Calculate from your own assumptions
Adjusted amount = area × your unit amount × your adjustment factor. Lower and upper scenarios multiply that amount by your factors and round to whole dollars. Add costs excluded from your unit amount. Results are arithmetic scenarios, not a quote or forecast.
Use one area definition
Choose conditioned floor area or another clearly defined measure and use a unit amount calculated on that same basis. Record whether garages, porches, outdoor structures, or other spaces are included.
Know what the arithmetic does
The tool multiplies area, your unit amount, an adjustment, and lower/upper scenario factors. Changing those inputs changes the result; it does not evaluate the homesite or design.
Complete the owner budget
- Land and transaction expenses.
- Site access, drainage, utilities, and site preparation.
- Design, survey, engineering, permits, and testing.
- Selections and owner purchases outside the construction allowance.
- Outdoor work, temporary living costs, and an owner-selected reserve.