Yes, you can.
If you and your partner both have Lifetime ISAs with us, you can put them both towards a qualifying joint house purchase. You'll both be able to get 25% bonuses towards buying your first home together. Your solicitor/conveyancer will factor this into your house purchase and we'll liaise with them to ensure the safe withdrawal of these funds so you can complete your sale.
Alternatively, you may be eligible for a Lifetime ISA, but your partner isn't (eg: if they have owned a home before). Don't worry, this won’t impact your eligibility or your ability to use the money to buy a house.
For all types of house purchase - joint or solo - the maximum house purchase price of £450,000 still applies. This maximum purchase price does not double for a joint purchase.