Neighbour’s Tree Blocking Your Solar Panels? 

☀️ What ‘Right to Light’ really means in the UK (and what it doesn’t)

Let’s bust the big myth first, because half the internet gets this wrong. The Rights of Light Act 1959 and the older prescription rules protect light coming through defined apertures in a building — essentially windows. They do not protect sunlight falling on a garden, a patio, or a solar array. As solicitors and the RHS both point out, there is no general right to light in a garden under current UK law.

So when your neighbour says “I’m allowed to grow my trees as high as I like,” they’re mostly right — with some important exceptions I’ll come to. The law basically treats sunlight over someone else’s land as a bonus, not a right you own.

What you do have:

• A right to trim branches that overhang your boundary, back to the boundary line, as long as the tree isn’t protected (more on that below).
• The high-hedges complaint route if it’s a line of two or more trees over 2m.
• Planning law, which since a 2019 High Court case treats shading of your panels as a material consideration for new development.
• Private nuisance, if leaves or roots are causing actual physical damage — blocked gutters, cracked drains — not just lost generation.

🌳 Tree or hedge? The distinction that changes everything

Here’s the fork in the road. UK law treats a single tree and a high hedge completely differently, and most shading disputes turn on which one you’ve got.

The high-hedge route (the one with teeth)

Under Part 8 of the Anti-social Behaviour Act 2003, a “high hedge” is a line of two or more trees or shrubs, over 2 metres tall, that’s badly affecting the reasonable enjoyment of your home. If your shade comes from the classic pair of neighbourly leylandii or a row of conifers, you can complain to your council — but only after genuinely trying to settle it informally first, which the GOV.UK guidance on resolving neighbour disputes over high hedges and trees is very clear about. Councils charge a fee (typically a few hundred pounds), and if they agree with you they can issue a remedial notice ordering the hedge reduced to a height worked out using the official hedge height and light-loss formula. Interestingly, you can even complain if the hedge contains protected trees — the council simply assesses it like any other case.

The single tree (the hard one)

One mature oak or sycamore casting a lovely, generation-killing shadow? No statutory shading remedy exists. Your angles are: cutting overhanging branches back to the boundary (check for a Tree Preservation Order or conservation area first — those make cutting an offence); reporting a dangerous or diseased tree to the council’s tree officer; and nuisance claims if debris is causing provable damage. Annoying, I know — but knowing this saves you a solicitor’s letter you can’t win.

⚖️ Planning law: your biggest stick (the 2019 case that changed things)

If the threat is a new extension or building rather than a growing tree, you’re on much stronger ground. In McLennan v Medway Council [2019] EWHC 1738 (Admin), the High Court quashed a planning permission for a house extension because the council had failed to treat the overshadowing of the neighbour’s solar panels as a material consideration. The judge’s reasoning is worth quoting in any objection you write: no matter how small one property’s panels contribute to renewable energy, that contribution is not immaterial — climate change is a legitimate planning issue.

Practically, that means:

• When a neighbour submits plans that would shade your array, object in writing during consultation, citing the case and attaching evidence — your monitoring app’s generation data beats adjectives every time. (Here’s my roundup of the best solar monitoring apps to pull that data from.)
• Developers in London and beyond now increasingly run daylight-and-sunlight assessments that include existing PV, because shading liability is an emerging risk for them.
• The honest caveat: some overshadowing — particularly loft conversions — arrives via permitted development, so there’s no application to object to. The Greater London Authority has openly acknowledged this gap. In those cases, the tech fixes in the next-but-one section become your plan A.

If you’re the one adding panels and worrying about objections, my guide to solar panel planning permission covers where you stand.

📜 The 20-year ‘prescription’ angle — tempting, but untested

You’ll read online that solar panels could acquire a private easement of light after 20 years of uninterrupted sunlight, by analogy with windows under the Prescription Act 1832. Some legal commentators think that argument is genuinely arguable; no reported case has yet established it. And remember the trap: a neighbour can interrupt your 20-year clock by registering a light obstruction notice. My advice: treat prescription as a debating point, not a plan. The first three routes are the ones that actually resolve disputes.

📉 What the shade is really costing you in 2026

Shade is cruel to solar in a non-linear way. Because cells are wired in series, shading a sliver of one panel can drag the whole string down — industry figures suggest shading as little as 5–10% of a panel’s surface can cost that string 30–40% of its output on a string inverter. That’s the physics behind “my panels are fine but my winter is dead”.

Let me put pounds on it. Take a typical 4kWp UK system producing roughly 3,500 kWh a year, and value each kWh at a blended ~20.5p — half saved against the 26.11p/kWh price cap (from 1 July 2026), half exported at around 15p on a tariff like Outgoing Octopus. (Both figures match my site’s live tariff data.)

🔌 Tech fixes to try before any lawyers (usually cheaper than the argument)

In my experience, most tree-shade disputes are won or lost on hardware, not law. In rough order of value:

And if your roof is genuinely tricky — north-facing, chimneys, that one stubborn sycamore — don’t assume solar is dead. My guides on north-facing roofs and solar in cloudy UK weather show how much diffuse light is still on the table.

🤝 The neighbour conversation (a script that doesn’t end in a feud)

Twenty years in this industry and I’ll tell you the secret: most hedge disputes end with a crown-lift and a shared cuppa, not a remedial notice. A professional crown lift or side prune — which keeps the tree healthy and your neighbour’s privacy — often costs a few hundred pounds, a fraction of what the shade steals from you. My suggested ladder:

🧭 Which route applies to you? The cheat-sheet

Before you buy a system on a shaded plot, do the boring things: check the council’s TPO map, run a shading survey, and read my payback period guide — shade is the single biggest silent extender of payback. (And if you’re curious how your postcode stacks up for sun, my sunniest vs least sunny postcodes piece is a fun reality check.)

❓ Frequently asked questions