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 South Miami
Home additions and ADU construction in South Miami typically run $53,100-$153,400 for room additions and $106,200-$259,600 for detached ADUs, with permits pulled through the city’s independent building department on Sunset Drive rather than Miami-Dade County. We’re the Home Additions & ADU team at Rowan Construction Group Miami, and we coordinate dispatch and scheduling from our South Florida office to serve South Miami homeowners directly. Call (786) 321-4970 to schedule your free estimate.
Why Rowan Construction Group Miami Is South Miami’s Preferred Home Additions & ADU Company
We’ve delivered 4,000-plus projects since 2007, every one with a written price before work started and a documented photo record when the crew left. South Miami homeowners find us because they read the three-star reviews and want a contractor who puts the number in writing before anyone picks up a tool.
Our crews know the difference between a county permit and a city permit. South Miami is independently incorporated with its own building department entirely separate from Miami-Dade County, and contractors who regularly work unincorporated areas often submit to the wrong office. We don’t. Our documented record includes permits pulled and inspections passed through City Hall on Sunset Drive, not rerouted applications.
A live person answers our calls 24/7. Background-checked, uniformed technicians arrive with a photo record of every visit included as standard. The 365-Day Done Right Promise, backed by The Haven Standard, is printed on every page, not hidden behind an asterisk.
Grant Rowan has built this discipline since founding the company in 2007: no change proceeds without a signed change order. That’s why projects finish within a few percent of the agreed price.
Our Home Additions & ADU Services in South Miami
ADU Design & Permitting
Every South Miami ADU starts with a permit path through the city’s building department on Sunset Drive, not Miami-Dade County. We run the site plan against city setback rules, which differ from county standards. A detached ADU on an oversized lot off Red Road needs 7-foot side setbacks, not the 5 feet the county might allow. Our design package includes the grading and drainage plan, HVHZ-compliant impact window and door schedule, and structural calculations for Miami-Dade’s High-Velocity Hurricane Zone. Under Clause 1 of The Haven Standard, you receive a written flat price before any work starts.
Garage Conversion ADU
Converting a garage in South Miami means dealing with original construction from the 1950s-70s. Most garages have non-impact doors, single-pane windows, and flat roofs with failing membranes from decades of subtropical humidity. The conversion triggers HVHZ opening-protection upgrades on the entire home envelope, not just the new unit. We scope this upfront. A garage conversion ADU in South Miami runs $35,400-$94,400, including the full envelope replacement when required.
New Detached ADU
This is where South Miami’s independent building department matters most. A new detached ADU on a large lot needs city permits, city inspections, and city-specific setback compliance. We pulled a permit for a detached ADU on an oversized lot near the intersection of SW 62nd Avenue and SW 80th Street, but the city’s plan reviewer flagged our site plan because we’d left only a 5-foot side setback instead of the required 7 feet. Something the county would never have caught. We reworked the grading and drainage plan to shed water toward the swale, added Miami-Dade HVHZ-compliant impact windows and doors to the scope of work, and resubmitted. After inspection sign-off, the homeowner had a 600-square-foot ADU with a full rough-in for a future outdoor kitchen, all done without a single change order.
Junior ADU & Interior Conversion
Junior ADUs in South Miami often come from splitting a 1960s CBS ranch, which means working within existing walls that predate modern insulation and electrical codes. The junior unit needs separate utility metering or a clear shared-utility agreement, plus egress windows that meet current HVHZ standards. We identify these requirements during the initial scope, not after demolition starts.
ADU Site Prep & Utilities
Open lots in South Miami need site-specific grading and drainage plans. The subtropical humidity and seasonal heavy rainfall mean standing water against a new slab will fail inspection. We run the topography, identify the swale direction, and scope the utility trenching for water, sewer, or septic connections before quoting. This is not an add-on. It is part of the written price.
Room Additions & Second Story Additions
Adding square footage to a 1950s-70s CBS ranch in South Miami means tying new construction to old structure under the strictest residential building standards in the United States. Second story additions add wind-load requirements that the original single-story frame was never designed for. We engineer for this. The foundation often needs reinforcement, and the roofline change triggers full HVHZ envelope upgrades. We scope it all in the initial written quote.
Sunrooms & Enclosed Patios
Enclosing a patio in South Miami requires impact-rated glazing and HVHZ-compliant roof assemblies. The original patio slab may not meet current flood-elevation or load-bearing standards. We test and specify before work begins.
