Addition Cost Calculator
Calculate cost per square foot for your home addition
Addition Configuration
Configure your home addition to get an accurate cost estimate
Enter the total square footage of your addition
What affects the cost?
- • Structural complexity and engineering requirements
- • Local building codes and permit requirements
- • Quality of finishes and fixtures selected
- • Site conditions and access for construction
- • Seasonal material and labor pricing variations
Your Addition Estimate
Cost estimate based on current construction costs in your area
Estimated Total Cost
$131,600 - $238,400
Most likely: $185,200
Cost Per Square Foot
$329 - $596
Average: $463 per sq ft
Cost Breakdown
Foundation Work$27,780
Framing & Structure$37,040
Electrical$22,224
Plumbing$18,520
Insulation$14,816
Drywall$27,780
Flooring$18,520
Finishing$18,520
Project Details
Size:
400 square feet
Type:
single story
Finish Level:
standard
Features:
Foundation, Utilities
*Estimates are approximate. Final pricing requires site evaluation and detailed plans.
Understanding Addition Costs
Cost Factors
- • Foundation requirements
- • Structural modifications
- • Utility connections
- • Roofing integration
- • Interior finish level
- • Local permit costs
What's Included
- • All structural work
- • Basic electrical & plumbing
- • Insulation & drywall
- • Flooring installation
- • Interior trim work
- • Exterior siding match
Additional Costs
- • Architectural plans
- • Structural engineering
- • Special permits
- • Temporary utilities
- • Site preparation
- • Landscaping restoration
Why Choose RG Construction for Your Addition?
With over 20 years of experience in home additions, we understand the complexities of integrating new space with existing structures. Our team handles everything from initial design to final inspection.
We pride ourselves on transparent pricing, quality workmanship, and minimal disruption to your daily life. Every addition comes with our comprehensive warranty and ongoing support.