How to establish which council determines your address
Three checks settle it, and they are worth doing in this order. Start with the council tax bill, which names the billing authority and is almost always the planning authority as well. Confirm it against the electoral register entry for the address. Then run the address through the authority’s own planning constraints map, which is the record that actually governs: it returns the determining authority together with any conservation area, Article 4 direction, listed building, tree preservation order and flood designation affecting the property. Save a dated copy of that result. It costs nothing and it becomes the document that answers the question later, when a contractor or a neighbour asserts something different. Two traps catch people on this street pattern. The first is the postal address, which follows delivery geography rather than administrative boundaries and is worthless as evidence — N4 covers parts of three boroughs. The second is the name of a nearby conservation area, which here is actively misleading, because the designation called Stroud Green is administered by Islington while the locality itself is in Haringey. Where the boundary runs close to the property, or where the garden appears to cross it, the authority’s own mapping resolves the position, and a short written enquiry to the planning department will confirm it in writing if any doubt remains. That confirmation is cheap insurance against designing to the wrong policy for three months.
