GDV (Gross Development Value) is the total open-market value of a completed development at the point all units are sold or let. Profit on cost is calculated as GDV minus total project costs, divided by total project costs, expressed as a percentage. Development finance lenders require a minimum profit on cost of 20%. A scheme with a GDV of £2,000,000 and total costs of £1,600,000 generates a 25% profit on cost and a 20% profit on GDV.
Last updated: 19 May 2026
What Is GDV and How Is Profit on Cost Calculated in Property Development?- What Is GDV and How Is It Determined?
- What We See in Practice: GDV Assumptions That Make or Break Development Finance
- How Is Profit on Cost Calculated in a Development Appraisal?
- What Is Profit on GDV and How Does It Differ from Profit on Cost?
- What Costs Are Included in a Development Appraisal?
- How Do Development Finance Lenders Use GDV and Profit on Cost?
- What Is the Development Finance Stress Test on GDV?
- How Does GDV Affect the Capital Stack in Property Development?
- Frequently Asked Questions: GDV and Profit on Cost
What Is GDV and How Is It Determined?
GDV (Gross Development Value) is the aggregate open-market value of all units or lettable areas within a completed development project, assessed as if the development were complete and all units sold or let at the date of valuation. It is determined by an independent RICS Red Book valuation, not by the developer's agent's estimates, and it is the single most important number in any development appraisal because all lender leverage calculations and viability assessments are expressed as a percentage of GDV.
The RICS valuer determines GDV by analysing comparable transactions: recent sales of equivalent properties in the same locality, adjusted for size, specification, location quality, and market conditions. For a scheme of 10 two-bedroom flats in a specific postcode, the valuer will identify recent sales of two-bedroom flats in that area, apply adjustments for any differences in specification or floor level, and arrive at an assessed market value per unit. The total GDV is the sum of the assessed values across all units in the scheme.
GDV is expressed as a range in most RICS valuations: a lower end, a midpoint, and an upper end reflecting the range of comparable evidence and market conditions. Lenders assess development finance on the lower or midpoint GDV figure, not the upper end. Developers who build their appraisals on the upper GDV estimate and approach lenders expecting lending against the optimistic figure consistently encounter a funding gap at credit stage.
- GDV is the aggregate open-market value of completed units at the date of appraisal
- Determined by: independent RICS Red Book valuation, not developer's agent estimate
- Basis: comparable residential sales adjusted for unit size, specification, and location
- Lender approach: base case on lower or midpoint RICS GDV estimate
- When to commission: before approaching any lender; during planning stage for scheme viability testing
What We See in Practice: GDV Assumptions That Make or Break Development Finance
In development appraisal work as part of CFO advisory to a £205m property and care group, the GDV assumption is the variable I challenge most consistently. The gap between an optimistic agent-advised GDV and a conservative RICS valuation is the single most common reason development finance applications fail to achieve the leverage the developer anticipated.
I see three specific GDV errors repeatedly. First, using a headline per-square-foot rate from a high-end comparable without adjusting for the subject scheme's specification. A developer building to a mid-market specification in a mixed-quality area should not use the GDV rate from a newly completed luxury scheme 200 metres away. The RICS valuer will not use it, and the 10 to 15% GDV gap that results shifts the entire capital stack.
Second, including in GDV any commercial units at optimistic lease terms before those terms have been agreed. Commercial GDV is far more speculative than residential GDV for most development schemes: it depends on demand from occupiers who have not yet been found, at rents that are estimated, not contracted. I exclude uncommitted commercial GDV entirely from base-case development appraisals and treat it as upside that improves the return but does not affect the viability assessment.
Third, failing to account for sales costs in the GDV to net proceeds calculation. Developers sometimes treat GDV and net development proceeds as equivalent. Agent fees of 1.5 to 2.5% on residential sales, legal fees of £1,000 to £2,500 per unit, and marketing costs of £500 to £2,000 per unit on larger schemes all reduce the actual cash received from sales. These are project costs that reduce profit on cost even if they are not build costs. A scheme with £2,000,000 GDV and 2% agent fees plus £15,000 in legal and marketing costs nets £1,950,000, and the appraisal should use this net figure.
