It can be tempting to try and subdivide existing and new space into as many bedrooms as required, particularly if budget or the size of the extension permitted is restricted. However, there are minimum sizes beyond which rooms will not function.
When considering applications for conversions, most local authorities have recommended minimum room sizes which planning applications must conform to. However, the rules about sizes are more applicable to social housing and are usually relaxed for private accommodation, but you should still bear them in mind if you are extending.
|Function of room||Minimum Size|
|Bathroom and WC||3.6m²|
|Bathroom only||2.8m² (or 1m² of circ.)|
|Hallways and landings||900mm width|
In addition, rooms must always have external windows, with the exception of non-habitable rooms such as kitchens, bathrooms, dining rooms and studies.