Appraisal & Viability 08 min read

What Is Residual Land Value?

Residual land value is the value of a development site calculated by working backwards from what the completed scheme is worth. It is the most a developer or housing association can pay for the land while still covering all costs and achieving the required return.

It is one of the most important figures in residential development. It shows what price a site can justify, and it is the basis of site-specific viability evidence in planning. For housing associations, the same appraisal that produces it also shows how large a funding gap a scheme has, which is what grant applications must evidence. SDS makes ProVal Vantage, and we refer to it where it illustrates a point.

SDS · Updated October 2026

How residual land value is calculated

The residual method starts with gross development value (GDV), the total value of the completed scheme, and deducts everything needed to create it. What remains is the value available for land.

In simplified form:

Residual land value = GDV − (construction costs + professional fees + statutory and planning costs + finance costs + developer's return)

In practice it is more complex. A mixed-tenure scheme combines different valuation bases: open market homes are valued on comparable sales, rented homes on the present value of future net rental income, and shared ownership homes on the initial equity sale, rent on unsold equity and future staircasing receipts (National Housing Federation, Understanding Development Appraisal, 2015). Each tenure has its own costs and income profile.

Housing associations often reach residual land value from the other direction. Their appraisals typically measure the net present value (NPV) of long-term net rents against cost, and the residual land value for a rented scheme is the land price at which that NPV falls to zero.

ProVal appraises multiple tenures in a single appraisal and reports NPV, IRR and payback.

Existing use value and benchmark land value

Two related concepts sit alongside residual land value in planning viability.

Existing use value (EUV) is the value of the land in its current use, such as farmland, a redundant industrial building or a car park. Planning practice guidance states that EUV is not the price paid for the land and should disregard hope value (Planning Practice Guidance: Viability).

Benchmark land value (BLV) is EUV plus a premium for the landowner, an approach often called EUV+. The guidance describes the premium as the minimum return at which a reasonable landowner would be willing to sell. It is not a share of the uplift from planning permission, and it should allow for the cost of complying with policy. The premium should be informed by market evidence and can draw on benchmark land values from other viability assessments. Setting it still involves professional judgement and is often contested.

In a site-specific viability assessment, a scheme whose residual land value is at or above the benchmark is treated as viable at the proposed level of planning contributions. One that falls below is not viable on that basis.

Residual land value and planning viability

Under the National Planning Policy Framework (August 2026), viability is tested mainly when local plans are prepared. Plans should set affordable housing requirements at a level that keeps planned development deliverable, express them as a single figure, and make them clear enough to be reflected in the price paid for land. Development that complies with up-to-date plan policies is assumed to be viable (NPPF, policies PM12 and DM5).

A site-specific viability assessment may be justified only in particular circumstances: a development materially different from those the plan tested, site characteristics materially different from those assumed, costs the plan's evidence did not account for, or a significant change in economic circumstances such as a recession. Where an assessment is submitted, it must refer back to the plan's viability evidence, fully evidence and explain its inputs, follow the approach in planning practice guidance including its standardised inputs, and be made publicly available. The price paid for land is not a justification for failing to meet plan policies, and the weight given to the assessment is for the decision-maker (NPPF, policy DM5). Plans should also set out when review mechanisms will apply where contributions are reduced.

In that setting, a residual land value calculation is credible when its assumptions are transparent, evidenced and consistent with the plan's viability evidence, because the assessment will be published and scrutinised by the authority and its advisers.

Residual land value and Homes England grant

For housing associations applying for grant under Homes England's Social and Affordable Homes Programme (SAHP) 2026 to 2036, the question is whether, and by how much, a scheme needs grant to be viable. Homes England's Capital Funding Guide sets out how this is assessed (Capital Funding Guide, chapter 6):

Applicants provide expected costs, income, any profit and other public funding for each scheme.
Homes England identifies the viability gap by comparing total costs with the applicant's maximised financial contributions, including loan debt. Grant is the minimum amount needed to achieve a viable, deliverable and affordable scheme, the balancing sum after all other contributions have been stretched as far as the applicant's business plan allows.
Value for money is assessed mainly on grant per home, benchmarked against regional and scheme-type averages, alongside strategic fit and deliverability.
Where a development has mixed tenures, each tenure's scheme is entered and assessed separately, and each must stand alone with no cross-subsidy assumed, even on the same site.
SAHP funding cannot be used to acquire homes secured through Section 106 agreements.

Residual land value itself is not Homes England's test, but the appraisal behind it is. The same model should show the scheme's position with and without grant, so the viability gap, and the grant requested, are evidenced and kept to a minimum. ProVal has grant and subsidy assumptions built in and lets teams test how different funding scenarios and grant rates affect viability.

Common pitfalls

Several recurring mistakes weaken residual land value calculations:

Using the price paid as the benchmark. Planning guidance excludes the price paid from benchmark land value, and the NPPF states it cannot justify failing to meet policy.
Including hope value in EUV. EUV should reflect the current use only.
Inconsistent assumptions across schemes. Different build cost benchmarks, finance rates or treatment of grant make schemes impossible to compare at portfolio level and create risk when appraisals are reviewed externally.
Cross-subsidy in grant bids. Homes England assesses each tenure separately with no cross-subsidy assumed, so an appraisal that relies on it will not match the funding assessment.
Unevidenced inputs. A site-specific assessment must fully evidence its inputs and will be published, so undocumented assumptions are a weakness.

Purpose-built appraisal software helps with consistency. Proval lets administrators set development assumptions and defaults centrally, so every scheme starts from the same basis. Proval stores appraisals centrally, with assumptions, defaults and overrides held in one place, so the basis of each residual land value can be traced.