Your house did not gain £40,000. Cash terms, real terms, and which to trust

“Up 30% in ten years” sounds like a verdict. It is actually half a sentence, because the pound doing the measuring was itself shrinking the whole time. A house that rose 30% in cash over a decade in which prices in general rose 30% did not gain anything: it kept pace, in a more expensive world. Every trend chart on this site therefore comes in two versions, cash terms, the prices actually paid, and real terms, the same series restated in today’s money using the ONS CPIH inflation index, and the honest reading usually needs both.

Can a decade rise and fall at the same time?

Each district page publishes both readings, compounded from its own quarterly medians over its own window. E14’s runs Q4 2015 to Q1 2026, which is 9.75 years rather than a round ten, because the most recent quarters are still filling in and a partial quarter is not a measurement. Four districts, cash and real:

Four districts, four different sentences from the same two columns. Meanwood is genuine growth by either measure. Central Manchester had a decade of headlines about a boom, and after the adjustment most of it turns out to have been the currency shrinking. The Isle of Dogs is the cautionary row: compounded over the whole window, purchasing power there is down 34%, and an owner reading only the cash column would never see it. Battersea is prime London’s quiet decade, a cash line that barely moves and an adjustment that turns it into a loss.

The pattern generalises: most of urban England outside a few strong regional centres spent the decade flat-to-falling in real terms while nominal prices crept up. Both statements are true. Which one matters depends entirely on the question you are asking.

Which version answers your question?

Cash terms answers questions denominated in pounds you will actually exchange: what you will owe, what the mortgage covers, whether the sale clears the loan, what stamp duty costs. Debt does not inflation-adjust, which is inflation’s one great kindness to borrowers.

Real terms answers questions about value: did this area actually get more expensive, is that premium a growth story or a memory, how does a house compare against anything else you could have done with the money. Anyone selling you an area on its ten-year cash chart is, knowingly or not, showing you inflation and calling it growth.

How do you read a cash chart without being fooled?

Three habits do most of the work. Ask what the pound was doing over the same span: a decade in which prices in general rose by a third resets what “up a third” means, and the 2021 to 2023 inflation burst sits inside every ten-year window now quoted. Compare like against like: judging a cash gain against a real benchmark, or the reverse, is the commonest way an honest chart gets dishonestly read. And distrust round conclusions drawn from the gap between two compounding rates, because small annual differences compound into large span differences; the E14 row above is the demonstration, and it is why this site derives the span figure from the same payload as the rate rather than letting prose do the compounding from memory.

How is the adjustment made here?

The real-terms series restates every quarterly median in current prices using CPIH, the ONS’s broadest consumer-price index, so a pound in 1995 and a pound today buy the same basket. Districts with too short a published series say so rather than showing a half-adjusted line, and the toggle sits directly on every trend chart, cash is the default, because the prices are the record; real is one click, because the truth usually is. The glossary defines both, and the methodology page states the sources.

Check your own area’s decade both ways on its district page, or see the movers both ways in the league tables. Figures: HM Land Registry sold prices matched to EPC floor areas, August 2026 dataset, rebuilt monthly.