Alteration of existing conservatory to construct new single storey rear extension to a dwelling-house

Sub-division of existing dwelling into 2 separate dwellings with works to RH dwelling including demolition of existing conservatory and construction of two storey side extension and two storey/single storey rear extension, alterations to roof including raising of roof ridge height and new external steps to rear of property. Other external alterations including new access and new roof light to front elevation