Key Takeaways
- You’ll generally find that a £500,000 property with a 75-year lease will have a lease extension premium close to twice that of a £250,000 flat – and both of these properties would have otherwise been pretty much identical.
- The freeholder’s reversion and any marriage value are both calculated as a percentage of what your flat is worth on the open market right now – not what you stumped up for it all those years ago.
- Once your lease falls below 80 years, marriage value can add thousands to the premium, especially for higher-value properties. And that number can add up fast where you’re buying a more expensive flat.
- Extending your lease is generally going to add around 10% or more to your property value – so it’s often better to think of the premium as a savvy investment rather than just a one-off hit to the wallet.
- This article comes with a handy table to help give you a rough idea of how property value and lease length affect what you’ll need to pay.
Introduction: Why Property Value Really is the Key to How Much You’ll Pay for a Lease Extension
The number one thing that determines how much you’ll have to pay for a lease extension is what your flat is actually worth on the open market today – not what you paid for it five years ago, or what someone else might have paid for a similar place down the road – the actual current value right now.
Think of it like this: a £250,000 flat in Leeds with 82 years left on the lease is likely to cost less to extend than a £500,000 flat in South London with the same lease length. And that’s not hard to understand when you think that the premium for a lease extension is all about property value and lease length – and that relationship underpins the whole calculation.
Your lease extension premium is the big lump sum you’ll pay your freeholder to extend your lease and reduce the ground rent – and that’s separate from the other costs you’ll incur, like getting a valuation and paying legal fees. The price you’ll pay for a lease extension can range all the way from £6,000 for a low-value place to £12,000 and beyond – and this article focuses on that process in England and Wales and how it’s changed for leasehold reform.
How Lease Extensions Really Do Affect Your Property Value
Extending your lease usually does bump up the value of your flat – and it can make it a whole lot more attractive to lenders as well. In fact, getting a lease extension can boost your flat’s value by at least 10% – and sometimes a lot more if your lease is really short. Where you happen to live is obviously a major factor in what your flat will be worth, but lease length is one thing you can control.
Take a flat with a 70-year lease as an example – it might sell for 10-20% less than a similar flat in the same block with 120 years or more left on the lease – we’re talking £330,000 instead of £400,000. A short lease can really make it harder to sell your place, and lenders get a bit nervous around 80 years, more so at 70 and 60 years – some of them want to see a lease extension process underway before the sale is even complete. The difference in value between a short lease and a long lease – that’s the bit that drives any marriage value payable to the freeholder. Which is why it’s worth thinking of the premium as an investment that will likely be recouped when you come to sell.
The Three Main Parts of a Lease Extension Premium
So how does all this work in terms of how much you’ll pay? Well, under the 1993 Act, premiums are broken down into three bits: reversion, ground rent, and (if there is one) marriage value. Statutory lease extensions will give you 90 extra years and zero ground rent from now on – and a Section 42 Notice is the thing that gets the whole process underway. Surveyors use specialist valuation software to work it all out, but to simplify things, each part of the premium is linked to the current market value of your flat and the current ground rent you pay.
Reversion: What the Freeholder Gets to Keep
Reversion is the value of the freeholder’s right to take back your flat when the lease runs out – and that’s worth something, after all! When you extend your lease, you’re effectively buying out that future right and pushing it far into the future. The valuation people use methods and value drivers to work out the numbers – starting with your flat’s current market value (say £300,000) and then working out what that would be worth at the end of the original lease term, then discounting that back to today, normally at a 4-5% rate.
The upshot is that a £600,000 flat will likely have roughly double the reversion element of a £300,000 flat with the same number of years left on the lease and same market assumptions. And it’s clear that the shorter your lease is, the more valuable that reversion becomes – because the freeholder is that much closer to getting the property back.
Ground Rent: Buying Out an Income Stream
Ground rent is the annual rent you pay under your current lease – say £200 a year, which doubles every 25 years. A statutory lease extension will knock ground rent to zero – and the freeholder is compensated for losing that income stream. The valuation people work out how much future ground rent payments are worth over the remaining term, and then convert that into a lump sum – often using a capitalisation rate of 6-7%.A flat that costs £250 a year and has 75 years left on its lease will actually cost the freeholder a whole lot more to lose than one that costs just £50 a year. And that’s all things being equal. The reforms that have been introduced are capping ground rent for valuation purposes at 0.1% of the freehold value which – for those with older, escalating ground rent arrangements – may just reduce this cost component for some leaseholders.
