Should You Extend Your Lease Before Selling Your Flat?

The answer turns almost entirely on one number: how many years are left on the lease. Above roughly 90 years, extending before a sale is rarely worth the cost and delay. Between 80 and 90, it’s a judgement call worth making carefully. Below 80 years, the lease is actively costing you buyers and value, and the real decision is whether to extend, sell with the extension process started, or sell as-is to a buyer who doesn’t need a mortgage.

We at Sell House Fast buy flats at every lease length, so we see how each of these plays out. Here’s the framework we’d suggest, with the honest costs on each path.

Why 80 Years Is the Line That Matters

Two things happen as a lease approaches 80 years. Mortgage lenders tighten: many want a healthy unexpired term remaining at the end of the mortgage, and as the lease shortens, the pool of willing lenders shrinks with it, taking most of your buyers along. And once the lease drops below 80 years, “marriage value” enters the extension calculation, meaning the freeholder becomes entitled to a share of the value the extension creates, which makes extending materially more expensive from that day on.

The practical consequence: a 82-year lease is a different asset from a 78-year one, and if yours is in the low 80s, the clock is genuinely running.

The Case for Extending First

A flat with a long lease sells to the whole market at full value, simply and without explanation. If your lease is below about 85 years, extending before marketing typically:

• Restores access to mortgage-dependent buyers, which is most buyers
• Removes the discount short leases attract, which usually exceeds the extension’s cost
• Prevents the mid-sale renegotiation that happens when a buyer’s solicitor “discovers” the lease length

The costs are real, though. A statutory extension adds 90 years at a peppercorn ground rent, but the premium runs from thousands to tens of thousands depending on the flat’s value and the term remaining, plus your professional fees and, historically, the freeholder’s. The process commonly takes six months or more, sometimes well beyond that if the premium is disputed. Extending first suits sellers with the capital available and no pressure on time.

The Middle Route: Sell With the Notice Served

There’s a well-used compromise. A qualifying leaseholder can serve the statutory extension notice and then sell the flat with the benefit of that notice assigned to the buyer. The buyer completes the extension after purchase, and crucially inherits your position rather than starting from scratch.

This route suits sellers who can’t fund the premium or wait out the process, while still offering buyers a defined path to a long lease. It needs a solicitor who’s done it before, and the price will reflect that the buyer is taking on the extension’s cost, but it keeps mortgage-backed buyers in play far better than a bare short lease does.

Selling As-Is, and Who Actually Buys Short Leases

Below 80 years, and especially below 70, the open market thins to investors and cash purchasers, since most lenders step away. Flats at these lengths absolutely still sell, but slowly through agents, with each mortgage-dependent buyer’s collapse costing months.

This is where we work daily. As residential flat buyers purchasing with our own funds, we buy short-lease flats as they stand, with the lease priced honestly into the offer, no fees to you, and completion in around a week. We’re clear about the economics: our offers reach up to around 85% of a property’s market value, and for a short-lease flat, market value already reflects the lease, so what you’re trading further value for is a completion date you can actually put in the diary. Where that trade makes sense is when the extension premium is beyond reach, the flat has already lost buyers to the lease, or time matters more than the last increment of price. Where it doesn’t, we’re upfront about that too: a seller with an 84-year lease, savings available and no deadline is usually better extending first, and our valuation gives you the as-is figure to test that against.

The Reform Question

Leasehold law has been through a period of reform, with changes to extension rules legislated and implemented in stages. Before spending a large premium, it’s worth asking a leasehold solicitor or surveyor where the rules stand at the point you’d commit, since timing a statutory extension around the current regime can meaningfully affect the cost. What reform hasn’t changed is the market reality above: lenders still price lease length, and buyers still follow lenders.

FAQs

How much does a short lease reduce a flat’s value?

It scales with the remaining term. A lease in the mid-80s might trade a few percent below long-lease value, while one in the 60s can be discounted by well over ten percent, reflecting the growing extension premium a buyer inherits.

Can I sell a flat with fewer than 70 years on the lease?

Yes, though realistically to cash buyers and investors, since mainstream mortgage lending largely falls away. Pricing it correctly for that market from the start saves months.

How long does a lease extension take?

Informal extensions agreed with a cooperative freeholder can be quicker; the statutory route commonly runs six months to a year, longer if the premium goes to tribunal. Build that into any plan to extend before selling.

Do I have to own the flat for two years before extending?

The two-year ownership rule for statutory extensions has been an area of legal reform, so check the current position with a leasehold specialist before planning around it, particularly if you’ve recently inherited or purchased the flat.

Will a cash buyer care about the lease length?

We care in the sense that it shapes the offer, since we’re pricing what we’re actually buying. What we won’t do is withdraw or renegotiate because of it: the lease is known at the start, priced at the start, and the agreed figure is what we pay.