Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Miami Gardens
Home additions and ADU construction in Miami Gardens typically run $53,100-$153,400 for room additions and second-story expansions, while detached ADUs fall between $106,200-$259,600. Most projects take 8-16 weeks from permit to final inspection, though garage conversions can finish faster since the envelope already exists. Call (786) 321-4970 to schedule your free estimate - we’ll deliver a written price before any work starts.
We dispatch crews to Miami Gardens from our South Florida office daily. The city’s grid of 1950s-1970s CBS ranch homes, built before Hurricane Andrew and Florida’s modern building codes, means every addition or ADU here must meet Miami-Dade County’s High-Velocity Hurricane Zone standards. That’s not bureaucracy. It’s the difference between a project that passes inspection and one that gets red-tagged at rough-in.
Our Home Additions & ADU team has worked across Carol City, Norland, and the Bunche Park sections of Miami Gardens. We know the local inspector rotations, the NOA product-approval database, and the specific failure modes that salt air and summer flooding introduce to active jobsites here.
Why Rowan Construction Group Miami Is Miami Gardens’s Preferred Home Additions & ADU Company
We’ve delivered over 4,000 projects since 2007, every one with a written price before work started and a documented photo record when the crew left. In Miami Gardens, that discipline matters more than most places. The housing stock is older. The code is stricter. The inspector will reject a Broward-approved product sheet without a second glance.
Our crews are background-checked and uniformed. A live person answers calls 24/7. And under Clause 1 of The Haven Standard, the price you sign is the price you pay - no change proceeds without a signed change order, which is why our projects finish within a few percent of the agreed number.
We also offer a Free Second Opinion on any written estimate. Bring a competitor’s quote and we’ll review it line by line at no charge. In Miami Gardens, where NOA compliance and salt-air specs can inflate or deflate a bid by tens of thousands, that second look often reveals material substitutions the homeowner missed.
Our Home Additions & ADU Services in Miami Gardens
ADU Design & Permitting
ADU permitting in Miami Gardens moves through Miami-Dade County’s building department, not a municipal office. We handle the site plan, the structural drawings, and the NOA product schedules as part of our flat written quote. Most detached ADUs here require utility trenching across flat, poorly drained lots - we factor that into the timeline upfront, not as a surprise change order when the backhoe hits standing water in August.
Garage Conversion ADU
Garage conversions in Miami Gardens run $35,400-$94,400, making them the most cost-effective ADU path for homeowners with existing CBS block structures. The catch: most pre-Andrew garages lack the slab reinforcement, ceiling height, and electrical service for habitable space. We open with a structural assessment and a written scope that names every upgrade required - panel replacement, supply-line rerouting, impact-rated garage door conversion to egress window - so the price reflects reality.
New Detached ADU
A new detached ADU in Miami Gardens starts with a site that floods. The low, flat terrain and limited natural drainage mean summer thunderstorms regularly pool on active jobsites, delaying concrete pours and foundation work. We schedule exterior phases for the drier months and specify elevated stem-wall foundations with integrated drainage where code allows. Every window, door, and roofing system carries a Miami-Dade NOA number - not a Florida Product Approval - because the inspector here will reject anything less.
Junior ADU & Interior Conversion
Junior ADUs work in Miami Gardens when the existing home has sufficient electrical service and separate exterior access. Most 1950s-1970s CBS ranches here have 60-100 amp Federal Pacific or Zinsco panels that cannot handle additional load. We identify that condition during the first site visit and include panel upgrade and supply-line replacement in the written quote, not as a mid-project discovery.
Room Additions
Room additions on single-story CBS ranches in Miami Gardens often trigger roof-tie-in challenges. The original built-up tar-and-gravel or low-slope roofs are past serviceable life, and Florida’s insurance crisis has made roof age a cancellation trigger. We spec GAF or Owens Corning roofing systems with Miami-Dade NOA approval and stainless-steel fasteners rated for the salt-air regime, not standard galvanized hardware that corrodes within a few years.
Second Story Additions
Second-story additions in Miami Gardens require structural verification that the existing CBS walls and foundation can handle the load. Many pre-Andrew homes here were built with minimal rebar and shallow footings. Our engineer assesses bearing capacity before we quote, and we include any required foundation underpinning or wall reinforcement in the flat written price.
ADU Site Prep & Utilities
Utility trenching in Miami Gardens crosses flat terrain with high water tables. We coordinate with Miami-Dade Water and Sewer for tap permits and spec backflow prevention where required. The photo record we deliver documents every trench depth, every pipe bed, and every compaction test - included as standard, not an upgrade.
Sunrooms & Enclosed Patios
Sunroom enclosures in Miami Gardens must meet HVHZ wind-load requirements and use NOA-approved impact glazing. We specify aluminum frames with thermal breaks and stainless-steel fasteners, not the painted steel hardware that salt air destroys. The price difference between coastal-spec and inland-spec hardware is real, but so is the cost of replacing corroded fasteners in five years.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in Miami Gardens
We source across fifty-plus vetted brands, giving the written quote honest numbers rather than inflated ones. For additions and ADUs in Miami Gardens, we regularly specify GAF and Owens Corning roofing systems with Miami-Dade NOA approval, CertainTeed siding and trim where the addition envelope requires it, and IKO underlayment products for secondary water barriers. Every material carries a traceable NOA number that the inspector can verify against the county database. We don’t grab substitutes from the truck. Under The Haven Standard, the spec sheet in the permit set is the spec sheet on the jobsite.
