Development valuation and Red Book valuation are often treated as two different services, but they answer different questions. A development valuation considers what land or property may be worth because of its development potential, often using the residual method. A Red Book valuation is a valuation prepared to RICS professional standards. A development valuation can also be a Red Book valuation.
The important distinction is often between a development appraisal prepared to test a scheme and an independent formal valuation prepared for a defined purpose. Understanding that difference can help landowners, developers and advisers request the right report.
What is a Red Book valuation?
The RICS Valuation Global Standards, usually called the Red Book, are the professional standards that govern valuation work carried out by RICS members and RICS regulated firms. First published in 1976, the standards are updated regularly. The current edition became effective on 31 January 2025.
A Red Book valuation is not a valuation method or a particular type of property valuation. It is a formal report prepared to an agreed professional standard for a defined purpose.
A Red Book valuation will usually:
- Be prepared by a RICS Registered Valuer
- State the purpose of the valuation
- Confirm the basis of value
- Identify the valuation date
- Set out relevant assumptions and limitations
- Explain the information and evidence considered
- Describe the valuation approach and reasoning
- Be prepared for stated users who may rely on it
RICS standards require clear written terms of engagement and valuation reporting. The report must identify:
- The asset
- The purpose
- The valuation date
- The basis of value
- Investigations undertaken
- Information relied on
- Assumptions
- The valuation approach
Market Value is a common basis of value, but it is not the only basis. The suitable basis will depend on the instruction, such as secured lending, financial reporting, probate, taxation or a dispute.
Brian Gale Surveyors prepares RICS Red Book valuation reports for residential and commercial property. These reports are prepared by RICS Registered Valuers and define the purpose, basis of value, assumptions and limitations of the instruction.
What is a development valuation?
A development valuation considers the value of land or property by reference to its development potential. This may apply to a site with planning permission, a property suitable for conversion, a garden plot, an infill site or land with longer term potential.
Development property can range from a single residential plot to a larger mixed use or commercial scheme. These valuations can involve greater uncertainty than a standard property valuation because the result may depend on planning, build costs, sales values, programme assumptions and market demand. RICS notes that development property valuations can be complex and may have a high degree of variation.
The residual method is commonly used to assess development land value. In plain terms, it works backwards from the completed scheme:
Gross Development Value
minus total development costs
minus developer’s profit
equals residual land value
Gross Development Value, often shortened to GDV, is the anticipated value of the completed development. Costs may include construction, professional fees, finance, planning obligations, site works, marketing costs and sales costs. The developer’s profit reflects the return required for taking on the project’s risk.
The residual land value is not necessarily the price that will be agreed in a transaction. It is an indication of what a developer may be able to pay for the site after allowing for the assumptions used in the appraisal.
Comparable land sales may also be considered where suitable evidence is available. The appropriate approach will depend on the property, the planning position and the purpose of the valuation.
Brian Gale Surveyors provides development and land valuation advice for residential development sites, commercial development land, garden plots, infill sites, agricultural land and strategic land with potential for future development.
Development appraisal vs formal valuation, the distinction that actually matters
The most useful comparison is often not development valuation versus Red Book valuation. It is a development appraisal versus a formal Red Book valuation.
A development appraisal is commonly used as a decision tool. A developer, landowner or investor may use it to test whether a scheme appears viable, what purchase price may be possible or how a change in costs could affect the outcome.
The appraisal will depend on the assumptions used. These might include the proposed scheme, build cost, sales rate, finance costs, selling prices and target profit. Different developers may use different assumptions and seek different returns, so their appraisals can produce different figures for the same site.
A formal Red Book valuation provides an independent opinion for a defined purpose. It may be required where a lender, solicitor, accountant, HMRC, court or another party is expected to rely on the figure. The valuation must clearly explain its basis, assumptions, evidence and reasoning.