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 South Miami
We source across fifty-plus vetted brands, giving the written quote honest numbers rather than inflated ones. For South Miami’s HVHZ requirements, we regularly specify PGT and CGI impact windows and doors, both Miami-Dade approved for the strictest wind-load zone in the country. CWS impact-rated products also appear in our ADU and addition packages when the design calls for specific sightlines or operating styles. We stock local access to these brands, which reduces lead time on a market where HVHZ-compliant materials can add weeks to delivery schedules. The quote names the manufacturer and the model, not a generic description.
Common Home Additions & ADU Problems We See in South Miami Homes
- Permits submitted to Miami-Dade County instead of the City of South Miami. Contractors accustomed to unincorporated work file with the county, stall for weeks, then discover the city requires a complete re-review. We pull directly through City Hall on Sunset Drive from day one.
- HVHZ envelope upgrades triggered mid-project on 1960s CBS ranches. Non-impact windows, jalousie glass, and original garage doors force a full replacement once the addition connects to the existing structure. We identify these during the initial site visit and include them in the written scope.
- Failed grading and drainage on open lots. Without a site-specific plan, water pools against the new slab and the foundation inspection fails. We engineer the swale direction and slab elevation before breaking ground.
- Stucco delamination and wood-fascia rot hidden until demo. South Miami’s year-round subtropical humidity accelerates deterioration on mid-century homes. Our documented photo record captures existing conditions before work starts, so there are no surprises and no unscoped change orders.
Pricing for Home Additions & ADU in South Miami, FL
A typical home addition in South Miami runs $53,100-$153,400. ADU construction runs $106,200-$259,600. Garage conversions, which often include envelope upgrades on the main house, run $35,400-$94,400. Impact window installation, frequently required as part of the scope, adds $9,440-$29,500.
| Service | Price Range in South Miami |
|---|---|
| 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 |
What moves the number: lot size and setback requirements, existing envelope condition, HVHZ material specifications, grading and drainage complexity, and utility connection distance. We scope every variable before quoting. Under Clause 1 of The Haven Standard, the written price is delivered before any work starts. No exceptions. Bring a competitor’s written estimate and we’ll review it line by line at no charge. Call (786) 321-4970 for your free estimate.
We Also Serve Cities Near South Miami
Our crews work throughout the metro, including Home Additions & ADU in South Miami proper as well as Miami, Brownsville, Miami Beach, and Miami Springs. Each municipality has its own permitting path and building department procedures. We know which office handles which address.
Serving South Miami, FL - Our Local Coverage Area
We’re based in the South Miami 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 South Miami
The City of South Miami. South Miami is independently incorporated and runs its own building department entirely separate from Miami-Dade County. All ADU permits must be submitted to City Hall on Sunset Drive, SW 72nd Street. Contractors who file with the county face delays and a complete re-review. Call (786) 321-4970 and we’ll confirm the correct permitting path for your specific address.
Nearly always yes. South Miami sits within Miami-Dade’s High-Velocity Hurricane Zone, the strictest residential building standard in the United States. Any structural renovation that ties into the existing envelope triggers mandatory opening-protection upgrades. Original jalousie windows, single-pane glass, and non-impact garage doors must be replaced with HVHZ-compliant products. We identify these requirements during our initial site visit and include them in the written scope, not as a mid-project surprise. Call (786) 321-4970 for an exact quote.
We run a site-specific survey against Florida Department of Health setback rules and the City of South Miami’s zoning requirements before finalizing the ADU placement. Septic tanks need minimum distances from structures and property lines; wells need additional separation. The grading and drainage plan must direct water away from both. These constraints often determine the buildable footprint more than the lot size itself. We engineer around them in the design phase. Call (786) 321-4970 to review your site conditions.
Unscoped conditions discovered after work starts: hidden stucco delamination, rotted fascia behind intact paint, or non-compliant existing electrical panels. We prevent these with a thorough pre-construction inspection and documented photo record. Under The Haven Standard, no work proceeds on a change until the change order is signed. Our discipline has kept projects within a few percent of the agreed price across 4,000-plus jobs. Call (786) 321-4970 for a written scope that accounts for what we can see and what we plan for.
Typically 6-10 weeks for a complete submission through the City of South Miami’s building department, assuming no revisions. Incomplete applications or plans that don’t account for city-specific setbacks trigger delays. We submit complete packages: structural calculations, HVHZ product approvals, grading and drainage plans, and energy compliance documentation. A clean first submission moves faster. Call (786) 321-4970 to start the pre-application review.
Ready to add square footage or build an ADU? Call (786) 321-4970 to schedule your free estimate. We’ll review your site, confirm the permitting path through the City of South Miami, and deliver a written flat price with a written scope before any work starts. That’s Clause 1 of The Haven Standard, and it’s how we’ve operated since 2007.
Written by Grant Rowan, Owner at Rowan Construction Group, serving South Miami since 2007.