1. Planning
Everything is in the planning! Take your time and get the planning just right. Make sure you have detailed documentation and drawings so that there is not a lot of back and forth between you and the contractors once construction starts. This will save you both money and time down the track.
2. Materials
Make sure you have selected your materials so that each compliment the other and so that the house, as a whole, feels cohesive from space to space. It is also important to provide a clear schedule of material finishes for contractors. Clarity it key here, so no changes need to be made on the go, as this is when the overwhelm can kick in.
3. Budget
Put together a budget so that you can stay on track of spending. Once you can see the full picture financially, you can then value manage by swapping some materials or fixtures out for cheaper alternatives. And don't forget to leave some allowance for the soft furnishings and landscaping.