The residual method in one line
What is left after deducting the costs and the developer's margin from the value of the finished project is the most that can be paid for the land.
- Value of the finished project: the saleable or lettable area multiplied by the market price per m² for that product, in that location, when the project is complete.
- Construction and indirect costs: works, design, licences and fees, supervision, marketing and insurance.
- Finance costs: the cost of money during licensing and construction, which can last several years.
- Developer's margin: the return it requires for the risk it takes.
Why small changes weigh so much
A hypothesis in units of account, not euros, chosen only for the arithmetic: it describes no particular plot and no market price. Value of the finished project: 100. Construction costs: 45. Indirect costs: 10. Finance costs: 8. Developer's margin: 15. Residual land value: 100 − 45 − 10 − 8 − 15 = 22.
If the value of the finished project is 5% lower, that is 95, and costs and margin stay the same, the residual value falls to 17. A 5% change in the value of the project takes about 23% off the value of the land, because the whole difference falls on the residual.
That is why more buildable area, or one year less of licensing, moves the price so much. And it is why each buyer arrives at a different number: it runs the calculation with its own product and its own cost of capital.
What the buyer needs to know to run the numbers
The biggest risk in land is not construction, it is not knowing what can be built there, or when. Whatever reduces that uncertainty raises the price: the parameters of the municipal master plan or of a detailed plan, a favourable answer to a Prior Information Request (PIP), an approved project. Constraints (ecological or agricultural reserve, easements, heritage, missing infrastructure) enter the calculation if they are known early, and are used to lower the price if they only surface in due diligence.
The residual method is cross-checked against comparable transactions, usually expressed in euros per m² of buildable area, which anchor the calculation in what the market has recently paid.
What to gather for an indicative valuation
- an up-to-date land registry certificate and tax record;
- extracts from the master plan and the constraints maps;
- whatever exists from the municipal file (PIP, projects, opinions, licences);
- information on encumbrances, charges, leases or occupations.
Common mistakes when setting the price
- setting the price by what the neighbour's plot “sold for”, without running the buyer's calculation;
- going to market without the planning information gathered, and watching the price fall in due diligence;
- advertising on portals, which exposes the land and attracts intermediaries, not buyers;
- negotiating with a single developer, without competitive tension.
With or without a licence: what changes in the calculation
Each step already taken, such as a favourable PIP, an approved architectural project, a subdivision permit or a building licence, is risk and time the buyer no longer has to bear. In the residual calculation, that shows up as lower finance costs and less uncertainty, and therefore as a higher price. But taking those steps before selling costs money and time, and does not always pay off: the decision depends on location, type of buyer and the owner's timeline.
Next step
Harbor Partners prepares an indicative valuation of the land, with no commitment, before any decision is taken. For the full process, from preparation to the contract, read our guide to selling land.
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