How shared ownership works
Shared ownership (sometimes called part-buy, part-rent) is a government-backed scheme run through housing associations and a small number of local authorities. You buy a share of a property using a mortgage and deposit on that share, and pay subsidised rent to the housing association on the share you do not own. The combined monthly outgoing is typically lower than buying outright on the open market, and the upfront cash requirement is much smaller.
Because you only buy part of the home, the cash needed upfront is far smaller. For example, a 25% share of a £300,000 home costs £75,000, so a 10% deposit on that share is just £7,500, compared with £30,000 for a 10% deposit on the whole home. A 5% deposit on the same share would be £3,750, which is genuinely achievable for many households who earn too little to save larger sums quickly.
The scheme is primarily delivered in England through Homes England and in London through the Greater London Authority. Wales, Scotland and Northern Ireland have similar but distinct arrangements, so the eligibility rules and property availability differ if you are searching outside England.
Shared-ownership homes are nearly always leasehold, meaning you own the property for a fixed term (typically 99 to 125 years, sometimes 990 years on newer builds) rather than the land beneath it. As with any leasehold property, you pay a service charge and, on some older leases, a ground rent. Understanding leasehold obligations before you commit is important.
Full monthly cost breakdown: illustrative example
This example assumes a 25% share of a £300,000 property (share value £75,000), a 10% deposit (£7,500), a repayment mortgage of £67,500 at 5% over 25 years, and a rent rate of 2.75% on the unowned 75% share (£225,000). Service charges vary widely but £150 to £250 per month is common in England.
| Cost element | Approx. monthly amount | Notes |
|---|---|---|
| Mortgage repayment | £395 | On the £67,500 borrowed at 5%, 25-year term |
| Rent on unowned share | £516 | 2.75% of £225,000 divided by 12 |
| Service charge | £175 | Typical range is £100-£350 depending on the development |
| Buildings insurance contribution | Often included in service charge | Check your lease |
| Ground rent (older leases only) | £0-£150 | Largely abolished for new leases from 2022 |
| Total indicative monthly cost | ~£1,086 | Versus ~£1,754/month mortgage on the full £270,000 at 5% |
Figures are illustrative. Your actual rent, service charge and mortgage rate will differ. Always request a full cost illustration from the housing association before applying.
Eligibility: who can apply?
Shared ownership is aimed at people who cannot afford to buy a suitable home outright on the open market. The rules are set nationally but administered by individual housing associations, who may apply additional local criteria.
The household income cap is £80,000 per year outside London and £90,000 in London. These figures apply to your total household income, including a partner's earnings if you are buying jointly. The cap is gross (before tax).
You must be a first-time buyer, a former homeowner who can no longer afford to buy (for example, after a relationship breakdown), or an existing shared-ownership tenant looking to move. People with a disability may also qualify for the Older People's Shared Ownership scheme (for those aged 55 and over) or the Home Ownership for People with Long-Term Disabilities (HOLD) scheme.
You must demonstrate that you cannot afford a suitable home outright on the open market where you want to live, and you must pass the lender's affordability and credit checks on the mortgage for your share. Specialist shared-ownership mortgage products exist from a range of lenders, and a broker familiar with the scheme can be invaluable in finding the most competitive deal.
How to buy a shared-ownership home: step by step
Register with a Help to Buy agent or housing association
In England, register your interest through Homes England or directly with housing associations in your target area. Share to Buy is a useful aggregator of available properties.
Check eligibility and affordability
Confirm you meet the income cap and residency requirements. Work out the full monthly cost (mortgage, rent and service charge combined) and compare it with your take-home pay.
Reserve a property
When you find a suitable home, pay a reservation fee (typically £200 to £500, refundable if the housing association withdraws). The housing association will carry out financial checks.
Arrange a mortgage
Apply for a shared-ownership mortgage. Not all lenders offer them, so use a broker who specialises in the scheme. You will need a deposit of at least 5% of your share's value, though some lenders require 10%.
Instruct a solicitor
Appoint a conveyancer experienced in shared ownership. They will review the lease (which can be lengthy and complex), carry out searches and handle the legal transfer.
Exchange and complete
Once all checks are done and finance is in place, you exchange contracts and set a completion date. On completion you receive the keys and your shared-ownership lease begins.
Staircasing: buying more of your home
Staircasing means purchasing additional shares in your home, increasing the percentage you own and reducing the rent you pay on the remaining unowned share. Each additional share is priced at the current market value of the property at the time of purchase, not the price you originally paid.
This is a crucial point: if property values rise, each additional share costs more. If you bought a 25% share of a £300,000 home and the property rises to £360,000 by the time you staircase, a further 25% share will cost £90,000, not £75,000. In a rising market, waiting too long to staircase can make full ownership harder to achieve.
On newer-model shared-ownership leases introduced from 2021, the minimum staircasing increment is 1% of the property's current value, and the housing association must cover some of the associated costs. This was designed to make gradual staircasing more accessible. Older leases typically require minimum increments of 10% at a time.
Each staircasing transaction involves a new RICS valuation (typically £300 to £500), a new mortgage application or amendment, legal fees (often £1,000 to £2,000) and potentially stamp duty if you cross relevant thresholds. Budget for these costs, not just the share purchase price itself.
Once you own 100% of a house, you will usually also acquire the freehold, meaning no more ground rent or service charge. For a flat, you will generally remain a leaseholder and continue paying service charges even at 100% ownership.
Staircasing cost example: from 25% to 50% share
Assuming the property is now worth £320,000 (it was £300,000 at purchase). Buying an additional 25% share at current value costs £80,000.
| Item | Estimated cost |
|---|---|
| Additional 25% share at current value | £80,000 |
| RICS market valuation | £350-£500 |
| Conveyancing fees | £1,000-£2,000 |
| Mortgage arrangement fee (if remortgaging) | £0-£1,500 |
| Stamp duty (if applicable) | Depends on cumulative share and thresholds |
| Total additional cost beyond share price | ~£1,500-£4,000 |
Stamp duty on shared ownership can be complex: you may elect to pay on the full market value upfront (recommended to avoid a second charge later) or in stages. A solicitor experienced in shared ownership can advise on the best approach.
Pros and cons of shared ownership
Shared ownership opens a door to homeownership that might otherwise be closed, but it comes with important trade-offs that are worth understanding before committing.
- Pro: a much smaller deposit and mortgage make buying achievable on a lower income or in a high-cost area.
- Pro: you can staircase to full ownership over time at a pace that suits your finances.
- Pro: more security and stability than private renting, including protection from arbitrary eviction.
- Pro: you benefit from any increase in the property's value proportionate to your share.
- Pro: the government subsidises the rent rate, which is typically below open-market levels.
- Con: you pay rent and a mortgage simultaneously, so total monthly costs can be similar to or higher than renting a comparable home.
- Con: you are responsible for 100% of the service charge and repairs even though you own only a share, which can be a significant expense on older or poorly managed developments.
- Con: most homes are leasehold, bringing lease complexity, potential ground rent and service-charge risk.
- Con: selling can take longer because the housing association has a nomination period (usually eight weeks) to find a buyer first.
- Con: if property values rise sharply, staircasing to full ownership becomes more expensive over time.
Budget for the full running costs, not just the mortgage
Even though you own only a share, you are usually responsible for 100% of the service charge and all internal repairs. On some developments, service charges are high and can rise significantly year on year, particularly where major works are planned. Always ask the housing association for five years of historical service-charge accounts and any planned capital expenditure before reserving a property. Factor rent, service charge and maintenance into your affordability assessment, not just the mortgage on your share.