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Shared ownership calculator
Buy a share of a home and pay rent on the rest. See the deposit, the mortgage, the rent, and how it compares with buying the whole home. For England's scheme. Checked 2026-10-04.
Buying a 25% share of a £300,000 home costs a £7,500 deposit and about £858 a month: £342 mortgage and £516 rent.
Each month, all in
£858
- Mortgage on £67,500
- £342
- Rent on the 75% you don't own
- £516
- Your 25% share
- £75,000
- Deposit
- £7,500
Buying all of it with the same deposit: £1,482 a month on a £292,500 mortgage.
Buying another 10% later would cost about £30,000 at today's value, and cut the rent by £69 a month.
Rent at 2.75% a year, which usually rises each year. Mortgage at the usual rate on First Key. A guide: the housing association confirms the real figures.
How shared ownership works
- How it works
- You buy a share of a home, from 10% to 75%, with a mortgage and deposit for that share. You pay rent to a housing association on the rest.
- Who can buy
- First-time buyers, or people who used to own a home and can't afford to buy now, with a household income of £80,000 or less (£90,000 in London).
- The rent
- Usually up to 2.75% a year of the value of the part you don't own. It normally rises each year, often by inflation plus a little.
- Buying more
- You can buy more of your home later, called staircasing, in steps as small as 1% for the first 15 years. The price is set by a new valuation, so it goes up if the home's value has.
- It's leasehold
- Shared ownership homes are leasehold, so check the lease length, the service charge and who pays for repairs. New homes come with 10 years of help with essential repairs.
- Outside England
- Scotland, Wales and Northern Ireland have their own schemes with different rules. This calculator uses England's.
Common questions
- How much deposit do I need for shared ownership?
- Usually 5% to 10% of your share, not of the whole price. For a 25% share of a £300,000 home, 10% is £7,500, against £30,000 to buy it all.
- Is shared ownership cheaper than buying outright?
- Each month it can be, because the mortgage is smaller. With the same £7,500 deposit, buying all of a £300,000 home would mean a £1,482 monthly mortgage, against £858 for a 25% share with rent. But the rent rises each year, and you only own your share.
- How is the rent worked out?
- Usually 2.75% a year of the value of the part you don't own. On a 75% unowned part of a £300,000 home, that's £516 a month.
- What does it cost to buy more?
- Each extra share is priced at the home's value when you buy it. Another 10% of a £300,000 home would cost £30,000 and cut the rent by about £69 a month. There are valuation and legal fees too.
- Can I sell a shared ownership home?
- Yes. The housing association usually gets a few weeks to find a buyer first. You get your share of the sale price at the time, whether the value has gone up or down.
- Do I pay stamp duty on shared ownership?
- You can choose to pay it on your share only, or on the full value at the start. First-time buyer relief can apply. Ask your solicitor which suits you.
Thinking of buying the whole home instead? The mortgage calculator and the costs calculator show what that would take.
A guide, not financial advice or a promise that you could buy. The housing association and a lender decide. Shared ownership on GOV.UK. Where our numbers come from.