Every figure on this site gets recalculated monthly from live listings, which means we can now answer a question a single snapshot never could: which UK postcodes actually moved this month, not just which ones have a high or low yield right now.
The biggest movers, month over month
The stand-out story this month is two central London postcodes that started in the same place and ended up worlds apart. WC2A (Covent Garden/Holborn) and SW1A (Westminster) both sat at a 4.6% gross yield last month. WC2A jumped to 10.0%, the biggest genuine gain we found. SW1A went the other way, down to 1.8%, as its already-high average buy price climbed further against a smaller rent increase. NE4, in Newcastle, kept climbing from an already-strong 12.3% to 14.1%. NG9, in Nottingham, cooled from 8.9% to 6.9%, on a sample large enough (130+ live rentals) that it's not just noise.
A stricter bar for what counts as a "move"
We tightened this ranking's data-quality bar this month. Alongside the existing rule that excludes any month where the yield looks implausibly high (above 20%, almost always a holiday-let or serviced-accommodation listing slipping past our filters), we now also require at least 15 live rental listings in the latest month before a postcode's change is eligible to appear here at all. Checking the previous rule alone against live data, we found postcodes with only 5-12 rental listings routinely showing 2-5 percentage point "swings" between adjacent months that were really just which handful of listings happened to be live that month, not a real market shift. The new floor cuts that noisy tail while still leaving well over 90 postcodes each way to rank, gainers and losers alike.
Why a single month's move is a starting point, not a verdict
A single month-over-month change can reflect real market movement, but it can also reflect normal listing turnover, especially in postcodes with a smaller sample of live listings. Treat this list as somewhere to look closer, not as a verdict on any one postcode. Check the individual district's own page for its fuller history and current sample size before acting on a single month's swing.
See the full biggest yield gainers and biggest yield drops rankings, or run your own numbers with the buy-to-let cashflow calculator.
Figures are gross averages from live market listings as of publication, comparing the two most recent calendar months of data. Not a forecast or a valuation of any individual property. Not financial advice.