A shared ownership mortgage lets you buy between 10% and 75% of a home and pay subsidised rent on the rest to a housing association, with your mortgage covering only the share you buy rather than the full property value. That makes both the deposit and the monthly mortgage payment considerably smaller than buying outright, which is why the scheme appeals to buyers who can afford repayments but not a full deposit. It’s not free money, though: you’ll pay rent on top of your mortgage, plus service charges, and the scheme comes with real restrictions on staircasing costs and reselling that any balanced guide needs to cover honestly. This one does, including the criticisms as well as the benefits.
How a shared ownership mortgage actually works
You buy a percentage share of a property, typically starting from 10% under the current model, up to a maximum of 75%. A lender provides a mortgage on that share only, and you pay monthly rent to the housing association, council or other provider on the portion you don’t own.
The property itself is nearly always leasehold, so alongside your mortgage and rent, you’ll also pay a service charge covering buildings insurance, communal maintenance and, in many developments, a management fee. Over time you can buy further shares through a process called staircasing, gradually reducing your rent until, in most cases, you reach 100% ownership and stop paying rent altogether.
Eligibility is set by Homes England in England: your household income must be £80,000 a year or less, or £90,000 or less in London, and you need to be unable to buy a suitable home outright on the open market. There’s no cap on the property’s price, only on your income.
Shared ownership deposit: how much you actually need
This is the headline benefit, and it’s real. Because your mortgage only covers your share, your deposit is calculated against the share value rather than the full purchase price, usually 5% to 10% of that share depending on the lender.
Take a £320,000 property where you’re buying a 35% share, worth £112,000. A 5% deposit on that share is £5,600, and a 10% deposit is £11,200, a fraction of what you’d need to put down buying the same property outright. That gap is the entire financial case for shared ownership as a route onto the property ladder, particularly for buyers who can service monthly repayments comfortably but haven’t been able to save a large lump sum.
Bear in mind lenders still run a full affordability assessment on your income against the combined cost of mortgage, rent and service charge, not just the mortgage payment alone. A smaller deposit doesn’t automatically mean an easier approval.
Rent on the retained share, and how it changes over time
The rent you pay on the share you don’t own is set as a percentage of that share’s value, usually capped at 3% a year, though many providers charge 2.75% or less. On our £320,000 example with a 35% share owned, the unsold 65% is worth £208,000, so rent at 2.75% works out to £5,720 a year, or roughly £477 a month, on top of your mortgage payment.
Rent isn’t fixed for the life of the lease. Most housing association leases review rent annually, and the increase is capped at the rise in the Retail Price Index over the previous 12 months, plus 0.5%. Newer leases granted since 12 October 2023 under the government’s rent reforms typically use a CPI-based formula instead, which tends to run lower than RPI, though older leases funded before that date may still use the RPI-plus-0.5% model. Either way, rent only moves in one direction: it can rise, but it won’t fall, so budget for the rent to be noticeably higher in five years’ time than it is on day one.
Service charges: the cost that catches people out
Service charges cover buildings insurance, communal repairs, grounds maintenance and, on larger developments, a management company’s fee. These typically run from around £100 to £300 a month, though this varies enormously by building type, and high-rise developments with lifts, concierge services or extensive communal facilities can run considerably higher.
This is genuinely one of the scheme’s weaker points. Housing sector research, including evidence submitted to Parliament’s Levelling Up, Housing and Communities Committee, has highlighted cases where service charges have run well above what buyers were told to expect at the point of purchase, sometimes making a property harder to sell later because the combined mortgage, rent and service charge stretches a buyer’s affordability past what a lender will approve. Ask for at least three years of historical service charge accounts before committing, not just the current year’s estimate, since new-build developments in particular can see charges rise sharply once initial developer subsidies end.
Staircasing shared ownership: buying more of your home
Staircasing is the process of buying additional shares in your property after you’ve moved in, gradually increasing your ownership percentage and reducing the rent you pay proportionally.
Homes bought under the “new model” lease, introduced from April 2021 for developments funded through the Affordable Homes Programme, allow staircasing in increments as small as 1% a year for the first 15 years, with reduced administration fees during that window. Not every shared ownership property uses the new model, though: older leases, and some resale properties, may still require larger staircasing steps, commonly 5% or 10% at a time, so check which lease model applies to a specific property before assuming you can staircase gradually.
Each staircase transaction requires a fresh RICS valuation, typically £200 to £500, plus legal fees of roughly £500 to £1,500. Crucially, you buy each new share at current market value, not the price you originally paid, so if property values have risen since your purchase, staircasing becomes proportionally more expensive. Stamp duty can also become payable on later staircase purchases once your cumulative ownership crosses certain thresholds, so it’s worth checking the position with a solicitor rather than assuming staircasing is always tax-free.
Shared ownership mortgage comparison: which lenders offer it
Not every mortgage lender offers shared ownership products, and this is one of the scheme’s practical limitations. The panel of active lenders is genuinely smaller than the mainstream mortgage market, which can mean fewer competing rates and a narrower choice of deals compared with a standard residential purchase.
Leeds Building Society is generally regarded as the largest dedicated shared ownership lender in the UK and has been recognised for its shared ownership lending for several consecutive years, according to the society’s own evidence submitted to a 2024 parliamentary inquiry. Other active lenders include Halifax, Nationwide, Newcastle Building Society, Newbury Building Society, and Skipton Building Society, though product availability, maximum share sizes and criteria differ between them. Because this is a specialist corner of the mortgage market, a broker experienced specifically in shared ownership tends to find better matches than a general high-street comparison, particularly if your chosen property has any complicating factors like cladding remediation work outstanding.
