Fast, Reliable Home Additions & ADU Across Ojus
Home additions and ADU construction in Ojus typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached units, with most projects taking 4-8 months from permit to final inspection. Because Ojus sits in unincorporated Miami-Dade County, every permit pulls through the county Building Department, and every material must carry a Miami-Dade Notice of Acceptance for the High-Velocity Hurricane Zone. Call (844) 665-0162 to schedule a free estimate.
Why Groundwork Construction Co. of Miami Is Ojus’s Preferred Home Additions & ADU Company
We’ve built and converted additions across the 33160 ZIP code for years, from the concrete-block ranches along NE 183rd Street to the mid-century homes near Greynolds Park. Ojus homeowners know our trucks. They also know we don’t hand projects off to subs we’ve never met - our Home Additions & ADU team manages every phase in-house.
Raymond Estevez, who leads Groundwork, personally reviews every Ojus project plan before it hits the county permit desk. That matters here. Ojus’s unincorporated status means no city building department to call for clarification - you’re in the county queue with every other Miami-Dade project, and a misfiled application costs weeks. We’ve learned the exact plan-review contacts, the fee schedule quirks, and which HVHZ product approvals inspectors flag most often.
Our response time to Ojus averages under 40 minutes. Same-day consultations happen regularly. We bring the full Groundwork capability - kitchen and bath finishing, roofing, windows, hardscaping - so your addition doesn’t end with framed walls and unfinished choices.
Our Home Additions & ADU Services in Ojus
ADU Design & Permitting
Every Ojus ADU starts with county-level permit strategy, not just pretty drawings. Because Ojus is unincorporated, we file directly with Miami-Dade Building Department, navigating the HVHZ structural and impact-resistance requirements that don’t apply just north in Broward County. We handle NOA verification for every window, door, and roofing product before plans submit - no surprises at inspection. Our design team works with your lot coverage, setback, and utility constraints, common concerns on the smaller 7,500-square-foot lots typical of eastern Ojus.
Garage Conversion ADU
Garage conversions in Ojus run $30,000-$80,000, making them one of the faster paths to rental income or multigenerational space. Most Ojus garages are attached, single-car structures from the 1960s-70s with flat roofs and minimal insulation. We reframe for living space, upgrade electrical to support HVAC and kitchen loads, and replace any non-impact openings with NOA-certified windows and doors. The existing slab usually needs moisture mitigation - Miami limestone and shallow groundwater mean vapor barriers and perimeter drainage get skipped by contractors who don’t know local conditions.
New Detached ADU
Detached ADUs in Ojus face the full county permitting path: site plan, foundation engineering for limestone substrate, HVHZ structural design, and utility tie-ins. We offer two build paths. Traditional stick-built construction gives maximum design flexibility. Or we partner with prefab innovators - Abodu, Dvele, Mighty Buildings, Boxabl, Plant Prefab - for factory-built units that cut on-site time and weather exposure. Either way, we handle site prep, including rock cutting and dewatering when the excavation hits that familiar Ojus water table.
Junior ADU & Interior Conversion
Junior ADUs convert existing interior space - often a master suite wing, attached carport, or oversized utility room - into independent living quarters with a kitchenette and exterior entrance. In Ojus’s older ranches, we see this work beautifully with 1960s floor plans that have redundant space. On a 1960s concrete-block ranch on NE 183rd Street, our crew converted a carport into a junior ADU. We had to cut through Miami limestone with a rock saw and run dewatering pumps around the clock because the water table sits just a few feet down. The homeowner’s old jalousie windows - original to the house - were replaced with impact-rated units carrying a Miami-Dade NOA, and the new mini-split was wired off a new subpanel, bringing the whole structure up to current HVHZ code.
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.
Trusted Brands We Service in Ojus
Groundwork works with 50+ recognized brands across every project phase, and you choose what fits your budget and taste - not what’s convenient for our purchasing. For kitchen and bath finishes in Ojus ADUs, that means cabinetry from KraftMaid and Wellborn, countertops in Cambria, Silestone, or Caesarstone engineered quartz, and fixtures from Kohler and Moen. Windows and doors draw from Andersen, Pella, Marvin, Milgard, Jeld-Wen, Simonton, PGT, and CGI - critical here because only specific product lines carry the Miami-Dade NOA required in Ojus. We stock no inventory; every product is ordered to spec for your project, delivered direct to site. This keeps turnaround tight and eliminates the “good enough” substitutions that derail timelines.
