If your lease is getting short, extending it is one of the most important things you can do to protect your property's value. Lenders get nervous below 80 years and many refuse to lend on properties with fewer than 70 years remaining, so acting before you cross that threshold makes a real financial difference.
The total cost of a lease extension has several parts: the premium you pay to your freeholder, your own solicitor and surveyor fees, and the freeholder's reasonable legal and valuation costs that you are legally required to cover. This guide breaks down each element with realistic 2026 figures so you know what to budget before you start.
What Is a Lease Extension and Who Can Apply?
A lease extension adds years to the remaining term on a leasehold property. Under the Leasehold Reform, Housing and Urban Development Act 1993, most flat owners who have owned their property for at least two years have a statutory right to extend their lease by 90 years on top of what is left, at a peppercorn ground rent. This is the formal route most people use because it gives you legal protections and caps what the freeholder can charge.
Alternatively, you can negotiate informally with your freeholder at any time, without waiting two years. The informal route is sometimes cheaper and faster, but you have fewer legal protections and the freeholder can set their own terms. Most solicitors recommend the formal statutory route unless you have a straightforward situation and a cooperative freeholder.
- Statutory route: Protected by law, freeholder must accept a reasonable premium, you cover their reasonable professional costs.
- Informal route: Quicker to start, no legal minimum, freeholder can decline or impose unfavourable terms such as an increased ground rent.
- Eligibility: Must have owned the flat for at least two years and hold a long lease (originally granted for more than 21 years).
The Lease Extension Premium: What You Actually Pay the Freeholder
The premium is the payment you make to the freeholder in exchange for the extended lease. It is calculated using a statutory formula that takes into account the current ground rent, the number of years remaining, the value of the property and the investment return a freeholder could expect. The fewer years left and the higher the property value, the larger the premium.
The premium calculation becomes significantly more expensive once a lease drops below 80 years because an extra element called marriage value kicks in. Marriage value represents the increase in the property's value that results from the extension itself, and the freeholder is entitled to 50 percent of it. This can double or more the premium compared with extending from above 80 years.
| Lease Remaining (Years) | Typical Premium (Regional Flat) | Typical Premium (London Flat) |
|---|---|---|
| 90 years | £1,000 to £3,000 | £2,000 to £6,000 |
| 85 years | £2,000 to £5,000 | £4,000 to £10,000 |
| 80 years | £3,500 to £8,000 | £7,000 to £18,000 |
| 75 years | £6,000 to £14,000 | £12,000 to £28,000 |
| 70 years | £9,000 to £20,000 | £18,000 to £40,000 |
| 60 years | £18,000 to £40,000 | £35,000 to £80,000+ |
These figures are illustrative ranges for a standard two-bedroom flat. Premiums vary enormously depending on the exact property value, ground rent terms and local market conditions. You should always commission a surveyor to calculate your specific figure before serving any formal notice.
Surveyor Fees for a Lease Extension
You will need a specialist leasehold valuation surveyor to calculate the correct premium and negotiate on your behalf. This is not optional if you want to avoid overpaying. The freeholder will also instruct their own surveyor, and you are legally required to pay their reasonable valuation fees under the statutory route.
| Surveyor Service | Typical Cost 2026 |
|---|---|
| Your own surveyor (valuation and negotiation) | £700 to £1,500 |
| Your surveyor (complex case or high-value property) | £1,500 to £3,000 |
| Freeholder's surveyor fee (you pay this) | £500 to £1,200 |
| Tribunal appearance fee (if disputed) | £1,500 to £5,000 |
Some surveyors charge a fixed fee; others charge a percentage of the premium or an hourly rate. Fixed fees give you more certainty. Always confirm the fee structure in writing before you appoint anyone. If the premium cannot be agreed and the case goes to the First-tier Tribunal (Property Chamber), costs rise sharply and can make the whole process significantly more expensive.
Solicitor and Legal Fees for a Lease Extension
You need a solicitor who specialises in leasehold law to serve the Section 42 notice, handle negotiations and complete the new lease. Again, you will also be required to pay the freeholder's reasonable legal costs. Freeholder solicitors sometimes inflate their fees, and your solicitor can challenge excessive charges.
- Your solicitor fees: Typically £1,200 to £2,500 for a straightforward case. Complex cases or disputes can reach £3,500 to £6,000 or more.
- Freeholder's solicitor fees (you pay): Usually £1,000 to £2,000 for a standard case. Some freeholders charge more and it is worth asking your solicitor to review their bill.
