Landscaping in Solihull is governed by one rule more than any other, and it is stricter than most people realise.
Any tree in a conservation area over 75 millimetres in diameter, measured at 1.5 metres above the ground, is automatically protected. Seventy five millimetres is about three inches. That is not a mature specimen, it is a tree somebody planted fifteen years ago, and it means a great deal more of the planting on a Solihull plot is protected than the owner generally assumes. No cutting, removal, damage or destruction is allowed without prior notification to the council, and wilful destruction of a protected tree without consent is a criminal offence carrying a maximum fine of £20,000.
We check before anything is quoted for removal, every time, and we would far rather redesign a layout around a tree than put a client in front of that fine.
Root protection areas are the practical extension of the same point. They reach further than the canopy, and a patio, a base or a retaining wall built through one can kill a tree slowly enough that nobody connects the two for five years. We set layouts around roots and build hard surfaces near trees in ways the roots can live with.
Garden buildings in the Green Belt are a separate question, since outbuildings out there are looked at more closely than they would be in town. Our landscaping page shows the range of the work.