The 1930s semi is the UK's most installed-on house type. Plain pitched roofs, accessible lofts, and just enough roof area for a 4 kWp install — sometimes 5.
A 1930s semi-detached typically suits a 4.0–4.5 kWp install at £6,500–£8,800 fitted in 2026. Hipped-roof variants lose 0.5 kWp of capacity; gable-end variants gain it back and then some. Loft inverter placement is the standard, with the battery downstairs in a utility room.