Shared Ownership Lease Extensions: Your Rights, Costs and When to Staircase

Shared ownership makes buying a home more affordable by reducing the deposit and mortgage you need. But it does not necessarily make a lease extension cheaper. You could own 10% of your home and still be asked to pay 100% of the extension premium, plus both sides’ professional fees.

The video explains three connected questions: what share do you own, which extension route can you use, and how much of the added value will you keep? The housing association tables below help with the price, but you need the whole picture before deciding whether to extend or staircase first.

Your share, your lease and your right to extend

You own a share of the leasehold interest and pay rent on the share you have not bought. Buying more shares is called staircasing. It increases your ownership percentage, but does not by itself stop the lease getting shorter. Buying 100% of a flat also does not mean you have bought its freehold.

For the flat leases discussed in the video, reaching 100% ownership is the dividing line between two routes:

• At 100% ownership, you can use the statutory lease extension route, subject to the usual eligibility requirements. A Section 42 notice starts a legally protected process: the landlord cannot simply refuse, the valuation follows the statutory rules, and disputes can go to the tribunal. Serving a valid notice fixes the valuation date. The extended lease has a peppercorn (effectively zero) ground rent.
• Below 100% ownership, you currently rely on an informal or voluntary extension. Your housing association decides whether to offer one and on what terms. There is no statutory timetable or equivalent tribunal backstop for settling the extension terms. Rent on the share you have not bought continues: that is distinct from ground rent.

If you have already staircased to 100%, find your Memorandum of Staircasing before starting. The video highlights that these documents are not necessarily registered at HM Land Registry, so the register alone may not establish your final share. Your solicitor will need the paperwork proving full ownership. If you bought at 100%, check your original purchase documents instead.

Check whether your lease lets you reach 100% at all. Some older persons’ shared ownership schemes cap staircasing below full ownership, so “staircase first” is not an available solution for everyone.

Budget for three separate costs

1. The lease extension premium

This is the price paid for the longer lease. At 100% ownership, you pay the full premium and keep the full increase in the flat’s value. Below 100%, the housing association’s policy decides whether you pay a proportionate premium or the whole amount.

In the video, an East London leaseholder owned 40% of a flat with fewer than 80 years remaining. The full premium was over £50,000. A proportionate charge would have been around £20,000: a difference of roughly £30,000 depending on the housing association’s policy, before professional fees.

2. Your own solicitor and valuer

You need legal advice on the new lease and valuation advice on the premium. They are different jobs. For an informal extension, your mortgage lender may also need to approve the new lease and a Deed of Substituted Security, which transfers its security to that lease.

Delays matter, especially with hourly legal fees. The video describes informal extensions taking up to 18 months, with repeated chasing adding to the bill. Ask what your quote includes and how delays or extra lender work will be charged.

3. The housing association’s fees

Do not assume a share-based premium means share-based fees. You can still be required to pay all the housing association’s legal and valuation costs, even where you own only a small share. Confirm any exceptions in its policy.

Under the statutory route, recoverable landlord costs must be reasonable, with limits on what can be charged. The informal route does not offer the same statutory cost protections. You may be asked to pay fees upfront before you know whether the eventual premium is affordable. Ask what is payable if the extension does not proceed.

Paying for the extension does not buy you a bigger share

This is the other half of the calculation. The value uplift is shared according to ownership, even if the bill is not.

Suppose you own 50% and extending the lease adds £20,000 to the value of the whole flat. Your share gains £10,000 in value, and the housing association’s share gains £10,000. That does not change just because you paid the entire premium or all the professional fees. The £10,000 uplift in your share is not a profit figure: you still need to deduct what you spent.

There is a further consequence if you plan to staircase later. A longer lease can increase the value used to price the remaining shares, making those shares more expensive to buy. Compare the combined cost of staircasing then extending with extending then staircasing, rather than looking at the extension quote in isolation.

Should you staircase or extend first?

The video’s starting point is your ownership percentage and the years left on your lease:

• Own 100%, with more than 90 years left? You have more breathing room to plan a standard statutory extension.
• Own 100%, with 80–90 years left? Plan early enough to act before the 80-year threshold. Under the rules discussed in the video, marriage value becomes payable at 80 years or less and can make the premium substantially higher.
• Own less than 100%? Explore whether reaching 100% first is possible and affordable. It can unlock the statutory route and let you keep the full benefit of the extension. But allow for the time needed to staircase: do not let a lease approaching 80 years drift while you investigate.
• Already below 80 years? Compare your options using actual valuations. Staircasing does not remove marriage value, and waiting for reform is a gamble rather than a guaranteed saving.

The video discusses reforms in the Leasehold and Freehold Reform Act 2024, including shared owners’ extension rights and marriage value. Those changes were not in force when the video was recorded. Check the current position with your solicitor rather than treating a proposed reform as an available route.

Before paying for a valuation, ask your housing association to confirm in writing: whether it will extend, how it apportions the premium, the new lease length and rent terms, all fees, and whether its own freehold or head lease restricts what it can offer. The comparison below is a starting point, not a quote for your particular lease.