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A down valuation is when the lender’s valuer decides the property is worth less than the price you have agreed to pay. The lender then lends against the lower figure, so the gap has to come from somewhere: a bigger deposit, a lower price or a different lender. New build is more exposed to this than second hand homes, because the price is set by the developer rather than by a market of comparable sales, and because incentives can make the headline price look higher than the real one.
Why new build gets down valued
Three reasons come up again and again. The new build premium: a brand new home usually sells for more than the same home would fetch a year later, and valuers know it, so they may value it closer to the resale figure than the developer’s price. A lack of comparables: on a new development the only recent sales may be other plots sold by the same developer at the same premium, which a cautious valuer may discount. And incentives: the valuer sees the UK Finance Disclosure Form, and a large package of deposit contributions and paid stamp duty can suggest the price has been set to accommodate them. None of that means the home is a bad buy. It means the lender’s view of the value and the developer’s view of the price can differ.
The lender lends against the valuation, not the agreed price, so a down valuation means a funding gap.
New build is more exposed because of the premium, thin comparables and the effect of incentives.
The options are renegotiate, challenge with evidence, add deposit, change lender or walk away.
How common is it?
There is no reliable published figure for how often new build homes are down valued, and I would be wary of anyone quoting one. Broker commentary in 2026 suggests down valuations have been more frequent in a flat market, while at least one large surveying firm has said the proportion of valuations below the agreed price has stayed broadly stable. What I can say from my own cases is that it is not unusual on new build, and that it is rarely a surprise to anyone who has looked at the plot price against resales in the area beforehand.
Option one: renegotiate the price
The valuation report is evidence, and developers know a down valuation will follow the plot to the next buyer’s lender too. Late in a development, or near a quarter or year end, developers can be flexible. Ask for the price to be reduced to the valuation, or for the gap to be covered by a larger incentive, bearing in mind that incentives have their own lender limits, which I cover in my guide to new build incentives and your mortgage.
Option two: challenge the valuation
Lenders allow appeals, but only with evidence. That means recent comparable sales, ideally three, of similar properties nearby, from Land Registry data or the developer’s own completed sales at similar prices. Opinion does not move a valuer; comparables sometimes do. Appeals succeed less often than buyers hope, so I treat this as one step, not the whole plan.
Option three: increase your deposit
If you can fund the gap from savings or a gift, the purchase proceeds at the agreed price with a smaller loan. A gifted deposit from family needs the usual letter and source of funds checks, and my guarantor and JBSP mortgages page covers the family help routes if the gap is bigger than a gift can cover.
Option four: try another lender
A different lender uses a different valuer, or a different valuation panel, and may come to a different figure. It is not guaranteed and it costs time and sometimes a second valuation fee, but on new build, where the judgement about the premium is genuinely subjective, it works more often than on second hand homes. I would only do this if the first valuation looks out of step with the evidence.
Option five: walk away
If the valuation is a long way below the price and nothing above closes the gap, the valuer may be telling you something worth hearing. Before exchange you can withdraw and lose only your reservation fee in most cases. After exchange it is far more costly, which is why the mortgage and valuation should be in place before you exchange on a new build wherever the developer’s timetable allows.
Speak to an expert
Had a down valuation on a new build? Send me the valuation figure, the agreed price and your deposit and I will tell you which of the five routes is realistic for your purchase.
Down valuations and your loan to value
The practical damage is to your loan to value. If you agreed £350,000 with a 10% deposit and the valuation comes in at £335,000, the lender’s 90% is now £301,500 rather than £315,000, so you need £13,500 more from somewhere, and your loan to value on the lender’s figures may tip into a higher rate band. That knock on effect on the rate is often overlooked and can matter as much as the gap itself. My guide to valuations and surveys explains what the lender’s valuation is for and what it is not.
Reducing the risk before you reserve
Look at what similar completed homes on the development or nearby have actually sold for, not what they were listed at. Ask the developer how recent plots have valued. Keep incentives proportionate. And get the mortgage application and valuation moving early, so a problem surfaces while you still have room to renegotiate. My new build mortgages page covers the rest of the process.
Which route is right for you?
It depends on the size of the gap, how much deposit you can add, how the developer is placed and whether the valuation looks fair against the evidence. Working that out quickly, with the developer’s deadline running, is what an advice appointment is for. Call me on 01425 203055 or book a 15 minute call.
Need Personal Mortgage Advice?
Every buyer’s situation is different. While this guide explains the general rules, the right mortgage for you depends on your income, deposit, credit history and future plans. If you’d like tailored advice, I’m here to help, with whole-of-market coverage.
