During the discovery process is often overlooked by clients and not explained to by contractors. But by doing this, you really get to analyze your existing home structure and systems and deficiencies and either this allows you then to ascertain where you need to include these parts in your project.
And this prevents a large oversight on a lot of projects where Projects systems have to be replaced or structures need to be upgraded, which can be a huge overco and the overrun in the budget and cause a lot of unnecessary stress to the clients. Your contractor should analyze those structures and systems to ensure how they're gonna be impacted, and if it's necessary to replace and remove or update Those systems and have them included in your budget, even if it's just an alliance for potential replacement. This way that you have a contingency set aside to cover the costs.