Choose a contractor carefully!
– Always make a building contract, which contains prices to avoid extra works.
– Always contract with an experienced contractor, with good references. Talk with previous house-builders (not only with those recommended by the contractor)! Read about the topic on the internet. Make sure that the contractor have the required assets and workforce, or works with a subcontractor. It is important, because later he can pass the responsibility, when a possible construction defect occurs.
– Ask an expert who is independent of the contractor to be a Site Manager; who will represent your interests objectively in the constuction area!
– Let the contractor use only best quality materials for the building. I you would like to build a passive house choose products, which has a Certification of Passive-House-suitable component, and ask the manufacturer for the certified connections, which contain instructions for proper building to support effective construction.