Shared ownership pros and cons, covered honestly
The scheme has genuine strengths and genuine weaknesses, and a fair comparison needs to hold both at once.
The case for it: a significantly smaller deposit than buying outright, monthly costs that are often lower than renting the same property privately in expensive areas, and a realistic staircasing route to full ownership over time if your income grows. For many first-time buyers priced out of their local market entirely, it’s a genuine way onto the ladder rather than an indefinite rental trap.
The case against it: you’re paying mortgage, rent and service charge simultaneously, and the combined monthly cost can end up close to, or sometimes above, what a full mortgage on the same property would cost, depending on the share size and local rents. You’re a leaseholder, subject to lease terms, service charge decisions largely outside your control, and (as covered below) genuine difficulty selling in some circumstances. Staircasing at rising market values means your path to 100% ownership can get more expensive over time, not less, if the local property market performs well.
Cladding, service charge disputes and the difficulty of selling
This is the part balanced coverage of shared ownership can’t skip, because it’s affected a meaningful number of real buyers, not a hypothetical edge case.
Following the Grenfell Tower fire in 2017, many leasehold flats, including a significant number of shared ownership properties in low-rise and high-rise blocks alike, became subject to building safety checks, commonly requiring an EWS1 form confirming external wall safety before a lender would offer a mortgage on the property. Shared ownership leaseholders were disproportionately affected because they tend to live in newer-build blocks, the same stock most likely to have used the cladding materials later found to be unsafe. Sales fell through, sometimes repeatedly, while buildings waited years for remediation funding and works to be completed, and some shared owners found themselves unable to sell or remortgage at all during that period.
The position has improved since 2022, when a group of major lenders signed an industry pledge to lend without requiring an EWS1 form in many circumstances, provided remediation funding was confirmed through a recognised scheme. That pledge doesn’t cover every lender, though, and building societies, which carry a disproportionate share of shared ownership lending, have been slower and more inconsistent in adopting it than some of the largest banks, according to campaign group End Our Cladding Scandal’s ongoing work on the issue. If you’re buying a flat in a block built from the mid-2000s onward, ask directly about cladding status and any remediation timetable before committing, since this can affect your ability to sell years down the line even if it isn’t a problem today.
Separately, resale itself works differently from a standard property sale. Under most leases, the housing association has a nomination period, an exclusive window, historically up to 8 weeks and reduced to as little as 4 weeks under the new model lease, during which they have first right to find a buyer for your share before you can market it privately or through an open-market estate agent. Buyers for your resale also need to meet the same income eligibility criteria as any other shared ownership purchaser, which narrows your pool of potential buyers compared with an open-market sale. Combined with high service charges putting off some buyers’ lenders, this is why shared ownership properties can genuinely take longer to sell than equivalent open-market homes, and it’s a fair criticism rather than an isolated complaint.
FAQs
How does a shared ownership mortgage work?
You take out a mortgage on a share of a property, typically between 10% and 75%, and pay subsidised rent to a housing association on the remaining share. Your mortgage covers only your share of the purchase price, which means a smaller deposit and mortgage payment than buying the property outright.
What deposit do I need for shared ownership?
Most lenders require 5% to 10% of the share value you’re buying, not the full property price. On a 35% share of a £320,000 home, a 5% deposit is £5,600 rather than the £16,000 you’d need for a 5% deposit on the full property.
Who is eligible for shared ownership in England?
Your household income needs to be £80,000 a year or less, or £90,000 or less in London, and you need to be unable to afford a suitable home outright on the open market. There’s no upper limit on the property’s price, only on your income.
How does staircasing work?
Staircasing means buying additional shares in your property over time, gradually increasing your ownership percentage and reducing your rent proportionally. Newer leases allow 1% annual increments for the first 15 years with reduced fees, while older leases often require larger steps, and each purchase is made at the property’s current market value rather than the original price.
Is shared ownership worth it compared to renting?
It can be, particularly in expensive areas where a full mortgage is unaffordable, since combined mortgage and subsidised rent are often lower than the market rent on the same property. Whether it beats renting depends heavily on service charges and rent increases at your specific property, so run the actual numbers before comparing headline figures.
Can I sell a shared ownership property easily?
It’s typically slower than selling on the open market. The housing association usually has a nomination period, often 4 to 8 weeks, to find a buyer before you can market it independently, and any buyer must also meet shared ownership eligibility criteria, which narrows the buyer pool.
Do all lenders offer shared ownership mortgages?
No, the lender panel is considerably smaller than the mainstream mortgage market. Leeds Building Society is widely regarded as the largest dedicated shared ownership lender, alongside others including Halifax, Nationwide, Newcastle Building Society and Skipton Building Society, though criteria and maximum share sizes vary between them.
What’s the difference between the old and new shared ownership model?
The new model, introduced from April 2021 for schemes funded through the Affordable Homes Programme, reduced the minimum initial share from 25% to 10%, allows 1% staircasing increments with lower fees for the first 15 years, and shortened the resale nomination period from up to 8 weeks to as little as 4 weeks. Older properties may still operate under the previous rules, so it’s worth confirming which lease model applies before you buy.
