Commentary on Sections Part 4: Additional Planning Control. Section 105: Control of demolition in conservation areas
This section prevents the demolition of unlisted buildings in conservation areas without consent.  Such buildings cannot be demolished without the consent of the appropriate council or Department.  The Department may specify by direction buildings to which this section does not apply.  An addition to this section, following the judgement in Shimizu (UK) Ltd v Westminster City Council, provides that structural alteration of buildings to which this section applies, where the alteration consists of partial demolition, will also require consent.