When it comes to the construction of a custom luxury home, the final cost of the home would definitely be more than the budget you would have initially set for the project. But, that doesn’t mean that you should not set any budget for the project.
When the custom home builder gives you the estimate for the construction of your home, he or she would have left out a lot of things from the estimate. For example, the cost of providing the electrical connections for the whole house, fixing up the pipes, fitting the window coverings and so on would have been left out from the estimate by the builder. These additional costs are commonly termed as finishing costs. These finishing costs might add up to about 20% of the overall estimate provided initially by the builder. So, you should add this up yourself.
There may be some addons to the home which you wouldn’t have anticipated in the beginning of the project. These addons can be anything from small additions to substantial ones. But, you need to account for these costs too in your budget.