Considering a loft conversion?
As a general guide, if you can measure 2.3 metres from the floor to the roof at the highest part, you have sufficient headroom for a loft conversion. To create a comfortable living room or bedroom, at least fifty percent of the loft area should be this high.
Houses built pre-war with steeply pitched roofs tend to be the easiest to convert, but there will always be structural considerations when converting this space and most lofts need additional support from steel beams to strengthen the roof and floor.
Building regulations stipulate that if the loft is to be converted into a bedroom, bathroom, study or games room, it must have a permanent staircase.
Where space is a premium, the stairs leading to it do not need to be as wide as the steps on the lower flights. The most minimal solutions resemble a fixed ladder or spiral staircase and although offer an attractive solution where space is tight, might not be that practical.
When weighing up the pros and cons of converting, look at the space you will absorb on the floor below to accommodate the new stairs and check in particular the head height available, 2 metres is the minimum.