Why a London commercial valuation comes in under the agreed price, and what to do about it

The valuation is the item on the critical path of almost every London commercial mortgage, and it is the one thing in the process neither the borrower nor the broker controls. Understanding what the valuer is actually doing is the difference between a survivable down-valuation and a collapsed deal.

What a Red Book valuation is, and is not

The RICS Red Book is the global standard for property valuation. Every commercial mortgage lender requires a Red Book valuation from a RICS-registered surveyor on its own panel before it will release funds. The valuer inspects the property, reads the leases and tenant covenants, examines comparable evidence, assesses condition, and reports market value, vacant possession value and, on a trading business, sometimes a separate goodwill figure.

The lender lends against that figure. Not against the price you agreed. Not against the price the agent quoted. This distinction sounds obvious written down and surprises borrowers constantly.

Three causes account for most London down-valuations

Thin comparable evidence. On a specialist asset, or in a district where very little turns over, the valuer has to reach further out for comparables and will discount for the lack of directly comparable transactions. This is a bigger problem in London than borrowers expect, because the city contains districts whose stock is so overwhelmingly commercial that there is almost nothing residential trading nearby to calibrate against.

A short unexpired term. A building with two years left on its main lease will not value like the same building with ten. Valuers price the term certain, not the headline yield.

A quoting price that reflects competitive bidding. London commercial agents run competitive processes. The price a competitive process produces is a real price, but it is not always a price the underlying investment arithmetic supports, and the valuer is not obliged to follow it.

The market temperature behind all of this

We track HM Land Registry price paid data as a market-temperature gauge. It is important to be clear about what this is: residential open-market sales data. It is not commercial transaction volume, commercial pricing or commercial yield evidence, and we never present it as such. What it does tell us is the direction of sentiment in a district, which is useful context for the conversation with a valuer.

Across the 12 months to May 2026, the Greater London median was £525,000 across 60,368 open-market residential sales, down 0.9% year on year. The spread inside that headline is the story. Kensington and Chelsea sat at £1,100,000, down 11.3%. Westminster at £820,000, down 9.8%. At the other end, Barking and Dagenham at £385,000, up 3.5%, and Croydon at £428,000, up 1.4%. Waltham Forest led the growth table at 4.6%.

Prime central is correcting. Outer London is holding or gaining. Valuers read the same market signals, and that asymmetry shows up in how conservatively a report is written. It is a reasonable working assumption in 2026 that a prime central asset carries more down-valuation risk than an outer-borough one, and worth pricing into your bid.

What to do when the figure comes back low

Four options, in ascending order of pain.

1. Increase the deposit. Keeps the facility at the LTV the lender will support and completes on time. Only available if the money exists.
2. Renegotiate the price. More achievable than people expect, because the vendor's next buyer will hit the same valuation.
3. Challenge the valuation. Only worth doing with genuinely better comparable evidence, not with an opinion. Success rates are modest but not zero.
4. Move lender. A different lender means a different panel valuer and potentially a different figure. It also means starting the timeline again and paying a second valuation fee.

The structural defence

The best protection against a down-valuation is not asking for maximum leverage in the first place. A case built at 65% has room to absorb a valuation 8% below the agreed price. A case built at 75% does not. On a compressed London yield the affordability test often caps the facility below the LTV ceiling anyway, so the headroom frequently costs less than borrowers assume.

If you want a view on down-valuation risk before you bid, send us the property and the lease position. We would rather have that conversation before the offer than after the report.