminium composite material (ACM) or metal composite material (MCM) cladding systems
- high pressure laminate (HPL) cladding systems
- timber cladding systems
- timber balconies
- buildings subject to external wall remediation works, building safety remediation works, or equivalent restrictions relating to external wall fire safety
Read that against the UK’s flat stock and the consequence is plain. Anything clad in ACM, MCM or HPL, anything with timber cladding or a timber balcony, and any block under external wall remediation or building safety remediation works is excluded — regardless of consent.
This is the point people miss, so it is worth being blunt. Clause 5.8 is a prohibition in the product specification, not a restriction held by your building owner. Nobody is being asked to decide it. A freeholder, landlord, managing agent or management company agreeing to the installation of solar panels changes nothing, because the prohibition was never theirs to waive.
No one can consent their way past clause 5.8
The same safety rules make users responsible for keeping escape and rescue paths clear, for not fixing panels to walls forming a property boundary between dwellings, and for not increasing the risk of fire spreading along external walls. Those points, and the insurance obligations attached to them, are covered on our leasehold balcony solar page.
How to Find Out What Your Building Is Made Of
Most flat owners do not know what their external walls are made of. The specification anticipates that: where there is uncertainty about how the building is constructed, it tells users to consult the building owner, freeholder, managing agent or other responsible person. That is the step the specification expects, not optional politeness.
Ask in writing, and ask specifically. Whether the wall build-up includes ACM, MCM, HPL or timber. Whether the balconies are timber. Whether the building is subject to, or awaiting, external wall remediation — the fastest disqualifier of the four. Your freeholder or management company may hold external wall fire review documentation; ask whether any exists. We are not going to tell you that you are entitled to a copy, because we have not established that you are. If your block is a higher-risk building, section 92 of the Building Safety Act 2022 requires the accountable person to give residents prescribed information on request.
Is the Balcony Actually Yours? Demised Premises and Common Parts
This distinction decides more of these cases than the alterations clause does. In some developments the balcony is demised to the flat and forms part of your leasehold property. In others it is a common part, with the leaseholder holding a right to use it.
There is a third pattern, and it is common: the balcony floor and internal space are demised, while the structure, the external wall face and the railing remain retained parts. That matters, because a plug-in solar system is mounted on precisely those elements. A railing clamp fixes to the balustrade; anything hung outside faces the external wall. A balcony can be yours in the sense that nobody else may use it, while the surface you want to fix to is not.
So do not stop at “the balcony is mine”. Check the document:
- The demise definition— what the demised premises includes and, more importantly, what it expressly excludes. Exclusions of structure, exterior and main walls are common drafting.
- The plan annexed to the lease— the demise is usually shown by colouring or hatching. Does the balcony sit inside the edging, and is the plan “for identification purposes only”?
- Any separate right to use— a right granted in a schedule is a different thing from a demise.
- The title plan at HM Land Registry, as a cross-check.
Where the wording is ambiguous, and many leases are, short advice from a leasehold solicitor is worth more than any general guide, this one included.
“My balcony” and “my railing” are not the same question
What an Alterations Covenant Does — and What Section 19 Doesn’t Fix
Leases handle alterations three ways. An absolute covenant prohibits the work outright. A qualified covenant prohibits it without consent. A fully qualified covenant prohibits it without consent, and adds that consent is not to be unreasonably withheld.
Section 19(2) of the Landlord and Tenant Act 1927 does something useful to the middle category. Where a lease contains a covenant against making improvements without licence or consent, that covenant is deemed — “notwithstanding any express provision to the contrary” — subject to a proviso that the consent is not to be unreasonably withheld.
It does nothing to an absolute covenant. If the lease bars the alteration outright, section 19(2) does not make it negotiable.
The section also preserves things for the landlord: a reasonable sum for damage to, or diminution in the value of, the premises or neighbouring premises, and for legal or other expenses properly incurred; and, where the improvement does not add to letting value, an undertaking to reinstate where reasonable. A reasonable request is not a free one.
One honest limitation. Whether installing a plug-in solar device is an “improvement” within section 19(2) turns on case law we have not read, and we are not going to reason our way to an answer on a page people may rely on. Nothing in recent leasehold reform legislation addresses plug-in solar specifically either.
