Mortgage availability is the single biggest factor that determines how easy - or difficult - it is to sell a leasehold flat. If buyers cannot get a mortgage on your property, your pool of potential purchasers shrinks to a fraction of the normal market. Understanding exactly where the lender thresholds fall, and how they apply to your lease, is essential before you decide how to sell.
Can you get a mortgage on a short lease flat?
It depends on the remaining lease length - but not in the way most people expect. Lenders do not just look at how many years are left today. They look at how many years will be left at the end of the mortgage term. This is the detail that catches people out.
Here is how it works. Say a lender requires a minimum of 70 years remaining at the end of the mortgage term. If your buyer is taking out a 25-year mortgage, the lease needs to have at least 95 years remaining right now (70 + 25). A 30-year mortgage would need 100 years. Even a flat with 85 years on the lease - which sounds perfectly healthy - would fail this test.
This is why flats with 80-90 years remaining can be surprisingly difficult to sell. The lease looks adequate at first glance, but when the mortgage arithmetic is done, many lenders say no.
What the major lenders require
Every lender sets its own minimum lease length policy. Here is what the main high street lenders typically require as of 2025/26:
- Nationwide: Minimum 55 years remaining at the end of the mortgage term. For a 25-year mortgage, you need at least 80 years on the lease
- Halifax / Lloyds: Minimum 70 years remaining at the end of the mortgage term. Requires at least 95 years for a 25-year mortgage
- Barclays: Minimum 70 years remaining at the end of the mortgage term
- NatWest / RBS: Minimum 70 years remaining at the end of the mortgage term
- HSBC: Minimum 75 years remaining at the end of the mortgage term. Requires at least 100 years for a 25-year mortgage
- Santander: Minimum 70 years remaining at the end of the mortgage term
Important: These thresholds change. Always verify current requirements directly with the lender or through a mortgage broker. Some lenders also have separate policies for flats above commercial premises or in certain types of buildings.
The practical thresholds
In practice, the lease length thresholds break down into four bands:
- 95+ years: No issues. All mainstream lenders will consider the property. Your buyer pool is unrestricted
- 80-95 years: Some lenders start to drop out, particularly for longer mortgage terms. A good mortgage broker can usually still find options, but choice is more limited
- 60-80 years: Most high street lenders will decline. Some specialist lenders may offer mortgages, but typically at higher interest rates (often 1-2% above standard rates) and lower loan-to-value ratios (65-75% rather than the usual 90-95%)
- Under 60 years: The flat is effectively unmortgageable for the vast majority of buyers. A handful of private banks and specialist lenders may consider it for high-net-worth clients, but these are niche products
Why 80 years is the critical number
You will hear the 80-year threshold mentioned repeatedly in the context of short leases. It matters for two connected reasons:
- Mortgage availability drops sharply. As shown above, a flat with 80 years remaining only just scrapes into eligibility for Nationwide's criteria on a 25-year term, and fails for most other high street lenders
- Lease extension costs jump. Under current legislation, when a lease drops below 80 years, marriage value becomes payable. This is an additional amount the freeholder can claim - typically 50% of the "marriage value" created by the extension. It can add tens of thousands of pounds to the premium
These two factors reinforce each other. The flat becomes harder to sell at exactly the point when fixing the problem (extending the lease) becomes most expensive. This is why acting before the lease drops below 80 years is so strongly recommended by surveyors and property professionals.
How mortgage restrictions affect your sale price
The relationship between mortgage availability and sale price is straightforward: fewer eligible buyers means less competition, which means lower offers.
Consider this example. A two-bedroom flat in Brixton has a long-lease value of £450,000. With a 125-year lease, every buyer in the market can bid for it. With 70 years remaining, only cash buyers and those with specialist mortgages can purchase it. According to standard relativity tables, the flat is now worth around 83% of its long-lease value - roughly £373,500. That is a £76,500 reduction driven primarily by the restricted buyer pool.
With 50 years remaining, the position is worse. The flat is worth roughly 63% of long-lease value - around £283,500. That is a loss of £166,500 compared to a long lease, and almost all of it is down to the mortgage market being closed off.
Ground rent complications
Lease length is not the only factor lenders look at. Ground rent terms matter too, and they can trip up sales even when the lease is long enough. Most lenders will decline to lend if:
- The ground rent exceeds £250 per year (or £1,000 in London) at the start of the lease, as this could make it an Assured Shorthold Tenancy under the Housing Act 1988
- The ground rent doubles at regular intervals (common in leases from the 2000s-2010s)
- The ground rent is linked to RPI or another index without a cap
- The ground rent exceeds 0.1% of the property's value
The Leasehold Reform (Ground Rent) Act 2022 capped ground rents at a peppercorn for new leases granted from 30 June 2022. But it does not apply retrospectively to existing leases. If your lease has problematic ground rent terms, this is an additional barrier to selling on the open market - on top of any short lease issues.
What this means if you are trying to sell
If your flat's lease is too short for mortgage lenders, your buyer pool is limited to:
- Cash buyers (a small fraction of the market)
- Professional investors who understand lease complexities
- Specialist buyers like us who purchase short lease flats as a core business
This dramatically reduces demand for your property on the open market. Estate agents know this, and many will be honest about the difficulty of selling a short lease flat through conventional channels. Properties can sit on Rightmove for months with few viewings and no serious offers.
Your options if the flat is unmortgageable
You have three realistic paths forward:
- Extend the lease first, then sell. If you can afford the upfront cost and have 6-12 months to spare, extending the lease removes the mortgage barrier entirely. Your flat becomes a standard, easy-to-sell property. See our guide comparing lease extension and freehold purchase for the options
- Sell to a cash buyer. Buyers like us purchase short lease flats regardless of mortgage availability. We handle the lease ourselves after completion. You get a guaranteed sale in 2-4 weeks with no fees. The price will be below full market value, but there is no risk of the sale collapsing and no waiting
- Sell at auction. Property auctions attract cash buyers and investors. You get a set completion date (typically 28 days) and a legally binding sale once the hammer falls. But there is no guarantee of reaching your reserve price
For a detailed comparison of all your selling routes, see our selling options guide.
We buy flats regardless of lease length or mortgage availability - it is what we do. If you want to know what your flat is worth right now, get a free valuation or call us on 020 7183 3022 for a straightforward conversation about your situation.