You can ask the landlord to sell you the freehold at any time. You might also qualify for the right to buy it.
There are different legal steps and rules depending on whether your home is a flat or a house. You can get more information from Shelter - see below.
Right of first refusal
If you live in a leasehold flat and the landlord wants to sell the freehold, they usually have to offer you and the other leaseholders the chance to buy it first. This is known as your ‘right of first refusal’.
Get advice on buying the freehold and right of first refusal from Shelter.