Balcony Solar Rules by Country: UK, Germany, France, Spain (2026)

Published: 2026-07-11 · Updated: 2026-08-04

As of 2026, plug-in balcony solar is legal across all four major Western European markets. Germany allows 800 W with a simple online registration; the UK’s rules permitting a kit to be plugged into an ordinary socket take effect on 27 August 2026; France requires a brief declaration to the grid operator; Spain needs only a basic notification. Below is the full country-by-country breakdown, which we review and update monthly.

Quick comparison

United Kingdom

The UK is the newest market. BS 7671 Amendment 4 (in force since 15 April 2026) recognised plug-in solar in the wiring standard, and SI 2026/848 makes it legal to plug a compliant kit into an ordinary socket from 27 August 2026, once DESNZ’s Interim Product Specification (finalised 16 July 2026) applies. The framework closely follows Germany’s model: up to 800 VA inverter output, up to 2,000 W of panel capacity, connected through a standard BS 1363 plug with a 5 A fuse. There is no DNO pre-approval, but you must notify your DNO under G98 within 28 days of installing, and the micro-inverter must be on the ENA G98 Type Test Register. Because the legal market is only just opening, kit availability is still catching up — most early kits are German brands with UK plugs.

Germany

The most mature market, with over a million systems installed. Since the Solarpaket I reforms and the December 2025 clarifications: 800 W AC output cap, up to 2,000 Wp of panels, standard Schuko plug explicitly permitted, and registration only in the Marktstammdatenregister (MaStR) within one month — the grid operator cannot object. Tenants have a legal right to install balcony solar; landlords can refuse only for substantiated safety reasons. Old meters may temporarily run backwards until exchanged, which is tolerated.

France

Plug-in kits are legal and growing fast. Systems under 3 kW use a simplified process: a short online declaration to Enedis (a CACSI — convention d’autoconsommation sans injection — if you commit to not exporting). No tax, no complex paperwork. Note that façade or railing mounting in some municipalities can require a déclaration préalable at the town hall — worth a two-minute check for street-facing balconies.

Spain

Royal Decree 244/2019 made small self-consumption systems remarkably easy: installations up to 100 kWp only require notification after installation — no prior approval. Small balcony systems fall in the simplest category. Spain’s high solar yields (up to 40% more output than Germany for the same panel) make it arguably the best-value market in Europe, and adoption is accelerating.

What this means in practice

If you live in any of these four countries, the era of asking permission is essentially over — the remaining differences are small administrative steps. Check your expected payback with our calculator, then see which kits we currently rate.

Primary sources: BS 7671:2018+A4:2026 and SI 2026/848 with DESNZ’s Interim Product Specification (UK), EEG/Solarpaket I and §554 BGB (Germany), Enedis CACSI procedure (France), Real Decreto 244/2019 (Spain). This page is reviewed monthly; the “updated” date above reflects the last review.