The proposed dwelling would be out of character with the adjacent pair of semi-detached dwellings in terms of its width and design, and would not relate to the surrounding properties resulting in an unwarranted visual intrusion that would undermine the established street scene causing unacceptable harm to visual amenity, contrary to Policies HD18 (General Design Requirements), H5 (New Residential Development) and SPG10 (New Residential Development) of the Liverpool Unitary Development Plan.