What Does Junior ADU & Interior Conversion Cost and Involve in Hollywood?
A junior ADU & interior conversion in Hollywood transforms an existing bedroom, attached garage section, or underutilized interior space into a self-contained living unit with its own kitchenette, full bathroom, and separate entrance, typically running $45,000-$130,000 and taking 8-14 weeks from permit to final inspection. Unlike a detached ADU build, this job works within your current footprint, which keeps the budget lower but demands precise structural, plumbing, and electrical planning to meet Broward County’s HVHZ building standards. Call (844) 665-0162 for a free on-site estimate and timeline specific to your Hollywood home’s layout.
How We Approach Junior ADU & Interior Conversion in Hollywood
We’ve learned that homeowners in Hollywood’s 55+ communities and seasonal-resident neighborhoods want one thing above all: a project that finishes on schedule so they can lock up and head north without worry. Our process for junior ADU & interior conversion is built around that reality. Here’s how it unfolds stage by stage.
Stage 1: Feasibility and Layout Design (Week 1)
We visit your property, measure the existing space, and identify the most logical location for a separate entrance, typically through a side yard or by reconfiguring an attached garage bay. You’ll decide at this stage whether the unit needs a full kitchen or a compact kitchenette, whether the bathroom will be a tub-shower combo or a walk-in shower for accessibility, and where the HVAC will tap in. We photograph existing electrical panels, plumbing stacks, and structural walls. By day 5, you have a floor plan and a preliminary budget bracket.
Stage 2: Structural and MEP Assessment (Weeks 2-3)
Our structural engineer evaluates load-bearing walls, ceiling joists, and the foundation’s capacity to handle added wet areas. Simultaneously, our MEP team maps how to extend or reroute plumbing, electrical, and ductwork. In Hollywood’s pre-1992 concrete block homes, we often find original electrical panels that won’t handle the additional load, or cast-iron drain lines that need sectional replacement. You’ll approve any structural modifications and the electrical service upgrade path at this point. This stage typically takes 10-14 days.
Stage 3: Permitting with Broward County (Weeks 3-6)
We submit to Broward’s Building Code Services with HVHZ-compliant structural details, Miami-Dade NOA documentation for all impact-rated windows and exterior doors, and energy calculations. For Home Additions & ADU in Hollywood, this permit phase is non-negotiable and detailed. If your home sits east of the Intracoastal, we may also need DEP Coastal Construction Control Line clearance. We handle all submissions and revision responses. You don’t attend the permit desk; we do. Typical turnaround: 2-4 weeks depending on backlog.
Stage 4: Construction and Rough-Ins (Weeks 7-11)
Demolition is surgical, not wholesale. We preserve what we can, especially in CBS homes where the block shell is an asset. Framing for interior partitions, plumbing rough-in, electrical service upgrade, and HVAC ducting happen in sequence, each with its own inspection. In Hollywood’s older homes near neighborhoods like Hollywood Hills or the historic eastern districts, we often encounter asbestos-containing floor tile or lead paint that requires certified abatement, adding 3-5 days. You’ll make your final material selections during this window: flooring, cabinetry, countertops, fixtures, and tile.
Stage 5: Finishes, Final Inspection, and Certificate of Occupancy (Weeks 12-14)
Drywall, paint, flooring, cabinetry installation, fixture hookups, and appliance connections proceed in rapid sequence. We schedule the final building, plumbing, and electrical inspections together to avoid the delays that plague projects with poor inspection coordination. Once Broward issues the Certificate of Occupancy, your junior ADU is legally rentable or ready for family use. For seasonal residents, we coordinate a final walkthrough via video call if you’re already back up north.
The Options You’ll Choose Between for Your Junior ADU & Interior Conversion
Every decision below affects how the space functions, who it serves, and what it costs. We present the trade-offs honestly so you’re not surprised mid-project.
- Kitchenette vs. full kitchen: A kitchenette with a two-burner induction cooktop, under-counter refrigerator, and single-bowl sink runs $3,500-$7,000 and fits most junior ADU footprints. A full kitchen with standard range, dishwasher, and full-size refrigerator adds $8,000-$15,000 but makes the unit genuinely independent. For Hollywood’s snowbird homeowners who rent seasonally, the full kitchen commands higher rental rates.
- Shower configuration and accessibility: A standard 32-by-60-inch fiberglass shower surround is cost-effective at $1,200-$2,500 installed. A curbless walk-in with grab-bar blocking and a handheld fixture adds $3,500-$6,000 but future-proofs the unit for aging-in-place, a priority in Hollywood’s retirement-heavy demographics.
- Flooring: Luxury vinyl plank (LVP) at $4-$8 per square foot handles humidity well and installs fast. Porcelain tile at $7-$14 per square foot costs more but resists the sand and moisture tracked in from Hollywood’s barrier island beaches. We don’t recommend carpet in any junior ADU; it won’t survive rental turnover.
- HVAC approach: Extending your existing central system is cheapest if the unit is small and your current unit has capacity, typically $2,000-$4,000. A dedicated mini-split at $3,500-$7,500 gives the tenant independent climate control and avoids wear on your main system during vacant months.
- Separate entrance location: Converting an existing window to a code-compliant egress door in a CBS wall runs $3,000-$6,000 including lintel reinforcement and impact-rated door assembly. A new opening cut through block requires more structural work, $5,000-$9,000, but sometimes it’s the only logical path to privacy.
