Census 2021 puts Clapham at 21,167 households with a median age of 31.9. The Georgian and early Victorian stock is mixed-tenure, which is why 24% houses and 76% flats need different handling in SW4.
34% of households rent privately and 37% own, which is why BBQ cleaning demand here peaks around tenancy changeovers and completion dates.
Clapham substrates run to with solid brick on the party and external walls, over lath and plaster over timber studs — the reality on the streets around Clapham Common. Nothing is drilled until the wall has been sounded, because a plasterboard plug spun into lime plaster in Clapham, which crumbles the key and drops the panel — measured on the walk in from Clapham Common (Northern) rather than assumed from a map is the mistake that costs a SW4 customer twice.
Two streets can behave very differently in Clapham: the Common, Abbeville Village and the Old Town's Georgian houses. The quote reflects the street the job is actually on. Clapham sits inside the Congestion Charge zone as well as ULEZ, so both are itemised on the quote rather than absorbed into an hourly rate.
Getting to the door matters as much as the job: very tight CPZ hours, narrow terraces and share-house turnover every summer. Clapham Common (Northern) is the nearest station, and one technician with a van-mounted dip tank; two where a barbecue has to be carried through a flat to reach a terrace.