Junior ADU & Interior Conversion in Plantation, FL: Scope, Timeline, and Cost
A junior ADU and interior conversion in Plantation, FL transforms 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 10-16 weeks from permit approval to final inspection. Unlike a detached ADU, this project works within your current footprint, making it the fastest path to rental income or multigenerational living in Plantation’s established neighborhoods. Call (844) 665-0162 for a free on-site estimate and written timeline based on your specific floor plan.
How We Approach a Junior ADU & Interior Conversion in Plantation
We’ve refined this process across dozens of conversions in Broward County’s older housing stock. Here’s what actually happens, and when you’ll need to make decisions.
Stage 1: Feasibility and existing conditions review (1-2 weeks)
We walk the space with you, identify which walls are structural, locate existing plumbing stacks and electrical panels, and check whether your HVAC can handle the added load or needs a dedicated mini-split. For Plantation’s 1960s-1970s CBS homes, we’re specifically looking at electrical panel capacity, since many still carry original Federal Pacific or Zinsco panels that won’t pass modern inspection. You’ll decide at this stage whether the junior ADU needs a full kitchenette or can work with a compact kitchenette and convection cooktop to avoid gas line extension.
Stage 2: Design and permit documentation (3-5 weeks)
We produce floor plans, electrical and plumbing riser diagrams, and tie-down calculations if the conversion triggers wind-mitigation updates. Plantation’s building department requires Broward County-standard plans with energy compliance forms, and we’ll handle the submission and revision cycle. Your decisions here: fixture locations, door and window sizes (impact-rated or non-impact depending on exposure), and whether to add a separate meter for electrical submetering.
Stage 3: Structural and MEP rough-in (3-4 weeks)
This is where we open walls, run new supply and drain lines, extend or upgrade electrical circuits to 200-amp service if needed, and frame any new interior partitions. If we’re cutting into CBS walls for a new exterior door, we install lintels and tie-down straps to current Florida Building Code wind-load standards. You’ll sign off on rough plumbing and electrical placement before we close walls.
Stage 4: Insulation, drywall, and finishes (3-4 weeks)
We insulate to current energy code, hang and finish drywall, install flooring, cabinets, countertops, and fixtures. For kitchenettes in junior ADUs, we typically spec compact cabinetry runs 6-8 feet long with a single-bowl stainless sink and a 24-inch refrigerator drawer. You’ll make final selections on tile, paint, hardware, and appliance packages during this phase.
Stage 5: Final inspection and certificate of occupancy (1-2 weeks)
Broward County inspectors verify life safety systems, egress compliance, and energy code adherence. We address any punch-list items and hand over keys, manuals, and warranty documentation. The certificate of occupancy is what makes the unit legal for rental or resale disclosure.
The Spec Choices That Shape Your Junior ADU & Interior Conversion
Every decision below moves the budget and the long-term utility of the space. We lay out the honest trade-offs so you’re not guessing.
- Kitchenette scope: A wet bar with microwave and mini-fridge runs $3,500-$6,000. A full kitchenette with induction cooktop, range hood, dishwasher drawer, and undercounter fridge pushes $8,000-$14,000. For rental use, the full kitchenette commands higher rent; for family use, the wet bar often suffices.
- Bathroom configuration: A three-quarter bath (shower, toilet, sink) fits most junior ADU footprints at $6,000-$10,000. Adding a tub or expanding to a full bath with double vanity adds $4,000-$8,000. In Plantation’s compact 1,200-square-foot originals, the three-quarter bath is usually the practical maximum.
- Flooring: Luxury vinyl plank (LVP) at $3-$6 per square foot installed handles moisture and tenant wear better than engineered hardwood. Porcelain tile at $5-$9 per square foot lasts longest but adds demo weight and installation days. We don’t recommend carpet in rental junior ADUs.
- Countertop surface: Quartz from Silestone or Caesarstone runs $55-$85 per square foot installed and resists staining in rental scenarios. Solid surface at $35-$55 per square foot works for lower-budget conversions but scratches more easily. Laminate saves money upfront but rarely holds up to five years of tenant use.
- Plumbing fixtures: Kohler and Moen mid-grade lines offer the best repair-part availability in South Florida. Builder-grade off-brand fixtures cost 30% less but fail faster in hard-water conditions common to Plantation’s limestone-aquifer supply.
- Separate HVAC or shared system: A dedicated mini-split ($3,500-$5,500) gives the tenant control and isolates utility costs. Extending the central system ($2,000-$4,000) is cheaper but complicates billing and can overload aging compressors.
