How to Extend a Lease, Costs, Process, and When to Start

Why Lease Length Matters More Than You Think

When you buy a leasehold property in England or Wales, you are purchasing the right to occupy it for a fixed number of years. Once that term dwindles, so does the value of your home. Most high-street mortgage lenders will not lend against a property where the lease has fewer than 70 to 85 years remaining, and many require substantially more. A short lease can make a property almost unsellable without a price reduction that reflects the cost of the extension.

The sooner you act, the less expensive the process tends to be, and there is one critical threshold that changes the mathematics significantly.

The 80-Year Rule

When a lease drops below 80 years, an additional cost called **marriage value** kicks in. Marriage value is a share of the uplift in the property's worth that results from the extension itself. Freeholders are legally entitled to 50% of this uplift once the lease falls below 80 years, which can add tens of thousands of pounds to the premium you must pay. Above 80 years, no marriage value is payable under the current statutory framework.

If your lease currently sits between 82 and 90 years, act now. Do not wait.

Your Two Routes: Statutory vs Informal

The Statutory (Formal) Route

Under the Leasehold Reform, Housing and Urban Development Act 1993, qualifying leaseholders have the legal right to extend their lease by 90 years on top of the current term, at a peppercorn (zero) ground rent. To qualify you must have owned the property for at least two years, hold a long lease originally granted for more than 21 years, and the property must be a flat.

The formal process begins when your solicitor serves a Section 42 notice on the freeholder, specifying the premium you propose to pay. The freeholder has two months to respond with a counter-notice. Negotiations follow, and if agreement cannot be reached, either party can apply to the First-tier Tribunal (Property Chamber) to determine a fair premium.

The statutory route gives you certainty and legal protection but involves professional fees from both sides and can take anywhere from a few months to well over a year.

The Informal Route

Many freeholders will negotiate directly without triggering the formal statutory process. An informal agreement can be quicker and sometimes cheaper in professional fees, though you have no legal right to the 90-year extension or the peppercorn ground rent. Always have a solicitor review any informal offer before agreeing.

Typical Costs

In addition to the premium, expect to pay: your solicitor's fees (£1,500–£3,000+), a specialist lease extension surveyor (£500–£2,000+), the freeholder's reasonable legal and valuation costs (you are required to cover these under statute, typically £1,000–£2,500), and Land Registry registration fees.

The Process Step by Step

1. Check your title register, confirm lease length and freeholder details

2. Instruct a specialist solicitor and valuer experienced in lease extension

3. Obtain a valuation advising on an appropriate premium to offer

4. Serve the Section 42 notice

5. Negotiate through respective advisers

6. Agree the premium and terms; execute the lease extension deed

7. Register at HM Land Registry

If You Are Buying a Short Lease Property

If you are purchasing a property with a short lease, negotiate a price reduction that accounts for the extension cost, or make the purchase conditional on the seller serving the Section 42 notice and assigning their right to extend to you on completion (a notice assignment).

Recent Reforms

The Leasehold and Freehold Reform Act 2024 introduced changes including removal of the two-year ownership requirement and removal of marriage value from the premium calculation for most leaseholders. Some provisions are being phased in, always confirm the current position with your solicitor. Property Passport UK records lease data where captured, providing a useful starting point before instructing anyone.