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What Is My Land Worth? Residual Land Value Explained for Sellers

It is usually the first question a landowner asks me, and it deserves a better answer than a number plucked from the air. The honest answer is that development land is valued by working backwards from what can be built on it - a method called residual land value. Once you understand it, you can judge any offer you receive, mine included. This page explains it in plain English, with no jargon and no sales pitch.

The residual method in one paragraph

A developer starts with what the finished homes on your land would sell for - the gross development value, or GDV. From that they subtract everything it costs to get there: construction, professional fees (architects, engineers, planning), infrastructure and services, finance costs, sales costs, any payments the council requires as part of planning, and the developer's own profit margin, which their lender insists on. Whatever is left over after all of that is what the land is worth to them. That leftover is the residual land value, and it is the number behind almost every serious land offer you will ever receive.

Why two similar fields can have wildly different values

Because the value is a leftover, small changes at either end of the sum move it a lot. Things that push land value up: planning permission already in place, more homes achievable on the plot, good road access, mains services nearby, clean and level ground, and a strong local market for the finished houses.

Things that drag it down are what the trade calls abnormals - costs a standard site would not have. Demolition, contaminated ground from a former use, difficult soil needing engineered foundations, flood risk mitigation, ransom strips, awkward access, protected trees, or services that need diverting. Every pound of abnormal cost comes straight off the land value, which is why a buyer who has properly studied your site can end up offering less than one who has not opened a file on it yet. The second offer is not more genuine - it is just earlier in the process, and it usually falls once the surveys arrive.

What this means for you as a seller

Three practical lessons follow from how the method works.

Ignore headline price-per-acre talk. Farmland trades by the acre; development land does not. What matters is what can be built, not how big the field is. A small plot with permission for several homes can be worth more than a much larger field with no realistic planning prospect.

Planning status is the biggest lever. Land with permission is worth far more than land without, because the buyer's biggest risk has been removed. That does not automatically mean you should get permission before selling - applications cost real money, take time, and can be refused. It is a judgement call, and it depends on your site. If you want to understand the without-permission route first, I have written a separate guide on selling land without planning permission.

Ask every buyer to show their workings. This is the single best test of whether an offer is genuine. Anyone who has actually appraised your land has a breakdown of GDV, costs, and profit sitting behind their number. If they will not show it, be careful - a big round figure with nothing behind it is often designed to win your signature, then get renegotiated downwards once you are committed.

How I value land, and what I will show you

I use the same residual method the big developers use, and I show sellers the full breakdown as standard - the sale values I have assumed, the build and infrastructure costs, the fees, the profit margin, and the residual that is left for the land. If you think one of my assumptions is wrong, we can talk about it with the numbers on the table rather than arguing about a mystery figure.

There are no fees and no obligation at any stage, and I am happy to work alongside your agent if the land is already listed. I buy sites of all sizes across Nottingham and the East Midlands, from single plots to larger sites - including garden plots, which have their own quirks and their own guide. You can read more about how I work on the home page.

Common questions about land value

Because development land does not really sell by the acre. Two fields of identical size can be worth wildly different amounts depending on planning status, what can be built, access, services, and ground conditions. A price per acre is only meaningful for farmland traded as farmland. For development land, the value comes from what can be built on it, which is why serious buyers work backwards from the finished scheme using the residual method.
Usually yes, often dramatically, because planning permission removes the biggest risk a buyer takes on. But getting permission costs money, takes time, and is not guaranteed, and a refusal can make the land harder to sell afterwards. Whether to apply first or sell as-is depends on your site and appetite for risk. I buy land both with and without permission, and I am happy to talk through which route makes sense for yours before you spend anything.
Abnormals are site-specific costs over and above standard build costs - things like demolition, contamination clean-up, difficult ground needing special foundations, flood mitigation, diverting services, or an expensive access junction. They come straight off the land value in a residual appraisal, which is why a buyer who has studied your site properly may offer less than one who has not looked yet. A high early offer that ignores abnormals often falls once surveys are done.
If the land could be a significant sum, it is rarely a bad idea. A RICS surveyor or a land agent experienced in development sites can give you an independent view, and it gives you a benchmark to judge offers against. Even if you do not commission a formal valuation, ask any buyer to show you their appraisal workings. A genuine buyer who has done the sums will not mind showing them - I show mine as standard.

Find out what your land is worth

Call me, Ryan, on 01158 716 385 or use the form on the home page. No fees, no obligation, and I will show you the workings.