Mistakes to Avoid
8 Pricing Mistakes to Avoid When Selling a Flat
The price you put on a flat is one of the biggest decisions in the sale, and one of the easiest to get wrong. Here are the eight pricing mistakes that cost flat sellers the most, and how to avoid each one.
Why Pricing a Flat Is Easy to Get Wrong
Price is one of the biggest decisions a seller makes, and a flat is harder to price than a house. The things that move a flat's value most (the lease length, the service charge, whether a mortgage lender will touch it) are invisible to the quick online tools most people start with, and easy to wish away when you have a figure in mind.
Get it too high and the flat sits unsold, gathers a reputation, and ends up selling for less than a sensible price would have fetched. Get it wrong in the other direction and you hand money to the buyer. Most pricing errors are not bad luck; they are predictable, and they come up again and again.
The eight sections below cover the main issues sellers run into when pricing a flat. You might also like to read our guide to valuing a leasehold flat, which covers how to work out a price in the first place.
1. Trusting an Online Estimate
The instant valuations on the property portals are built from averages and past sales in your postcode. They cannot see your lease length, what floor the flat is on, the state of the kitchen, the outlook from the window, or the size of the service charge. Leasehold flats are more difficult to value than freehold houses.
That is why an online automated valuation model (AVM) for a flat can be tens of thousands out in either direction. If anything, treat it as a rough guide rather than an accurate valuation. The same caution applies to a mortgage lender's AVM-based valuation, which leans on the same kind of data.
2. Pricing Off the Old Market
The sale price a neighbouring flat achieved in 2021 or 2022, or your own memory of what local flats were selling for at the peak of the market, is a poor anchor. Flats have not tracked the wider housing market: while house prices climbed after the pandemic, flat prices flat-lined, and in real terms they have fallen back from where they were a decade ago.
Price on what is selling now, not on the high-water mark. We set out the long trend in what London flats have sold for since 1995, and the reasons why UK flat prices are falling behind house prices.
3. Overlooking the Lease Length
Lease length is one of the biggest factors in what a flat is worth, and the one sellers often find difficult to account for. A buyer is not just buying the flat; they are buying the years left on the lease, and taking on the cost of extending it.
The thresholds are not gradual. Once the lease drops below 80 years, marriage value applies: an extra sum payable to the freeholder when the lease is extended, which pushes the extension cost up sharply. The Leasehold and Freehold Reform Act 2024 will abolish marriage value, but that change is not yet in force, so as things stand in 2026 it still applies. Below about 70 years the choice of mortgage lenders narrows, and below 60 the open market largely closes to anyone but a cash buyer.
A realistic price reflects the lease the buyer is actually taking on. Our guide to the costly mistakes on a short lease sale covers the lease-length pitfalls, and marriage value explained shows how the extension sum is worked out.
4. Believing the Highest Agent Valuation
It is normal to ask two or three estate agents what your flat is worth, and tempting to go with whoever gives the highest valuation. Some estate agents suggest a high asking price to win the instruction, then come back a few weeks later pressing for a reduction once you are signed up.
A flat priced too high at the start tends to sit unsold, and a flat that has been on the market too long often sells for less than one priced sensibly from day one. The useful question is not who quotes the highest figure, but who can back their figure with recent sold prices for flats like yours. Ask each agent to show the comparables, and treat a number with no evidence behind it as marketing hype.
5. Pricing on Asking Prices, Not Sold Prices
Browsing the portals to see what flats like yours are listed at is the obvious move, but it can be misleading. Asking prices are hopes; sold prices are facts. Two near-identical flats can be marketed at the same figure and complete thousands of pounds apart, and some listings linger for months precisely because the asking price was never realistic.
Sold prices are free to view on the HM Land Registry website. Compare like with like: the same block where you can, or neighbouring flats. Then similar floor, size and lease length. Our guide on valuing a leasehold flat explains how to read the comparable sales.
6. Forgetting the Costs a Buyer Prices In
A buyer does not value the flat on its own, they value the flat plus everything that comes with it. A high annual service charge, a ground rent that escalates, the leaseholder's share of an upcoming Section 20 works bill (the major-works costs a freeholder must consult on), or an unresolved cladding question all come straight off what someone will pay.
Price the flat as if none of that exists and the offers will look fine until a buyer's solicitor highlights the issues in conveyancing, at which point the price gets chipped or the sale falls through. It is better to know your numbers, be upfront about them, and price with them in mind. Our guides to service charges and EWS1 and cladding explain the two that most often move a price.
7. Pricing a Hard-to-Mortgage Flat Like Any Other
Some flats cannot be bought with a mainstream mortgage at all. A studio below a lender's minimum floor area, often around 30 square metres, a short lease, cladding with no EWS1 form, certain ex-council concrete construction, or a flat above a shop or restaurant can each put most lenders off.
When that is the case, the buyer pool shrinks to cash buyers and a handful of specialist lenders, and the price reflects that smaller market. Pricing as though any buyer could raise a mortgage is the classic way to see a sale collapse at the survey or lender's valuation, after weeks lost. If your flat falls into one of these categories, price for the buyers who can actually proceed. Our page on unmortgageable flats explains how those sales tend to work.
8. Letting the Price Go Stale
The first couple of weeks on the market are when the keenest buyers look, the ones with alerts set up on the portals (Rightmove and Zoopla) who have been waiting for a flat like yours. Price too high and you miss them, and the flat then drifts. A flat that has been on the market for months risks being seen as a problem property, rather than just an overpriced one.
Holding out for an over-ambitious figure usually costs more than pricing realistically at the start. You tend to reduce in the end anyway, but by then, to a tired audience who wonder why the flat has not sold. If the viewings are not coming in the first few weeks, take that as the market talking and adjust early rather than late.
Further Reading
Two related guides go further: how to work out a realistic price for a leasehold flat, and the mistakes that catch out short lease sellers in particular.
Frequently Asked Questions
Treat them as a rough starting point, not an accurate price. Automated estimates are built from postcode averages and cannot see your lease length, floor, condition or service charge, which are exactly the things that move a flat's value most. Use sold prices for similar flats to get closer to a real figure.
Significantly. A buyer factors in the cost of extending the lease, and the thresholds matter: below 80 years marriage value applies and the extension cost jumps, below about 70 years fewer lenders will lend, and below 60 years the open market largely closes. A flat with a long lease and an otherwise identical one with a short lease are not worth the same.
Be wary of it. A high valuation can be a tactic to win your instruction, followed by pressure to reduce once you are tied in. Ask each agent to support their figure with recent sold prices for comparable flats. The agent worth choosing is the one whose number has evidence behind it, not simply the biggest.
Sold prices are free to view on the HM Land Registry website, and the portals also show sold history. Compare like with like: ideally other flats in the same block, then similar size, floor and lease length nearby. Asking prices tell you what sellers hoped for, not what buyers paid, so lean on the sold figures.
Usually, yes. Few or no viewings after the first few weeks is the market telling you the price is too high. A meaningful, early reduction tends to work better than a slow drip of small ones, which lets the flat grow stale. If the price is right and it still will not sell, the pool of buyers may simply be small, in which case a cash sale is worth weighing against more time on the market.