Do I need planning permission for solar panels on the Isle of Man?
The short answer
Usually not on a pitched roof. You do need it for a flat roof, a conservation area, or a registered building.
Roof panels are permitted development under Class 42 of the Permitted Development Order 2025, as long as they sit within 200mm of the roof slope, stay below the ridge and are not on a horizontal roof. Garden arrays are permitted under Class 22, up to 9 square metres.
Planning on the island runs under its own legislation, so British guidance does not apply and the differences are real. Everything on this page is quoted from the Town and Country Planning (Permitted Development) Order 2025, SD No. 2025/0027, which we read in full rather than summarising someone else’s summary of it.
One thing to hold on to throughout: planning permission and Manx Utilities’ approval are two completely separate things. Getting one does not get you the other, and you need both. The main solar panels guide covers the Manx Utilities side.
Panels on a roof: Class 42
Class 42 covers installing, altering or replacing solar photovoltaic or solar thermal equipment on the roof of a building. It carries three conditions, and all three must be met:
Within 200mm of the slope Condition
The equipment must not extend more than 200mm beyond the plane of the roof slope.
Below the ridge Condition
It must not be higher than the highest part of the roof, not counting any chimney.
Not on a flat roof Excluded
It must not be situated on a horizontal roof. A flat roof falls outside Class 42 entirely.
That third condition is the one people miss, and it is a genuine difference from Britain. A flat-roof installation almost always needs a frame that tilts the panels up, and the order simply does not cover panels on a horizontal roof. If your roof is flat, assume you need a planning application and ask Planning and Building Control before you commit to anything.
Panels in the garden: Class 22
A stand-alone array in the curtilage of a house is covered by Class 22. The limits are tighter than most people expect, and 9 square metres is not very much: roughly four or five modern panels.
| Limit | What the order says |
|---|---|
| How many | No more than one stand-alone array within the curtilage of a dwellinghouse |
| Total panel area | Must not exceed 9 square metres |
| Size of the array | No dimension of the array, including any housing, may exceed 3 metres |
| Height | No part higher than 2 metres above ground level |
| Distance from a road | Where a highway bounds the curtilage, no nearer to it than whichever is nearer: any part of the house, or 20 metres |
| Trees | Not closer to a tree than the required distance |
The general conditions that also apply
Class 22 also picks up the general conditions in paragraph 15 of the order, which apply to most things you might build in a garden. A ground-mounted array must not be:
- within 9 metres, measured at ground level, of an overhead electrical line carrying 11kV or more
- within 9.1 metres of the bank of a watercourse designated under the Flood Risk Management Act 2013
- built where it would take buildings past 50% coverage of the rear curtilage
- built so as to leave fewer than two parking spaces of at least 6 metres by 3.25 metres, or fewer than you had before
Note that these are roof panels’ quiet advantage. None of the paragraph 15 conditions apply to Class 42, because a roof is not a garden.
Conservation areas: the big difference
Inside a conservation area, the order swaps Schedule 1 for a shorter list in Schedule 2. Only the classes on that list stay permitted. The full list is Classes 13, 14, 15, 18, 19, 21, 22, 23, 23A, 24, 24A, 25, 28, 29, 38 and 41.
Class 42 is not on that list. So in a conservation area on the Isle of Man, roof-mounted solar panels are not permitted development, and you need a planning application even for an ordinary pitched roof that would be fine anywhere else.
Class 22 is on the list, so a garden array is still permitted in a conservation area, but Schedule 2 adds that the development may only take place in the rear garden.
| Where your home is | Panels on a pitched roof | Array in the garden |
|---|---|---|
| Ordinary location | Permitted under Class 42 | Permitted under Class 22 |
| Conservation area | Application needed | Permitted, rear garden only |
| Registered building or its curtilage | Application needed | Application needed |
| Any flat roof | Application needed | Not applicable |
Registered buildings
Article 5 of the order says that no part of a development under either schedule may fall within the curtilage of a registered building. There is no solar exception. If your house is registered, or your garden falls inside the curtilage of one, both roof panels and a garden array need a planning application.
Article 5 also rules out anything that would contravene a condition on an existing planning approval, form or widen a vehicle access, dangerously obstruct a road user’s view, or involve felling, lopping or limbing a tree.
If you are not sure, ask, and keep the answer
Planning and Building Control will give you an informal written answer. Complete their “Do I need planning approval” form and email it, with your supporting documents, to planningqueries.DEFA@gov.im. They aim to reply within 10 working days, though complex queries take longer.
Keep that reply. Planning and Building Control point out that if the answer is that no application was needed, it is the document you show a solicitor years later when you sell. For an answer that is legally binding rather than informal, you apply for a Certificate of Lawfulness.
One practical note: they will not tell you over the telephone or at the duty planner drop-in whether you need permission. It has to be the form.
All quotations and conditions from the Town and Country Planning (Permitted Development) Order 2025, SD No. 2025/0027, downloaded from Planning and Building Control and read in full on 28 September 2026. This is a plain-English summary of what the order says and not legal advice. If anything here matters to a decision you are making, check with Planning and Building Control.
Related guides
- Manx Utilities approval for solar panels
- How to choose a solar installer
- Is there a solar panel grant on the Isle of Man?
- Heat pump grants on the island
- Solar, heating and hot water
Common questions
Do I need planning permission for solar panels on my roof?
Not usually, if the roof is pitched, you are outside a conservation area, the building is not registered, the panels sit within 200mm of the roof slope and they do not rise above the ridge. Miss any of those and you need an application.
Can I put solar panels on a flat roof without permission?
No. Class 42 says the equipment must not be situated on a horizontal roof, so a flat roof is outside permitted development and needs an application.
What about a conservation area?
Roof-mounted panels need a planning application, because Class 42 is not among the classes that stay permitted in a conservation area. A stand-alone garden array is still permitted under Class 22, but only in the rear garden.
How big can a garden solar array be?
Up to 9 square metres of panels, with no dimension of the array over 3 metres and nothing higher than 2 metres above ground. One array per property. There are also distance rules for overhead lines, watercourses, roads and trees.
Does planning permission mean I can connect the panels?
No. They are separate. You still need written approval from Manx Utilities before anything is connected to the network, whether or not you want to export. See the solar panels guide.