A room addition is one of the most effective ways to gain the space you need without the cost and disruption of moving. But the question every homeowner asks first is: how much will it cost? Here is an honest, transparent 2026 pricing guide for room additions in Miami.
Average Room Addition Costs in Miami by Type
Bedroom Addition: $40,000 to $90,000
A standard bedroom addition (12 to 14 feet) in Miami typically runs $40,000 to $90,000 including foundation, framing, roofing, electrical, HVAC tie-in, flooring, drywall, paint, and finish work. Adding an en-suite bathroom typically adds $20,000 to $40,000 to the project cost.
Bathroom Addition: $25,000 to $60,000
A new bathroom addition in Miami ranges from $25,000 for a basic powder room to $60,000 or more for a luxury master bath addition with custom finishes. Cost varies significantly based on plumbing routing complexity, fixture selection, and tile work.
Family Room or Great Room Addition: $60,000 to $180,000
A large family room or great room addition in Miami typically runs $60,000 to $180,000 depending on size, ceiling height, and whether you are opening up walls to integrate with existing living spaces. Vaulted ceilings, custom windows, and built-in features add to the total.
Second-Story Addition: $200,000 to $500,000+
Adding a complete second story to a Miami home requires structural engineering, new staircase construction, expanded HVAC and electrical capacity, and often significant first-floor reinforcement. Total costs typically run $200,000 to $500,000 or more depending on size and finishes.
Key Cost Factors for Miami Room Additions
Foundation type (slab on grade vs raised foundation), roof type and complexity, HVAC capacity and ductwork modifications, electrical panel capacity, plumbing routing, finish selections (flooring, paint, fixtures), and impact-rated windows and doors all significantly affect total cost. Most Miami room additions require permits from the local building department — IG Construction handles all permitting.
Typical Timeline
Most Miami room additions take 8 to 16 weeks from permit approval to final inspection. Larger second-story additions can take 6 to 12 months.
Get a Free Room Addition Quote
IG Construction designs and builds room additions throughout Miami-Dade and Broward County. Call (305) 686-8639 or request a free quote.