8 Things a Development Appraisal Should Include (and Why Lenders Check Them)

Before a bank will fund a scheme, or a landowner will agree a price, someone has to show that the numbers work. A development appraisal does exactly that: it tests whether a proposed project can cover its costs, meet planning obligations, deliver a suitable return and still leave a credible residual land value.

Most UK appraisals use the residual method. In simple terms, you estimate what the completed scheme will be worth, subtract everything it will cost to get there (including finance and a profit allowance), and what remains is the residual value of the land — the core output of a full residual development appraisal. Lenders scrutinise every line because small assumptions can flip a scheme from bankable to unviable. Here are eight things a robust appraisal should include — and why those checks matter.

1. Gross development value (GDV) grounded in evidence

GDV is the estimated value of the completed development on the open market. For sale schemes that usually means unit-by-unit values based on comparable evidence; for investment schemes it may mean capitalising expected rents. Mixed-use projects need each element valued on the right basis, with voids, incentives and purchaser costs handled transparently.

Lenders care because GDV sits at the top of the residual equation. Optimistic sales rates, weak comps or ignoring soft market conditions inflate the residual and overstate how much debt the site can safely support. A proper appraisal cites recent, relevant comparables, states the valuation date and explains any adjustments — the same discipline you would expect in a wider commercial property valuation.

2. Build costs with a realistic contingency

Construction cost is rarely a single contractor quote. A complete appraisal breaks out demolition, enabling works, infrastructure, main build, external works, abnormal items (contamination, poor ground, flood mitigation) and a contingency for cost overrun. Cost plans from a quantity surveyor or cost consultant carry more weight than headline £/sq ft rules of thumb, though benchmarks still help cross-check.

Lenders look hard at contingency and abnormals because underestimating either is a common cause of mid-scheme funding shortfalls. Contingency often sits in a typical 5–10% range of build cost depending on design stage and risk, but the right figure is scheme-specific. If the appraisal is thin on abnormals for a brownfield site in London or Manchester, expect challenge.

3. Professional fees and other soft costs

Architects, engineers, planning consultants, project managers, legal fees, surveys, marketing and agency fees all erode GDV before any land value appears. Fee allowances are often expressed as a percentage of construction cost or GDV, but they should still be itemised so nothing material is missed.

From a lender’s perspective, omitted soft costs are silent overstatement of residual value. Clear fee lines also show that the developer has thought through the consultant team the project actually needs — which is part of judging execution risk, not just arithmetic.

4. Finance costs and funding structure

Interest on land and construction finance, arrangement fees, exit fees and the timing of drawdowns all belong in the appraisal. A simple interest percentage applied to total cost can understate true finance if cashflow timing is ignored. Phased schemes and longer programmes amplify this.

Lenders check finance assumptions against their own terms and against market rates. They also want to see how much equity sits alongside debt, because gearing drives both interest cost and downside exposure. An appraisal that assumes unrealistically cheap or endless finance will not survive credit committee.

5. Developer’s profit (return for risk)

Profit is not an optional extra; it is the return required for taking development risk. It is commonly expressed as a percentage of GDV or of total cost. Typical cited ranges often sit around 15–20% of GDV for many private residential or mixed-use schemes, with higher requirements for riskier or more complex projects and sometimes lower for simpler, pre-sold or lower-risk work — but there is no single “correct” rate.

Lenders test whether the profit margin is adequate for the risks they are underwriting. Squeeze profit to inflate land value and the scheme becomes fragile: a modest cost rise or sales slip can wipe out the buffer. Conversely, an inflated profit on a low-risk build-to-rent or pre-let commercial scheme may simply mean the land bid is uncompetitive.

6. Residual land value and benchmark land value

After GDV, costs, finance and profit, the residual method produces a residual land value — what a rational developer could pay for the site. That figure should be sense-checked against market evidence for comparable land, and against existing use value where relevant.

In planning viability work, residual results are often compared with benchmark land value (BLV), typically based on existing use value plus a premium, rather than treating an aspirational asking price as a fixed cost. Lenders and valuers alike push back when an appraisal “solves” for an unrealistic land price by compressing profit or ignoring policy costs. Getting this right is central to any serious development appraisal in London or other high-value markets where land expectations run hot.

7. Planning obligations: Section 106 and CIL

Section 106 contributions, Community Infrastructure Levy (CIL), affordable housing requirements and other policy costs can be material. An appraisal should reflect the adopted local plan position, any site-specific heads of terms and how affordable units are valued (for example transfer values to a registered provider rather than open-market GDV).

Lenders check these lines because planning risk converts directly into cash. Understating affordable housing or CIL flatters residual value; overstating without evidence can kill a deal that would otherwise work after negotiation. Policy inputs should be dated and sourced, and sensitivity to alternative planning scenarios is often wise.

8. Programme, cashflow and sensitivity analysis

A static residual snapshot is not enough for funding. Lenders want a timeline: planning lead-in, construction period, sales or letting curve, and when revenue actually arrives. Cashflow drives peak debt, interest and whether the scheme can service itself through the build.

Sensitivity (and sometimes scenario) analysis then stress-tests the critical variables — GDV, build cost, programme delay, interest rates and sales rates. Showing what happens if values fall 5–10% or costs rise by a similar margin is often more persuasive than a single “base case” spreadsheet. Exit assumptions should also be clear: sale of completed assets, refinance, or hold as an investment, with exit values supported by comparables rather than hope.

How lenders use the appraisal alongside formal valuation

A development appraisal informs viability and land pricing; a bank may still instruct a formal valuation for lending purposes. Where that valuation is required to RICS Red Book standards, the valuer’s report and the appraisal should tell a consistent story on GDV, costs and risk — see our guide to Red Book valuation for how lender valuations are framed.

Location still matters. Build costs, sales evidence, CIL rates and affordable housing policy vary sharply between markets, so inputs that work for a development appraisal in Manchester will not simply copy across to another city without fresh evidence.

Frequently asked questions

Is a development appraisal the same as a Red Book valuation?

Not necessarily. An appraisal is a viability and residual pricing tool. A Red Book valuation is a formal opinion of value prepared to RICS Valuation – Global Standards for a stated purpose (often secured lending). They often draw on similar evidence, but they are not automatically the same product.

Who typically prepares the figures?

A valuation surveyor usually leads the residual appraisal and GDV evidence, often working with a cost consultant, planning adviser and the developer’s own team. Lenders may also run their own in-house or panel checks.

When should you commission one?

Before buying land, submitting a viability case, raising development finance, or renegotiating planning obligations. Early, evidence-based numbers save more than they cost when a scheme is marginal.

Next steps

If you are acquiring a site, refinancing a scheme or need a lender-ready view of viability, start with a clear brief: use mix, planning status, cost information and target programme. You can request a quote for a professional scheme viability appraisal through UK Valuation Surveyors and compare options for your location and scheme type.