What is your land actually worth?

Ask what an acre of development land is worth and you will get a figure. It will usually have come from something a cousin sold in a different district four years ago, and it will be wrong — sometimes by a factor of three, in either direction.

The reason is that development land has no intrinsic price per acre. What a buyer will pay is a residual: it is what is left over after everything else in the scheme has been paid for. Change any input and the residual moves, often violently.

How the number is actually built

A housebuilder’s land team starts at the top of the scheme and works down:

• Gross development value. The number of homes the site will take, the mix, and what each will sell for in that specific location.
• Build costs. Construction, externals, infrastructure and contingency.
• Abnormals. Ground conditions, drainage, services, demolition, remediation, highways works. This line ruins more sites than any other.
• Planning obligations. Affordable housing, Section 106 contributions, the Community Infrastructure Levy, biodiversity net gain.
• Fees, finance and sales costs.
• Profit. The margin the board requires on gross development value before it will approve anything.

What remains after all of that is the land value. It is the last number in the calculation, not the first — which is why two adjoining fields with identical acreage can be worth very different sums.

The three things that move it most

Planning status. The gap between land with permission and land without is the largest single variable, and it is not a percentage uplift — it is a different asset. Everything else is a rounding error by comparison.

Density and mix. How many homes the site will realistically take, at what sizes, and how much of it must be affordable. An assumption of forty units against thirty changes the residual more than most landowners expect.

Abnormal costs. Every buyer prices the unknown pessimistically. Site information that removes uncertainty — a topographical survey, ground investigation, a drainage strategy, a confirmed access — frequently pays for itself several times over, because it lets a bidder delete a contingency they would otherwise have had to assume.

Why a single offer tells you very little

Each of the inputs above is an assumption, and different buyers hold different ones. A regional builder with a strong sales rate in that town, a lower cost base and an appetite for the site will arrive at a materially higher residual than a national with a full pipeline and a higher hurdle rate.

That is the real argument for competition. Not that it makes buyers bid against each other — though it does — but that it finds the buyer whose assumptions happen to suit your site. On the same land, on the same day, that spread is routinely the difference between a fair price and a good one.

What to do before you talk about price

1. Establish the planning position honestly: what is realistically achievable here, and on what timescale.
2. Sort the title, access and rights position out. Unresolved access is the most common cause of a discount.
3. Get a residual appraisal built the way a buyer builds one, so you can read an offer against it rather than against a rumour.
4. Decide the route to market before you engage with anyone — because the first person to make you an offer is rarely the person who will pay the most.

General information, not advice. Every site is different, and a proper answer needs a look at yours.