Budgeting for a Home Renovation: A Realistic Framework
Most renovation budgets only account for construction cost — materials and labor — because that's the number a contractor quotes first. A realistic budget has three more parts most homeowners underweight or forget entirely: professional fees, contingency, and soft costs.
Professional fees for architectural, structural and interior design work typically run 8 to 15 percent of construction cost for a renovation, depending on scope and how much design coordination is involved. It's tempting to cut this to stretch the construction budget further, but under-scoped design work is one of the most reliable ways to generate expensive change orders later.
Contingency exists specifically for what a structural and utility survey doesn't catch, and for decisions that change mid-project. On renovation work, 15 to 25 percent of construction cost is a realistic contingency, higher than the 5 to 10 percent that's usually sufficient for new construction on a clean site.
Soft costs — permit fees, temporary accommodation if the home isn't livable during work, storage, utility connection charges — rarely appear in a contractor's quote at all, because they're not construction line items. Adding a rough 5 percent allowance for soft costs, even as a placeholder, keeps the final number closer to what you'll actually spend.