Common Home Additions & ADU Problems We See in Miami Gardens Homes
- Non-NOA materials specified from Broward County bid sheets. A Florida Product Approval that passed inspection in Miramar or Pembroke Pines will be rejected by a Miami-Dade inspector. We see this on competitor bids regularly. The homeowner doesn’t learn until rough-in fails and the change order arrives.
- Standard galvanized or painted steel fasteners on exterior assemblies. Salt air in Miami Gardens corrodes them within a few years. Worse, the Miami-Dade NOA approval for the window or roofing system may not even cover the substitute fastener the crew grabbed from the truck. We spec stainless-steel or hot-dip galvanized hardware that matches the NOA submittal exactly.
- Original Federal Pacific or Zinsco panels left in service. When walls open for an addition, the 60-100 amp panel and galvanized supply lines must upgrade to current Miami-Dade code. Skipping this leaves new square footage under-served and the rough-in unable to pass electrical inspection.
- Summer flooding on active jobsites. Miami Gardens’ low elevation and limited drainage mean afternoon thunderstorms pool water where concrete was supposed to cure. We schedule around the wet season and specify elevated foundations with integrated drainage where the site allows.
Pricing for Home Additions & ADU in Miami Gardens, FL
These are the ranges we deliver in writing before any work starts. Under Clause 1 of The Haven Standard, “call for a quote” is not an option here.
| Service | Price Range in Miami Gardens |
|---|---|
| Home Addition | $53,100 - $153,400 |
| ADU Construction | $106,200 - $259,600 |
| Garage Conversion | $35,400 - $94,400 |
| Impact Window Installation | $9,440 - $29,500 |
| Metal Roof Installation | $17,700 - $47,200 |
| Roof Replacement | $9,440 - $23,600 |
What moves a project within these ranges? Foundation type, NOA product tier, electrical upgrade scope, and site drainage conditions. A detached ADU on a flat lot with poor drainage requires more site prep than one on higher ground near Hard Rock Stadium. We name every variable in the written scope so you can screenshot the number and compare it apples-to-apples.
Call (786) 321-4970 for your free estimate. We’ll review your site, your existing conditions, and your permit path, then deliver a flat written price with no obligation.
We Also Serve Cities Near Miami Gardens
Our crews work throughout Miami-Dade County and into southern Broward. We regularly build Home Additions & ADU in Miami Gardens and also serve Hialeah, North Miami Beach, Miami, and Miami Beach. The NOA requirements differ across the county line, so we maintain separate product schedules and inspector relationships for each jurisdiction.
Serving Miami Gardens, FL - Our Local Coverage Area
We’re based in the Miami Gardens area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Miami Gardens
Yes. Miami-Dade County requires Miami-Dade NOA numbers for every impact window, exterior door, and roofing system installed here. A Florida Product Approval that passed inspection in Broward County one mile north will be rejected by a Miami-Dade inspector. On a detached ADU we built in the Carol City section of Miami Gardens, the owner had first received a bid using a Broward-approved impact window line; our crew flagged that the windows lacked a Miami-Dade NOA number, and the inspector rejected them at rough-in. We re-specced the openings to a Miami-Dade NOA-listed aluminum frame with stainless-steel fasteners and sealed the jamb joints against the salt-air corrosion regime, then moved the re-inspection through to sign-off. The punch list on that job was shorter than the original permit set because the window spec changed before the stucco went on. Call (786) 321-4970 and we’ll verify NOA compliance on every product in your quote - estimates are free.
We routinely encounter three conditions: undersized electrical panels (60-100 amp Federal Pacific or Zinsco), galvanized supply lines, and single-pane jalousie windows. All require upgrading to meet current Miami-Dade code. The panel replacement alone can add $3,000-$6,000 to the project, but skipping it leaves the new square footage under-served and the rough-in unable to pass inspection. We identify these conditions during the first site visit and include upgrades in the written quote, not as mid-project surprises. Call (786) 321-4970 for a free assessment of your existing conditions.
The price gap comes down to fasteners, finishes, and product approvals. Salt air in Miami Gardens corrodes standard galvanized or painted steel hardware within a few years. Coastal-spec means stainless-steel or hot-dip galvanized fasteners, marine-grade aluminum window frames, and sealed paver joints - all matched to Miami-Dade NOA submittals. The inland spec saves money upfront. The coastal spec costs less over a decade because nothing rots out. We quote both ways when asked, but we warranty the coastal-spec work under our 365-Day Done Right Promise. Call (786) 321-4970 and we’ll walk through the material schedule line by line.
Miami Gardens sits at roughly 3-8 feet above sea level with limited natural drainage. Summer afternoon thunderstorms, averaging over 60 inches of annual rainfall, regularly flood active jobsites and delay concrete pours, foundation work, and exterior framing. We compress productive exterior hours into the drier months and specify elevated stem-wall foundations with integrated drainage where code allows. The written timeline we deliver accounts for seasonal conditions, not ideal-weather fantasy. Call (786) 321-4970 and we’ll review realistic scheduling for your site.
Four documents: a flat written price with line-item scope, a product schedule with Miami-Dade NOA numbers for every impact-rated component, a signed change-order policy, and a written warranty. Under The Haven Standard, Clause 1 requires the price in writing before anyone starts. Clause 2 requires signed authorization for any change. The photo record we deliver at project close documents what was found and what was done. No handshake guarantees, no asterisks. Call (786) 321-4970 and we’ll deliver all four before you sign.
Ready to price your project? Call (786) 321-4970 to schedule your free estimate. We’ll assess your site, verify your existing conditions, and deliver a flat written price with Miami-Dade NOA-compliant product schedules - before anyone picks up a tool.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Miami Gardens since 2007.