What Does Junior ADU & Interior Conversion Cost and Involve in Boca Del Mar?
Junior ADU & Interior Conversion in Boca Del Mar typically runs $45,000-$130,000 and takes 8-14 weeks from permit to final inspection, depending on whether you’re reconfiguring an existing interior footprint or adding conditioned space to a garage or adjacent room. Most homeowners in 33433 reach us at (844) 665-0162 after realizing their 1970s-era layout can’t accommodate multigenerational living or rental income without a structural rethink. We handle the full scope, from Palm Beach County permitting through final finishes, as a single-source contractor.
How We Approach Junior ADU & Interior Conversion in Boca Del Mar
Every junior ADU & interior conversion follows a five-stage sequence. Here’s what actually happens, and what you’ll need to decide at each point.
Stage 1: Feasibility and existing conditions (Week 1)
We walk the space with you, measure every wall, and document the existing electrical panel, plumbing rough-ins, and structural bearing points. In Boca Del Mar’s 1970s-1980s CBS homes, we almost always find original aluminum single-pane windows, undersized electrical service, and flat or low-slope roof sections that need addressing before any interior reconfiguration. You’ll decide here whether the junior ADU needs a separate exterior entrance, which triggers additional Palm Beach County egress and impact-glazing requirements.
Stage 2: Design and permit submission (Weeks 2-4)
We produce permit-ready drawings showing the new layout, MEP routing, and any structural modifications. Because Boca Del Mar sits in unincorporated Palm Beach County, we file directly with the county’s Building Division, not Boca Raton’s department. This jurisdictional distinction matters. Contractors who file incorrectly face rejected plans and re-submission delays that routinely cost two to three weeks. We factor this into our timeline from day one.
Stage 3: Demolition and rough construction (Weeks 5-8)
We remove non-load-bearing partitions, open walls for new electrical and plumbing runs, and install any required headers or beams. If your conversion involves a garage or ground-level space, the shallow water table in Boca Del Mar, often 2-4 feet below grade, may require engineered moisture barriers or slab prep before we frame new walls. You’ll make your final selections on flooring, fixtures, and cabinetry during this window.
Stage 4: Systems and finishes (Weeks 9-12)
Licensed trades install electrical, plumbing, HVAC mini-splits or duct extensions, and insulation. We then hang drywall, install flooring, and set cabinets, countertops, and fixtures. For junior ADUs that include kitchenettes, we typically specify compact appliance packages and space-efficient layouts, often drawing from our cabinet partnerships with KraftMaid or Wellborn depending on your finish level.
Stage 5: Inspections and closeout (Weeks 13-14)
Palm Beach County conducts rough and final inspections for structural, electrical, plumbing, and HVAC. We coordinate every appointment and address any corrections immediately. Final walkthrough includes punch-list items, warranty documentation, and a clean handoff of permit cards and as-built drawings.
The Material and Configuration Choices You’ll Face
Junior ADU & interior conversion in Boca Del Mar isn’t one-size-fits-all. Here are the real decisions that shape your budget and daily experience:
- Entry and egress configuration: A separate exterior door with impact-rated glazing adds $3,500-$8,000 but qualifies the unit for rental income under Florida’s accessory dwelling statutes. Interior-only access keeps costs lower but limits future flexibility.
- Kitchenette scope: Wet bar with mini-fridge and microwave, or full two-burner cooktop with vented range hood and dishwasher drawer? The latter requires grease-duct routing and more complex plumbing, typically a $4,000-$7,000 swing.
- Bathroom layout: Converting existing plumbing nearby versus trenching new drains across the slab. In Boca Del Mar’s CBS construction with shallow footings, new slab penetrations require careful coordination to avoid moisture intrusion.
- Flooring: Luxury vinyl plank handles humidity well and installs fast. Tile adds thermal mass and durability but raises the floor height, potentially affecting door clearances and transitions. We stock both options across multiple price tiers.
- Countertops and fixtures: For compact kitchenettes and baths, we often specify Silestone or Caesarstone quartz surfaces for stain resistance in tight spaces, paired with Kohler or Moen fixtures depending on your finish preference and warranty priorities.
- HVAC strategy: Ductless mini-split systems dominate junior ADU work in South Florida. They’re efficient, permit-friendly, and avoid overloading aging central systems. We size these to the new load calculation, not guesswork.
What Junior ADU & Interior Conversion Costs in Boca Del Mar, FL
| Component Range | Typical Cost |
|---|---|
| Junior ADU & Interior Conversion (full scope) | $45,000-$130,000 |
| Basic interior reconfiguration, no structural changes | $45,000-$65,000 |
| Mid-range conversion with kitchenette and bath | $65,000-$95,000 |
| High-end conversion with separate entrance, impact glazing, full systems | $95,000-$130,000 |
Five variables push your number up or down:
Existing condition of the space. A finished room with intact drywall and functional electrical starts cheaper than a garage with raw block walls, no insulation, and a 100-amp panel that needs upgrading.
