A loft conversion also depends upon the structure of the roof. There are two prominent structures in houses – rafters and trusses. In case of trusses, you need an extra structural support and it will be more expensive. Roofs with rafters are much easier to convert. The space can be easily and inexpensively opened up by cutting the rafters and adding supports.
Another factor to consider before loft conversion is the floor below the attic. You should consider where staircases will be used. How much room will be exposed after conversion? This is important to consider because a well-designed staircase can take up more space.