Home Additions in St. Augustine & Northeast Florida
Expand your living space with seamlessly integrated additions.
About Our Home Additions Services
Need more space but love your neighborhood? Home additions let you grow without moving. Wilson & Co builds additions that blend seamlessly with your existing architecture, not afterthoughts that look bolted on. We handle Florida building codes, hurricane requirements, and permitting. Master suites, Florida rooms, in-law quarters, second stories. Founder & Design Builder · License #CGC1532295 · AK Rising.
- Master suite additions with luxury bathroom and walk-in closet
- Florida room and sunroom construction with impact-resistant glass
- In-law suite design with separate entrance and kitchenette options
- Second story additions that maximize your lot
- Garage conversions to living space
- Seamless architectural integration with existing rooflines and materials
- HVAC extension and electrical panel upgrades
- Foundation work including slab and raised foundation options
- Hurricane-rated construction meeting Florida building codes
- Outdoor living additions (covered patios, outdoor kitchens)
Our Home Additions Process
Feasibility
We evaluate your property, review zoning and setback requirements, assess structural capacity, and discuss budget to determine what's possible.
Design
Our team creates architectural plans that integrate beautifully with your existing home, including 3D renderings so you can visualize the finished addition.
Permitting
We prepare and submit all permit applications, handle plan reviews, and coordinate with local building departments in St. Johns, Duval, and Flagler counties.
Construction
Our crews build your addition with minimal disruption to daily life, maintaining weather protection for your existing home throughout construction.
Finishing
We complete all interior finishes, exterior details, landscaping restoration, and ensure perfect integration with your existing home.
Home Additions Service Areas
We provide home additions services throughout Northeast Florida. Click on a location to learn more about our services in your area.
Frequently Asked Questions
How do you match the new addition to my existing home?
We carefully source matching or complementary materials including roofing, siding, windows, and trim. Our designers study your home's architectural style to ensure rooflines, proportions, and details blend seamlessly. When exact matches aren't available, we design transitions that look intentional and enhance your home's overall appearance.
Do I need to move out during construction?
Usually not. We carefully plan construction phases to maintain livable conditions in your existing home. We create weather-tight barriers before opening any walls, manage dust and debris, and schedule noisy work during reasonable hours. Most families stay in their homes throughout addition construction.
What permits are required for a home addition in Florida?
Home additions require building permits including structural, electrical, plumbing, and mechanical permits. In flood zones, additional documentation may be required. We handle all permitting as part of our service, including plan preparation, submission, and coordination of all inspections throughout construction.
How much does a home addition cost in Northeast Florida?
Home addition costs typically range from $200-$400 per square foot depending on complexity and finishes. A basic Florida room might cost $50,000-$80,000, a master suite addition $100,000-$200,000, and second story additions $200,000+. We provide detailed estimates after our feasibility study.
How much does it cost to add a second story addition in Florida per square foot?
In Florida, a second story addition typically costs $250-$450 per square foot in 2025-2026, depending on structural reinforcement needs, roofline complexity, and finish level. A 1,000 sq ft second story addition in Northeast Florida generally runs $250,000-$450,000 all-in. Costs are higher than ground-level additions because the existing foundation and first-floor walls often need reinforcement, and you need temporary weather protection during construction. Wilson & Co provides a detailed feasibility study and cost estimate before any commitment.
What is the cost per square foot for a home addition in Florida in 2026?
For 2026, home addition costs in Florida range from $200-$400+ per square foot depending on the type of addition. Ground-level room additions average $200-$300/sq ft, master suite additions $250-$350/sq ft, second story additions $300-$450/sq ft, and ADUs/in-law suites $225-$375/sq ft. These figures include design, permitting, construction, and finishes. Northeast Florida (St. Augustine, Palm Coast, Flagler Beach) tends to fall in the mid-range compared to South Florida markets.
How long does a home addition take to build?
Timeline depends on size and complexity. A simple Florida room might take 2-3 months, a master suite addition 3-5 months, and a second story addition 5-8 months. Permitting can add 4-8 weeks before construction begins. We provide a detailed schedule during the planning phase.
Ready for Your Home Additions Project?
Contact Wilson & Co Design Build today for a free consultation.