Every month, thousands of Londoners find themselves caught in the same difficult calculation: keep renting at eye-watering cost, or take the step into shared ownership houses in London and begin building genuine equity in one of the world’s most competitive property markets. The numbers behind that choice are rarely straightforward. Starck Uberoi Solicitors set out the real monthly cost comparison, clearly, and without the marketing gloss.
What Is Shared Ownership — and How Does It Work?
Before the cost comparison, a brief primer. If you have been searching how does shared ownership work, the answer is this: shared ownership is a government-backed scheme that allows buyers to purchase a portion of a property, typically between 25% and 75%, and pay rent on the remaining share, which is owned by a housing association.
Over time, you can purchase more shares of the property through a process called staircasing. Staircasing refers to the process of buying additional shares in your property, which increases your ownership percentage, reduces the rent you pay, and can eventually lead to full ownership.
Shared ownership is targeted at first-time buyers who cannot afford the full market cost of a property. In London, the household income cap for shared ownership is £90,000 a year, compared with £80,000 elsewhere in England. This is a cap, not a target. You also need to demonstrate that you cannot affordably buy a suitable home on the open market and meet the housing provider’s and lender’s affordability criteria.
The State of London Rents in 2026
The rental market in the capital gives context to why shared ownership in London has taken on such urgency for so many buyers. As of May 2026, London had the highest average monthly private rent of any English region, at £2,294, though its annual rent inflation rate of 2.0% in the twelve months to May 2026 was actually the lowest in England. That relative cooling offers little comfort to those already priced out: the North East, England’s most affordable region for renting, averaged just £776 per month over the same period. The gap between the two is stark.
Those figures, drawn from ONS data, mask significant variation within London itself. The Royal Borough of Kensington and Chelsea tops the chart at an average of £3,616 per month, the most expensive private rent anywhere in the UK, while Westminster averages £3,251 per month. At the other end of the scale, Bexley remains the cheapest London borough for renting, at an average of £1,485 per month.
The trajectory matters as much as the current figure. The typical London renter spends close to half of their post-tax income on housing. There is nothing left in that arrangement to build towards ownership; every pound simply maintains someone else’s asset.
The Supply Picture: Why Shared Ownership in London Is Under Pressure
Any honest discussion of shared ownership in London must acknowledge the supply constraints bearing down on the market. According to the official MHCLG affordable housing supply statistics, only 3,991 affordable homes were started in London in 2024/25, the second lowest figure since records began in 2013/14.
The context is sobering. London City Hall has confirmed that the 2021 to 2026 Affordable Homes Programme target was cut from 35,000 starts to between 17,800 and 19,000 starts in May 2025. Against that revised, and already reduced, ambition, the actual delivery figure falls well short.
Within that broader picture, shared ownership fared somewhat better. In 2024/25, 2,988 new shared ownership properties were delivered in London, representing around 15% of the 20,353 shared ownership homes delivered across England as a whole, according to the same MHCLG data. Almost all of the London total, 2,973 homes, were new build. That concentration of new-build delivery in a city where supply is so constrained reinforces why competition for available shared ownership properties remains intense.
What Does Shared Ownership in London Actually Cost Each Month?
This is where the comparison becomes genuinely instructive. With shared ownership in London, your monthly outgoings are split across three distinct elements: a mortgage on the share you own, rent on the share you do not, and a service charge.
The Mortgage
With part ownership houses in London, your mortgage is calculated only on the share you purchase. As an example, prices at one current London development start at £118,750 for a 25% share of a one-bedroom apartment with a full market value of £475,000. On that basis, a buyer putting down a 10% deposit of approximately £11,875 would be financing roughly £106,875 through a mortgage, a materially smaller sum than a full-market purchase would require.
The Rent on the Unowned Share
Shared ownership rent is typically pitched at around 3% of the share that you do not own. So if you buy a 40% share of a property worth £200,000, your yearly rent will be 3% of the 60% share. Divide by twelve and you have your monthly rent figure. Critically, after five years, rent could increase by as much as the Retail Prices Index figure compounded each year, a detail buyers must model carefully from the outset.
Service Charges
These should never be overlooked. Survey data on service charges across leasehold properties in England and Wales in 2024 shows the average cost at £3,634 per leaseholder, up from £2,523 in 2019, a 50% increase in five years. In a London context, where many shared ownership properties are flats in managed buildings, service charges can be substantial and are not capped.
