This is frequently possible under authorized development rights (unless it is a listed building or in a conservation area), which means no planning approval is required. The owner can change the use of the property as they see fit. If you're just looking to generate some extra money by renting out rooms, then this is easy to do. Just make sure that there are enough parking spaces for both the new house and the old one. It's also important to note that if you sell your home without having it renovated first, then you could be left with a negative equity situation where you lose money on the sale of your home. If you want to transform your bungalow into a family house, then you'll need to get planning permission from your local council. The type of plan you need depends on how much work will be involved in making the conversion happen. If you just want to add bedrooms or replace some windows, then you don't need planning permission. However, if you want to extend into the garden or build an extension, then you will need to apply for planning permission from your local council. It's important to remember that if you want to generate any income by letting out parts of your house, then you'll also need to check whether this is permitted under your planning control.