...if the loft space is to be upgraded and used as a glorified storage space, NOT a bedroom? ie upgraded as in: floored, plaster-boarded walls and ceiling, velux windows but not to be used as a bedroom?[/b]
Permitted development Planning Consent. This is entirely separate from Building Regulations Approval. Once you stick a staircase up to a loft it automatically becomes a habitable room and subject to Building Regulations and all that that entails. Technically if you do not proceed with getting Building Regs approval your conversion will be deemed illegal.
Having said all that, a fire door separating the loft from the rest of the dwelling would be good and better than nothing but in itself is only a small part of all of the separate modifications that Building Regulations deem necessary to provide when converting a loft.
So in answer to your question adding a fire door to separate the loft from the rest of the house on its own will not make it a legal conversion.
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