Garage Conversion ADU in Andover: What It Costs and How Long It Takes
A garage conversion ADU in Andover transforms your existing attached or detached garage into a permitted living space, typically adding 300-600 square feet of conditioned floor area. Most projects we run in ZIP 33023 take 10-16 weeks from permit approval to final inspection, and the investment range runs $30,000-$80,000 depending on whether you’re keeping the slab and roof or rebuilding major systems. Call (844) 665-0162 and we’ll walk your specific garage with you, same week.
How We Approach a Garage Conversion ADU in Andover
Every garage conversion ADU follows a sequence, but the order matters more than people expect. In Andover, where many garages sit on 1950s-1970s slabs with original block walls, we can’t start finish selections until we know what the existing structure will allow.
Stage 1: Existing conditions assessment and as-built documentation (3-5 days)
We measure slab thickness, roof framing, and wall height; test the electrical panel for available amperage; and locate the sewer lateral to see if you’re adding a kitchen or bathroom. Homeowner decision point: do you want a full kitchen, a kitchenette, or no cooking capability? That single choice changes your permit path and utility scope dramatically.
Stage 2: Design and permit package submission (4-8 weeks)
Our draftspeople produce plans showing the conversion meets Broward County’s HVHZ requirements for impact-rated openings, fire separation between dwelling and ADU, and minimum ceiling height. Homeowner decision point: window and door placement, which triggers your impact-product selections. We spec from Andersen, Pella, or CGI lines that carry Miami-Dade approval numbers inspectors recognize.
Stage 3: Structural and MEP rough-in (3-5 weeks)
This is where Andover’s older housing stock shows its age. We often find the garage roof isn’t tied to walls with hurricane straps, or the slab lacks a vapor barrier. We retrofit strapping, run new electrical circuits from a panel upgrade if needed, and stub plumbing through the slab or along walls. Homeowner decision point: mini-split location and capacity, which determines how we route refrigerant lines and condensate drainage.
Stage 4: Insulation, drywall, and finishes (4-6 weeks)
We insulate to current Florida Energy Code, hang and finish drywall, install flooring over the slab, and trim out electrical and plumbing fixtures. Homeowner decision point: flooring type over that original terrazzo or bare concrete, cabinet grade if there’s a kitchen, and whether you’re running tile into a wet area. Many homeowners pair this stage with Cabinets & Countertops in Andover to keep material coordination under one roof.
Stage 5: Final inspections and certificate of occupancy (1-2 weeks)
Broward County inspectors verify egress window operation, GFCI/AFCI protection, fire separation, and impact-product labels. We don’t schedule final until we’ve walked it ourselves. Homeowner decision point: punch list items, which we resolve before you sign off.
The Choices That Shape Your Garage Conversion ADU
Every decision below moves your number and your daily experience. We don’t default you to one tier; you choose the brand, we handle the build.
- Kitchen configuration: Full kitchen with range and dishwasher adds $8,000-$18,000 over a wet bar or kitchenette. If you’re renting the ADU, the full kitchen commands higher rent. If it’s for family, the kitchenette keeps the footprint open. We source cabinetry from KraftMaid or Wellborn lines, with Silestone or Caesarstone surfaces if you’re running counters.
- Bathroom scope: Adding a full bath means cutting the slab for drainage or pumping up to the main sewer line, which runs $4,500-$12,000 depending on depth and distance. A half-bath avoids the slab work but limits rental appeal. Kohler and Moen fixtures are what we typically spec for durability in rental units.
- HVAC approach: Ductless mini-split is standard for garage conversion ADU projects, $2,500-$6,500 installed. Extending your main house ductwork rarely works; garages in this era weren’t designed for the static pressure, and code requires separate control.
- Floor finish over the slab: Luxury vinyl plank handles moisture fluctuation well on old slabs and runs $4-$9 per square foot installed. Tile, often selected for Backsplash, Tile & Flooring in Andover coordination, costs more but handles the humidity. Carpet we don’t recommend; the slab wicks moisture.
- Roof and exterior integration: Keeping the existing roof saves $5,000-$15,000 but may mean living with a low slope and limited insulation. Re-framing for a gable or raising the ceiling to 8 feet minimum transforms the feel but triggers full structural review.
