A housing market is easy to describe badly. It is usually talked about as a single national thing that goes up or down, as though every street were a share in the same company. It is not. It is thousands of small, slow, overlapping markets, each made of a handful of properties that happen to be for sale in a particular few weeks, and each dominated by the fact that the goods are enormous, immovable, expensive to trade and impossible to standardise.
Almost everything that seems strange about housing follows from those four properties. Understanding them first makes the rest of this site much shorter.
Stock, flow and the small number that sets the tone
The stock of housing in any area is very large. The flow, meaning the number of homes changing hands in a given month, is very small by comparison. In an ordinary year only a small fraction of the homes in a street or postcode will be sold at all. Prices are therefore set at the margin: by the few transactions that actually happen, not by the many that do not.
This is why the price of a street can appear to move sharply on very thin evidence. If three similar houses sell in six months, those three sales become the reference points that every valuer, lender, buyer and seller uses for the next year. If none sell, the market has no new information and simply carries the old numbers forward until something breaks the silence.
It also explains the lag everyone complains about. When conditions change, the first thing that moves is not price but volume. Sellers who do not have to move withdraw. Buyers who do not have to buy wait. Transactions dry up long before asking prices adjust, because a seller can hold out in a way that a shareholder cannot.
Asking price, offer, agreed price, achieved price
Four different numbers get called "the price" and they are worth separating, because most confusion about a market comes from comparing one with another.
The four prices
- Asking price
- The number the property is advertised at. It is a marketing decision and reflects the seller's hopes, the competitive set on the day and, sometimes, a deliberate strategy of pitching low to gather offers.
- Offer
- What a buyer says they will pay. Until it is accepted it is only information, and in most of the United Kingdom it carries no legal force at all.
- Agreed price
- The figure both sides settle on when the sale goes under offer. This is where the process starts, not where it ends: surveys, searches and lending decisions all sit after it.
- Achieved price
- What actually changed hands at completion, after any renegotiation. This is the only number that belongs in a record of what a market did.
The gap between asking and achieved is one of the more honest indicators of a local market's condition. When it narrows towards zero, and sometimes inverts, demand is ahead of supply. When it widens, and when properties are relisted at lower asking prices after long periods unsold, the market has already turned even though the headline averages will not show it for months.
Chains, and why they dominate everything
Most buyers of an ordinary home are also sellers of one. Their purchase depends on their sale, whose buyer depends on their own sale, and so on. This is a chain, and it is the single most important mechanical feature of a residential market.
A chain has two consequences. First, it makes transactions fragile in a way that is disproportionate to their size: any one link failing can collapse several unrelated sales that were themselves perfectly sound. Second, it makes buyers who are not in a chain genuinely more valuable than their money alone suggests. A first-time buyer, a cash buyer, or someone who has already sold and moved into rented accommodation is offering certainty, and certainty is worth real money to a seller with a deadline.
Chains also explain why housing markets seize rather than fall smoothly. A chain does not slow down; it either completes or breaks.
Illiquidity, heterogeneity, and the cost of being wrong
No two houses are the same. Even two identical terraced houses on the same street differ in orientation, condition, extension history, boundary detail, neighbours and the state of the roof. That heterogeneity is why valuation is an act of judgement rather than arithmetic, and why comparable evidence is always adjusted rather than copied.
Illiquidity is the other half. Selling a home takes months, costs a meaningful percentage of its value in fees and taxes, and cannot be done in halves. That transaction cost puts a wide band around the price at which it is rational to trade at all, which is why owners often stay put through conditions that would make an investor in a liquid asset sell immediately.
Why the town next door behaves differently
Local markets diverge because the things that drive them are local. A town with one dominant employer moves with that employer. A district where most homes are Victorian terraces has a supply that cannot grow much and a buyer pool concentrated in one or two life stages. A place that has just gained a fast train service is repricing its commuter access, not its bricks.
Two markets that look adjacent on a map can therefore be entirely different in structure: different tenure mix, different typical buyer, different sensitivity to interest rates, different seasonal rhythm. National statistics average across all of this and describe none of it.
How a single sale moves through the market
Listing
A property enters the visible market at an asking price set against whatever comparable evidence exists that week.
Discovery
Interest is tested. The first two or three weeks generate most of the viewings a property will ever get.
Agreement
An offer is accepted and the property comes off the visible market, though nothing is yet binding in most of the UK.
Verification
Survey, lender valuation and legal searches test whether the agreed price and the property's actual condition and title agree.
Renegotiation or confirmation
Findings are either absorbed, priced in, or fatal. This is where most agreed sales change number or die.
Completion
Money and title move. Only now has the market learned anything, and the achieved price becomes evidence for the next sale.
Reading a market without being misled
A few habits help. Look at volumes as well as prices, because volume turns first. Look at time on market and at relistings, which are harder to dress up than averages. Compare like with like: a shift in the mix of what is selling can move an average price without any individual home changing value. And treat any single month of local data as noise, because in a market this thin, it usually is.