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MortgageMetrics

Shared ownership calculator

See the deposit you'd need and the full monthly cost of a shared ownership home: mortgage, rent and service charge. Compare it with buying on the open market.

Free, no sign-up Last reviewed 3 October 2026

Your details

Usually 10% to 75% for new homes in England.

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At least 5% of the share price.

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Shared ownership mortgage rates can be a little higher.

Including any ground rent or estate charges.

How shared ownership works

You buy a share of a home, usually from a housing association, and pay rent on the rest. Your mortgage and deposit are based only on the share you buy, which makes it easier to get onto the ladder with a smaller deposit and income. Homes are almost always leasehold.

To qualify in England your household income must usually be £80,000 or less (£90,000 in London), and you can't own another home. Other UK nations run their own schemes. See government schemes.

Costs to budget for

  • Rent increases: usually once a year, linked to inflation. Your mortgage payment doesn't fall when rent goes up.
  • Service charge: you pay 100% of it, whatever share you own. Ask for the last three years' charges and any planned major works.
  • Staircasing: each purchase needs a RICS valuation and legal work. Some newer leases allow buying 1% a year at a reduced cost.
  • Selling: the housing association usually has first refusal to find a buyer for your share.

Assumptions

  • A repayment mortgage at one rate for the whole term.
  • Rent and service charge are shown at today's level and will usually rise each year.
  • Stamp duty, legal fees and other purchase costs aren't included. Use the cost of buying calculator for those.

Get advice from an FCA-authorised mortgage broker

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Frequently asked questions

How much rent do you pay on shared ownership?

Rent is set as a percentage of the value of the share you don't own. For new homes in England it's usually 2.75% a year at the start, and it normally rises each April in line with inflation plus a margin. Check your lease for the exact formula.

What is staircasing?

Staircasing means buying more shares in your home, reducing the rent you pay. Each share is priced at the home's market value at the time, so if prices rise, buying more costs more. You'll need a valuation and legal work each time.

Who pays for repairs on a shared ownership home?

Usually you do, even though you only own part of the home. Under the newer model in England, landlords cover some essential repairs for the first 10 years of a new-build home. You also pay the full service charge.

Do I pay stamp duty on shared ownership?

You can choose to pay stamp duty on the full market value upfront, or only on the share you buy and then again when you staircase past 80%. First-time buyer relief can apply. A solicitor can tell you which is better for you.

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