What deposit do you need?
Your deposit is worked out on the share you are buying, not the full price of the property. Say a home is worth £300,000 and you are buying a 50% share: your mortgage is based on £150,000, and a 5% deposit on that share comes to £7,500.
Some lenders will accept a deposit as low as 5% on a shared ownership purchase, much like standard 95% LTV mortgages, though a larger deposit usually opens up better interest rates. Your adviser can tell you exactly how much you need to put aside.
Costs beyond the deposit
Beyond the deposit there are solicitor fees, a valuation and, on some deals, a mortgage arrangement fee to pay. Stamp duty land tax, the government tax on property purchases, may also apply. It depends on what your share is worth and whether you choose to pay in stages or on the full market value upfront.
It is worth setting money aside for moving costs, furniture and a rainy-day fund too. Your adviser will give you a clear breakdown of everything you need before you commit to anything.