Mortgage Valuation: What It Is, What It Costs, and What to Do If It Comes In Low

A mortgage valuation is one of the most misunderstood stages of buying a home. Most buyers think it exists to protect them. It doesn’t. It protects the lender. Understanding that single fact changes how you handle the whole process, especially if the valuation comes back lower than the price you agreed.

This guide explains what a mortgage valuation actually is, what it costs in 2026, how long it takes to turn into an offer, and exactly what to do if the surveyor values the property below your offer. We deal with down valuations across the whole market, so this is the playbook, not the sales pitch.

What is a mortgage valuation?

A mortgage valuation is a check the lender carries out to confirm the property is worth roughly what you have agreed to pay. It reassures the lender that if you stop paying and they have to repossess and sell, they can recover the loan.

It is not a survey. A valuation does not assess the condition of the property in any meaningful detail. It will not flag a failing roof, damp, or a structural problem in the way a proper survey would. Treating a valuation as a health check on the building is the most common and most expensive mistake buyers make.

What do they do on a mortgage valuation?

The surveyor confirms the property exists, matches the description, and supports the loan amount. Depending on the lender and the property, this happens in one of three ways.

• Automated valuation (AVM): A computer model using recent sold prices and property data. No one visits. Common on lower loan-to-value cases and straightforward properties.
• Desktop valuation: A qualified surveyor values the property remotely using data and photos, without attending in person.
• Physical valuation: A surveyor visits the property, usually for around 15 to 30 minutes, and compares it against recent local sales.

AVMs are fast and free but blunt. They struggle with unusual properties, recently renovated homes, and areas with few comparable sales. If your property is anything other than standard, a physical valuation gives you a fairer result and a stronger position if you need to challenge it later.

How much does a mortgage valuation cost?

Here is where every high-street guide goes vague. The truth is that many lenders now include a free basic valuation as part of the mortgage product. Skipton Building Society, for example, does not charge for a standard valuation on properties under £1.5 million. Where a fee does apply, it scales with the property value.

A typical lender valuation fee scale in 2026 looks like this:

• Up to £100,000: around £200
• Up to £250,000: around £275
• Up to £500,000: around £400
• Up to £1,000,000: around £875
• Above £1,000,000: £1,275 and up, banded by value

These fees are usually non-refundable, so check whether your chosen product includes a free valuation before you pay for one. This is one of the simplest costs a broker can remove from a deal, and it is routinely overlooked.

Valuation versus survey: do not confuse the two

The lender valuation tells you nothing about the condition of the building. If you want that protection, you pay for a separate RICS home survey. In 2026 the three levels cost roughly:

• Level 1 (Condition Report): around £300 to £900. Basic, best for new or near-new homes.
• Level 2 (HomeBuyer Report): around £400 to £1,000. Suitable for most conventional properties in reasonable condition.
• Level 3 (Building Survey): around £600 to £1,000 and above for older, larger, or unusual homes.

Spending a few hundred pounds on a survey before you exchange can save tens of thousands after you move in. It is one of the few places in the buying process where the cheap option is usually the wrong one.

How long after a mortgage valuation to an offer?

Once the valuation is complete and the lender is happy, a formal mortgage offer usually follows within a few days to around two to four weeks. Some lenders issue an offer within 48 hours of a clean valuation. The variable is not the valuation itself, it is how many underwriting questions remain on your file.

The valuation report itself is typically valid for around six months, and most mortgage offers last three to six months. If your purchase drags on beyond that, the lender may require a fresh valuation before completion. If you want the full picture of what happens either side of this stage, see our guide on how long a mortgage application takes.

Why would a mortgage be declined after a valuation?

A valuation can derail an application even when your income and credit are fine. The common reasons are:

• Down valuation: the surveyor values the property below your agreed price, breaking the lender’s loan-to-value limit.
• Property defects: serious issues such as subsidence, structural movement, or damp that make the property poor security.
• Unmortgageable construction: non-standard construction, spray foam insulation, or short-lease flats that fall outside the lender’s criteria.
• Cladding or EWS1 issues: flats in taller buildings without the correct fire-safety documentation.

