Short Lease Mortgage: What to Do Under 80 Years

A short lease is one of the most significant barriers to getting a mortgage in the UK. When a lease drops below certain thresholds, the number of willing lenders shrinks dramatically — and the cost of extending the lease rises steeply. Understanding the numbers is essential before you commit to a short-lease property.

The Lease Length Thresholds

Different lease lengths trigger different responses from lenders:

The critical distinction is not just the current lease length, but the lease length at the end of your mortgage term. If you take out a 25-year mortgage on a property with 95 years remaining, the lease will be 70 years at the end of the term — and some lenders will not accept that.

The 80-Year Cliff Edge

This is the single most important number in short-lease mortgages. When a lease has more than 80 years remaining, extending it is relatively straightforward and affordable. When it drops below 80 years, the cost of extension increases dramatically because of something called marriage value.

Marriage value is the increase in property value that results from extending the lease, and the freeholder is entitled to 50% of it. In practice, this means:

• A lease extension from 85 years might cost £5,000-15,000
• A lease extension from 75 years might cost £15,000-40,000+
• A lease extension from 60 years might cost £40,000-80,000+

These figures vary enormously depending on the property value and location, but the jump at the 80-year mark is real and significant.

Leasehold Reform: What Is Changing?

The Leasehold and Freehold Reform Act 2024 received Royal Assent and includes provisions to:

• Abolish marriage value — removing the 80-year cliff edge
• Cap ground rent to a peppercorn (zero) on lease extension
• Simplify the extension process and make it cheaper
• Extend the standard extension to 990 years (up from 90 years for flats)

However, many of these provisions require secondary legislation to take effect, and implementation has been gradual. As of early 2026, some provisions are in force while others are still awaiting commencement dates. Check the latest position, as this is a moving target.

Getting a Mortgage on a Short Lease

Step 1: Negotiate a Lease Extension Before Purchase

The cleanest approach is to negotiate with the seller to extend the lease before you complete the purchase. The seller has the legal right to extend (if they have owned the property for at least 2 years), and the cost of extension can be reflected in the purchase price.

Some sellers will extend the lease and add the cost to the asking price. Others will reduce the asking price to reflect the short lease, leaving you to extend it after purchase (once you have owned for 2 years).

Step 2: Factor Extension Costs into Your Budget

If you are buying a short-lease property, treat the lease extension cost as part of the purchase price. A flat priced at £200,000 with a 70-year lease that will cost £30,000 to extend is really costing you £230,000.

Step 3: Find a Willing Lender

Lenders who may consider shorter leases include:

• Accord Mortgages — more flexible on lease length in some circumstances
• Kensington Mortgages — specialist lender willing to consider non-standard situations
• Some building societies — individual assessment rather than rigid criteria
• Specialist lenders — some specifically cater to short-lease properties

Most high street lenders will require a minimum of 70-85 years remaining at the end of the mortgage term. If the lease does not meet this, they may lend on the condition that it is extended before or shortly after completion.

The Formal Lease Extension Process

Under current law, if you have owned a leasehold property for at least 2 years, you have a statutory right to extend the lease. The process involves:

1. Serve a Section 42 notice on the freeholder — a formal notice exercising your right to extend
2. The freeholder responds with a counter-notice (they cannot refuse, only dispute the terms)
3. Negotiate the premium — this is the cost of the extension
4. If you cannot agree, the matter can go to the First-tier Tribunal (Property Chamber) for determination
5. Complete the extension — typically 6-12 months from start to finish

Costs Involved

• The premium — the payment to the freeholder (varies widely)
• Your solicitor's fees — £1,500-3,000+
• The freeholder's reasonable legal costs — you pay these too (£1,000-2,000+)
• Valuation fees — for a surveyor to calculate the premium (£500-1,500)
• Tribunal fees — if the matter goes to tribunal

Practical Advice

1. Get a lease extension valuation before making an offer — know exactly what the extension will cost
2. Check the ground rent — high or escalating ground rent can cause problems independently of lease length
3. Negotiate with the seller — they know the short lease depresses the value; use this in negotiations
4. Act quickly if you own a short lease — every year you wait, the extension costs more
5. Use a specialist leasehold solicitor — the lease extension process is technical and getting it wrong is expensive
6. Consider informal (voluntary) extensions — sometimes the freeholder will agree to extend without the formal statutory process, which can be faster and cheaper (but offers fewer protections)

When to Walk Away

A short lease can be a genuine bargain if you factor in the extension costs and still get a good deal. But there are situations where the numbers do not work:

• If the extension cost plus purchase price exceeds the value of the property with a long lease
• If the freeholder is unresponsive or difficult (making the extension process slow and expensive)
• If the ground rent is onerous and the lease terms are unfavourable
• If no lender will offer a mortgage and you do not have cash to purchase outright

Always run the full numbers — including all extension costs and fees — before committing.

This is educational content, not financial advice. Your situation is unique — speak to a qualified mortgage broker before making any decisions.