Most lofts can be converted, but what is crucial is that there is enough achievable headroom. Ideally you need a minimum of 2.3m (7 feet 6 inches) to start with from the existing ceiling joists to the apex of the loft.
Therefore, once the new loft floor (about 200mm or 8 inches) and ceiling (about 100mm or 4 inches) is in place in the loft conversion, you will be left with a ceiling height of about 2m (6 feet 6 inches).
Take a look at the closest door to you the opening (if standard) is likely to be 1.981mm in height, which is just a touch under 2m. With this in mind, we hope you agree with us that if you can not achieve at least 2m then converting your loft simply isn’t worth it!