Most of these are lender-specific. A property one bank refuses to lend on can be perfectly mortgageable with another. This is exactly where a whole-of-market broker earns their fee: matching the property to a lender whose criteria actually fit it.

What happens if a mortgage valuation is less than the offer?

This is the scenario that causes the most panic, and the one no bank guide properly resolves. A down valuation means the lender will lend against the lower figure, not your agreed price. You have to make up the difference.

Say you agreed £300,000 with a 10% deposit of £30,000, expecting a £270,000 loan at 90% loan-to-value. The surveyor values the property at £285,000. The lender will still only lend 90%, but now of £285,000, which is £256,500. Your deposit has to rise from £30,000 to £43,500 to complete at the original price. That is the mechanism buyers actually fear, and it is why a down valuation needs a plan, not a panic.

Your down valuation playbook

You have four practical routes, and they are not mutually exclusive.

• Renegotiate the purchase price. The lender’s own valuation is strong evidence. Take it back to the seller and ask them to meet the valuation. In a flat or softening market this is often the cleanest outcome.
• Increase your deposit. If you have the funds, topping up your deposit preserves the loan-to-value and lets the purchase proceed at the agreed price.
• Challenge the valuation with evidence. Lenders do not overturn valuations on opinion. You need three recent, genuinely comparable sales, ideally within the last three to six months, plus evidence of any improvements. Appeals usually take five to fifteen working days and are normally free.
• Switch lender. Different lenders use different surveyors and criteria. A second valuation from a lender better suited to the property can come back at a different figure. Check who the new lender uses so you are not walking into the same result.

The right move depends on the property, the market, and your cash position. Doing the maths across all four options, quickly, before your chain wobbles, is the whole point of having a broker.

Self-employed and buy-to-let valuations

If you are self-employed, the valuation is not the problem, but it sits alongside tighter affordability checks, so a down valuation on top of a lower borrowing figure can squeeze a deal from both ends. Our self-employed mortgage guidance covers how lenders assess your income.

On buy-to-let, the surveyor also assesses a market rent, and the lender runs that figure through an interest coverage ratio. A low rental valuation can cap your borrowing even when the capital value stacks up. Landlords need both numbers to work, which the high-street guides never mention.

The broker’s role in a valuation

A bank can only ever value your property through its own surveyor against its own criteria. A whole-of-market broker does three things a lender cannot. We pick lenders with valuation criteria that suit your property before you apply, so a down valuation is less likely in the first place. We manage and evidence an appeal if one does come in low. And if the property genuinely will not value with one lender, we move it to another without you starting from scratch.

That is the difference between explaining the problem and solving it.

Frequently asked questions

What do they do on a mortgage valuation?

The lender’s surveyor confirms the property exists, matches its description, and is worth enough to secure the loan. It is done by automated model, remote desktop assessment, or a short physical visit of around 15 to 30 minutes. It is not a condition survey.

How long after a mortgage valuation to completion?

The valuation usually turns into a formal offer within a few days to two to four weeks. Completion then depends on your conveyancing and chain, typically several more weeks. The valuation report is generally valid for around six months.

Why would a mortgage be declined after a valuation?

Common reasons are a down valuation breaking the loan-to-value limit, serious property defects such as subsidence or damp, non-standard construction, or missing cladding and fire-safety documentation. Many of these are lender-specific and can be solved by moving to a different lender.

What happens if a mortgage valuation is less than an offer?

The lender lends against the lower figure, so you must cover the shortfall. Your options are to renegotiate the price down to the valuation, increase your deposit, challenge the valuation with comparable evidence, or switch to a lender likely to value it differently.

Speak to a Mortgage Adviser

If you have questions or want to discuss your options, book a free discovery call below.

Book a Free Discovery Call

---

Your home may be repossessed if you don’t keep up repayments on your mortgage.

Knox Mortgages is a trading style of Fort Advice Bureau which is regulated and authorised by the FCA to conduct Mortgage and Protection business, FRN: 972730