You buy or have a project of a house done according to your wishes and let it be realizes by a building company. Whenever the building company needs additional money, they will send you an invoice and the bank will pay for it. Periodically there will be an appraiser coming to the construction, who will always update the current status of the property, its value and will show the bank that financing of money was used for construction. You do not care about anything, and then you move into the final. Quite a fast option, but also financially challenging.