What Garage Conversion ADU Costs in Andover, FL
Garage conversion ADU projects in Andover fall between $30,000 and $80,000. That’s a wide span because the job isn’t one thing. Here’s what pushes you toward each end.
| Cost Driver | Low-End Scenario | High-End Scenario |
|---|---|---|
| Size and existing condition | 400 sq ft, sound block walls, no plumbing | 600+ sq ft, deteriorated roof, slab replacement needed |
| Utility relocation | Electrical only, panel has capacity | New sewer lateral, water heater, panel upgrade |
| Material grade | Standard fixtures, vinyl plank, stock cabinets | Impact windows, stone counters, custom cabinetry |
| Permit scope | Accessory use, no rental intent declared | Full rental ADU with separate metering |
| Structural work | Existing roof and walls remain | Wall raising, re-roofing, hurricane retrofit |
Our written estimates itemize demolition, rough and finish carpentry, electrical, plumbing, HVAC, insulation, drywall, flooring, fixtures, and permit fees. What typically isn’t included: separate electric meter installation (FPL coordination), tree removal for access, or soil remediation if your slab has settled. We flag these during assessment so you’re not surprised.
This project often sits within a broader expansion plan. If you’re considering a Home Additions & ADU in Andover that goes beyond the garage, we’ll sequence the work so you’re not paying for mobilization twice.
Why Andover’s Housing Stock Changes the Job
Andover sits within ZIP 33023 in Broward County, a High-Velocity Hurricane Zone where inspectors check Miami-Dade or Florida Product Approval numbers on every impact-rated window and door. The garage you’re converting was likely built in the 1960s or 1970s as a storage appendage, not living space. Block walls are common and durable, but the roof-to-wall connection probably lacks hurricane straps, and the electrical may be on a subpanel fed by aluminum wiring or insufficient amperage.
We see two recurring conditions. First, the original garage slab was poured without a vapor barrier, so moisture migration through the concrete is standard. We address this with proper sealers and flooring selection, not by pretending it doesn’t exist. Second, the flat or low-slope roof on many Andover garages has reached the end of its service life. Re-roofing during conversion is almost always cheaper than coming back in five years, and it lets us insulate properly.
The wet season runs June through October, and with the water table at 2-5 feet, any drainage improvement around the garage perimeter matters. We plan exterior grading as part of the job, not an afterthought. Out-of-county crews sometimes miss these layers; we’ve corrected enough of their jobs to know the cost of underestimating South Broward’s conditions.
Our Andover projects also coordinate with the broader scope our Home Additions & ADU crew handles, so if you’re matching finishes to a main-house kitchen remodel or planning future exterior work, the sequencing stays coherent.
Serving Andover, FL - Our Local Coverage Area
We’re based in the Andover 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 - Garage Conversion ADU in Andover
Most garage conversion ADU projects in Andover take 10-16 weeks after permit approval, with permits themselves running 4-8 weeks in Broward County. The timeline stretches if your garage needs structural retrofit or panel upgrades. Call (844) 665-0162 and we’ll give you a realistic schedule based on your specific garage condition.
Yes, every garage conversion ADU in Broward County requires permits for structural, electrical, plumbing, and mechanical work, plus a certificate of occupancy. Because Andover is in an HVHZ, inspectors also verify impact-product approvals and hurricane strapping. We prepare and submit the full package; you don’t navigate the county portal alone.
You can, but only if you’re building unconditioned storage or a basic workshop. A legal garage conversion ADU with living, sleeping, or cooking space requires dedicated electrical circuits, proper egress lighting, and either plumbing or a documented alternative. Many Andover garages lack panel capacity for these additions, so we assess this on day one.
Garage conversion ADU work typically runs $30,000-$80,000, while new detached ADU construction in this market starts around $90,000 and runs past $220,000. The existing slab and roof shell are what save you money, assuming they’re sound. If your garage needs major structural work, the gap narrows; we’ll tell you honestly when that threshold hits.
We warranty our workmanship for one year, and the materials we install carry their own manufacturer warranties, from Andersen window glass to Kohler valve cartridges. Because we’re a single-source contractor, you don’t chase multiple vendors if something fails. For specifics on your selections, call (844) 665-0162 during your estimate walkthrough.
Get an On-Site Estimate for Your Garage Conversion ADU in Andover
We’ll walk your garage, check slab condition, panel capacity, and roof structure, then deliver a written estimate with itemized pricing and a realistic timeline. No pressure, no generic quote. Call (844) 665-0162 to schedule your free estimate in Andover this week.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Andover and South Florida homeowners since our founding.