How Do You Appraise a Development Site from a Brochure or Listing?
A first-pass workflow for turning an agent brochure or property listing into a source-backed development appraisal without treating marketing assumptions as confirmed facts.
7 min read
To appraise a development site from a brochure or listing, treat the brochure as the starting point, not the evidence base. Extract the site identity, boundary, area, asking price, planning status and proposed scheme, then verify the material facts against primary sources before building the first-pass values, costs, programme, finance and residual land value. The output should show both the answer and the assumptions that still need checking.
How This Works
An agent brochure or online listing is often enough to decide whether a site deserves an initial appraisal. It is rarely enough to support the final conclusion by itself.
A good first-pass workflow moves through five layers.
1. Capture The Site
Start with the information supplied:
address or site name
site area
boundary plan if available
asking price or guide price
planning status
proposed development quantum
tenure or use mix
agent commentary
supporting plans or technical documents
Keep the original document attached to the site record so the team can see exactly what was claimed.
2. Verify The Planning And Site Position
Check the local planning authority, planning history, development plan position, relevant policy, major constraints and any material evidence that affects development quantum, value or cost.
Where ownership, title or legal control matters to the decision, use the appropriate source and professional review rather than relying on marketing copy.
3. Build A Working Development Schedule
A brochure may say “potential for 70 homes”. Treat that as an input to test, not a confirmed scheme.
The team should review gross and net developable area, unit count, mix, tenure, floorspace and any obvious infrastructure or constraint that may change the working schedule.
4. Build The First Financial Case
Estimate or evidence the main appraisal inputs:
private GDV
affordable value where relevant
build cost
external works and infrastructure
abnormal allowances
professional fees
contingency
Section 106
CIL
programme
finance
target developer return
Then solve for the output needed by the team, such as profit at the asking price or residual land value before agreeing a price.
5. Record What Is Still Unknown
An early appraisal should not disguise uncertainty.
For each material assumption, record whether it is confirmed, evidenced estimate or assumption, along with the source and date. Then prioritise the missing evidence capable of changing the decision.
Worked Example
Imagine an agent sends a brochure for a 4.2-acre residential opportunity with a £3.5 million guide price and the phrase “potential for circa 70 homes, subject to planning”.
A weak first appraisal simply divides the asking price by 70 units and starts building a model around the brochure wording.
A stronger first pass asks:
Is 70 homes plausible once the boundary and net developable area are reviewed?
What is the current planning and allocation position?
What affordable housing assumption should be used?
Does CIL apply?
What Section 106 and infrastructure allowances are reasonable at this stage?
What are the best available comparable new-build values?
Are there obvious abnormal or access costs?
What programme and finance assumptions are being used?
What residual land value does the scheme support?
Suppose the first evidence review suggests a lower net developable area than the brochure implies and identifies a material infrastructure allowance that was not mentioned in the marketing pack.
That does not make the brochure “wrong”. It changes the assumptions that the land team needs to test before deciding whether £3.5 million works.
The first-pass output should therefore be a decision pack, not a false final valuation: current scheme assumption, current evidence, residual or profit result, sensitivities, missing information and next action.
Review Method
Before a brochure-led appraisal is relied on, check seven things.
Site identity and boundary
Make sure the appraisal is actually modelling the land being offered.
Development quantum
Separate the vendor or agent proposition from the team’s own working assumption.
Planning evidence
Check the current policy, planning history and constraints that could change the scheme.
Values
Use relevant evidence and record the adjustments made.
Costs and obligations
Separate evidenced costs, benchmark allowances and assumptions.
Programme and finance
Check that timing is consistent with the development and sales assumptions.
Decision and missing evidence
State what the team should do next and what evidence could reverse that view.
Sources Used
Relevant local planning authority development-plan, planning-history and evidence sources for the particular site
Limitations And Professional Review
A marketing brochure is not a substitute for planning, legal, valuation, cost, engineering or technical due diligence.
The first appraisal may be deliberately incomplete because the purpose is to decide whether further work is justified. That is acceptable when the gaps are visible and the team understands which assumptions drive the result.
Where a formal valuation, planning conclusion, title opinion, cost plan or other professional judgement is required, use the appropriate qualified advice.
Where Harold Viability Fits
Harold Viability is designed for this exact handoff from incoming opportunity to first reviewable appraisal.
A team can start from a listing, brochure, plan or address, review the extracted site information, planning evidence and comparables, then test the development schedule, costs, GDV, finance, residual land value, cash flow and sensitivity in the same workflow.
The aim is not to accept the brochure faster. It is to get from “this site has arrived” to “we know what needs to be true for it to work” without rebuilding the same information across separate tabs and spreadsheets.
Get your site appraised with Harold Viability.
For the wider land workflow, see Harold Land.
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