Plumbing and electrical relocation distance. Tapping into a wet wall on the opposite side of the house adds trenching, concrete cutting, and repiping costs that don’t exist when bathrooms back up to existing stacks.
Structural modifications. Removing load-bearing walls requires engineered beams and potential footing reinforcement. In Boca Del Mar’s 1970s slab construction, some beam loads transfer differently than modern post-tension designs.
Material and fixture grade. Stock cabinetry, standard LVP flooring, and basic fixtures keep you at the lower end. Custom built-ins, quartz surfaces, and branded hardware move you toward the top.
Permit scope and inspection complexity. Separate exterior entrances, new electrical service, or gas line extensions each trigger additional Palm Beach County review cycles and trade inspections.
A written estimate from Groundwork includes demolition, framing, rough and finish MEP, insulation, drywall, flooring, cabinetry, countertops, fixtures, paint, and permit coordination. It does not include furniture, window treatments, or landscaping repairs from equipment access.
Why Boca Del Mar’s Housing Stock Changes This Job
Boca Del Mar presents a specific set of conditions that contractors from Fort Lauderdale or Miami-Dade often underestimate. The community’s 1970s-1980s concrete block and stucco homes were built before Andrew rewrote Florida’s building code, which means junior ADU & interior conversion work frequently triggers mandatory upgrades that didn’t exist when these houses were framed.
Here’s what we encounter on nearly every job in 33433: original single-pane aluminum windows that must be replaced with impact-rated units or fitted with code-compliant shutters. Electrical panels from the era, often Federal Pacific or Zinsco brands, that won’t support additional circuits for a kitchenette and bath. Flat built-up roofs with chronic ponding that reveal rotted plywood decking the moment we open the ceiling for inspection. We carry extra sheathing to every Boca Del Mar job because of this.
The permitting reality is equally specific. Because Boca Del Mar is unincorporated Palm Beach County, all construction permits route through the county’s Building Division in West Palm Beach, not Boca Raton’s municipal department. We’ve seen projects stall for weeks when out-of-area contractors file with the wrong authority. Our team knows the county’s plan reviewers by name and submits complete packages the first time.
Many homeowners pair their junior ADU & interior conversion with updated living spaces elsewhere in the home. If you’re rethinking the main kitchen while we build out the ADU, our Kitchen Design & Layout in Boca Del Mar team can coordinate both scopes under one timeline. For smaller-scale kitchen updates, Small & Partial Kitchen Remodels in Boca Del Mar offers a targeted approach that keeps the project moving.
Your project may also be part of a full Home Additions & ADU in Boca Del Mar scope. Our Home Additions & ADU crew handles everything from interior conversions to detached units, always with the same single-point accountability.
Serving Boca Del Mar, FL - Our Local Coverage Area
We’re based in the Boca Del Mar 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 Boca Del Mar
Most projects finish in 8-14 weeks, with permit submission to Palm Beach County adding 2-4 weeks upfront. Delays typically come from incomplete permit packages filed with the wrong jurisdiction, which we avoid by routing directly to the county Building Division. Call (844) 665-0162 and we’ll map a realistic timeline to your specific space.
Yes. Any structural modification, new plumbing or electrical circuit, or separate living space requires Palm Beach County permits. Unpermitted work triggers failed resale inspections and potential code-compliance orders. We pull every required permit and schedule all inspections as part of our standard process.
Sometimes. If your target space backs up to an existing bathroom and kitchen stack, we can often work within the current footprint. But most 1970s Boca Del Mar layouts weren’t designed for independent living units, so some plumbing extension or wall modification is typical. We identify the minimal-intervention path during our feasibility walkthrough.
A simple bedroom-to-living-suite conversion with shared bath access starts near $45,000. Adding a kitchenette, separate entrance, and dedicated bath pushes most projects to $75,000-$95,000. High-end finishes, structural beams, and electrical service upgrades can reach $130,000. We provide itemized estimates so you see exactly what drives your number.
Groundwork warranties our workmanship for one year from substantial completion. Manufacturer warranties apply to specific products, your Kohler or Moen fixtures, Silestone or Caesarstone surfaces, and any appliances or HVAC equipment we install. We register all warranties in your name and provide documentation at closeout.
Start With a Free On-Site Estimate in Boca Del Mar
Call (844) 665-0162 to schedule a no-obligation walkthrough of your space. We’ll assess existing conditions, discuss your goals for the junior ADU & interior conversion, and deliver a written estimate with clear line items and a realistic timeline. Raymond Estevez and our team serve Boca Del Mar and surrounding Palm Beach County communities from our Fort Lauderdale base.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Boca Del Mar since our South Florida founding.