Converting a House into Two Flats in London: Planning, Costs and Value

In short: Converting a house into two flats almost always needs planning permission, and many London boroughs protect family houses, so check local policy first. You'll also need Building Regulations approval for fire separation, sound insulation and escape routes, plus separate utilities and, usually, new leases for each flat. Costs vary widely, so compare the total cost with the combined value of the two flats. Fraser Bond can value the finished flats and let or sell them.