Junior ADU & Interior Conversion in Miramar: What It Costs and How Long It Takes
A junior ADU & interior conversion in Miramar converts an existing bedroom, den, or attached living space into a self-contained unit with its own kitchenette, bathroom, and separate entrance, typically running $45,000-$130,000 and taking 8-14 weeks from permit approval to final inspection. Unlike a detached ADU, this job works within your current footprint, which keeps the project manageable but demands precise coordination of plumbing, electrical, and structural modifications. Call (844) 665-0162 and we’ll walk your Miramar property to see what’s feasible and what Broward County will require.
How We Approach a Junior ADU & Interior Conversion in Miramar
We’ve learned that homeowners in Miramar’s 33023 corridor want to know exactly what happens when, especially when they’re living in the house during construction. Here’s how we stage these projects.
Stage 1: Feasibility and as-built documentation (1-2 weeks)
We measure every wall, locate existing plumbing stacks, and verify electrical panel capacity. In Miramar’s older CBS homes, we also check whether the original construction included hurricane strapping, since any permitted interior conversion now triggers Broward County’s structural review. You’ll decide at this stage whether to proceed with a full permit package or explore an unpermitted scope, which we don’t recommend given the liability and resale complications.
Stage 2: Design and permit submission (3-6 weeks)
Our architect drafts floor plans showing the new kitchenette layout, bathroom location, and egress window or door requirements. We submit to Broward County’s building department, which typically reviews residential additions in 2-4 weeks, though resubmittals are common on first-generation ADU plans. You’ll choose your material package during this window, kitchenette included, so we can spec electrical and plumbing rough-ins precisely.
Stage 3: Structural prep and rough trades (2-3 weeks)
We frame any new interior walls, open floors for plumbing if the bathroom or kitchenette needs to relocate, and run dedicated electrical circuits. Galvanized plumbing in 1950s-1970s Miramar homes often requires full replacement at this point, not just extension. You’ll make a site visit after rough-in to confirm fixture locations before we close walls.
Stage 4: Finish installation (2-3 weeks)
Cabinets, countertops, flooring, tile, fixtures, and paint go in. We coordinate inspections for electrical, plumbing, and framing as each trade closes out. If your home is part of a full Home Additions & ADU in Miramar project, we sequence this work to minimize disruption to the main house.
Stage 5: Final inspection and punch list (3-5 days)
Broward County conducts a final walkthrough verifying egress, smoke detection, and GFCI protection. We address any corrections immediately and hand over keys, manuals, and warranty documentation.
The Spec Choices That Shape Your Junior ADU & Interior Conversion
Every junior ADU & interior conversion in Miramar involves decisions that affect cost, durability, and rental appeal. These are the trade-offs we discuss with homeowners upfront.
- Kitchenette footprint: wet wall vs. remote plumbing. Tapping into an existing wet wall (where plumbing already stacks) saves $3,000-$7,000 but constrains your layout. Running new lines to a remote wall opens design freedom and typically requires a floor cut in slab-on-grade homes, which is standard in Miramar’s 33023 construction.
- Cabinetry grade: stock, semi-custom, or custom. Stock boxes from KraftMaid or Wellborn run $2,500-$4,500 for a compact kitchenette and deliver solid construction with shorter lead times. Semi-custom adds drawer organizers, soft-close hardware, and finish flexibility for $4,500-$7,500. Custom millwork exceeds $8,000 and makes sense only when the ADU serves as a primary guest suite or short-term rental.
- Countertop material: laminate, quartz, or solid surface. Laminate at $800-$1,500 is functional but shows wear under tenant use. Cambria and other engineered quartz brands hit $2,000-$3,500 for a small kitchenette, resist staining, and carry 10-year residential warranties that transfer to buyers. We spec quartz for most Miramar conversions intended as long-term rentals.
- Bathroom configuration: tub-shower combo, walk-in shower, or wet bath. A 32-inch tub-shower fits tight spaces and appeals to families. A 36-inch walk-in shower with a curb or zero-threshold entry costs $1,500-$3,000 more but ages better for accessibility. Wet baths (tankless drain, no curb) maximize square footage in units under 400 square feet.
- Separate entrance: retrofit existing door or cut new opening. Converting a window to an egress door runs $4,000-$8,000 in CBS construction and requires a lintel and impact-rated assembly. Using an existing rear or side door cuts that cost but may compromise privacy or parking flow.
- HVAC: extend central system or install mini-split. Extending ductwork from your main unit costs $2,500-$5,000 if capacity allows. A dedicated mini-split at $3,500-$6,500 gives the tenant independent climate control and avoids overloading an aging central system, which matters in Miramar’s extended cooling season.