What Junior ADU & Interior Conversion Costs in Hollywood, FL
Junior ADU & interior conversion in Hollywood typically falls between $45,000 and $130,000. The table below breaks out where most budgets land based on scope.
| Scope Level | Typical Range | What It Includes |
|---|---|---|
| Compact conversion (bedroom + bath, kitchenette, no plumbing relocation) | $45,000-$70,000 | Basic finishes, existing HVAC extension, minimal structural work |
| Mid-range conversion (garage bay or large room, full kitchen, bathroom with shower) | $70,000-$95,000 | Quality LVP or tile, solid surface countertops, mini-split HVAC, new entrance |
| Full conversion with structural modifications and premium finishes | $95,000-$130,000 | Load-bearing wall adjustments, electrical service upgrade, impact-rated windows/doors, quartz or granite surfaces |
Five factors push your number up or down. First, existing condition: a 1960s Hollywood home with original aluminum wiring, cast-iron plumbing, and a 100-amp panel needs more remediation than a 1995 build. Second, plumbing and electrical relocation: moving a toilet drain or main electrical feed across the house adds $4,000-$12,000. Third, structural modifications: removing or altering load-bearing walls in CBS construction requires engineered beams and specialized fastening, $3,000-$8,000. Fourth, material grade: the jump from builder-grade to mid-grade cabinetry and fixtures is roughly 40% in material cost alone. Fifth, permit complexity: coastal properties or HOA-governed communities add review layers that extend timeline and professional fees.
A written estimate from us includes all labor, materials, permits, and inspections. It does not include temporary relocation if you choose to move out during construction, utility connection fees charged by the city, or optional items like smart-home prewiring or security systems.
What Hollywood Homes Specifically Do to This Job
Hollywood’s housing stock splits the junior ADU & interior conversion market into two distinct challenges. East of I-95, in ZIPs like 33020 and 33023, we work constantly on 1950s-1970s concrete block and stucco homes built for the Northeast snowbird trade. These structures are durable but electrically and mechanically exhausted. Original jalousie windows, flat built-up roofs, and Federal Pacific or Zinsco electrical panels are still common. A junior ADU & interior conversion here almost always requires a full electrical service upgrade to 200 amps, new impact-rated window assemblies with Miami-Dade NOA documentation, and often structural hurricane tie-down retrofits that Palm Beach contractors never think about because their market sits outside the High Velocity Hurricane Zone.
West of the Florida Turnpike, in 33024 and 33025, the homes are younger, typically 1980s-2000s tract construction with concrete tile roofs and modern framing. The work is cleaner but the HOAs are more active. We’ve had projects in communities like Emerald Hills or Hollywood Hills delayed two weeks because the architectural review committee required paint-color matching to an existing palette that wasn’t in the original CC&Rs. For Hollywood homeowners on the barrier island, salt-air corrosion of any exposed metal framing or fasteners is a real concern; we spec stainless or hot-dip galvanized hardware even for interior work where coastal humidity penetrates.
The most expensive surprise we see? Contractors unfamiliar with Broward’s HVHZ requirements submitting standard Florida Product Approval documentation for windows or doors, getting rejected at permit, and forcing a material change that blows both budget and schedule. Our home additions & ADU crew knows which manufacturers maintain current NOAs with HVHZ listings, and we verify before anything gets ordered.
Serving Hollywood, FL - Our Local Coverage Area
We’re based in the Hollywood 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 Hollywood
Most projects finish in 8-14 weeks, with permitting consuming 2-4 of those weeks depending on Broward County’s current review backlog. Pre-1992 homes with electrical or plumbing remediation tend toward the longer end. Call (844) 665-0162 and we’ll give you a realistic timeline based on your home’s year built and the scope you’re considering.
Yes, absolutely. Broward County requires building, plumbing, electrical, and mechanical permits, plus a final Certificate of Occupancy. Any work done without permits cannot be legally rented and will surface as a disclosure issue on future sale. We handle all permit submission and inspection scheduling as part of our standard process.
Sometimes, if your target space already sits near an existing bathroom and kitchen stack. More often, at least one wet wall needs relocation or a new plumbing chase needs framing. During our feasibility visit, we’ll map the most efficient routing and tell you honestly whether a no-relocation layout is possible or if the compromise in functionality isn’t worth the savings.
Typically yes. A junior ADU & interior conversion avoids foundation work, new roofing, and exterior framing, which are major cost drivers in detached construction. Our detached ADU builds start around $90,000 and climb steeply; interior conversions begin closer to $45,000. The trade-off is less privacy and no separate yard space for the occupant.
We warranty our workmanship for one year from Certificate of Occupancy. Manufacturer warranties apply separately to appliances, fixtures, windows, and HVAC equipment, typically ranging from 5 years to lifetime depending on the brand. We register all manufacturer warranties in your name and provide documentation at project closeout. For warranty service, you call us directly; we don’t route you through a third party.
Get Your Free On-Site Estimate for Junior ADU & Interior Conversion in Hollywood
We’ll walk your property, measure the space, check your electrical panel and plumbing access, and deliver a written estimate with a realistic timeline. No pressure, no deposit required to receive it. Many homeowners pair this work with Kitchen Design & Layout in Hollywood or Small & Partial Kitchen Remodels in Hollywood to refresh the main house while the junior ADU takes shape. Call (844) 665-0162 or fill out our contact form to schedule. Raymond Estevez and our team at Groundwork Construction Co. will handle every phase, from first measurement to final inspection, with one point of accountability throughout.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Hollywood since our South Florida founding.