Because the project has now been fully documented by the architect through the technical design and these pieces form the basis for the agreement with the contractor, you know exactly what to expect from the contractor. At this moment you have the option of having a number of contractors make a price offer based on the technical design. Because the contractors determine their price on the basis of exactly the same conditions, the offers can be compared well. This way you not only know exactly what you are getting, but also at what price. The architect advises you in the selection of contractors and supports you in assessing the offers.