What Junior ADU & Interior Conversion Costs in Miramar, FL
Junior ADU & interior conversion in Miramar typically falls between $45,000 and $130,000. The table below shows where most projects land based on scope.
| Scope Level | Typical Range | What It Includes |
|---|---|---|
| Basic conversion (existing bath, wet-wall kitchenette, no structural) | $45,000-$65,000 | Stock cabinets, laminate or entry quartz, basic fixtures, mini-split, paint |
| Mid-range conversion (relocated bath or kitchen, some floor work) | $65,000-$95,000 | Semi-custom cabinets, engineered quartz, walk-in shower, electrical panel upgrade |
| Full conversion (remote plumbing, new egress, structural review) | $95,000-$130,000 | Custom or semi-custom throughout, full plumbing replacement, impact door, integrated finishes |
Five variables push your number up or down. Existing plumbing condition: galvanized lines in 1960s Miramar homes add $4,000-$8,000 for replacement. Kitchenette and bath location: keeping both on the wet wall saves significantly; relocating either adds floor work and materials. Electrical panel capacity: a 100-amp service common to older Miramar homes often requires upgrading to 200 amps, a $3,500-$6,500 line item. Material grade: moving from stock to semi-custom cabinets and quartz adds $5,000-$10,000 but improves rental income potential. Permit-triggered structural remediation: when Broward County requires hurricane strapping or roof-deck fastening updates, budget $5,000-$15,000 depending on roof complexity.
A written estimate from us includes demolition, rough and finish carpentry, plumbing and electrical rough-in and trim, fixtures, cabinets, countertops, flooring, paint, and permit fees. It does not include appliance packages, window treatments, or landscaping repair from equipment access. Call (844) 665-0162 for an exact quote, estimates are free.
What Miramar Homes Specifically Do to This Job
The 33023 ZIP code shapes every junior ADU & interior conversion we bid in Miramar. These are mid-century CBS homes built before Hurricane Andrew rewrote Florida’s building code, and the county doesn’t grandfather them through. When we pull a permit for interior conversion, the inspector routinely flags roof-to-wall connections, roof deck nailing patterns, and opening protection. We’ve seen projects where a straightforward bedroom-to-ADU conversion expanded to include partial re-roofing and strap installation because the original construction predated those requirements.
Water management matters too. Miramar’s flat coastal plain puts the water table within inches of grade during summer storms. Any floor cut for plumbing requires compacted fill and proper drainage detailing, or you’ll get moisture wicking through slab edges. We engineer this into every ground-level conversion.
The other surprise we plan for: unpermitted additions from the 1980s. Screen enclosures, carport conversions, and rear rooms in the 33023 corridor were often built under looser standards or without permits. Once we file for your junior ADU & interior conversion, Broward County’s permit history review surfaces these structures, and they must be brought to current wind-load standards before your new work proceeds. We’ve had projects where this discovery doubled the initial scope. We price contingency into our estimates and flag the risk during feasibility so you’re not blindsided.
Homeowners often pair this work with Kitchen Design & Layout in Miramar for the main house, or with Small & Partial Kitchen Remodels in Miramar to refresh the primary kitchen while the ADU kitchenette goes in. Our Home Additions & ADU crew coordinates both scopes under one timeline.
Serving Miramar, FL - Our Local Coverage Area
We’re based in the Miramar area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked - Junior ADU & Interior Conversion in Miramar
From permit approval to final inspection, expect 8-14 weeks. Broward County’s review adds 3-6 weeks before construction starts, and structural remediation discovered during permitting can extend that timeline. Call (844) 665-0162 and we’ll review your property’s permit history to flag potential delays early.
Yes, absolutely. Any conversion adding a kitchenette, separate bathroom, or separate entrance triggers Florida Building Code requirements and Broward County permitting. Unpermitted work creates title insurance problems, resale complications, and safety liability. We handle the full permit package as part of our standard process.
Sometimes, if an existing bedroom sits adjacent to a bathroom and near a wet wall with kitchen plumbing. More often, Miramar’s 1950s-1970s layouts require at least partial relocation to achieve functional kitchenette and bath configurations. We identify the minimal-intervention option during feasibility and price both approaches.
The lowest-cost path uses existing wet walls, keeps the current bathroom location, specs stock cabinets and laminate countertops, and avoids electrical panel upgrades or structural remediation. That typically starts around $45,000. Cutting below that threshold usually means skipping permits or using unlicensed labor, which we don’t do. Call (844) 665-0162 to see if your layout supports the streamlined approach.
We warranty our workmanship for one year from final inspection. Manufacturer warranties apply to cabinets, countertops, fixtures, and appliances per their terms, Cambria and KraftMaid both carry residential coverage that transfers to subsequent owners. We provide all warranty documentation at project closeout and assist with any manufacturer claims.
Get a Free On-Site Estimate for Your Miramar Property
We’ll walk your space, check permit history, and give you a written estimate for junior ADU & interior conversion in Miramar with no obligation. Call (844) 665-0162 or request a visit online. Raymond Estevez or a senior project lead will handle your consultation directly.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Miramar and South Florida.