Loft and extension work almost always adds a bathroom

Bathrooms rarely get their own planning application. Inside a house they usually do not need one. What needs consent is the space they go into: a loft conversion that gains an en suite, a rear extension with a downstairs shower room, a garage turned into a guest room with a wet room, an outbuilding converted into an annexe.

So the register is a list of rooms that are about to exist. A loft conversion with a rear dormer is nearly always an extra bedroom and an en suite. An annexe is a full second bathroom.

The council publishes the address and the decision. The fit-out happens months later. That is plenty of notice to get a quote in front of the owner while they are still choosing.

Watch prior approval applications as well as full ones. Larger rear extensions and many loft conversions travel that route. Application types explained sets out the difference, and what happens after a decision covers the conditions that decide when work can start.