If you've spent any time around a development appraisal, you'll have seen GDV sitting at the top of the page, above every other number.
Gross development value in property is the estimated market value of a completed scheme once it's built and sold or let, and it's the single most important figure in a viability assessment. Get GDV in property wrong, and every number that follows it, from the price you can pay for the land to how much a lender will advance, is wrong too.
This guide covers what GDV means, how to calculate it for residential, commercial and mixed-use schemes, and where it sits in the wider appraisal.
Key Highlights
- GDV is the estimated value of a completed development once sold or let, not the value of the site today
- The residential calculation is straightforward: units × expected sale price
- Commercial and Build to Rent schemes use annual income ÷ exit yield instead
- GDV drives residual land value, the calculation that tells you what you can afford to pay for a site
- Lenders size loans against Loan to GDV (LTGDV), so an inflated GDV inflates what you think you can borrow
- Overestimated GDV is the classic appraisal failure, and the first thing a lender or comparables check will catch
- The LandTech Appraisal Tool builds GDV into a full residual appraisal, with comparables pulled straight from LandInsight
What is GDV in Property Development?
GDV, or gross development value, is the total value of a scheme once it's finished: every unit sold at its expected price, or every unit let and valued on its income, added together. It's an estimate made before construction starts, based on what similar completed schemes are achieving in the market today.
It's worth being clear about what GDV is not. It isn't the value of the site in its current, undeveloped state; that's a separate figure, arrived at by working backwards from GDV through the residual method (more on that below). And it isn't profit. GDV is a gross, top-line figure, calculated before any costs, whether that's construction, fees, finance or the developer's own margin, are taken off. Confusing GDV with profit, or with land value, is one of the more common mix-ups in early-stage appraisals, and it's an easy one to make given how often the term gets used loosely.
How to Calculate GDV
The method changes depending on what you're building and how it will be sold or let, but the underlying logic stays the same: what will this be worth once it's finished?
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Residential schemes use the simplest version of the calculation: the number of units multiplied by their expected sale price. A scheme of 10 units, each expected to achieve £300,000, gives a GDV of £3,000,000. In practice you'd build this up unit by unit rather than using a single average, since a three-bed house and a one-bed flat in the same scheme won't sell for the same figure, but the principle holds across the whole development.
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Commercial and Build to Rent (BTR) schemes are valued differently, because the return comes from income rather than a one-off sale. Here, GDV is calculated as annual net income divided by the exit yield: what an investor would pay, expressed as a percentage return, to buy the completed, income-producing asset. A BTR scheme generating £600,000 in net annual rental income, valued at a 5% exit yield, has a GDV of £12,000,000 (£600,000 ÷ 0.05). Get the yield wrong by even half a percentage point and the GDV swings by hundreds of thousands of pounds, which is why it's worth reading up on how exit yields are set and used before relying on a single assumed figure.
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Mixed-use schemes are simply the sum of the parts: calculate the GDV of the residential element and the GDV of the commercial element separately, using their respective methods, then add them together for the total scheme GDV. It's worth running a per-square-foot sanity check against local comparables once you've built the figure up, and working from gross internal area (GIA) rather than gross external area, since basing sale values on the wrong floor area measurement is a quick way to overstate the whole scheme.
What GDV Property Development Figures Are Used For
GDV isn't just a headline number. It's the input that three other, arguably more consequential, calculations depend on.
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Residual land value. This is where GDV earns its place at the top of the appraisal. Take GDV, subtract build costs, professional fees, planning obligations, finance costs and required developer profit, and what's left is the residual land value, the maximum you can afford to pay for the site and still hit your target return. Our guide to valuing development land walks through the full residual calculation with a worked example, but the short version is that every input in that formula is downstream of GDV. Overstate it, and you'll overpay for land before you've laid a single brick.
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Profit metrics. Developers typically express profit two ways: profit on GDV (profit as a percentage of the finished scheme's value) and profit on cost (profit as a percentage of what it cost to build). Both are useful, and lenders and investors will usually want to see both, but they can tell slightly different stories on the same scheme. For most residential development, a developer profit margin in the region of 15–20% of GDV is typical, though this shifts with risk appetite, funding structure and how confident the market is feeling.
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Funding. Lenders don't just cap borrowing against build cost. They also cap it against Loan to GDV (LTGDV), the loan expressed as a percentage of the finished scheme's value, and whichever cap, LTC or LTGDV, produces the lower figure is the one that governs. Our guide to development finance, lenders and rates covers how LTGDV interacts with loan to cost in more detail, but the practical upshot is this: an optimistic GDV doesn't just risk an overpriced site, it risks an application that looks fundable on your own spreadsheet and isn't on the lender's.
Getting Your GDV Right
An overestimated GDV is, by some distance, the most common failure point in a development appraisal, and it's usually the first thing a lender, a comparables check or a more experienced eye will pick up on. A few habits keep it in check.
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Lean on comparables discipline. Use recent, local, like-for-like sales rather than the strongest comparable you can find, particularly in a market that's moving quickly. A comparable from eighteen months ago, or from a slightly different part of town, needs adjusting before it earns a place in your GDV assumption, not dropping straight in.
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Stress-test it. Run the appraisal again with GDV 5–10% lower and see what happens to profit and, in turn, to the land price you can support. If a modest GDV movement wipes out your margin, that's worth knowing before you commit to a site, not after.
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Ground it in real data. LandInsight surfaces comparable sales alongside planning and ownership data, so your GDV assumption is built on what's actually happened nearby rather than a rule of thumb. And once you've got a figure you trust, the Appraisal Tool lets you flex it across scenarios in minutes rather than rebuilding a spreadsheet each time, which is also where our guide to building a lender-ready appraisal picks up, once your numbers are solid enough to present.
Ground your GDV in real comparables and stress-test it before you commit. Try the Appraisal Tool to build the full picture.
FAQs
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What does GDV mean in property?
GDV stands for gross development value: the estimated value of a completed scheme once it's built and sold or let, calculated before any development costs are deducted.
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Is GDV the same as profit?
No. GDV is the top-line, gross figure. Profit is what's left once build costs, fees, planning obligations, finance costs and land price have all been deducted from it.
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How do lenders use GDV?
Lenders cap borrowing against Loan to GDV (LTGDV), the loan expressed as a percentage of the finished scheme's value, alongside Loan to Cost (LTC). Whichever cap produces the lower figure sets the limit on what you can borrow.
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What is a good profit on GDV?
For residential schemes, a developer profit margin of around 15–20% of GDV is typical, though the figure moves with risk appetite, scheme type and how the deal is funded.
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What is the difference between GDV and NDV?
GDV is the gross figure before disposal costs. Net development value (NDV) deducts the costs of selling the completed scheme, such as agents' fees, marketing and legal costs, giving a more accurate picture of what a developer actually nets from the sale.
GDV is the Number Everything Else Depends On
Get GDV right, and the land price, the profit and the funding all follow from it. Get it wrong, and every number downstream inherits the mistake. Appraise your next scheme with LandTech: explore the Appraisal Tool or book a demo to see how comparables, planning data and appraisal build straight into one workflow.
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