The practical discipline I apply is a three-scenario GDV model: base case using conservative RICS comparables, a 10% downside to simulate a market correction, and a 10% upside for scheme optimisation. The scheme must show 20% profit on cost at the base case to be viable, and must remain above zero profit at the 10% downside. If a 10% GDV reduction makes the scheme loss-making, it is too dependent on optimistic pricing assumptions to proceed with debt financing.
How Is Profit on Cost Calculated in a Development Appraisal?
Profit on cost is calculated by subtracting total project costs from GDV, then dividing the result by total project costs, and expressing it as a percentage. The formula is: (GDV minus Total Costs) divided by Total Costs, multiplied by 100. A scheme with GDV of £2,000,000 and total costs of £1,600,000 generates a surplus of £400,000. Dividing £400,000 by £1,600,000 gives 0.25, or 25% profit on cost.
Total project costs for the profit on cost calculation must include all costs, not just build costs. The full cost schedule includes: land acquisition cost (net of any costs already incurred), SDLT on land purchase, legal fees for acquisition, main contractor build contract sum, site preliminaries, professional fees (architect, structural engineer, planning consultant, quantity surveyor), planning and building regulations fees, development finance interest (rolled up during the build period), arrangement fees and exit fees on the development finance facility, monitoring surveyor fees, marketing and sales costs, and a contingency allowance, typically 5 to 10% of build cost for well-specified schemes and 10 to 15% for conversions or projects with significant unknowns.
Developers who exclude finance costs from the profit on cost calculation overstate their margin materially. A scheme that generates 25% profit on cost before financing costs but only 15% when rolled-up development finance interest at 9% per annum over 18 months (approximately 13.5% of the drawn balance) is included, falls below the 20% lender requirement and is not viably financed at that leverage. Including all costs accurately is essential for any appraisal that will be presented to a development finance lender.
What Is Profit on GDV and How Does It Differ from Profit on Cost?
Profit on GDV expresses the development surplus as a percentage of GDV rather than as a percentage of total costs. The formula is: (GDV minus Total Costs) divided by GDV, multiplied by 100. It is a complementary metric to profit on cost, giving a different perspective on the same surplus. Lenders require profit on GDV of at least 15%, which corresponds broadly to a 17.6% profit on cost.
The arithmetic relationship between the two metrics is fixed: a 20% profit on cost equals 16.7% profit on GDV, and a 25% profit on cost equals 20% profit on GDV. The conversion formula is: profit on GDV equals profit on cost divided by (1 plus profit on cost as a decimal). For a 20% profit on cost: 0.20 divided by 1.20 equals 16.67% profit on GDV.
Profit on GDV is a better benchmark for comparing schemes of different sizes because it is less sensitive to the ratio of costs to GDV. A land-rich scheme with low build costs shows a high profit on cost but a more moderate profit on GDV. A build-heavy scheme with minimal land cost shows the opposite pattern. Professional developers and their lenders typically report both metrics in every development appraisal. The convention in the UK development market is to lead with profit on cost, supplemented by profit on GDV as a cross-check. For more on development finance structures, see our guide to development finance for UK property developers.
- Profit on GDV formula: (GDV minus Total Costs) divided by GDV x 100
- Lender minimum: 15% profit on GDV is the standard threshold
- 20% profit on cost equals 16.7% profit on GDV
- 25% profit on cost equals 20% profit on GDV
- Report both metrics in every lender-facing development appraisal
What Costs Are Included in a Development Appraisal?
A complete development appraisal includes every cost associated with the project from site acquisition to the point at which the development finance facility is repaid. Missing or underestimating costs is the most common source of profit on cost overstatement, and lenders check the cost schedule in detail during credit underwriting.
The cost schedule is organised in three sections. The land costs section includes the purchase price, SDLT on acquisition, legal fees for the purchase, and any environmental survey or planning application costs incurred before finance is drawn. The build costs section includes the main contractor contract sum or schedule of rates for self-build, site preliminaries (site manager, site welfare, plant and equipment), subcontractor packages if not included in the main contract, external works and landscaping, and the contingency allowance. The finance and professional costs section includes development finance interest, arrangement fees, exit fees, monitoring surveyor fees, architect and structural engineer fees, planning consultant fees if any, quantity surveyor fees, warranty and insurance costs (structural defect warranty, public liability, contract works), and sales and marketing costs.
