Charleston Home Additions

Home additions in Charleston typically cost $150-$350 per square foot depending on the type and finishes. A sunroom runs $40,000-$80,000. An in-law suite costs $80,000-$150,000. A master suite addition averages $80,000-$120,000. Second story additions start at $150,000+. Cost depends on foundation requirements, structural work, finishes, and HVAC integration.

Home additions typically take 3-6 months from permit to completion. A sunroom takes 6-10 weeks. A room addition takes 3-4 months. An in-law suite or second story takes 4-6 months. Timeline includes design and engineering (2-4 weeks), permitting (2-4 weeks), foundation (1-2 weeks), framing (2-3 weeks), systems rough-in, and finishing.

Zoning requirements vary by neighborhood and lot. Key factors include setback requirements (distance from property lines), lot coverage limits (maximum percentage of lot that can be built on), height restrictions, and HOA rules. We research your specific property's zoning during the consultation phase and handle all variance applications if needed.

The foundation type depends on your existing home and soil conditions. Common options in Charleston include slab-on-grade (most affordable), crawl space (matches many existing Charleston homes), and pier foundations (ideal for flood zones and coastal properties). We work with structural engineers to design the right foundation that integrates seamlessly with your existing structure.