If trading from home is working and you are making money then why not just carry on as you are for now?
Dont be fooled into thinking that operating from a pitch suddenly makes you a "proper" trader. It can really hurt when you have a £1000-£2000 a month to find for rent, yes you will turn over more money by holding more stock but your net profit may well be no better off than as a small outfit from home. And that is all that really matters.