Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Styles & brands we work with
See the difference
Before
After
Before
After
Before
AfterHow Much Does a Home Addition Cost in Miami?
A home addition in Miami typically costs between $53,100 and $153,400 in 2026, with most mid-size projects landing in the $80,000 to $120,000 range. The final number depends on square footage, foundation type, finish level, and whether you’re building out or up. At Mason Remodeling Co Miami, we put a written price in front of you before any work starts, so the number you approve is the number you pay.
Here’s the short version: a basic bump-out or single-room addition starts around $53,000. A larger multi-room addition with a bathroom and upgraded finishes will push toward $153,000 and beyond. We’ll walk you through exactly what drives those numbers below, including Miami-specific costs that national price guides miss.
If you’re planning an addition and want a real number for your specific property, call (850) 780-8123. Estimates are free, and you’ll get a written price, not a verbal ballpark.
Key Takeaways
- Miami home additions cost $53,100 to $153,400 on average in 2026.
- You’ll pay roughly $180 to $400 per square foot depending on scope and finish level.
- Second-story additions run 20-30% more than ground-level additions due to structural work.
- Miami-Dade County permit requirements and hurricane codes add $5,000 to $18,000 versus less regulated markets.
- Mason Remodeling Co Miami provides a written price before any work begins, on every project, every time.
Home Addition Cost Breakdown (2026)
Here’s where the money goes on a typical Miami home addition. These ranges reflect what we’re seeing across the county in 2026, from Kendall to Coral Gables to North Miami Beach.
| Line Item | Typical Cost Range | What It Covers |
|---|---|---|
| Design & Architectural Plans | $3,500 – $12,000 | Drafting, structural engineering, Miami-Dade permit drawings |
| Permits & Impact Fees | $2,500 – $9,500 | Building permit, zoning review, school impact fees where applicable |
| Foundation & Slab Work | $8,000 – $28,000 | Miami’s high water table often requires additional compaction and waterproofing |
| Framing & Structural | $12,000 – $35,000 | Walls, roof tie-downs, hurricane strapping per Miami-Dade code |
| Roofing | $6,000 – $18,000 | Tie-in to existing roof, new underlayment, shingles or tile match |
| Electrical | $3,500 – $11,000 | New circuits, panel upgrade if needed, lighting, outlets |
| Plumbing | $2,500 – $10,000 | Supply lines, drains, fixture rough-in if adding a bath or wet bar |
| HVAC Extension | $2,000 – $8,500 | Ductwork extension or mini-split system for the new space |
| Windows & Exterior Doors | $4,000 – $16,000 | Impact-rated glazing required in Miami-Dade for most applications |
| Drywall, Insulation & Paint | $4,500 – $14,000 | Hanging, finishing, insulation per Florida energy code, paint |
| Flooring | $2,500 – $12,000 | Tile, hardwood, or LVP with moisture barriers for slab-on-grade |
| Finish Carpentry & Millwork | $2,500 – $10,000 | Baseboards, crown molding, door hardware, closet systems |
| General Contractor Overhead & Profit | 10-20% of total | Project management, scheduling, supervision, warranty coverage |
What moves these numbers up or down? Finish level is the biggest swing factor. Builder-grade flooring, stock cabinetry, and standard lighting keep you at the low end. Mid-range finishes from brands like Kohler, Moen, Cambria, and KraftMaid put you in the middle. If you’re specifying Silestone or Caesarstone countertops, custom cabinetry from Wellborn, or premium fixtures from Toto and Grohe, expect to land at the top of the range or above.
What Affects Home Addition Pricing in Miami
Miami isn’t like other markets. The factors below have a real effect on what you’ll pay, and most national cost guides don’t account for them.
- Hurricane code compliance. Miami-Dade County has the strictest wind-load requirements in the country. Impact windows, reinforced roof tie-downs, and stronger framing connections add $5,000 to $18,000 compared to building the same addition in, say, Tampa or Orlando. This isn’t optional. The permit office will not sign off without it.
- High water table and soil conditions. Much of Miami sits on porous limestone with a water table only a few feet down. Foundation work often requires additional compaction, moisture barriers, and sometimes engineered fill. In neighborhoods like Shenandoah or Little Havana where lots are older, soil conditions can add $3,000 to $10,000 to the foundation line item.
- Zoning setbacks and lot coverage rules. Miami and its surrounding cities, including Coral Gables, Hialeah, and Miami Beach, each enforce different setback and lot coverage limits. If your addition pushes against those limits, you may need a variance, which costs $1,500 to $5,000 in filing fees and engineering time, and adds weeks to the timeline.
