Shared Ownership Mortgage Calculator for London
London shared ownership has its own rules: a £90,000 household income cap, shares from 10%, and rent on the unsold share that can top £1,000 a month. Enter the price, your share, deposit, rent and service charge and see what 32 lenders would lend on your share, with the rent counted the way they count it.
Lender criteria last reviewed September 2026.
Check My London Shared Ownership BorrowingFree. Two minutes. No credit search.
Still browsing listings? Run it on the home you like most. The answer tells you whether the share on offer is one a lender will actually fund.
What is different about shared ownership in London
A £90,000 income cap
Household income must be £90,000 or less in London, against £80,000 elsewhere in England. There is no cap on the property price, so a £600,000 or £800,000 home can still be bought through the scheme.
Rent on the unsold share decides it
At up to 2.75% a year of the part you do not own, London rent is often larger than the mortgage payment. Lenders deduct it, and the service charge, before they set your maximum loan.
Fewer lenders, each with its own share limit
32 of the 58 lenders we check lend on shared ownership. Some only lend from a 25% share and each caps its loan at its own percentage of the share value.
Two London examples
Both use the figures a listing on Share to Buy, Homes for Londoners or a housing association’s own site gives you: full price, the share on offer and the monthly rent, plus the service charge from the Key Information Document.
A typical first share: £600,000 flat, 25% share
- Share value £150,000, 5% deposit on the share £7,500, mortgage needed £142,500
- Rent on the £450,000 unsold share at 2.75% a year: about £1,031 a month
- Service charge, say £250 a month
The mortgage is modest. The £1,281 a month of rent and service charge is what the lender tests you against, and it is why this case turns on lender choice rather than salary.
At the ceiling: £800,000 home, 40% share
- Share value £320,000, 10% deposit on the share £32,000, mortgage needed £288,000
- Rent on the £480,000 unsold share at 2.75% a year: about £1,100 a month
- Service charge, say £300 a month
A £288,000 loan under the £90,000 income cap, with £1,400 a month deducted first, sits close to most lenders’ limits. A handful will do it and most will not. That gap is exactly what the tool shows you lender by lender.
Worked maths from the scheme’s standard 2.75% rent basis, not a live lender run. Run the tool with your own figures for the lender-by-lender answer.
What you will need
- The full purchase price of the home
- The share you are buying (10% to 75%)
- Your deposit — on the share, not the full price
- The monthly rent on the unsold share
- The monthly service charge, which on London flats is often £150 to £400
- Your income and any credit commitments
Buying outside London? Use the national shared ownership calculator. For the two-stage assessment and the income rules, read the shared ownership affordability guide.
Run My London Shared Ownership CheckFrequently asked questions
Is the shared ownership income cap different in London?
Yes. To buy through shared ownership your household income must be £90,000 or less in London, against £80,000 or less elsewhere in England. It is gross household income, so salary, self-employed profit, regular overtime and bonuses all count. There is no cap on the property price, which is why London shared ownership homes can be listed at £600,000 or more.
What is the minimum share I can buy in London?
New-model leases, which cover most homes built or first sold since 2021, let you buy from a 10% share. Older leases usually start at 25%. Lenders set their own minimums too, and some will only lend from a 25% share, so the share you choose changes which lenders will look at you at all. The tool applies each lender's own limit.
Why is the rent such a large part of the London calculation?
Because it is charged on the share you do not own, and in London that is a big number. Rent is typically up to 2.75% a year of the unsold share, so on a £600,000 home where you buy 25% the rent is around £1,031 a month before the service charge. Lenders deduct that as committed spending before they work out your maximum loan, which is why two people on the same salary can get very different answers depending on the share and the price.
Does the calculator work for resale shared ownership homes in London?
Yes. The maths is the same: share value, deposit on the share, rent on the rest and the service charge. On a resale the lease may be an older one, which usually means a 25% minimum share and rent that has been rising with inflation, so check the current rent on the listing rather than the original figure.
Does it run a credit check?
No. It uses lenders' own published affordability calculators and criteria, with no credit search and no application.
Do I need a mortgage adviser for shared ownership in London?
In practice, yes. The housing association asks for a financial assessment from a qualified adviser before it accepts a reservation, and in London the lender choice matters more than anywhere else because the rent and service charge push most cases close to a lender's limit. This tool gives you the lender answer to take into that conversation.
Results are indicative and based on lenders’ published calculators. They are not a mortgage offer or advice.
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