Building warrants and planning are separate
Scotland has two different consent systems that can touch a solar project, run by two different teams at the council.
Building standards deal with safety and construction: whether the structure is sound, whether the work is done to the technical standards, whether anyone is put at risk. Where a job needs it, the consent is called a building warrant, and it has to be in place before the work it covers begins.
Planning deals with appearance, location and the effect on neighbours and the area. For most homes, roof panels are permitted development under Class 6HA of the Scottish permitted development order, inserted by the 2024 amendment order with effect from 24 May 2024 (the order, Part 1A; SSI 2024/102). There are exceptions: listed buildings and World Heritage Sites, and some roof slopes in conservation areas.
Being clear on one does not settle the other. Panels can be permitted development and still need a building warrant because the roof needs strengthening. Equally, a roof that needs no warrant can still need planning permission because the house is listed. The planning permission guide covers the planning side in full; this guide covers the building standards side.
| Question | Building warrant | Planning |
|---|---|---|
| What it checks | Structure, safety, technical standards | Appearance, location, effect on the area |
| Who decides | The council's building standards team | The council's planning team |
| Usual answer for roof panels on a one or two-storey house | Not needed if the roof can take the load, in one council's published guidance | Usually permitted development under Class 6HA |
| What changes the answer | Roof strengthening; flats and taller buildings | Listed buildings, World Heritage Sites, some conservation area slopes |
| Where the rule is written | West Lothian Council guidance (one example) | Permitted development order, Part 1A |
What one council's guidance says
This guide found no single national statement on building warrants for domestic solar. The clearest published guidance found comes from West Lothian Council. Its page on whether a building warrant is needed says (West Lothian Council):
- A building warrant is not required for solar or PV panels on the roof of a single or two-storey house, provided the existing roof structure can take the additional loading.
- If the roof structure does need strengthening, a building warrant is required.
- Separately, the same page says a building warrant is required for all alterations to flats and maisonettes, and that its minor-works exemptions do not apply to a flat, a maisonette or a house over two storeys.
That is one council's reading, published for its own area. Building standards in Scotland follow national regulations, so other councils are likely to take a similar line, but wording and practice can differ. Before work is booked, ask your own council's building standards team. A short email is usually enough to get an answer. Include:
- the address and the type of home: detached, semi-detached, terraced, a flat or a tenement;
- the number of storeys, counting any attic rooms;
- what the roof is covered with and roughly how old it is;
- the number of panels and how they would be fixed;
- whether any strengthening has been suggested.
Keep the reply with the rest of the paperwork. If the answer depends on a structural check, building standards will say so.
Can your roof take the load?
For a house of one or two storeys, this is the question that decides whether a warrant is needed. Panels, rails and fixings add weight that the roof was not designed for. They also catch the wind, which pulls as well as pushes, and in exposed parts of Scotland that can matter as much as the weight.
The firm designing the system should check the roof structure and confirm in writing that it can take the panels. A proper check looks at:
- the size, spacing and condition of the rafters, and any purlins supporting them;
- signs of past movement, sagging or water damage in the roof space;
- the roof covering itself, whether slate, concrete tile or clay, and how the fixings will pass through it;
- any earlier alterations, such as dormers, loft conversions or removed supports.
If the check is in doubt, ask for a structural engineer's opinion. That costs time, but it is far cheaper than repairing a roof that was overloaded. If strengthening is needed, the strengthening is building work that needs a warrant, and the warrant has to be granted before the work begins.
No warrant does not mean no rules. In Scotland, work that does not need a building warrant must still meet the building regulations, and the responsibility for that sits with the owner. That is one more reason to have the roof assessment in writing, from the firm that did it, and kept with your papers.
Be wary of a quote that never mentions the roof structure at all. A firm that will not go into the roof space before committing to a design is guessing. The guide to choosing an installer lists what a sound quote should include.
Flats, tenements and older roofs
Scotland's housing makes this more than a technicality. 32.4% of Scottish households live in flats (Scotland's Census 2022), and the Scottish House Condition Survey counts 23% of homes as tenement flats and 17% as built before 1919 (Scottish House Condition Survey 2024).
Flats. On West Lothian's guidance, panels on a flat fall outside the simple house exemption, so expect to need a warrant or at least a clear answer from building standards. A tenement is also usually more than two storeys, which takes it outside the house exemption on that same reading.
Shared roofs. In a tenement, building standards are only one hurdle. Under the Tenements (Scotland) Act 2004, the top flat's title extends to the roof over it unless the deeds say otherwise (section 2), and under the Tenement Management Scheme the roof is scheme property shared among the owners (Tenement Management Scheme). The scheme's majority decisions are about maintenance, and panels are an improvement, not maintenance. The guide to tenements and flats explains what that means for getting agreement.
Older roofs. Pre-1919 roofs were built to carry their own covering, not extra equipment, and many have been altered, patched or weakened over the years. Heavy natural slate already loads the structure, and stone gables and chimney heads add their own questions. These roofs often can take panels, but they need checking rather than assuming. The guide to stone-built and older homes goes into slate, chimneys and roof condition.
Steps before work starts
- Get the roof checked by the firm designing the system, in writing, with a structural engineer if there is any doubt.
- Ask building standards whether a warrant is needed, describing the house type, storeys and any strengthening. Keep the reply.
- Check planning separately. Confirm whether Class 6HA covers the home, or whether listed status, a World Heritage Site or a conservation area means an application.
- In a tenement, confirm roof ownership in the title deeds and get the other owners' agreement before anything else.
- If a warrant is needed, wait for it to be granted before work starts, and remember that warrant work ends with a completion certificate submitted to building standards.
- Keep everything together: the roof assessment, building standards' reply or warrant, planning confirmation, MCS certificate and grid notification. A buyer's solicitor may ask for them when you sell.
None of this is a reason to put off panels on a sound house roof. It is a reason to ask one clear question of the council early, and to make sure the roof has been looked at properly before anyone climbs a ladder. Once those answers are in hand, the cost guide shows what Scottish households paid per kW in the latest official figures.