Marriage Value – Sharing the Increase In Property Value
Marriage value is what happens when you ‘marry’ a short lease with a new lease -and that’s usually when the unexpired term drops below 80 years. A lease under 80 years will incur a marriage value fee. Under the rules as they stand, leaseholders generally end up paying 50% of that increase to the freeholder.
Here’s an example to make it a bit clearer: a flat worth £400,000 long-lease value, but a short-lease value of £340,000 would see a £60,000 windfall. The marriage value payable to the freeholder would be roughly £30,000, on top of reversion and ground rent costs. And because both the short-lease and long-lease figures are tied to the overall property price, the marriage value on a £700,000 flat is going to be a lot higher than on a £220,000 flat. Extending a lease under 80 years is going to cost a Marriage Fee that’s directly proportional to how much value the property holds.
How Property Value Effects Your Premium – Side-By-Side Examples
To make this more concrete, take two flats, both with 78-year leases and a £200 per year ground rent. One is worth £250,000, the other is worth £500,000. As you’d expect, the premium payable on the more expensive flat comes in at roughly twice the cost. The Comparable Sales method is better suited for residential properties, and valuers adjust the comparable property prices to take into account differences in characteristics, but the relationship to the value is always there.
Outside of London, a £180,000 Manchester flat with 83 years left compared to a £350,000 Bristol flat with 83 years left shows the same scale. The Sales Comparison method is used to adjust property value based on the sale prices of comparable properties. Property value isn’t the only thing that comes into play – lease length, ground rent pattern, and timing can all affect the premium, but value remains the primary driver.
Your Simple “Premium Table” – A Human-Friendly Lease Extension Calculator
This table is a bit like a mini lease extension calculator – providing a realistic range of costs rather than a precise quote. It assumes a standard ground rent of about £200 per year, average city conditions, and flats in England and Wales in 2026. To get a proper lease extension figure, you’d need to do a full calculation based on exact lease terms, location, and market evidence. Surveyors tend to use three main approaches to property valuation – market, income, and cost – and then blend those with specific lease data to come up with a proper valuation.
| Property Value | 85 Years | 80 Years | 75 Years | 65 Years |
| £200,000 | £5,000–£9,000 | £10,000–£15,000 | £14,000–£22,000 | £25,000–£40,000 |
| £300,000 | £8,000–£12,000 | £15,000–£25,000 | £20,000–£35,000 | £38,000–£55,000 |
| £500,000 | £15,000–£25,000 | £25,000–£50,000 | £35,000–£60,000 | £60,000–£90,000 |
| £750,000 | £22,000–£38,000 | £38,000–£75,000 | £50,000–£90,000 | £85,000–£130,000+ |
Sourced from Websters Surveyors, Homeward Legal, MoneySavingExpert – these ranges are only a rough guide.
Use this as a rough idea of the figure involved, and then get a proper valuation for your specific property and address. For those looking to get a quick estimate, a lease extension calculator can be a helpful starting point to understand potential costs before seeking professional advice: calculate lease extension
Timing Your Lease Extension: Why 80 Years is a Critical Line
Lease lengths below 80 years sees a significant jump in extension costs because marriage value comes into play. A flat worth £400,000 with 81 years left on it might cost £10,000 to £18,000 to extend. Let it drop to 79 years, and that range could jump up to £20,000 to £35,000 or more. The value of the property just makes it worse – a £700,000 flat crossing that threshold could see the extension price jump by tens of thousands.The lease extension process can take anywhere from 3 to 6 months to complete, so if your lease is nearing its low 80s, take a look at the title deed and check your exact date of ownership then consider getting started early. You don’t have to have owned the property for over two years to get a statutory extension – although recent reforms mean this rule won’t kick back in until 31 January 2025. Market trends can really impact property values so you’ll need to factor those into any valuations you get done. Meanwhile the Leasehold and Freehold Reform Act 2024 has got plans to abolish ‘marriage value’ in lease extensions but for now – until some secondary legislation actually kicks in – the 80-year rule is a serious thing to consider if you’re thinking about extending your lease.
Other Factors That Impact What You’ll Need to Pay
Property value is the biggest driver of the cost, but it’s not the only thing that matters. If the ground rent is shooting up fast – doubling every 10 – 15 years is not unheard of – that alone can make a big difference to what you have to pay. Market conditions are also a big influence on what property is worth – supply and demand and all that. Interest rates can also affect how much you can borrow to pay for the lease extension and what your mortgage repayments will be. Legal fees can add another £1,500 – £2,000 to the cost on top of the premium you pay.