- Second-story versus ground-level. Building up requires structural reinforcement of the existing first-floor walls and often a temporary roof removal. That reliably adds 20-30% to the total project cost. If your lot is small, as many are in Wynwood and Allapattah, going up may be your only option despite the premium.
- Material availability and delivery logistics. Miami’s traffic and tight streets add real cost to material deliveries. In neighborhoods like Coconut Grove with narrow roads and canopy trees, deliveries may require smaller trucks or permits, adding $500 to $3,000 in logistics costs.
- Finish level and fixture selection. This is the factor you control most directly. The difference between a stock vanity and a custom-built one, between commodity tile and large-format porcelain, between builder-grade windows and high-efficiency impact glass, can swing the project by $25,000 or more.
How Much Does a Home Addition Cost Per Square Foot in Miami?
For a standard ground-level addition with mid-range finishes, Miami homeowners should budget $180 to $280 per square foot. A second-story addition or a project with premium finishes runs $280 to $400 per square foot.
Those numbers include everything: permits, materials, labor, and general contractor overhead. A 400-square-foot primary suite addition at $220 per square foot lands around $88,000. The same square footage elevated to a second story with custom finishes could hit $140,000 or more.
For reference, home addition projects in Miami vary widely by neighborhood and scope. The ranges above reflect what we’ve priced across the county over the past several years.
Common Home Addition Projects and What They Cost in Miami
Bump-Out Addition
A bump-out extends an existing room by 2 to 4 feet, adding 40 to 120 square feet without requiring a new foundation pour on the same scale as a full addition. In Miami, expect to pay $12,000 to $35,000 for a bump-out with finished interior work. These are popular in older homes in the Roads and Silver Bluff neighborhoods where lot lines make full additions difficult.
Single-Room Addition
Adding one room, a bedroom, home office, or expanded living space, on a slab foundation with standard finishes runs $35,000 to $85,000 in Miami. That includes the roofline tie-in, which is often the trickiest part of matching an existing roof cleanly.
Primary Suite Addition
A bedroom and bathroom addition of 350 to 600 square feet typically costs $65,000 to $150,000. The bathroom is the cost driver here. Plumbing rough-in, waterproofing, tile work, and fixtures account for roughly a third of that total.
Second-Story Addition
Adding upward is the most expensive option per square foot. A 500-square-foot second-floor addition in Miami runs $110,000 to $200,000 when you include structural reinforcement, stair construction, and the temporary roof work required during the build.
In-Law Suite or Attached ADU
A small attached accessory dwelling unit with a kitchenette and bath typically falls between $90,000 and $180,000. Detached ADUs cost more. If you’re considering a separate structure, our home page covers the full scope of what Mason Remodeling handles.
Miami Permits and Code Requirements for Home Additions
Every home addition in Miami requires a building permit, and most require architectural drawings stamped by a Florida-licensed engineer. The Miami-Dade County building department reviews for wind load compliance, flood zone requirements, and zoning conformity. Permit fees for a typical addition run $2,500 to $9,500, including plan review and impact fees.
If your property sits in a FEMA-designated flood zone, which includes large portions of Miami Beach, Key Biscayne, and low-lying areas along the Miami River, you’ll likely need an elevation certificate and possibly floodproofing measures. That can add $3,000 to $12,000 to the project. These requirements are non-negotiable and enforced at inspection.
Mason Remodeling Co Miami handles the entire permit process for our clients. We submit the drawings, manage the review comments, and schedule the inspections. You should not have to learn the Miami-Dade building code to get your addition built. That’s our job.
How to Save on a Home Addition in Miami
Saving money on an addition doesn’t mean cutting corners. It means making deliberate choices about scope, materials, and timing before construction starts.
- Keep plumbing where it already is. If you’re adding a bathroom, placing it adjacent to existing plumbing lines can save $3,000 to $8,000 versus running new drain lines across the slab. In slab-on-grade construction, which is standard in Miami, moving a toilet location even ten feet can require breaking concrete and re-routing drainage.
- Build on the ground floor when possible. A single-story addition avoids the structural reinforcement and temporary roof work that second-story projects require. That alone can save $25,000 to $50,000 on a typical project.
- Choose mid-range finishes from established brands. You do not need custom cabinets to get a durable, attractive result. Stock and semi-custom lines from KraftMaid and Wellborn, paired with Cambria or Silestone surfaces and Moen or Kohler fixtures, deliver a high-end look at a predictable price.
- Lock in materials pricing before you start. Miami’s construction market stays busy year-round, and material prices shift. We order major items such as windows, doors, and cabinetry as soon as your plans are approved, which protects you from mid-project price increases.
