Flat and pitched roofs have different limits
Under the England rules as amended on 27 August 2026, pitched-roof panels should project no more than 200mm from the slope and not exceed the highest part of the roof, while flat-roof equipment may not exceed 600mm above the highest part of the roof, excluding the chimney. Tell the installer which roof you have and ask for the mounting height in the quote.
Planning Portal: solar equipment mounted on a house (rules as amended 27 August 2026) ↗Source checked 2026-09-12.