Plug-in photovoltaic solar panel systems became legal to buy and use in the UK on 27 August 2026, creating a new compliance exposure for landlords who must now decide whether tenant-installed electrical generation equipment requires prior permission, electrical safety checks and insurer notification. Risk assessment firm Riskstop has warned that the systems introduce electrical, fire and structural hazards comparable to conventional roof-mounted panels, compounded by user installation and interaction with existing circuits that may not have been assessed for reverse power flow.
The regulatory change allows householders to connect solar panels directly to standard electrical sockets without professional hard-wiring, shifting what was previously a landlord capital improvement into potential tenant modification. Letting agents and portfolio landlords now face ambiguity over whether plug-in systems constitute alterations requiring consent under tenancy agreements, trigger Electrical Installation Condition Report (EICR) requirements, or fall outside existing safety regimes as removable tenant possessions.
What the systems do
Plug-in PV systems feed electricity through an existing socket circuit rather than connecting directly to a property's distribution board. The panels are mounted on balconies, external walls or terrace areas and connected via a standard three-pin plug, making them accessible to flats and properties unsuitable for conventional roof installations.
Johnny Thomson, head of strategic planning at Riskstop, said: "Whilst plug-in PV systems are generally smaller than conventional solar installations, they should not be considered risk-free. They introduce many of the same electrical, fire and structural hazards associated with traditional PV systems, together with additional risks arising from user installation, product compliance, mounting arrangements and interaction with existing electrical circuits."
The firm's assessment identifies product compliance, circuit suitability and external mounting as the primary risk areas. Panels fixed to balconies or walls must be secured against wind loading. Electrical circuits designed only to draw power may not be protected against reverse feed from generation equipment. Product standards and certification requirements remain unspecified in available guidance.
The compliance gaps
No detail has been published on which regulatory changes legalised plug-in solar or what product standards, certification thresholds or network operator notification requirements now apply. Riskstop states that landlords "may" need to notify the relevant distribution network operator, but does not specify the capacity or configuration that triggers notification.
It is unclear whether existing EICR regimes in England, Scotland and Wales treat plug-in systems as tenant possessions or fixed electrical installations requiring periodic inspection. The distinction matters: if the system is a landlord-permissioned installation, the electrical safety certificate may need to assess its integration with the property's circuits. If it is tenant equipment, responsibility for safe use and removal may sit with the occupant, but liability for resulting damage to the property's electrical system remains disputed.
Landlords in leasehold properties face a second layer: freeholder consent may be required for external mounting, particularly where panels alter the building's appearance or penetrate the structure. Managing agents administering leasehold blocks will need to establish whether communal insurance policies cover tenant-installed generation equipment and whether individual leaseholder policies require endorsement.
Insurance and liability
Riskstop says insurers and brokers will increasingly require details of what has been installed, where it has been positioned and how it is being managed. No evidence has been provided on premium implications, claims experience or whether insurers are treating plug-in solar as a material change in risk requiring mid-term notification.
The liability question is untested. If a tenant-installed system causes electrical failure, fire or damage to adjoining properties, responsibility may turn on whether the landlord gave informed consent, conducted appropriate electrical checks, or failed to update tenancy terms to address installation standards and removal obligations.
Landlords who prohibit plug-in solar outright may face tenant challenges on grounds that the equipment is portable and does not constitute an alteration. Those who permit installation without assessment or documentation may find their insurer disputes cover on the basis that electrical generation equipment was not disclosed.