Shared ownership mortgages

Shared ownership properties are sold by housing associations and a small number of for-profit providers. You buy a share of the property, typically 25% to 75% on initial purchase, and the housing association retains the rest. You pay a mortgage on your share and rent on the housing association share, plus service charges and any ground rent.

Mortgage and rent together

The combined monthly cost of mortgage plus rent plus service charges is what lenders use for affordability. Lenders comfortable with shared ownership are familiar with the calculation and treat it appropriately. Lenders less comfortable will sometimes decline cases that should be placeable. We pick from the lender pool that knows shared ownership.

Worked example on a £300,000 property, 50% share

You buy a 50% share of a £300,000 home for £150,000. With a 5% deposit on your share (£7,500) you take a mortgage of £142,500. The housing association keeps the other 50% (£150,000) and charges rent of typically 2.75% of their share value, around £345 a month. Add a service charge of £150 a month on a flat. Your monthly outgoing is mortgage repayment plus £345 rent plus £150 service charge. Versus a full open-market purchase of the same property, your deposit is £7,500 not £15,000, and you can buy at half the income multiple. The trade-off is that your housing cost includes rent that is not building equity.

Staircasing

Staircasing means buying additional shares of your property over time, increasing your ownership and reducing your rent. Each round of staircasing involves a fresh valuation, legal fees and usually a new mortgage product. Many leases allow staircasing in defined increments, often 10% or 25% at a time. Some leases allow you to staircase to 100% (full ownership), some cap at 75% or 80%. Read the lease carefully on this point.

The lease pitfalls

Shared ownership properties are leasehold, with the housing association as landlord. Service charges can rise. Ground rent terms vary. Some older shared ownership leases have onerous restrictions on subletting, alterations or pets. Some have rent reviews tied to inflation that can step up materially. Your conveyancer should review the lease in detail before exchange. We brief you on what to ask them to look for. Specifically: the rent review formula (RPI plus a margin is the typical pattern, with the margin worth checking), the staircasing cap, the sublet restrictions, the consent requirements for alterations, and the residual lease term (anything under 80 years should be flagged).

Selling a shared ownership property

Most shared ownership leases give the housing association first refusal when you sell, typically with an eight-week marketing window before you can list on the open market. This adds time to a sale but does not usually stop it. Pricing is set by an independent valuation. Plan for this if you might want to sell in three to five years.

Service charge realism

Annual service charges on shared ownership flats can be substantial and are typically higher than on houses. Service charges trend up faster than rent, particularly on blocks with cladding remediation works, ageing lifts or major roof projects. Pull the historical service charge schedule and any recent major-works notices before exchange. We brief your conveyancer to ask.

Common pitfalls we see

Buying a 25% share when you could afford a 40% share, then staircasing later at higher property prices and paying more overall. Picking a lender who does not understand shared ownership and getting an unnecessary decline. Skipping the lease review and finding restrictions on letting or alterations later. Not modelling the impact of the annual rent review set out in your lease over a long holding period. We work all of these in the planning conversation.