In general, you will not require planning approval for: constructing a rear expansion that does not increase the original floor space of the home by more than 40 square metres and is not taller than the house. This applies even if the extension is made from brick or stone rather than wood or metal. However, there are exceptions to this rule. For example, you will need planning permission if: the extension increases the height of the building above ground level; it contains seven or eight rooms or more; and/or it faces onto a public road. In some cases, local authorities may also have requirements for services such as water, gas, electricity or drainage. It is important to understand that, in general, extensions will need to be approved by your local council. However, there are situations where councils may be willing to provide an exception to this rule. If you are considering extending your house, then discussing these issues with your local planner will help ensure that everything is considered before any plans are drawn up.