If Your Block Is a Higher-Risk Building
Under section 65(1) of the Building Safety Act 2022, a higher-risk building is one in England at least 18 metres tall or with at least 7 storeys, containing at least 2 residential units. Height runs from ground level to the top floor surface of the top storey.
Section 62(1) defines a building safety risk as risk to people in or about the building from the spread of fire or structural failure. A panel fixed to an external wall engages both at once. Sections 83 to 85 require the accountable person to assess those risks, take all reasonable steps to prevent them materialising, and maintain a safety case report. That is why a tall block asks more questions than a two-storey conversion — a statutory duty, not obstruction. A duty runs the other way too: section 95(2) requires residents not to create a significant risk of a building safety risk materialising, or to interfere with a relevant safety item. Our building regulations guide covers the wider picture.
Who Actually Grants Consent in a Block
Not always the freeholder, and getting this wrong wastes weeks. In many blocks of flats a residents’ management company holds the relevant functions. Where leaseholders have exercised the right to manage, section 98 of the Commonhold and Leasehold Reform Act 2002 provides that approval functions of the landlord or other party to a long lease “are instead functions of the RTM company”. The managing agent is usually who you correspond with and usually not who decides. Ask early, in writing, who holds the approval function. Our guide for managing agents and RMCs sets out the same process from their side.
One Device Per Household — in a Block of Sixty Flats
The specification permits one device per final ring circuit. But GB network connection requirements also apply, and Engineering Recommendation G98 Issue 2 Amendment 1 2026 restricts this to one device per household unless and until it is amended. Two limits; the tighter one wins. From 27 August 2026 a household may connect one device, whatever its circuit count. Battery storage inside the device is not permitted either, so battery-integrated kits sit outside this route entirely.
In a block, each flat is its own household with its own supply — one device each, not one per building. Your distribution network operator needs to know what renewable generation is connected to its network, which is why notification is mandatory; what is still in development is the simplified registration route, not the obligation. The joint statement of 9 June 2026 by the ECA, Electrical Safety First, the IET, NICEIC and SELECT draws the consequence: “If many flats in one building each had plug-in solar panels, the combined effect on the local network could be significant.” A reason for your operator to know, not a reason not to install. Our list of kits verified on the ENA Type Test Register tracks what is approved — a CE or UKCA mark is not the test.
Frequently Asked Questions
Can I install solar panels on a leasehold flat?
Possibly, and the building decides before the lease does. Check first whether clause 5.8 excludes your block — ACM, MCM or HPL cladding, timber cladding, timber balconies, or external wall remediation. If it clears that, the questions are whether the balcony and railing are demised to you, and what your alterations covenant says.
Why are plug-in solar panels not legal in the UK?
Because they do not comply with the Plugs and Sockets etc. (Safety) Regulations 1994 or the Electricity Safety, Quality and Continuity Regulations 2002 as they stand. SI 2026 No. 848 changes that from 27 August 2026, with the permission to use extending to Great Britain.
Do I need permission from the freeholder to install solar panels on a flat?
In most leasehold properties, in practice yes — the mounting point is usually part of the building rather than part of your demise. Whether permission to install solar can be withheld depends on whether the covenant is absolute, qualified or fully qualified. Get any permission from a landlord or freeholder in writing.
Is my balcony demised to me or is it a common part?
Only your lease answers that. Read the definition of the demised premises and what it expressly excludes, check the colouring on the plan annexed to the lease, and cross-refer to the title plan at HM Land Registry.
Does it cost money to get freeholder consent?
It can. Section 19(2) of the Landlord and Tenant Act 1927 preserves a landlord’s ability to require a reasonable sum for damage or diminution in value, and for legal or other expenses properly incurred. We will not quote a typical figure, because we have no reliable UK data on what these applications cost.
Is “leasehold” the same as leasing solar panels?
No, and the two get confused because they share a word. Leasehold is a form of tenure in England and Wales. Leasing solar panels is a financing arrangement, largely a US model, in which a provider owns the equipment. Plug-in solar here is a kit you buy outright.
If your building clears clause 5.8 and you are ready to approach the freeholder, our leasehold balcony solar guide sets out the request step by step. Renters and flat owners take different routes: for landlords, solar panels installed by a tenant raise a separate question again — see the Renters’ Rights Act 2025 and balcony solar.