- Land costs: purchase price, SDLT, legal fees, pre-planning surveys
- Build costs: main contract, preliminaries, subcontractors, external works, contingency
- Finance costs: interest, arrangement fee, exit fee, monitoring surveyor
- Professional fees: architect, structural engineer, planning consultant, QS
- Sales costs: agent fees 1.5 to 2.5%, legal fees £1,000 to £2,500 per unit, marketing
- Contingency: 5 to 10% of build cost for new build; 10 to 15% for conversions
How Do Development Finance Lenders Use GDV and Profit on Cost?
Development finance lenders use GDV and profit on cost as the primary screening metrics for scheme viability and leverage determination. The GDV determines the maximum facility size (at 65% of GDV for senior debt). The profit on cost determines whether the scheme is viable enough to fund: below 20% profit on cost is a decline or requires restructuring; above 20% is acceptable; above 25% is preferred and may attract better terms.
Lenders build their own development appraisal model independently of the developer's submission and compare the outputs. Where the lender's GDV is lower than the developer's, the facility size reduces accordingly. Where the lender's cost estimate is higher (based on their experience of build costs for comparable schemes in the area), profit on cost falls. A developer whose appraisal shows 22% profit on cost using optimistic assumptions may find the lender's model shows 16% on the same scheme, which is below the viability threshold.
The sensitivity analysis the lender applies to the appraisal is standard: GDV minus 10%, costs plus 10%, then check whether profit on cost remains above the minimum threshold. A scheme that shows 20% profit on cost at base case but falls to 5% under the combined stress scenario will be declined or will require additional equity or security before the lender will proceed. For more on property investment finance decisions, see our complete property finance guide.
What Is the Development Finance Stress Test on GDV?
The development finance stress test applies a downward adjustment to GDV and an upward adjustment to costs simultaneously, then recalculates profit on cost to assess whether the scheme remains viable under adverse market conditions. The standard stress test applies a 10 to 15% reduction to GDV and a 10% increase to build costs. Schemes that fall below the minimum profit on cost threshold under this stress scenario are considered too sensitive to market volatility for standard leverage.
The stress test is applied because development schemes are typically 12 to 24 months from start to practical completion. Over that period, the residential property market can move significantly in either direction, and build costs can increase due to material price inflation or contractor availability constraints. The stress test simulates a modest market correction combined with a build cost overrun, which are the two most common adverse scenarios in development finance.
A scheme with a base-case GDV of £3,000,000 and total costs of £2,250,000 shows a 33% profit on cost at base case. Under a 10% GDV stress (GDV reduced to £2,700,000) and a 10% cost increase (costs rise to £2,475,000), the stressed profit on cost is (£2,700,000 minus £2,475,000) divided by £2,475,000, giving 9.1%. This scheme fails the stress test dramatically and would be declined unless the capital structure is materially changed to reduce leverage and increase equity. A well-structured scheme should show at least 15% profit on cost under the combined stress scenario to be considered robustly viable.
How Does GDV Affect the Capital Stack in Property Development?
The capital stack in property development consists of equity at the bottom, senior development debt in the middle, and mezzanine finance in some cases between the two. GDV determines the maximum size of each layer. Senior debt sits at up to 65% of GDV. Mezzanine extends this to 70 to 80% of GDV. Equity funds the remaining 20 to 35% of GDV implied by the capital structure.
As GDV increases for a given cost base, the profit on cost improves and the equity requirement as a proportion of total project cost reduces. Conversely, if GDV is lower than expected, the senior debt facility shrinks, the equity requirement grows, and the developer must find additional capital or restructure the scheme. This sensitivity is why GDV accuracy matters so much: a 10% error in GDV assessment can change the equity requirement by 10 to 15 percentage points of total project cost, turning a manageable deal into one that cannot be funded.
