Mortgage valuations explained (and what to do if yours is low)

If you’re buying a home, a mortgage valuation can suddenly become a major part of the process—especially if it comes back lower than the price you agreed with the seller.

This guide explains what a mortgage valuation is, what it typically includes, how a low valuation can affect your mortgage, and the options available if you want to challenge (or work around) the result.

What is a mortgage valuation?

A mortgage valuation is an assessment carried out for the lender to help them decide whether the property is worth the amount being borrowed against it.

The key output is the lender’s view of the property’s market value, which then affects your loan-to-value (LTV) ratio.

Why LTV matters

Your LTV is calculated as:

• LTV = mortgage amount ÷ property value (as valued by the lender)

In general, a higher LTV can make it harder to get certain mortgage deals, because it represents more lending risk.

Mortgage valuation vs other property checks

It’s easy to mix these up:

• Estate agent valuation: often focused on marketing and pricing strategy.
• Mortgage valuation: focused on lender risk and what the lender can secure.
• Home survey (homebuyer report / building survey): focused on the property’s condition and defects.

A mortgage valuation is not the same as a full survey.

When does a mortgage valuation happen?

Mortgage valuations are typically carried out after you’ve applied for the mortgage and the lender has enough information to proceed—often once the property details are confirmed and the lender is ready to assess the security.

Valuations can also be carried out during remortgages, particularly where the lender needs to confirm the current value before lending or releasing equity.

What does a mortgage valuation include?

Mortgage valuation reports are usually shorter and more focused than surveys. They’re designed to give the lender a quick, evidence-based view of value and any material risks.

Common elements include:

• Estimated market value based on the surveyor’s assessment
• Comparable sales (similar properties sold nearby)
• Key risks or concerns that could affect value or lending risk

Who pays for the valuation?

Costs vary by lender and property type. Some lenders include valuation costs within the mortgage offer, while others charge separately.

What is a down valuation?

A down valuation is when the lender’s valuation comes back lower than the purchase price (or lower than the value assumed for the mortgage).

How it affects your mortgage

If the lender values the property at a lower figure, the mortgage is usually based on the valued amount, not the agreed purchase price.

For example:

• Purchase price: £280,000
• Lender valuation: £265,000

In many cases, the lender will calculate the mortgage using £265,000. That can increase the effective LTV and may require you to make up the shortfall.

What can you do if your valuation is low?

When faced with a down valuation, you generally have a few routes forward. The right option depends on how much the valuation is short, how flexible the seller is, and how quickly you need to complete.

1) Increase your deposit to cover the gap

If you can bring additional funds, you may be able to proceed without changing the purchase price.

This approach can be practical when:

• the shortfall is relatively small
• you have savings available
• the seller is not willing to reduce the price

2) Renegotiate the purchase price

You can ask the seller to reduce the price to align with the lender’s valuation.

This approach can work when:

• the seller is open to negotiation
• comparable evidence supports a lower price
• you want to keep your deposit unchanged

3) Seek a different lender (and a different valuation)

Because lenders use their own processes and surveyors, a valuation outcome can differ between lenders.

This route may be considered when:

• the down valuation is significant
• you believe the lender’s valuation is inconsistent with the market
• you’re willing to restart parts of the application process

Important: a second valuation is not guaranteed to be higher.

Can you challenge a mortgage valuation?

Yes—you can ask the lender to review the valuation. However, lenders typically expect clear, objective evidence showing why the valuation may be wrong.

What evidence tends to help

The strongest challenges usually include evidence that directly supports the market value and addresses the valuation reasoning.

Common examples include:

• Comparable sales: similar properties sold nearby within a recent timeframe
• Proof of improvements: receipts, invoices, and dated documentation for upgrades
• Independent valuation: a report from a qualified surveyor (where appropriate)
• Local agent input: written valuation evidence that supports the agreed price

How the challenge is usually handled

A lender will typically review the request based on the information you provide and whether it addresses the points raised in the valuation.

If the lender overturns the valuation, the mortgage terms may be recalculated based on the revised figure.

How long does a valuation review take?

Timelines vary by lender and the complexity of the case. Reviews often take several working days, but delays can occur if additional evidence is requested or if the lender needs further internal checks.

Should you get a homebuyer report or a full structural survey?

A mortgage valuation is about lender assurance. A survey is about protecting you.

Whether you choose a homebuyer report or a full structural survey depends largely on the property type and age:

• Homebuyer report: often suitable for many modern properties
• Full structural survey: often recommended for older, unusual, or higher-risk properties

Simple way to remember the difference

• Mortgage valuation: protects the lender
• Survey: protects you

How a broker can help when valuations become an issue

A mortgage broker’s value in a down valuation situation is usually in three areas:

• Understanding lender processes: which lenders are more likely to consider certain types of evidence
• Managing options: whether it’s better to renegotiate, adjust deposit, challenge, or switch lender
• Helping you prepare: ensuring the evidence you provide is relevant and presented in a way lenders can review

Because lenders may use different surveyors and valuation approaches, brokers can help you consider alternatives without treating the down valuation as a dead end.

Key takeaways

• A mortgage valuation is lender-focused and determines the LTV used for your mortgage.
• A down valuation happens when the lender values the property below the agreed price.
• You can usually respond by adding deposit, renegotiating, or seeking another lender.
• You can challenge a valuation, but success typically depends on strong, relevant evidence.
• A mortgage valuation is not a substitute for a survey.

Property assessments at a glance