How to create a realistic budget for your building project

https://practicalpropertyprojects.birchreport.com/posts/how-to-create-a-realistic-budget-for-your-building-project

Start by listing every cost you can think of: materials, labor, permits, and a 10-15% contingency for surprises. Research local prices and get at least three quotes from contractors. Prioritize your needs over wants, and track every expense against your plan to stay on target.