A mortgage valuation is carried out on behalf of your lender — not you. Its sole purpose is to confirm the property is adequate security for the loan. Here's exactly what the valuer looks for, what causes a down-valuation, and what you can do about it.
Key Points
A mortgage valuation protects the lender, not you — its purpose is to confirm the property is worth lending against
It is not a survey — it will not identify all defects or give you a detailed condition report
Most mortgage valuations take 20–45 minutes; some are now done as a desktop or drive-by AVM
If the valuation comes in below the agreed purchase price, your lender may reduce the loan amount — a "down-valuation"
You can challenge a down-valuation with comparable evidence
Cost: £150–£500 (often included free with certain mortgage products)
What Does a Mortgage Valuation Look For?
The mortgage valuer's task is to answer one question: "Is this property worth at least the amount the borrower wants to borrow against it?" To answer that, they look at:
🏠 Market Value
Recent comparable sales nearby
Current market conditions
Property type, size, and tenure
Location and local demand
Whether the agreed price is in line with market
🏗️ Physical Condition
General structural condition (visual only)
Roof condition (external check)
Significant damp or water ingress
Major cracks or structural movement
Whether the property is mortgageable at all
🏦 Lender Suitability
Construction type (standard vs non-standard)
Lease length (must meet lender's minimum)
Short leases, Japanese knotweed, cladding issues
Flood risk, contaminated land flags
Unusual tenure or title issues
📋 Saleability
Would this property sell easily if repossessed?
Demand in the local market
Any features that significantly restrict marketability
Occupancy and accessibility considerations
Common Causes of a Down-Valuation
Agreed price above comparable evidence
If recent sales of similar properties in the area don't support the agreed price, the valuer will state a lower market value — triggering a down-valuation.
Structural defects or significant damp
Visible cracks, major roof failure, or extensive damp may cause the valuer to apply a discount to reflect the cost of remediation — or to make the mortgage conditional on works.
Short lease
Most lenders require a minimum remaining lease term (typically 70–85 years). A lease below the lender's threshold can result in a refusal to lend or a significantly reduced valuation.
Non-standard construction
Concrete frame, steel frame, or other non-standard construction can make a property harder to resell — reducing its value as security in the lender's eyes.
Cladding / building safety issues
Post-Grenfell, flats in buildings with unresolved cladding or fire safety issues are regularly down-valued to £0 by lenders until an EWS1 certificate is provided.
How to Challenge a Down-Valuation
Obtain the valuation report — ask your lender for a copy of the valuation (they may charge a small fee).
Gather comparable evidence — find 3–5 recent sold prices (from Rightmove, Zoopla, or Land Registry) for similar properties that achieved a higher price.
Commission your own RICS Red Book valuation — an independent valuation from a different RICS-regulated valuer provides a credible counter-argument.
Formally challenge the lender — submit your evidence to the lender's underwriting or valuations team in writing. Many lenders have a formal appeals process.
Consider a different lender — if the first lender won't move, another lender may instruct a different valuer who reaches a higher figure.
Frequently Asked Questions
Is a mortgage valuation the same as a house survey?
No. A mortgage valuation protects the lender by confirming the property is adequate security. A house survey (Level 2 or Level 3) protects you by assessing the structural condition and identifying defects. You should commission your own survey even if your lender carries out a valuation.
What is a desktop or drive-by valuation?
For low-risk mortgages (high deposits, standard properties), lenders increasingly use automated valuation models (AVMs) or drive-by assessments where no internal inspection takes place. These are faster and cheaper — but less accurate for unusual or complex properties.
Can a mortgage valuation cause a sale to fall through?
Yes. A down-valuation can mean your lender offers a smaller loan than expected, leaving you with a funding gap. If you can't bridge that gap through a reduced purchase price, additional deposit, or a different lender, the purchase may not be viable.
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