The Real Comparison: A Working Example
The median income of London households who purchase shared ownership homes is £41,000, significantly lower than the average income of mainstream first-time buyers, which is £60,000. That profile illustrates the gap shared ownership is designed to bridge.
Consider a buyer purchasing a 40% share of a property valued at £400,000 in an outer London borough. Their share purchase price is £160,000. With a 10% deposit (£16,000), they are financing £144,000 by way of mortgage. At current rates, that might produce a monthly mortgage payment of around £750 to £800. Rent on the remaining 60% at 3% per annum equates to approximately £600 per month. Add a service charge of, say, £200 per month, and the total monthly outgoing sits at roughly £1,550 to £1,600.
Compare that with average private rents in equivalent outer London areas, which commonly sit between £1,500 and £1,800 per month for a comparable property. On a pure monthly cost basis, the differential may appear modest. But the shared ownership buyer is building equity with every mortgage payment. The renter is not.
Staircasing: London’s Outsized Role
One further data point deserves attention. According to the MHCLG affordable housing supply statistics, there were 4,781 low-cost home ownership sales in 2024/25 where the buyer staircased to 100% ownership. London accounted for 34% of those transactions, a striking concentration, given that London represented around 15% of new shared ownership delivery in the same year.
That disparity is telling. London shared owners are staircasing to full ownership at a disproportionately high rate, which may reflect the strength of London’s resale market, the financial incentives of owning outright in a high-value city, or simply the profile of buyers who entered the scheme in earlier years. Whatever the reason, it suggests that shared ownership in London is functioning, for many, as a genuine route to outright ownership, not merely a long-term halfway house.
The Expert View
Raminder Uberoi, Partner and Head of Property Law at Starck Uberoi Solicitors, sets out the position with characteristic clarity:
“One of the main advantages of shared ownership over renting is that a proportion of your monthly payments contributes towards ownership of the property, rather than solely covering a landlord’s investment. Shared ownership can also offer greater stability and the opportunity to increase your ownership stake over time through staircasing. However, buyers should remember that they will usually continue to pay rent on the share they do not own, alongside service charges and other homeowner responsibilities. Before deciding between shared ownership and renting, it is important to consider not only the monthly costs, but also your future plans, job security and ability to meet the financial and legal commitments that come with property ownership.”
What the Data Shows About Shared Ownership Take-Up
The scale of engagement with the scheme reflects its relevance. From 1 April 2024 to 31 March 2025, 18,603 initial shared ownership sales were completed by large private registered providers and local authorities in England, an increase of 2% compared with 2023/24. In 2024/25, an estimated 70% of private registered provider shared ownership purchases were made by first-time buyers.
The tenure has come under increasing scrutiny as the building safety and cost of living crises have contributed to rising costs for shared owners, raising genuine questions about whether shared ownership can continue to be considered affordable homeownership in all cases. That scrutiny is healthy, and it is precisely why independent legal advice matters before proceeding.
The Legal Process: What Happens When You Buy
The process of buying shared ownership property is a leasehold transaction with additional layers of complexity beyond a standard conveyancing matter. You are entering into a lease with a housing association, agreeing terms around staircasing, repairs and maintenance responsibilities, and future resale. Each of those elements needs to be read, understood, and negotiated where appropriate before exchange.
The key is to model the full monthly cost, mortgage, rent, and service charge, and to understand the lease, resale and staircasing terms before committing. That is not a task to undertake without specialist guidance. The stamp duty position should be modelled at the same time.
Speak to Starck Uberoi Solicitors
Starck Uberoi Solicitors has offices conveniently located across London and the South East. Our Brentford solicitors are situated on the High Street in a grand three-storey building, a short distance from Brentford County Court. Our Belgravia solicitors are just a five-minute walk from Victoria tube station in Grosvenor Gardens. Our Ealing solicitors are a short walk from both Ealing Broadway and South Ealing, and our Richmond solicitors have the pleasure of overlooking the picturesque Richmond Green. Our solicitors in Canterbury are located within the UNESCO World Heritage Site of Canterbury Cathedral. Our partner, Raminder Uberoi, can also offer a Notary Public service at any of our London offices.
Whether you are considering shared ownership houses in London for the first time or are ready to proceed, Starck Uberoi Solicitors advises on every stage of a shared ownership transaction, from initial eligibility questions through to exchange, completion, and eventual staircasing.
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