A Red Book valuation of development land may use residual analysis. It may also use comparable evidence or another appropriate method. The fact that residual analysis is used does not prevent the report from being Red Book compliant.
The difference is therefore one of purpose, independence and reporting standard. A private appraisal asks, “What can this particular scheme support?” A formal valuation asks, “What is the property worth for the defined purpose on the valuation date, based on an independent assessment of the available evidence?”
Which one do you need?
A development appraisal may be appropriate where you are privately considering whether to pursue a scheme or deciding the level of an offer. It can help test assumptions before a significant commitment is made.
A formal Red Book valuation may be required where a third party will rely on the opinion. This can include:
- Development finance or secured lending
- Refinancing
- Taxation matters
- Probate and estate matters
- Matrimonial or partnership matters
- Financial reporting
- Court proceedings or dispute resolution
- A commercial purchase or sale
The report needed will depend on the purpose of the instruction. A lender may have specific requirements. Tax, legal and accounting matters can also require a valuation at a particular date or on a specific basis of value.
A RICS Registered Valuer can advise on the suitable form of report. Legal, tax and accounting advice should be obtained separately where required.
Why the valuer and the standard matter
Development land decisions can involve significant financial commitments. A small change in sales values, construction costs, planning obligations or profit assumptions can have a material effect on a residual land value.
This does not mean one figure is automatically wrong. It means the assumptions, evidence and purpose of each exercise must be understood. A developer’s appraisal may be entirely appropriate for internal decision making, while a lender may require a formal independent valuation for a different purpose.
A valuation prepared to RICS Red Book standards provides a defined process for recording the valuation date, purpose, basis of value, assumptions, investigations and professional reasoning. RICS also requires the valuer to have the necessary skills, knowledge and competence for the instruction.
Brian Gale Surveyors is an independent Chartered Surveying practice based in Reigate. Established in 1985, the practice provides residential and commercial valuation advice across Surrey, Sussex, Kent, Hampshire, London and the wider South East. The practice is independent of estate agents and third parties.
Where a site is being sold subject to future development potential, an overage agreement may also be relevant. This is a separate legal arrangement that can depend on an independent valuation when a defined trigger event occurs.
For a closer look at how valuation evidence is assessed, read how surveyors calculate market value.
For the appropriate report for a site, development proposal or formal requirement, request a development valuation.
Brian Gale Surveyors provides independent valuation advice and does not provide legal or tax advice.
Frequently asked questions
- Is a development valuation the same as a Red Book valuation?
Not quite. A development valuation is a type of valuation that considers land or property in the context of its development potential. It will often use the residual method.
A Red Book valuation refers to the professional standards followed when preparing the report. A development valuation can be prepared as a Red Book valuation by a RICS Registered Valuer.
- What is a Red Book valuation?
A Red Book valuation is a formal valuation prepared in line with the RICS Valuation Global Standards. It is undertaken for a defined purpose and states the basis of value, valuation date, assumptions, limitations and reasoning.
It may be required for lending, taxation, probate, financial reporting or dispute matters where an independent report is needed.
- What is the residual method of development valuation?
The residual method starts with the anticipated value of the completed development, known as Gross Development Value. It then deducts the estimated costs of delivering the scheme and an allowance for developer’s profit.
The figure remaining is the residual land value. It can help assess what a developer may be able to pay for a site based on the assumptions adopted.
- When do I need a Red Book valuation for development land?
A Red Book valuation may be needed where a lender, solicitor, accountant, HMRC, court or another third party will rely on the figure. Common circumstances include development finance, refinancing, probate, taxation and disputes.
A private development appraisal may be sufficient where you are testing a proposal for internal decision making. The appropriate report will depend on the instruction.
- Can a development appraisal and a formal valuation give different figures?
Yes. A development appraisal may reflect a particular developer’s build costs, finance arrangements and target profit. A formal valuation is an independent opinion prepared for a defined purpose.
They can use different assumptions and answer different questions, so different figures can be expected.
