Buyers bid payments, not prices
Most buyers do not decide what a house is worth. They decide what they can pay each month, and the price follows from that. This is why borrowing costs move prices so directly. If the cost of borrowing falls, the same monthly payment supports a larger loan, and the amount people can bid rises without anyone becoming richer. If it rises, the reverse happens with equal force.
It also explains a common confusion. Cheaper credit is often described as making housing more affordable. It makes borrowing more affordable. Since almost every buyer is competing with other borrowers, the benefit is usually competed into the price, and what changes is the size of the debt rather than the ease of getting in.
Incomes set the ceiling, slowly
Over long periods, prices are anchored to what local households earn, because a payment has to come out of an income. Over short periods that anchor is loose: credit conditions, deposits from family, cash buyers, investors and second homes can all pull prices away from local earnings for years at a time. The anchor tends to reassert itself, but it is a slow rope, not a hard wall, and it can take a decade of flat prices rather than a fall.
Land and permission decide the shape of the response
When demand rises in a place where land is available and building is straightforward, the response is more houses and only a modest price change. Where land is constrained by geography, ownership, infrastructure or planning, the same demand has nowhere to go except into price. Two towns with identical demand growth can therefore look completely different ten years later, and the difference is not about desirability at all.
Construction costs work the same way from the other side. If it costs more to build a house than a finished house sells for, building stops, whatever the demand is doing.
Friction: why prices fall slowly
Selling a house is expensive and slow, and the seller usually has to live somewhere in the meantime. When demand weakens, sellers do not immediately cut. They wait, then withdraw. Volumes fall first, prices later, and often by less than the fall in activity would suggest. In a weakening market the honest early signal is the number of sales, not the average price.
The local facts that do the rest
- Access: travel time to work, and whether that time is reliable rather than merely short.
- Schools: catchment boundaries can price two identical houses differently, and can move.
- Aspect and grade: which way the garden faces, and where the water goes in heavy rain.
- Noise and edges: main roads, rail lines, flight paths, industry, and the boundary between two very different kinds of street.
- Condition and cost to fix: a roof, a heating system or a damp problem is priced in as the cost of the work plus the inconvenience of arranging it.
- Tenure and charges: shared drives, service charges, easements and covenants all narrow the pool of buyers, and a narrower pool means a lower price.
What does not move prices as much as people expect
Decoration is the clearest example. Cosmetic work rarely returns its cost, because buyers discount visible faults heavily but do not pay a premium for taste they may not share. Extensions and conversions return more, but usually less than they cost, and they run into a ceiling: the price of the best house on a street is set partly by the street.