When a formal valuation is required, the purpose, valuation date, assumptions and intended users matter as much as the final figure. This guide explains what a Red Book valuation includes and when one may be needed.
The "Red Book" is shorthand for the RICS Valuation – Global Standards, the framework RICS Registered Valuers follow when preparing a formal valuation. It sets out how a valuation should be scoped, what evidence should support it, and how the resulting report should be structured, so that anyone relying on the figure can understand exactly what it represents.
A price opinion from an estate agent is just that — an opinion, usually given informally and often with an eye to winning an instruction. A Red Book valuation is different: it is prepared independently, to a defined methodology, by a valuer who has no interest in whether or how the property is sold. That independence and consistency is precisely why lenders, courts, HMRC and other professional advisers give the figure weight.
Every Red Book report addresses the same core elements: the purpose of the valuation, the basis of value being used, the valuation date, any assumptions or special assumptions made, and who is entitled to rely on the conclusion. Getting these right at the outset matters — a valuation prepared for one purpose is not automatically appropriate for another, even if the property and date are the same.
Red Book valuations are most commonly instructed for probate and inheritance tax, capital gains tax, matrimonial and dispute-related matters, loan security, and company accounts. In each case, the person or body relying on the figure needs confidence that it was reached independently and would hold up if scrutinised. If you are approaching one of these situations, it is worth having that conversation before committing to anything else.