What Junior ADU & Interior Conversion Costs in Plantation, FL
| Project Component | Typical Range |
|---|---|
| Junior ADU & Interior Conversion (total) | $45,000 - $130,000 |
| Basic conversion (bedroom + bath, kitchenette, no structural move) | $45,000 - $75,000 |
| Mid-range conversion (reconfigured layout, upgraded finishes, separate HVAC) | $75,000 - $105,000 |
| Full-gut conversion (structural changes, impact windows, 200-amp service upgrade) | $105,000 - $130,000 |
Five factors move you through these ranges. First, existing condition: homes with original aluminum wiring, cast-iron drains, or unpermitted prior additions need remediation that adds $8,000-$20,000 before conversion work begins. Second, plumbing relocation distance: tying into an existing stack five feet away versus running 25 feet of new drain line across a slab changes the scope significantly. Third, electrical service capacity: upgrading from 100-amp to 200-amp service with new panel and mast runs $3,500-$6,500 in Plantation. Fourth, material grade: the difference between entry-level LVP and porcelain tile, or between stock cabinetry and semi-custom, can swing finishes by $10,000-$18,000. Fifth, permit scope: if the conversion triggers whole-house wind-mitigation or roof-tie-down upgrades, Broward County requires that work to be completed and inspected before the junior ADU can receive certificate of occupancy.
Our written estimates itemize labor, materials, permit fees, and contingency. They do not include temporary relocation costs, furniture storage, or landscaping repair from equipment access paths.
What Plantation’s Housing Stock Does to This Job
Plantation’s master-planned neighborhoods, particularly the early phases along Broward Boulevard and east of University Drive, were built with a construction logic that now works against simple conversions. Those 1960s-1970s CBS homes with low-pitched or flat roofs, original jalousie windows, and sliding glass doors were never designed for the wind-load and impact-resistance standards that today’s Florida Building Code enforces. When you pull a permit for a junior ADU and interior conversion, inspectors routinely flag the whole house for compliance gaps.
We’ve learned to budget for this. In Plantation, a junior ADU permit often expands to include impact-rated window replacements, roof-to-wall tie-down strap installation, and electrical panel upgrades. The insurance-mandated roof replacement wave hitting these neighborhoods right now means many homeowners are already addressing the roof assembly, which simplifies our tie-down work but requires sequencing coordination. The shallow limestone aquifer beneath Plantation, with seasonal water tables rising within two feet of grade during wet season, means any slab cutting for plumbing runs demands dewatering planning and Broward County surface water coordination. This isn’t a dealbreaker, but it’s a reality that contractors from outside the area often underestimate.
Homeowners in Plantation’s older subdivisions frequently pair a junior ADU conversion with Kitchen Design & Layout in Plantation for the main house, or with Small & Partial Kitchen Remodels in Plantation to refresh the primary kitchen while the secondary one is being built out. If you’re considering this as part of a full property reconfiguration, our Home Additions & ADU in Plantation page covers the broader scope, and our Home Additions & ADU service hub explains how our crew coordinates multi-phase work across Plantation and surrounding cities.
Serving Plantation, FL - Our Local Coverage Area
We’re based in the Plantation 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 Plantation
From permit approval to certificate of occupancy, expect 10-16 weeks. The permitting phase itself adds 3-5 weeks in Broward County, and homes with unpermitted prior work or outdated electrical panels can extend that timeline. Call (844) 665-0162 and we’ll assess your specific property for a realistic schedule.
Yes, absolutely. Broward County requires building, plumbing, electrical, and mechanical permits, and the finished unit must pass final inspection to receive a certificate of occupancy. Unpermitted conversions create title and insurance problems at resale and can trigger code-enforcement action. We handle the entire permit submission and inspection coordination as part of our standard process.
Sometimes, but rarely in Plantation’s 1960s-1970s stock. The original layouts typically place bedrooms far from plumbing stacks, and the compact room dimensions often require reconfiguring walls to fit a functional kitchenette and bath. During our feasibility walkthrough, we’ll identify whether your specific floor plan allows a “light-touch” conversion or needs structural adjustment.
The lowest-cost path is converting a bedroom that shares a wall with an existing bathroom, using a wet-bar kitchenette, keeping the existing HVAC zone, and selecting LVP flooring with stock cabinetry. This typically lands in the $45,000-$60,000 range. Moving plumbing across slab, upgrading electrical service, or adding impact windows pushes the number up quickly. We’ll show you exactly where each dollar goes in our written estimate.
We warranty our workmanship for one year from certificate of occupancy. Manufacturer warranties apply to fixtures, appliances, and materials (Silestone and Caesarstone carry their own residential warranties; Kohler and Moen fixture warranties vary by product line). We provide all warranty registrations and documentation at project closeout, and we respond to warranty calls directly rather than routing you through a third party.
Ready to Convert Space into Income in Plantation?
Call (844) 665-0162 to schedule a free on-site feasibility review for your junior ADU & interior conversion in Plantation. We’ll walk your floor plan, identify structural and MEP constraints, and deliver a written estimate with itemized pricing and a realistic timeline. No deposit required to get started.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Plantation and Broward County since our founding in Fort Lauderdale.