Stand outside any letting board on Clapham High Street for ten minutes and you'll see it: a viewing, then another, then a couple already filling in a holding form on their phone before they've left the pavement. The queue is real. And this week the numbers caught up with what we've been living down here all summer.
Advertised rents across London rose 9.8% in August. That is not a typo, and it is not annual growth dressed up as a monthly figure - that is where asking rents landed last month as landlords listed higher. At the same time, flatshare supply fell 3.2% and room rents hit a fresh record high. Fewer rooms, fewer flats, more people chasing them. Nationally, gross rent on the average landlord's portfolio has climbed to somewhere between £88,454 and £90,000 a year, and rental growth is now accelerating across five English regions since the Renters' Rights Act landed.
So what is actually driving it? Part of it is the Act itself. With Section 21 gone and rent reviews tightened, a lot of landlords are front-loading: if you can only realistically move the rent once a year through a formal process, you set it higher at the start. That is not greed, it is arithmetic, and it is showing up in the asking prices from Stockwell to Streatham. The other part is plain supply. Every landlord who has sold up over the last two years, spooked by tax and regulation, is a flat that has left the rental pool for good. Down here, where two-bed conversions off Abbeville Road and around Clapham Common are the backbone of the market, that thinning stock bites hard.
If you're renting in SW London right now, the honest advice is to move fast and come prepared. Have your references, deposit and proof of income ready before you view, not after. A well-presented flat near the Common at a fair rent is gone in days, and the person who gets it is usually the one who could say yes on the spot. Stretching your budget by £100 a month to widen your search into Tooting or Balham will often get you far more than holding out for a bargain that isn't coming.
If you're a landlord, this is the moment to be careful, not cocky. A record asking rent means nothing if the flat sits empty for three weeks or the tenant leaves in six months because the price never stacked up. Voids are the quiet killer here - four in ten portfolios nationally are carrying them - and an empty month wipes out most of the gain from a punchy headline rent. Price it to let quickly to a good tenant who stays, and you'll almost always beat the landlord chasing the top of the market.
My take: this is a supply problem wearing a price-rise costume. Rents aren't high because tenants suddenly have more money - they're high because there isn't enough to go round. Until we get more homes into the SW London rental market, not fewer, this pressure isn't easing. And every well-intentioned rule that nudges another landlord towards selling makes it a little worse for the renters it was meant to help.
Are you feeling the squeeze on the rental market in Clapham - as a tenant or a landlord? I'd genuinely like to hear how it's playing out on your street. Drop me a line at jeroen@claphampropertyblog.com or call 07837 093554.





