Step 1: Enter the Addition Size

Start by entering the total size of the home addition in square feet. For example, if the addition is 500 square feet, enter 500. Square footage is the main driver of the estimate because larger additions require more lumber, sheathing, hardware, and labor.

Step 2: Select Framing Complexity

Choose the framing complexity level. Select simple framing for basic layouts. Choose moderate framing for additions with more details, openings, or roof connections. Select complex framing for projects with structural work, custom designs, second-story framing, or difficult roof tie-ins.

Step 3: Choose Site Access

Select the site access condition. Easy access means materials and workers can reach the addition area without major restrictions. Limited or difficult access may increase labor because crews need more time to move materials and equipment.

Step 4: Enter Material Cost Per Square Foot

Enter the estimated material cost per square foot. This may include framing lumber, sheathing, connectors, fasteners, headers, blocking, and waste allowance. Material pricing should be updated with current local supplier quotes before using the estimate for serious budgeting.

Step 5: Enter Labor Cost Per Square Foot

Enter the labor cost per square foot. Labor pricing can vary depending on contractor availability, project difficulty, schedule, crew size, and local market conditions.

Step 6: Click Calculate Cost

After entering the values, click the calculate button. The calculator will show the estimated addition framing cost, including materials, labor, complexity and access adjustment, 10% contingency, and total estimated cost.