Hi there, a person age 19 owns a piece of property ( land + house )...if a new house is built on this property replacing the old one, and when she reaches 21, I think this is the maturity age in Thailand....can she includes her sister's name as co-owner of the property to be reflected on the Tabien Bann.....Thanks

Yes, just pay the fee to register.

Simple to do. Get more info from the necessary office and they can tell you approximate fees and when your ready yo add a name they can tell you exact fees