Home additions · Miami-Dade, Broward, Palm Beach
Turnkey home additions in Miami-Dade, Broward and Palm Beach. Cost plus a fixed fee, a maximum price in the contract, and four payments tied to project stages.
Home additions
Florida Home Build builds home additions in Miami-Dade, Broward and Palm Beach as turnkey projects: a new wing, a second floor, or an addition that comes with a renovation of the rest of the house. You sign one contract, it carries a maximum price, and projects start at $250,000.
Expanding a house means the added space has to tie into the old foundation, roof, electrical panel and air conditioning, and it has to pass the same inspections as the rest of the home.
Our home addition services cover all of it under one contract:
Every project starts with a visit to your property, before any contract. After it you get a line-by-line estimate.
Your money
At signing, at the start of work, at the midpoint and at about 99% completion. Each payment is for a stage you have approved.
Cost plus a fixed fee, with a maximum price. Savings stay with you. Anything above the cap is paid by the builder.
A shared budget tracker shows each subcontractor bid, each change and each invoice.
The same permanent subcontractors on every job, and one company answering for all of them.
The warranty term is a number in your contract, and so is the list of what it does not cover.
By phone, WhatsApp, text or email, in English, Spanish or Russian.
Cost
Miami contractors quote home additions per square foot of new space, and two of them publish about $300–550 per sq ft for 2026. That is what contractors publish, not our quote. Your number comes after we see the house and the plans.
| Type of addition | What you get | Published range, one Miami contractor, 2026 | What moves the price |
|---|---|---|---|
| Room or wing at ground level | A bedroom suite with a bathroom, a family room, or a kitchen and living wing | $150,000–450,000 for a room addition | Foundation, electrical panel, a second A/C system, the roof tie-in |
| Second story | A new floor over the existing rooms | $300,000–800,000+ | Strengthening the first floor ($40,000–120,000 in the same estimates), the stairs, hurricane-code windows |
| Florida room or enclosed porch | A bright room off the back of the house | Set after we see the plans | The slab, glass and doors, and whether it is air-conditioned living space |
| Garage turned into a room | A bedroom, office or laundry room in the old garage | Set after we see the plans | Air conditioning, wall and floor finishes, the former garage door opening |
| Addition with a whole-house renovation | A new wing and updated old rooms under one contract | Renovation part, market figure: $50–250 per sq ft, most often $75–150 | The scope of the renovation and the finishes you pick |
Check early
Two line items are worth checking early. One Miami contractor estimates a new 200-amp electrical panel at $4,000–8,000, plus $3,000–6,000 for the utility side, and a second air-conditioning system at $8,000–18,000.
One contract
As on our other projects, architect and designer fees, permits and surveys are priced separately from construction. We act as your general contractor on the whole job, so the addition and the work on the old rooms share one contract.
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Permits
Every home addition in Miami-Dade needs a building permit, and the permit comes with three sets of rules that shape the design: zoning, FEMA flood maps and the hurricane code. As your home addition contractor, we handle the applications and inspections.
Complex projects can require plans signed and sealed by an architect or engineer, and the zoning review checks setbacks, height and landscaping. In most cities the city's own building department issues the permit, and in unincorporated areas the county does. If your community has a homeowners' association, we prepare its submission too.
Zoning decides how much you can build. In unincorporated Miami-Dade's RU-1 single-family district, for example, a lot is at least 7,500 sq ft and buildings can cover up to 40% of it. Local regulations and local building codes differ by city, and individual lots can be stricter, so the limits of your own lot set the size of the addition.
In a FEMA flood zone, work that costs 50% or more of the market value of the house itself, land excluded, counts as a substantial improvement. The new part always has to meet flood rules. For a ground-level wing that leaves the old house mostly alone, that generally means raising only the new part. A second story, a removed shared wall or a V zone can bring the whole house up to current flood rules, and local rules can be stricter. The city or county runs the calculation. Our whole-house renovation cost guide covers the rule in more depth.
Miami-Dade and Broward sit in the High-Velocity Hurricane Zone of the Florida Building Code. The windows, doors, shutters and roofing materials of the new space need county product approval, and the approval goes in with the permit application. In Miami-Dade, applications filed on or after December 31, 2026 follow the 9th edition of the code, which matters if your design is still in progress. More in our guide to hurricane-resistant homes.
After the keys
The term and the list of exclusions are written in your contract, not explained later.
As-built drawings, manuals, a maintenance schedule and manufacturer warranties registered in your name.
We walk the house with you and show how each system works before you move in.
Home maintenance by arrangement, with the same team that built it.
FAQ
Our turnkey projects start at $250,000, with a maximum price in the contract. For comparison, two Miami contractors publish about $300–550 per sq ft of new space, and one lists $150,000–450,000 for a room and $300,000–800,000+ for a second story. Those are not our quote. We price your addition after we see the house and the plans. Every type is in the table above.
One Miami contractor's published totals are higher for a second story than for a ground-level room, though the areas differ. Part of the gap is that the first floor may need strengthening. A ground-level wing needs room on the lot after setbacks and lot coverage. Your lot and the structure of your house decide it.
An engineer has to confirm that the foundation and walls can carry another floor, and the new floor has to meet the hurricane code. We build second floors as part of turnkey projects that start at $250,000.
A building permit from your city or, in unincorporated areas, the county, with signed and sealed plans when the project is complex. We handle the applications, the association submission if you have one, and every inspection.
In a FEMA flood zone, an addition that costs 50% or more of the house's market value, land excluded, is a substantial improvement, and the city or county runs the calculation. Our renovation cost guide covers the rule in more depth.
One Miami contractor publishes about 7–11 months for a room addition and 9–15 months for a second story. That is not a promise from us. Dates for your project are estimates: permit queues, inspections and rain move them, and you see every change in your client portal that week.
You pay in four steps: at signing, at the start of work, at the midpoint and at about 99% completion, with the shares set in your contract. The contract is cost plus a fixed fee with a maximum price, and we pay anything above it.
Yes. A garage turned into living space is one more way to add rooms, and we build it as part of a turnkey project from $250,000. Miami rules, costs and steps are on our garage conversion page.