The age and condition of the property, how big it is and how usable it is all count towards its market value. And of course local zoning laws and the potential for development in your area all make a difference too. If you’ve done some repairs – like fitted a new kitchen for example – these are usually not taken into account when valuing the property, but you’ll need to get some professional advice to see if there are any grey areas. In any case, get all the facts straight – like the lease length, ground rent pattern and landlord details from HM Land Registry. These documents will underpin any discussions about the premium you’ll need to pay. The statutory route may be quicker, but the freeholder can then propose a higher premium or higher ongoing ground rent, so make sure to get a valuation done using the statutory formula first. Then you can use that to negotiate a deal.
Frequently Asked Questions
Below are some common questions that crop up when leaseholders are trying to get to grips with how much is at stake and what to do next.
How do I get a rough idea of how much my property is worth before plunging into a lease extension?
Start by looking at what similar houses have sold for in your street, or in the same building. You can get an online estimate from the property portals, or check out the sold prices on HM Land Registry’s data – these give a bit more clout than asking prices. A local estate agent can give you a rough figure based on recent local sales, and a local agent usually knows the area inside out. But if the premium is likely to be quite high, it’s worth getting a chartered surveyor in to do a proper valuation. A mortgage valuation will give you an idea of the value, but it’s not a substitute for a dedicated lease extension valuation – that one needs to take account of the existing lease length and ground rent terms, not the value of the place with an extended lease. Property valuation is a tricky business – it involves looking at market trends and crunching some numbers.
What happens to my premium if property prices in the area drop?
Because both the reversion and marriage value bits of the calculation are based on the capital value of the property, a falling market can actually bring the premium down compared to highs seen in boom times. Timing the lease extension to coincide with a softer market can even save you some cash. However, surveyors will still look at the relative value of short and long leases, not just the headline prices. And if you wait too long and the lease drops below 80 years, you could end up with no savings at all – the marriage value bit might actually be higher than any savings you make from a dip in prices. So just keep an eye on both the market direction, and the lease length milestones, before deciding when to do the deal.
Can I just remortgage or sell my flat to cover the lease extension premium?
Many people agree the premium upfront and then use the higher value of the place after the extension to get a bigger mortgage. Some lenders will let you borrow more to cover the premium and fees, or you might be able to sell up and assign the benefit to the buyer who pays the premium on completion. Lenders tend to prefer leases with at least 80-85 years left on them at the date of remortgaging, so starting the extension early will give you more options. Get a mortgage broker and solicitor on the case early so funding, timing and legal steps all line up right. And once you’ve got the new lease, register the deed with HM Land Registry to complete the purchase of those extra years.
Do I always have to use the statutory route, or can I just try and negotiate a deal directly with the freeholder?
Most flat owners in England & Wales who have owned their leasehold property for a while – & meet the bare minimum criteria – have a right to a statutory lease extension, but you might also want to have a look at making an informal deal with your freeholder. Informal deals can be a bit more flexible, but what often happens is the freeholder comes back with a higher price or worse ground rent terms, so you won’t always end up getting the better deal. A lot of leaseholders take valuation advice first by plugging their details into the statutory formula and then use that as a benchmark to negotiate from.
Whatever route you choose to go down, the influence of property value on the premium is more or less the same. Before you do anything, it’s worth having a chat with a solicitor who can give you the straight facts and some proper advice – and that’s before you start talking to your freeholder about moving things forward.
Is the premium I pay fixed forever once agreed ?
Once you and your freeholder have come to an agreement – whether it’s a formal contract or a tribunal’s ruling – then the figure you come up with is set in stone for that particular extension. It won’t change even if property prices rise or fall later on. However, getting on with it is important : if the market moves or the lease length gets to a critical point while you’re negotiating, the freeholders valuer may have to come back with a new estimate based on fresh data and sales evidence. Having an experienced valuer and solicitor on board and dealing with things promptly will keep the premium where it needs to be. The Cost approach estimates property value by looking at how much it would cost to replace it, minus all the depreciation that’s happened over time and is sometimes referenced in tricky valuations. Any future extension decades later will be done again fresh, taking everything into account at the time and following the rules in place then.
Professional Guidance
The lease extension process involves complex legal and valuation requirements that can significantly impact the final premium you pay. It is highly recommended that you consult with a London lease extension specialist solicitor to ensure you have expert support and guidance throughout every stage of the transaction. Professional legal advice will help protect your interests, navigate the statutory requirements of the 1993 Act, and ensure that all documentation is correctly registered with HM Land Registry.