Halifax town is stone terraces on hills: King Cross, Pellon, Skircoat Green, Boothtown and Ovenden all climb away from the centre, so the same street can have a south-facing row and a north-facing row. The south-facing stone-slate roofs take six to eight panels and the installer checks the timbers under the slate. The larger Victorian houses at Savile Park and round the Akroydon model village (a conservation area) have several roof pitches and usually a good one.
Brighouse, Elland and Rastrick in the valley bottom have the flattest sites in the district and a lot of inter-war semis and post-war estates, plus new-build along the Calder. These are the simplest Calderdale installs: a 3.5 kW system on a plain gable, a battery in the garage, done in a day. Lightcliffe, Hipperholme and Norwood Green above Brighouse have bigger stone semis and detached houses with room for 4 kW and a larger battery.
The upper valley, Sowerby Bridge, Mytholmroyd, Hebden Bridge and Todmorden, is where the famous over-and-under terraces stand: houses built into the hillside with one home above another, often with a single roof pitch and a steep one. A roof on the south side of the valley can be excellent; one in the shadow of the opposite hillside loses winter sun for weeks. We ask which side of the valley you are on before the survey is booked.