Loft Conversion Head Height - is there a minimum requirement?
About 20 years ago there was a minimum head height requirement within the Building
Regulations of 2.3M. This was done away with to allow greater design flexibility but many house extension designers
today still use this head height as the norm.
Fortunately most loft conversions do not actually have a large area of flat or horizontal ceiling as a lot of
the ceiling lines are sloping or scaling down to lower head heights. Therefore a 2.3M head height for a loft
conversion can be considered as very acceptable and feels very comfortable in most instances.
For some loft conversion rooms it is necessary to have a lower head height and this can go down as far as 2M.
This would still be approved under Building Regulations and can still be acceptable and very usable for most small
room loft conversions.
Should the loft conversion have very large rooms then any head height or floor to ceiling dimension less than
2.3M can start to feel very cramped and oppressive for a habitable room. However, often you can only work within
the void you have or perhaps the constructional constraints dictate a lower than standard floor to ceiling height
as each design, property, roof structure and clients requirements are all different.
As a rule, I would always suggest trying to obtain the tallest head heights you can for a loft conversion but to
also avoid the room going right up to the apex or ridge line as this can cause condensation and insect problems.
Always try to obtain some form of horizontal ceiling for a loft conversion and obtain a decent head height where