Housing desk / How the market works
How a local housing market actually works
A housing market is not one market. It is thousands of small ones, each with a handful of buyers, a handful of sellers and very few completed sales in any given month. Almost everything that seems strange about house prices follows from that.
Stock, flow and the very small number of sales
At any moment a town contains a large number of homes and a tiny number of homes for sale. The large number is the stock. The tiny number is the flow. Prices are set entirely by the flow, which is usually well under one home in twenty changing hands in a year, and yet the resulting figure is then applied in conversation to the whole stock.
This is why a small change in the number of willing buyers can move prices a long way. If a street has two homes on the market and five interested households, the outcome is very different from the same street with five homes on the market and two interested households, even though the street itself has not changed at all.
It also explains the lag people notice. When conditions turn, sellers do not immediately cut prices. They withdraw. Sales volumes fall first and prices follow months later, because a seller who does not have to move can simply wait, and most sellers do not have to move.
Every home is a different product
Shares in a company are interchangeable. Homes are not. Two houses built to the same plan in the same year differ by aspect, garden depth, what the neighbour did to their roof, whether the road is used as a shortcut, and how the last owner treated the damp course.
Because the product is not standard, there is no single price, only a range of plausible prices whose width reflects how uncertain everyone is. Valuation methods try to narrow that range by comparison, which works well where similar homes sell often and works badly for anything unusual. The more distinctive the home, the wider the honest range and the more the eventual figure depends on who happened to be looking that month.
Transactions are slow and expensive, and that shapes behaviour
Moving costs real money in fees, taxes, survey work and removal, and it costs weeks of attention. Those costs act like friction. They stop people from moving for small gains, which keeps the flow small, which in turn makes prices jumpier.
Friction also produces the chain. A household that must sell to buy is linked to another household in the same position, and the whole line moves on the day the slowest link is ready. Chains are not a legal structure. They are the practical consequence of most buyers being sellers at the same time.
Why one street differs from the next
Local price differences persist for reasons that are physical and administrative rather than mysterious: which school an address is inside, which side of a railway line it sits on, whether parking is controlled, how far it is to a station entrance, whether the road floods, and what the buildings themselves are made of.
Some of these boundaries are sharp. A catchment edge or a controlled parking zone can put a visible step in prices between two adjacent streets that look identical. Others are gradients, such as walking distance to a station, and show up as a smooth decline over a few hundred metres.
Reading local evidence without fooling yourself
Asking prices tell you what sellers hope for. Sold prices tell you what happened, but they are recorded weeks or months after the price was actually agreed, so a sold-price record is a photograph of the market as it stood some time ago.
The most useful local signals are usually the dull ones: how long homes sit before going under offer, how many have been reduced, how many are relisted after a failed sale, and whether the number of new listings each week is rising or falling. Those move before prices do.