Take a share of the value the strip unlocks, then cap it with the cost of getting round it.
Start from the uplift the strip unlocks, the land value with access less the value without it, and take a share, traditionally one-third following Stokes v Cambridge Corporation (1961). Then cap it at what an alternative access would cost. On an illustrative 120-home site the uplift is 7,500,000 and one-third is 2,500,000, but a second route costing 1,770,000 means the strip is worth no more than 1,770,000, 14,750 a plot.
Worked in full in The Real Estate Development Manager by Julian R. Sterling, with every figure reproduced in a free workbook.See the book on Amazon →
A ransom strip is a piece of land, often only a few metres wide, that sits between a development site and the public highway or a service connection. Its owner cannot develop it, but the developer cannot build out without it. The strip's own existing use value may be negligible; its value to the developer is a share of everything it unlocks. Pricing it badly is one of the quickest ways to lose a land deal, or to overpay for one.
| Input | Value |
|---|---|
| Homes with access over the strip | 120 |
| Residual land value per plot, with access | 80,000 |
| Homes possible without the strip (existing lane, highways limit) | 30 |
| Residual land value per plot, without the strip | 70,000 |
| Share of the uplift (Stokes starting point) | 33.3% |
| Alternative route: buy and demolish an adjoining house | 850,000 |
| Alternative route: road and service works | 600,000 |
| Alternative route: plots lost to the new road | 4 |
| Existing use value of the strip | 15,000 |
The residual land values come from the scheme appraisals; the method is in how to calculate residual land value. The per-plot value without the strip is lower because a 30-home scheme carries a similar share of fixed costs over fewer units.
With access: 120 × 80,000 = 9,600,000. Without: 30 × 70,000 = 2,100,000.
Uplift = 9,600,000 − 2,100,000 = 7,500,000.
One-third: 7,500,000 ÷ 3 = 2,500,000, or 20,833 a plot.
House 850,000 + works 600,000 + 4 lost plots × 80,000 (320,000) = 1,770,000.
Ceiling = MIN(share of uplift, cost of the alternative) = MIN(2,500,000, 1,770,000) = 1,770,000.
Excel: =MIN((120*80000-30*70000)/3, 850000+600000+4*80000)
The strip owner's bargaining power is only as good as the developer's next best option. Here the second route costs 23.6 per cent of the uplift, less than the one-third share, so it caps the price at 1,770,000, which is 18.4 per cent of the land value with access and 118 times the strip's existing use value. The main site is worth 7,830,000 to the developer after paying for access, against 7,100,000 if the strip owner held out for a full third.
The negotiation range is therefore 15,000, the strip's value to its owner without the deal, to 1,770,000. Where the deal lands inside it depends on time, information and who needs the transaction more. A developer with a tight planning permission timetable will pay closer to the ceiling.
Why one-third? Stokes v Cambridge Corporation was a compulsory purchase compensation case. The claimant's land could only be developed with access over land it did not own, and the Lands Tribunal deducted one-third of the development value that access would release, as the sum a buyer of the land would have had to pay the access owner. The fraction was the Tribunal's judgement on the facts of that case, not a formula, and later decisions and settlements have used other shares. It has become the reference point in negotiations, not a rule: the share in a real deal reflects how many alternatives exist, how much of the scheme depends on the strip, and how quickly the developer needs it.
| Cost of alternative access | Share 25% | Share 33.3% | Share 50% |
|---|---|---|---|
| 1,200,000 | 1,200,000 | 1,200,000 | 1,200,000 |
| 1,770,000 | 1,770,000 | 1,770,000 | 1,770,000 |
| 2,500,000 | 1,875,000 | 2,500,000 | 2,500,000 |
| 3,500,000 | 1,875,000 | 2,500,000 | 3,500,000 |
Where a credible alternative exists, it binds and the share argument hardly matters. Only when the alternative is expensive, or there is none, does the percentage become the negotiation. If the site had no access at all without the strip, the uplift would be the full 9,600,000 and one-third would be 3,200,000, but the 1,770,000 route would still cap it.
Strip owners are often paid per plot as homes are sold, which suits the developer's cash flow. Paying the 14,750 per plot at 30 plots a year over four years has a present value of 1,498,841 at 7 per cent, 84.7 per cent of the up-front figure. To give the owner the same present value as 1,770,000 today, the per-plot price must rise to 17,418. That staged structure works like an overage, and the mechanics are the same as in how an overage payment is calculated.
Value the uplift, take a share as the opening position, and cap it with the cost of the best alternative. On this site that is 1,770,000, and every pound above it is a gift. The appraisal and land diligence workbooks for this kind of decision are on the free companion page for this book.
A 1961 Lands Tribunal compulsory purchase case in which the land being valued needed access over another owner's land, and the Tribunal deducted one-third of the development value that access released as the price of the access. It was a judgement on the facts, now the usual opening position for a ransom strip, not a fixed rule. On an illustrative uplift of 7,500,000 it gives 2,500,000, but the cost of an alternative access, here 1,770,000, will cap what a rational developer pays.
Cost a credible alternative and put it on the table: another access point, a different layout, or buying a neighbouring property. In the example buying and demolishing a house, building the road and losing 4 plots costs 1,770,000 in total, which cuts the price from 2,500,000 to at most 1,770,000. Finding the strip before agreeing the land price matters as much.
Yes, and it often is, as homes are sold. Per-plot payments defer cost but need a higher price to be worth the same: 14,750 a plot at 30 plots a year over four years is worth 1,498,841 today at 7 per cent, so matching 1,770,000 up front needs 17,418 a plot.
This article is one calculation from The Real Estate Development Manager. The book takes the same case from first principles to the decision, chapter by chapter, and every figure it prints is a live formula in the free companion workbooks.
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