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Planning permission is often the first approval homeowners think about when planning an extension. However, receiving planning permission - or being able to build under Permitted Development - does not mean the project is technically ready for construction.

A well-planned loft conversion can create valuable living space without reducing the garden or requiring a move. In London, however, the right solution is shaped by much more than the size of the roof: staircase position, structure, fire safety, planning restrictions, access and the property's ownership all matter. This guide explains the main conversion types, the dividing line between Permitted Development and planning permission, realistic 2026 construction budgets, approv