In Roupell Street almost everything is old terraced houses with solid walls, and the rules hinge on the façade. Internal wall insulation and loft insulation, panels on the roof slope, a heat pump at the back or to the side need no permission; external wall insulation and a heat pump on the wall facing the road do need planning permission. That is how the rules work in every conservation area.
What you can actually do with houses like these
According to the EPC register for November 2026, 73 of the 77 houses (95%) have uninsulated solid walls, 97% are on gas, and there are no heat pumps. Take an example: the owner of a terraced house wants to cut the bill. Loft insulation is missing at 22 houses and thinner than 200 mm at another 33, and that is work without any paperwork; insulation on the façade needs an application. At 16 Grade II buildings you also need listed building consent.
Lambeth's Article 4 direction covers about 1% of the area; what it removes is set out in its text, held by the council. Nearby are Waterloo and Mitre Road & Ufford Street. The national rules are as at 21 October 2026, and the decision rests with Lambeth council.