How Much Does a Leasehold Extension Cost?
The cost of extending a leasehold property varies enormously, but most leaseholders in England and Wales pay a total of £5,000 to £30,000 — covering the premium paid to the freeholder, plus professional and legal fees. Flats in central London can cost significantly more.
The premium (the amount paid to the freeholder) is the biggest variable. It's calculated using a statutory formula under the Leasehold Reform, Housing and Urban Development Act 1993 and depends on your property value, ground rent, and — critically — how many years are left on the lease.
⚠️ Act fast if your lease has under 80 years: When a lease drops below 80 years, the "marriage value" component kicks in, potentially doubling the premium cost. Every year you delay costs more — and properties with leases under 80 years become increasingly difficult to sell or remortgage.
Free Leasehold Extension Premium Estimator
This calculator provides an indicative estimate. For a formal valuation, you must instruct an RICS Registered Valuer — the freeholder will also instruct their own valuer, and you will typically pay their fees too.
🏢 Estimate Your Leasehold Extension Cost
Leasehold Extension Costs Breakdown
| Cost Component | Who Pays? | Typical Cost |
|---|---|---|
| Premium (to freeholder) | Leaseholder | £3,000 – £25,000+ |
| Leaseholder's valuation | Leaseholder | £700 – £2,000 |
| Leaseholder's legal fees | Leaseholder | £1,200 – £3,000 |
| Freeholder's valuation fees | Leaseholder (statutory) | £500 – £1,500 |
| Freeholder's legal fees | Leaseholder (statutory) | £800 – £2,500 |
| Land Registry fee | Leaseholder | £20 – £540 |
| Stamp Duty (if premium over £250k) | Leaseholder | Varies |
Total typical cost range: £5,000 – £35,000 (premium + all professional fees)
How Is the Leasehold Extension Premium Calculated?
The statutory premium has three components:
- Loss of ground rent: The present value of the ground rent income the freeholder loses for the extended term.
- Reversion value: The present value of the freeholder's right to regain the property at the end of the current lease term.
- Marriage value: Applies only when the lease has fewer than 80 years remaining. This is typically the most expensive component — it splits the increase in property value resulting from the extension equally between leaseholder and freeholder (50/50).
How Many Years Can I Extend My Lease?
Under the Leasehold Reform, Housing and Urban Development Act 1993 (and the Leasehold and Freehold Reform Act 2024, currently being implemented), qualifying leaseholders in England and Wales have a statutory right to extend their lease by:
- Current law: 90 additional years (on top of the unexpired term), at a peppercorn (zero) ground rent
- Under 2024 Reform Act (when fully enacted): Extended to 990 years at zero ground rent
You can also agree an informal extension directly with your freeholder — this may be faster and cheaper, but you lose statutory protections and the freeholder can set their own terms.
Who Qualifies to Extend Their Lease?
To qualify for a statutory leasehold extension in England and Wales, you must:
- Have owned the leasehold for at least 2 years
- Have a long lease (originally granted for more than 21 years)
- Own a flat or maisonette (houses have different rights under the 1967 Act)
- Not be a commercial lease
Step-by-Step: How to Extend Your Lease
- Check eligibility — confirm you've owned the property for 2+ years and have a qualifying lease.
- Instruct an RICS Registered Valuer — they will value your property and calculate the likely premium range.
- Instruct a leasehold specialist solicitor — not all conveyancers handle lease extensions; use a specialist.
- Serve a Section 42 Notice — your solicitor serves formal notice on the freeholder, proposing a premium.
- Freeholder responds — the freeholder has 2 months to respond with a Section 45 Counter-Notice, usually proposing a higher premium.
- Negotiate — typically 3–6 months of negotiation between the parties' valuers and solicitors.
- If no agreement — either party can apply to the First-tier Tribunal (Property Chamber) for a determination. This adds 3–12 months and further costs.
- Completion — once agreed, the new lease is drafted and registered at the Land Registry.
Typical timescale: 6–18 months from Section 42 Notice to new lease registered.
Should I Extend My Lease Before Selling?
Generally yes — especially if your lease has fewer than 80 years remaining. Here's why:
- Properties with leases under 80 years are much harder to sell, as many mortgage lenders won't lend on them
- Properties with leases under 70 years may be unmortgageable entirely
- Extending before listing can add more to the sale price than the extension costs
- However, if you've owned the property for under 2 years, you cannot serve a Section 42 Notice — you'd need to sell with a shorter lease and factor in the cost
💡 Tip: If you're buying a flat with a lease of 82–90 years, negotiate a discount on the purchase price reflecting the extension cost — then extend immediately after the 2-year qualifying period. Or ask the seller to serve a Section 42 Notice before exchange and assign the benefit of the notice to you at completion.