HMOs have more complexity associated with them. HMO licensing, planning, management, fire safety etc so they typically have more legal work associated with them and can take a bit long. With cash purchases, the average time to go through conveyancing is approx 6 weeks start to finish, but does vary depending on complexity. With mortgage purchases the additional element to factor in is the valuation, which can take from 2 to 6 weeks depending on the availability of a surveyor.