How Shared Ownership Staircasing Works in 2026 — A Complete Guide

What Is Staircasing?

Staircasing is the mechanism that allows shared ownership buyers to gradually increase — or "staircase" — their ownership share in their home. When you first buy a shared ownership property, you typically purchase a share of between 10% and 75% of its full market value. Over time, you have the right to buy additional shares until you own 100% of the property outright.

The process is governed by the terms of your lease, which will specify the minimum tranche size, any restrictions on timing, and the procedure you must follow. Understanding those terms before you staircase is essential.

How the Process Works Step by Step

**Step 1 — Notify your housing association.** Before you do anything, write to your housing association (also called the registered provider) to confirm your intention to staircase. Your lease will specify a notice period — typically 28 days — and the housing association may have its own forms.

**Step 2 — Obtain an independent RICS valuation.** The price you pay for your additional shares is always calculated as a percentage of the current open market value of the whole property — not the price you originally paid. You must instruct a RICS-qualified surveyor to carry out a formal valuation. The housing association will usually provide a list of approved valuers, or you can instruct your own (subject to the housing association's approval). Valuations are typically valid for three months.

**Step 3 — Agree the share you wish to purchase.** Once you have a valuation, decide how many additional percentage points you want to buy. The cost of your additional shares is calculated by multiplying the current full market value by the percentage you are buying. For example, if the property is valued at £300,000 and you want to buy an additional 10%, the cost of those shares is £30,000.

**Step 4 — Arrange your mortgage or cash funding.** Most buyers fund their additional shares through a mortgage — either by remortgaging their existing shared ownership mortgage onto the larger equity stake, or by taking a separate loan. You will need a mortgage offer in place before you can exchange contracts.

**Step 5 — Instruct a solicitor.** Staircasing is a legal transaction that requires a solicitor. The housing association will also instruct solicitors. Your solicitor will review the lease, check for any outstanding charges or service-charge arrears, and handle the title transfer.

**Step 6 — Exchange and complete.** Once searches and legal checks are done, contracts are exchanged and a completion date is set. On completion, the housing association transfers the additional shares to you. Your lease is amended to record your new ownership percentage, and your monthly rent is recalculated accordingly.

What Happens at 100% Ownership?

When you staircase to 100%, the property typically converts from a leasehold interest with a monthly rent to either a full freehold (if a house) or a leasehold without a rent obligation (if a flat). At this point, you become solely responsible for all maintenance and repairs — the housing association no longer has any obligation to contribute even to major structural works.

Using the Shared Ownership Calculator

Before you decide how many shares to buy, it is worth modelling the numbers carefully. Our [Shared Ownership Calculator](/shared-ownership-calculator) lets you input your current share, the property value, mortgage rate, and target share to see how your monthly costs — mortgage payments plus reduced rent — will change after staircasing. Run the numbers before you instruct a solicitor or valuations, because the costs of an aborted staircase can still mount up.

Common Mistakes to Avoid

• **Waiting too long for a valuation.** Valuations are only valid for three months. If you delay instructing solicitors, you may need to pay for a second valuation.
• **Underestimating legal fees.** Two sets of solicitors are involved, and housing association legal costs (which you typically must pay) can be significant.
• **Not checking for service-charge arrears.** Outstanding service charges or major works invoices can delay or block completion.
• **Ignoring the impact on benefits.** Owning a higher share increases your equity and may affect your eligibility for certain benefits or means-tested support.

Staircasing is one of the most financially significant decisions a shared ownership buyer will make. Prepare thoroughly, and use our calculator to model different scenarios before committing.