- Land Registry registration: £20 to £500 depending on property value. Most lease extensions on properties worth £200,000 to £500,000 attract a fee of £95 to £270.
- Stamp Duty Land Tax: Rarely applies to lease extensions but may be payable if the premium exceeds £125,000 or if ground rent terms trigger a charge. Your solicitor will advise.
Total Cost Breakdown: What to Budget All In
Below is a realistic all-in budget for three typical scenarios. These combine the premium plus all professional fees for both sides, Land Registry costs and any incidental expenses. They assume a two-bedroom flat and no tribunal proceedings.
| Scenario | Premium Estimate | Total All-In Cost |
|---|---|---|
| Regional city flat, 85 years left, £180,000 value | £2,500 to £5,000 | £5,500 to £9,500 |
| Outer London flat, 80 years left, £350,000 value | £7,000 to £15,000 | £11,000 to £20,000 |
| Central London flat, 75 years left, £600,000 value | £15,000 to £30,000 | £19,000 to £36,000 |
| Any location, 65 years left (marriage value applies) | £20,000 to £60,000+ | £24,000 to £66,000+ |
Factors That Push the Cost Up or Down
- Years remaining: The single biggest factor. Every year below 80 adds disproportionate cost due to marriage value. Do not let your lease drift below 80 years before acting.
- Property value: Higher value properties attract larger premiums because the freeholder loses more by granting you more time.
- Ground rent: High ground rents (especially doubling clauses) increase the premium because the freeholder is giving up more income.
- Freeholder cooperation: An uncooperative or slow freeholder can drag the process out and increase your legal costs.
- Location: London properties almost always cost more due to higher underlying values and more contentious freeholders.
- Tribunal proceedings: If you cannot agree on the premium and go to tribunal, add at least £3,000 to £10,000 to your costs and several months to the timeline.
The Informal Route: Pros, Cons and Costs
Some leaseholders approach their freeholder directly before serving any formal notice. If the freeholder agrees, you can get a lease extension without going through the full statutory process. This can save time and sometimes money on legal fees, but there are real risks.
Without the statutory protections, the freeholder can insist on a higher premium than the formula would produce, can reintroduce ground rent (which the statutory route eliminates), and can withdraw from negotiations at any point. If you later want to use the statutory route, the two-year ownership clock is still running in the background, so you have not lost that right.
- Potential saving: Legal and surveyor fees can be slightly lower because the process is shorter, saving perhaps £500 to £1,500 in total professional costs.
- Potential risk: Paying an above-market premium or accepting unfavourable terms can cost thousands more than the saving on fees.
- Best for: Properties with longer leases, straightforward freeholders and leaseholders who have good independent valuation advice before entering talks.
How Long Does a Lease Extension Take?
The statutory process typically takes four to twelve months from instructing a solicitor to completing the new lease. The formal timetable gives the freeholder two months to respond to your initial notice, then another two months to respond to your counter-notice. Negotiations on the premium can then take further months, and if the matter goes to tribunal it can stretch to 18 months or more.
If you are in the middle of a sale, the lease extension process can sometimes be run in parallel or the buyer can take over the benefit of the Section 42 notice you have served. This requires careful coordination between solicitors and is common in London where short leases change hands regularly.
Tips to Keep Costs Under Control
- Act early: Extending at 90 years costs a fraction of extending at 75 years. Every year you wait costs you money.
- Get your own surveyor first: Before you serve any notice, instruct a specialist to calculate the likely premium so you know your negotiating position.
- Shop around for solicitors: Leasehold solicitor fees vary. Get two or three quotes and check they specialise in lease extensions specifically.
- Challenge inflated freeholder costs: You can dispute unreasonable freeholder professional fees. Your solicitor should review their bill as a matter of course.
- Consider collective enfranchisement: If you and your neighbours want to buy the freehold together, this can work out cheaper per flat than individual lease extensions and gives you control of the building.
- Check for a share of freehold: If your block already has a residents-owned freehold company, you may be able to extend your lease at much lower cost through the company directly.
A lease extension in the UK costs most leaseholders between £5,000 and £25,000 all in once you add the premium to all professional fees on both sides. The premium is the biggest variable and it rises sharply below 80 years due to marriage value, so acting sooner genuinely saves you money. Always instruct a specialist leasehold surveyor before you commit to anything and budget for the freeholder's reasonable costs on top of your own.