Cheap plastic cladding and an ungainly roof extension with no redeeming features.
Nasty zinc-clad boxy dormers with anti-pigeon spikes on top. Grim & forbidding.
If this kind of degradation of the built environment worries you, you should support a local conservation society of which the City has three: The Brighton Society, Hove Civic Society and the Regency society. They all have small planning committees or working groups who examine planning applications as they are published and comment or object as necessary. This helps to balance commercial pressures on the Planning Department and avoid unsympathetic changes to the streetscape.