Common Home Additions & ADU Problems We See in Ojus Homes
- Contractors from Broward County use materials without a Miami-Dade NOA, failing inspection in Ojus. A window or door assembly approved for Miami or Hallandale Beach often lacks the county-specific certification required here. We verify NOA status before ordering anything.
- Excavation hits limestone or groundwater, stalling projects without rock-cutting and dewatering equipment. Miami Limestone sits 1-3 feet below grade across Ojus. General earthwork contractors from Central Florida arrive unprepared. We spec rock saws and dewatering pumps from day one.
- Permits are mis-filed with the county because Ojus is unincorporated, causing delays and rework. Contractors accustomed to city building departments in Aventura or North Miami Beach file incorrectly, underpay fees, or miss HVHZ plan-review triggers. We know the county workflow.
- Original jalousie and single-pane aluminum windows trigger full envelope upgrades during permitted work. Any Ojus renovation touching structural or envelope elements must bring the whole structure to current impact-resistance and wind-load standards. We engineer for this upfront, not discover it at rough inspection.
Pricing for Home Additions & ADU in Ojus, FL
These are the ranges we see on actual Ojus projects, accounting for HVHZ materials, county permitting, and local site conditions:
| Service | Typical Range in Ojus |
|---|---|
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
| Home Addition | $45,000-$130,000 |
| Impact Window Installation | $8,000-$25,000 |
What moves you within these ranges? Size and complexity first. A 400-square-foot garage conversion with existing utilities stays toward the lower end. A 900-square-foot detached ADU with full kitchen, new electrical service, and rock excavation pushes higher. Material selection matters - Caesarstone versus basic laminate, or PGT impact windows versus standard vinyl, shifts numbers. And site conditions: that shallow water table and limestone we keep mentioning? It adds dewatering and rock-cutting costs that don’t exist on sandier sites elsewhere in Florida.
We don’t quote over email. Every Ojus site has variables - utility locations, setback measurements, existing structure condition - that require eyes on property. Call (844) 665-0162 for a free, no-obligation estimate. We’ll walk your lot, flag the county-specific requirements, and give you a line-item proposal.
We Also Serve Cities Near Ojus
Our crews work throughout northeast Miami-Dade and southern Broward, including Ojus neighbors: North Miami Beach to the south, Sunny Isles Beach to the southeast, Aventura to the north, and Hallandale Beach just across the county line. Each municipality has distinct permitting - Aventura runs its own building department, Hallandale Beach operates under Broward County’s less stringent product rules - and we maintain separate workflow knowledge for each. One contractor, every jurisdiction.
Serving Ojus, FL - Our Local Coverage Area
We’re based in the Ojus 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 Ojus
Yes. Every window, door, and structural fastener in Ojus must carry a Miami-Dade Notice of Acceptance because the area sits in the High-Velocity Hurricane Zone. This is stricter than Florida state approval and does not apply in Broward County just to the north. We verify NOA status for every product before it reaches your site - call (844) 665-0162 and we’ll review your specific openings.
Ojus is unincorporated Miami-Dade County, so all permits file with the county Building Department, not a city office. The inspection queue, fee schedule, and plan-review contacts are county-wide, which creates a different workflow than in incorporated cities like Aventura or Hallandale Beach. Contractors unfamiliar with this system often mis-file or underpay. We’ve worked the county desk for years and know the exact submission requirements.
A garage conversion ADU in Ojus typically runs $30,000-$80,000. The range reflects whether you’re converting a simple attached garage with existing utility access, or dealing with a detached structure requiring new electrical service, plumbing extension, and significant moisture remediation on the slab. Call (844) 665-0162 for a free estimate based on your specific garage and goals.
No. Original jalousie windows cannot remain in any permitted Ojus addition or ADU. Once structural or envelope work triggers current code compliance, all openings must meet HVHZ impact-resistance standards with Miami-Dade NOA-certified products. We replace them with code-compliant alternatives from Andersen, PGT, or other approved manufacturers, sized to maintain your home’s character where possible.
Almost certainly. Miami Limestone sits 1-3 feet below grade across Ojus, and the water table is equally shallow. Excavation for footings, utilities, or drainage almost always requires rock-cutting equipment and dewatering pumps that general earthwork contractors from outside the area don’t carry. We spec this equipment from the start - no mid-project surprises that stall your timeline.
Written by Raymond Estevez, Owner at Groundwork Construction Co. of Miami, serving Ojus and surrounding communities.