The optimal capital stack maximises senior debt (cheapest capital) and minimises equity (most expensive capital) while maintaining the minimum profit on cost required by lenders and the developer's own return hurdle. Mezzanine finance sits between these two constraints: it is more expensive than senior debt but cheaper than equity in terms of the return it demands. For developers with multiple simultaneous schemes, mezzanine on each scheme allows more capital to be deployed across a wider portfolio than an equity-only approach would permit. Our CFO advisory service includes capital stack optimisation and development appraisal preparation for schemes at every stage.
Frequently Asked Questions: GDV and Profit on Cost
What is a good profit on cost for a UK property development?
A profit on cost above 20% is considered the minimum viable threshold by most development finance lenders. A profit on cost of 25% or above is considered comfortable for a scheme of modest complexity. Above 30% profit on cost typically indicates either a very strong land purchase, a below-market build cost, or an unusually high GDV relative to the local market, and warrants verification before relying on it for financing purposes.
What is the difference between GDV and NDV (Net Development Value)?
GDV is the total aggregate market value of all completed units without deducting sales costs or VAT. NDV (Net Development Value) deducts the expected sales costs, including agent fees, legal fees, and marketing, to show the net cash proceeds the developer will actually receive. Profit on cost should be calculated using NDV rather than GDV to produce an accurate margin figure. The difference between GDV and NDV is typically 3 to 5% of GDV on a standard residential scheme.
Can I use GDV to calculate how much development finance I can borrow?
Senior development finance is sized at up to 65% of the independently assessed GDV, subject to the 90% of build cost ceiling. Using the lower of these two constraints gives the maximum senior debt facility. If GDV is £2,000,000, maximum senior debt is £1,300,000 (65% of GDV), subject to the build cost constraint. You cannot use GDV alone without the build cost constraint check.
Does GDV include VAT?
No. GDV for residential developments is expressed exclusive of VAT because new residential dwellings are zero-rated for VAT purposes. The sale proceeds received by the developer are the gross residential sale prices, which are the comparable values used in the RICS valuation. Commercial developments involving taxable supplies require a different treatment, and VAT advice specific to the scheme is needed where any commercial element is included in GDV.
What happens if my GDV falls during the development?
If the independent RICS valuation of GDV falls materially during the build period (due to a market correction or changes in comparable evidence), the lender may invoke a covenant breach under the development finance facility and require additional equity to be injected to restore the loan-to-GDV ratio to the contracted level. This is called a loan-to-value retest. Development facility agreements typically include annual or trigger-event revaluation provisions. Developers should model this risk in their financial planning.
How is GDV calculated for a mixed-use development?
GDV for a mixed-use development is calculated separately for each element and then aggregated. Residential units are valued using comparable residential sales. Commercial units are valued using an investment yield approach: the estimated contracted rent divided by an appropriate yield, giving a capital value. For example, a commercial unit generating £25,000 per annum at a 7% yield has a capital value of £357,000. The residential and commercial GDV components are added together for the total scheme GDV.
GDV and profit on cost are the two metrics that determine whether a development scheme can be financed, at what leverage, and on what terms. A GDV based on conservative RICS comparable evidence, a cost schedule that includes all finance costs, professional fees, and sales costs, and a profit on cost of 20% or above at base case are the three non-negotiable conditions for accessing standard development finance. Below 20% profit on cost at base case, or below 10% profit on cost under the combined 10% GDV stress and 10% cost increase, the scheme is not viable at senior debt leverage. The discipline of building development appraisals from the conservative GDV down, not from an optimistic GDV up, is the single practice that most reliably separates successful development finance transactions from those that fail at credit stage.
For property finance structuring, SPV setup, or development finance modelling, speak to Bharat Varsani FCCA at Key Ledgers Global. Request a consultation at /contact/.
About the author: Bharat Varsani FCCA is a portfolio CFO and financial adviser with experience as CFO to a £205m property and care group, advising on SPV structures, development finance, SDLT planning and portfolio refinancing across the UK.
Sources: RICS Red Book valuation standards: rics.org. HMRC guidance on VAT and construction: gov.uk. UK Finance residential property market data: ukfinance.org.uk.