Guide · 5 minute read · Updated 10 Jul 2026

Shared ownership explained: is it worth it?

You buy a share of a home, usually 25% to 75%, take a mortgage on that share, and pay subsidised rent on the rest. It lowers the deposit and income you need to get in, but the ongoing costs and resale rules are where it either works for you or quietly does not.

How the money actually splits

Shared ownership lets you buy a slice of a property from a housing association rather than the whole thing. The older model sets the minimum share at 25%; homes built under the 2021 to 2026 Affordable Homes Programme let you start from as little as 10%. The maximum initial share is 75%.

Say a flat is valued at £300,000 and you buy a 40% share for £120,000. With a 10% deposit you need £12,000 in cash and a mortgage of £108,000, instead of a £30,000 deposit and a £270,000 mortgage to buy outright. On the other 60% you pay rent to the housing association, typically charged at up to 2.75% of the landlord's share per year. Here that is 2.75% of £180,000, about £4,950 a year or £412 a month, on top of your mortgage. Run the share size through the mortgage affordability calculator to see what the deposit and repayment look like at each level.

Staircasing: buying more of your own home

Owning more over time is called staircasing. You pay the housing association for extra shares at the current market value, so if prices rise, later shares cost more. Homes under the newer model let you staircase in 1% steps for the first 15 years with no admin fee each time; older leases usually require larger chunks, often 10% at a time, with a valuation fee and legal costs on each move.

Staircasing to 100% ends the rent and, on a house, often the leasehold too. The catch is that market-value pricing means you are chasing a moving target: on a home that has risen 5% a year, the share you could not afford at the start only gets more expensive.

Leasehold, service charges and the running costs

Almost all shared ownership homes are leasehold, even the houses, so you also pay a service charge and, on some older leases, ground rent. The service charge covers building maintenance, and you pay the full amount, not a slice scaled to your share: a 25% owner and a 75% owner in the same block pay the same service charge. On new grant-funded homes the landlord now contributes to some repair costs for the first 10 years, which softened the old rule where owners paid 100% of everything.

Budget realistically. A £200 to £300 monthly service charge on a flat is common, and it can rise. Add mortgage, rent and service charge together before deciding this is cheaper than renting the same place outright.

The resale catch

When you sell, the housing association usually has a nomination period, now four weeks under the new model, during which it can find a buyer before you go to the open market. You can only sell the share you own, the buyer must qualify for shared ownership, and if you own less than 100% the sale price is set by an independent valuation, not by what you hope to get.

Shared ownership replaced Help to Buy as the main route in for buyers who cannot raise a full deposit, and for the right person it genuinely works: it gets you a stake, some price exposure and stability sooner. It suits you least if you expect to move within a few years or want full control over the property, because the rent, the charges and the resale friction all eat into the gain.

Common questions

What is the minimum share I can buy in shared ownership?

On the older model the minimum is 25%, up to a maximum initial share of 75%. Homes built under the 2021 to 2026 Affordable Homes Programme let you start from 10%. You take a mortgage on the share you buy and pay rent on the part the housing association still owns.

Do I pay the full service charge or just my share?

The full amount. Service charges in shared ownership are not scaled to the size of your share, so a 25% owner pays the same charge as a 75% owner in the same block. Budget £200 to £300 a month on many flats, on top of mortgage and rent.

What does staircasing cost?

You buy extra shares at the current market value, so rising prices make later shares more expensive. Newer leases allow 1% steps for the first 15 years with no admin fee; older ones often need 10% chunks plus a valuation and legal fees each time. Reaching 100% ends the rent.

Can I sell a shared ownership home whenever I want?

Yes, but with friction. The housing association usually gets a nomination period, four weeks under the new model, to find a buyer first, the buyer must qualify for shared ownership, and if you own under 100% the price is set by an independent valuation rather than the open market.

Guidance and education, not regulated financial advice.