7 Top Valuation Review Mistakes to Catch

A report can be technically well reasoned and still contain one detail that creates an avoidable lender query. The top valuation review mistakes are rarely dramatic errors in methodology. More often, they are figures that no longer reconcile after an amendment, a lease date copied from an earlier draft, or comparable evidence that supports a conclusion on one page but not another.

That is understandable. A valuation report is not written in a single pass. Instructions change, evidence develops, discussions take place and wording is refined under time pressure. The final review needs to read the report as one document, rather than as a series of individually correct sections.

1. A market value that does not reconcile throughout the report

A mismatch between the stated market value and a figure elsewhere in the report is one of the clearest examples. The summary may state £2,450,000, while the valuation rationale, security section or conclusion retains £2,500,000 from a previous draft. Both figures may be plausible. That is precisely why the discrepancy can survive a quick read.

The issue is not only presentational. A lender or panel reviewer needs to know which figure the valuer intends to rely on. A contradiction can prompt a referral even where the final opinion of value is sound.

Review this by tracing the adopted value through the executive summary, valuation section, lending section, calculations, sensitivity commentary and any appendices. Do the same for market rent, investment value where reported, and figures stated in words. A document-level audit is useful here because it can flag a £50,000 variation that a reviewer may not spot when checking sections separately.

2. Incorrect floor areas in calculations or comparable analysis

Area errors often arise during perfectly ordinary drafting changes. A Net Internal Area may be updated in the property description, but the adopted £ per sq m rate still uses the earlier area. Alternatively, a comparable may be stated as 1,200 sq m in the schedule and 1,020 sq m in the narrative.

The resulting capital value can look reasonable, particularly where there is a range of evidence. But the calculation is no longer transparent. It becomes harder for a reviewer to follow how the adopted rate and valuation figure were reached.

Start with the subject property. Check that the measurement basis is stated consistently and that every calculation uses the same area. Then test each comparable: area, price, rent, rate, date and source should agree between the evidence table and the written analysis. Where a different basis has been adopted, such as GIA for an industrial property, make the adjustment explicit rather than leaving the reader to infer it.

3. Lease terms that do not support the adopted yield or rent

A lease is not just background detail. Unexpired term, break options, rent review pattern, repairing obligations, incentives and tenant covenant all inform the analysis. A report can be internally inconsistent where the lease section records an expiry in 2031, but the investment rationale refers to seven years unexpired when the actual term is closer to five.

The same problem appears when the passing rent, estimated rental value and market rent are used interchangeably. A capitalisation calculation may apply a yield to £180,000 per annum, while the narrative describes the property as reversionary to a market rent of £200,000 per annum. That may be correct, but only if the valuation approach explains which income stream has been capitalised and why.

A sound review cross-checks lease dates against the unexpired term stated in the report and tests the rent used in every calculation. It also checks that the narrative on covenant strength is consistent with the evidence available and with the risk reflected in the adopted yield. The aim is not to force a standard conclusion. It is to make sure the conclusion follows from the facts recorded.

4. Comparable evidence that is present but not sufficiently connected

A schedule of comparables does not, on its own, demonstrate analysis. One of the more common valuation review mistakes is allowing the report to move from a list of transactions to an adopted figure without showing the bridge between them.

For example, three comparable sales may range from £3,800 to £4,300 per sq m. If the subject is adopted at £4,150 per sq m, the report should make clear why: perhaps it has a superior specification, but inferior access; perhaps the evidence is older and the market has moved; perhaps the subject’s lease profile differs materially. The explanation need not be lengthy, but it must be there.

Review comparable evidence in two directions. First, confirm that every comparable cited in the narrative appears accurately in the schedule. Second, check that the most influential comparables are actually discussed. Pay particular attention to dates, transaction status, incentives, special assumptions and whether the evidence is genuinely comparable to the interest being valued.

This is also where client-specific requirements matter. If an instruction requires a minimum number of relevant comparables, the final review should confirm that the report meets that threshold and that the evidence is not merely repeated in different forms.

5. Assumptions, disclosures and lender requirements left behind in drafting

Some requirements sit outside the core valuation calculation, which makes them easy to miss in a busy report. Marketing periods, special assumptions, material uncertainty wording, cladding or EWS1 disclosures, and stated lending assumptions may all be required by the instruction or relevant to the property.

The risk is often not that the valuer has failed to consider the matter. It is that the consideration has not made it into the final report, or has been included in one section but contradicted in another. A residential report might note an EWS1 position in the property description but make no reference to its relevance in the valuation commentary. A commercial report might refer to a six-month marketing period in the market section and three months in the conclusion.

The review method should begin with the instruction. Create a direct check between each required disclosure and its location in the report. Then search for related terms and dates across the full document. This helps identify not only an omission but also competing versions of the same assumption.

6. Yield, rate and arithmetic errors hidden by plausible outputs

Arithmetic checks are not beneath an experienced reviewer. They are an efficient way of testing whether a report says what it means. A yield shown as 5.25% rather than 5.75%, a decimal entered incorrectly, or a rate applied to the wrong area can alter the result materially while still producing a figure within a broadly credible range.

Consider a property valued by capitalising £240,000 per annum. At 5.25%, the simple capital figure is approximately £4.57 million. At 5.75%, it is approximately £4.17 million. The valuation rationale may justify either yield in a different context, but the report cannot support one while calculating the other.

Reperform key calculations independently: rent multiplied by area, price divided by area, income divided by value, and any gross-to-net or purchaser’s-cost adjustments. Check percentages against the figures they describe, not just against the wording around them. Where a discounted cash flow has been used, review the treatment of voids, incentives, rent reviews and exit yield as well as the final present value.

7. Contradictions created by late amendments

Late amendments are often necessary. New evidence may emerge shortly before sign-off, or a client may clarify the instruction. The difficulty is that a single change can affect several parts of the report: the comparable schedule, market commentary, adopted yield, valuation calculation, conclusion and correspondence-ready summary.

A revised comparable at £4,100 per sq m may lead to a change in the adopted rate. If the conclusion changes but the narrative still refers to £3,950 per sq m, the report gives the reader two different explanations for the same opinion.

This is where a final whole-report review has value. Read the report in the order a lender will read it, then trace every revised input to its downstream references. Focus particularly on headings, tables, executive summaries and appendices, because these sections are often copied or updated at different points in the drafting process.

A second pair of eyes before issue

The purpose of review is not to second-guess the valuer’s judgement. It is to remove avoidable noise from a report so that the professional opinion is clear, evidenced and defensible. Manual review remains essential, especially for the reasoning behind a valuation and the relevance of the evidence.

For repetitive cross-checking, WriteUp can support that final pass by reviewing a draft report in one to two minutes and flagging figures that do not reconcile, missing disclosures and report-wide contradictions. It is built by a practising MRICS Chartered Surveyor and operates as a second pair of eyes, with the valuer retaining control of every finding. Reports are processed privately and encrypted, with no storage or model training on report data.

Before a report leaves your desk, the most useful question is simple: if a reviewer follows every figure, date and assumption from the first page to the last, will they arrive at the same conclusion you did?