- Get the full price in writing before work begins. The most expensive additions are the ones where the price changes halfway through. At Mason Remodeling Co Miami, every project receives a written price before any work starts. No surprise invoices. No verbal estimates that grow on the final bill. Call (850) 780-8123 and we’ll walk you through the numbers for your specific property.
Why Homeowners in Miami Choose Mason Remodeling for Additions
An addition means strangers in and around your home for weeks or months. We take that seriously. Mason Remodeling has provided general contracting, bathroom remodeling, and whole-home remodeling services since our founding in 2004, operating as part of the Threshold Group family of home-service companies. Every Mason Remodeling location is independently owned and operated and holds to Threshold Verified standards on every job.
Here’s what that means for you, specifically. Every crew member who works on your addition is background-checked and identity-verified under The Threshold Standard. Before anyone arrives at your door, you receive their name and photo. When they show up, they’re in a clean marked uniform and carrying a photo ID badge. If you are home alone or have young children, you know exactly who is walking up your driveway before they ring the bell.
Isaac Pruett leads Mason Remodeling Co Miami. He has built this location around a simple promise: a written price on every project before a single tool is unpacked, and a written guarantee covering what is included, what is excluded, and for how long. Specifically, our 365-Day Done Right Promise means if the work is not right within a year of completion, we make it right at no cost to you. That covers general contracting, bathroom remodeling, and whole-home remodels, including additions.
A live person answers our phone 24 hours a day, 7 days a week. No call trees. No voicemail loops. Call (850) 780-8123 at 2 p.m. or 2 a.m. and you’ll speak with a person.
FAQs – Home Addition Cost in Miami
How much does a home addition cost in Miami in 2026?
A home addition in Miami costs $53,100 to $153,400 on average in 2026, with most projects landing between $80,000 and $120,000. Your specific price depends on square footage, whether you’re building out or up, and the finish level you choose. Call (850) 780-8123 for a free written estimate tailored to your property.
Is it cheaper to build up or out in Miami?
Building out, meaning a ground-level addition, is almost always cheaper. A single-story addition runs $180 to $280 per square foot, while a second-story addition runs $280 to $400 per square foot because of the structural reinforcement and temporary roof work required. That said, many Miami lots are too small to build out within zoning limits, which is why second-story additions remain common in older neighborhoods.
How long does a home addition take in Miami?
A single-room addition typically takes 4 to 7 months from permit submission to final inspection in Miami-Dade County. Second-story additions and larger multi-room projects run 7 to 12 months. The permitting phase alone often takes 4 to 10 weeks depending on review queue volume and whether variances are required.
Do I need a permit for a home addition in Miami?
Yes. Every home addition in Miami-Dade County requires a building permit, and most require engineered drawings stamped by a Florida-licensed professional. Permit fees and impact fees typically total $2,500 to $9,500 for a standard addition. Building without a permit risks fines, stop-work orders, and complications when you eventually sell the home.
What is the cheapest type of home addition in Miami?
A bump-out addition, which extends an existing room by 2 to 4 feet without major foundation work, is the cheapest option at $12,000 to $35,000. It adds usable square footage without the full cost of a new foundation, roofline reconfiguration, and separate HVAC zone that a full addition requires.
Will a home addition increase my property taxes in Miami?
Yes, but not immediately. Once your addition is complete and the county assessor records the new square footage, your assessed value will increase. In Miami-Dade County, the Save Our Homes cap limits annual assessment increases to 3% for homesteaded properties, which softens the tax impact. A 400-square-foot addition might increase your taxable value by $80,000 to $160,000 depending on location and finish level.
Get a Written Price for Your Miami Home Addition
The best way to know what your addition will cost is to have a professional walk the property and put numbers on paper. Mason Remodeling Co Miami provides free estimates with a written price on every project, delivered before any work starts. You’ll know the total, the scope, and the timeline before you sign anything.
Call (850) 780-8123 to schedule your estimate. A live person answers, 24 hours a day, 7 days a week, including weekends and holidays. We’ll verify your appointment, introduce your estimator by name and photo before the visit, and give you a price you can plan around.
Pricing reflects the Miami market as of 2026. Mason Remodeling Co Miami offers free estimates – call (850) 780-8123.
Written by Isaac Pruett, Owner at Mason Remodeling Co Miami, serving Miami since 2004.
What Our Customers Say
"Bathroom gut job. Replaced the old tub with a walk-in shower and added a niche. Waterproofing was done properly with a flood test before tile."
- Greg L."Opened up the wall between kitchen and dining room. They handled the beam and permit and the floor transitions look seamless."
- Wendy A."Written scope, fixed price, and weekly updates. No change orders we hadn't agreed to."
- Carlos H.
