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Mounting

Where you're allowed to physically fix a plug-in solar panel depends on the surface, your tenancy status, your building, and - more than many guides mention - which of the UK's four nations you're in. This page covers the physical fixing rules and the planning-permission picture, including where England, Scotland, Wales and Northern Ireland genuinely differ.

A plug-in solar kit MUST connect directly into a wall socket. Do not use extension leads, multi-way adaptors, travel adaptors or RCD adaptors - the Interim Product Specification requires a direct plug-to-socket connection. See Extension leads for why.

Where you can mount one

Balcony railThe most common fixing - a bracket clamped to the rail, panel vertical
Exterior wallBracket-mounted, vertical or slightly angled
Flat roofAngled, ballasted frame - height-limited (see below)
Pitched roofFlush or near-flush, minimal wall/roof projection
Ground / gardenFreestanding angled frame, no building fixing needed
Fence postPost-mounted bracket, similar rules to a wall fixing

Whichever surface you use: a proper rated bracket is required - mounting to bare timber isn't permitted, and cable ties or tape alone are never an acceptable sole fixing. Route cabling so it doesn't sit somewhere it can trap water, and consider wind loading for the specific location's exposure, not just the panel's weight (see Considerations).

Permitted development limits (England)

England's permitted development rules - the ones that let you fit small-scale equipment without a full planning application - set specific projection and height limits for this category:

  • Wall projection, generalUp to 40cm from the wall face
  • Wall projection, near a highwayReduced to 20cm
  • Pitched roof projectionUp to 20cm
  • Flat roof height limit60cm above the roof surface

These limits were written with conventional roof-mounted solar PV in mind, then extended to cover the new plug-in category - always check the current detail on the government's own pages (linked below) rather than relying solely on this summary, and note that permitted development rights can be reduced or removed entirely in certain areas (see below).

How England, Scotland, Wales and Northern Ireland differ

The DESNZ plug-in solar reform that allows simplified self-install and registration is a Great Britain-only change - it amends GB electricity safety regulations and connects through GB distribution network operators via myplugin.solar. It does not currently extend to Northern Ireland, which has its own electricity market, its own network operator, and its own (unamended) rules. Planning permission for where you can physically mount a panel is separately devolved across all four nations. Neither of these facts is obvious from the DESNZ announcement alone, so they're set out plainly here:

🏴󠁧󠁢󠁥󠁮󠁧󠁿 England

Covered by the DESNZ plug-in solar reform. Permitted development rights apply as above, administered under the Town and Country Planning regime - check Planning Portal for your specific property.

🏴󠁧󠁢󠁳󠁣󠁴󠁿 Scotland

Covered by the DESNZ plug-in solar reform (part of Great Britain). Planning permission is handled under Scotland's own planning system, separate from England's permitted development limits - check with your local authority or Scotland's planning guidance before assuming the England figures above apply.

🏴󠁧󠁢󠁷󠁬󠁳󠁿 Wales

Covered by the DESNZ plug-in solar reform (part of Great Britain). Wales runs its own planning regime with its own permitted development rules for solar equipment - see the Welsh Government's own solar planning guidance rather than assuming England's limits apply.

Northern Ireland

Not currently covered by the DESNZ plug-in solar reform - NI's electrical connection rules (its own G98-equivalent via NIE Networks) have not yet been amended to match, and myplugin.solar's registration routes to GB network operators only. NI also has its own separate planning system under the Department for Infrastructure. If you're in Northern Ireland, treat this whole section as "watch this space" rather than "the same rules apply" - see Registration for more on the registration gap.

None of the four nations' planning rules were written specifically with small plug-in/balcony kits in mind - they were designed around conventional rooftop PV and have been extended or interpreted to cover this new, smaller category. Always check current local guidance rather than treating any of the above as the final word for your specific property.

When you'll still need planning permission, or someone's consent

  • Listed buildingsAlways need consent, in all four nations, regardless of the equipment's size
  • Conservation areasTighter limits than the standard permitted development figures, sometimes removing them altogether
  • Leasehold flatsNeed your landlord's or freeholder's permission, and often other leaseholders' agreement for anything fixed to a shared/communal structure like a balcony rail - this applies regardless of what planning law itself says
  • Certain cladding / buildings under remediationExcluded outright under the DESNZ specification itself, not just a planning question
  • Shared or communal balconiesIf the balcony structure isn't exclusively yours, get explicit agreement before fixing anything to it

Sources

This page is informational, not planning or legal advice. Planning rules change and vary by local authority - always confirm with your local planning authority or a planning professional before fitting anything to a listed building, in a conservation area, or on a shared structure.