A total construction budget is not enough.
You need priorities.
Structure, windows, kitchen, bathrooms, flooring, pool, landscaping, lighting, mechanical systems, technology, furniture, and contingency all compete for the same dollars.
Spend first on things that are expensive or disruptive to change later.
Structure, ceiling heights, major windows, plumbing layout, electrical capacity, insulation, drainage.
Appliances and decorative finishes can usually be replaced later.
Beware finish inflation.
Tile becomes slightly more expensive. Then faucets. Then cabinets. Then appliances. Each upgrade seems manageable by itself.
Together they can destroy the budget.
Decide in advance where you are willing to splurge and where you are not.
A budget is not merely a restriction.
It is one of the tools that forces the design to reveal what actually matters.