What Does a New Detached ADU Cost and Involve in Davie?
A new detached ADU in Davie typically runs $45,000-$130,000 for a complete build, with most projects finishing in 10-16 weeks from permit approval to final inspection. The unit stands as a separate structure on your property, complete with its own foundation, utilities, kitchen, and bath. Call (844) 665-0162 and we’ll walk your lot, check setback and utility access, and deliver a written estimate within 48 hours.
How We Build a New Detached ADU in Davie - Start to Finish
Every new detached ADU we build in Davie follows five distinct stages. Here’s what happens, what you’ll need to decide, and how long each phase takes.
Stage 1: Site evaluation and feasibility (Week 1)
We walk your property with a survey in hand, checking setbacks, utility locations, existing easements, and any equestrian overlay or flood zone designation that affects where we can place the structure. Davie’s western lots often sit on higher water tables, so we note drainage patterns and whether we’ll need engineered fill or a raised slab. You’ll decide on approximate unit size and placement during this visit. We handle the survey coordination if yours is outdated.
Stage 2: Design, permitting, and dual-agency coordination (Weeks 2-6)
We produce architectural plans and structural drawings for a new detached ADU that meets Broward County’s wind-load requirements and Davie’s specific zoning. If your lot falls within Davie’s equestrian overlay, we file with Davie Planning and Zoning for use compatibility before Broward County Building Division will touch the structural permit - a two-step sequence that catches out-of-town builders regularly. You’ll select your exterior finish, window grade, and whether you want impact-rated openings during this window. Permit timelines in Davie average 4-5 weeks for standard residential accessory structures, longer if floodplain elevation certificates are required.
Stage 3: Site prep and foundation (Weeks 7-9)
We clear the build area, relocate or cap any existing utilities, and address drainage. On Davie’s older CBS ranch lots, we frequently encounter shallow groundwater that demands a raised monolithic slab or stem-wall foundation rather than a simple slab-on-grade. You’ll sign off on foundation type and any soil correction before we pour. Inspection follows within 48 hours of the pour.
Stage 4: Framing, envelope, and MEP rough-in (Weeks 10-13)
The structure goes up, roof decking goes on, and we run electrical, plumbing, and HVAC rough-in. Davie’s 1960s-1980s housing stock often means tapping into aging main panels or septic systems that weren’t sized for an additional dwelling - we flag these early, but this is when you’ll see any necessary service upgrades. You’ll choose interior finishes, cabinetry, and fixtures during this phase so orders are placed before framing closes in.
Stage 5: Finish work, final inspection, and certificate of occupancy (Weeks 14-16)
Drywall, flooring, cabinetry, appliances, trim, and paint. We coordinate Broward County’s final structural, electrical, plumbing, and mechanical inspections, plus Davie’s zoning compliance sign-off if you’re in an overlay district. You’ll do a walkthrough with our project lead before we hand over keys and warranty documentation.
The Build Options You’ll Choose Between for Your Davie ADU
Every new detached ADU involves real trade-offs. These are the decisions that move your project toward budget-friendly or premium:
- Construction method: stick-built vs. prefab. Traditional stick-built framing on-site gives maximum customization and fits irregular lots - common on Davie’s older, non-rectangular equestrian parcels. Prefab units from partners like Mighty Buildings or Boxabl cut site time by 40-60% and arrive with finishes largely complete, but require crane access and precise foundation prep. Stick-built runs toward the higher end of our range; prefab can land lower if your site access is clean.
- Foundation type: monolithic slab vs. raised stem wall. Standard slab-on-grade works on well-draining eastern Davie lots. Western parcels near the Everglades transition zone almost always need raised foundations to address high water tables and FEMA floodplain requirements. Raised adds $8,000-$15,000 but prevents moisture intrusion that destroys standard slabs in 5-7 years here.
- Window and door grade: standard vs. impact-rated. Davie’s location in hurricane territory means impact-rated openings from brands like PGT or CGI add upfront cost but eliminate shutter installation and reduce insurance premiums. Standard windows with shutter provisions cost less initially; you’ll store and install shutters before every storm.
- Exterior finish: stucco vs. siding vs. board-and-batten. Stucco over CBS or framed backup matches Davie’s prevailing 1970s ranch aesthetic and holds up to salt air. Fiber-cement siding (James Hardie) resists moisture better on shaded, north-facing walls where stucco weeps. Board-and-batten in engineered wood gives a modern barn look that fits equestrian-zoned properties but needs more frequent resealing.
- Utility connection: tied to main house vs. separate meters. Tapping into your existing electrical panel and water main costs less upfront but can overload aging 100-amp services common in 1960s Davie homes. Separate meters from FPL and Broward County Water make the ADU truly independent and often required if you plan to rent long-term.
What a New Detached ADU Costs in Davie, FL
New detached ADU construction in Davie falls between $45,000 and $130,000. Here’s what pushes a project toward the low or high end of that range:
| Cost Driver | Low-End Scenario | High-End Scenario |
|---|---|---|
| Unit size | 400-500 sq ft studio | 800-1,200 sq ft 1-2 bedroom |
| Foundation conditions | Standard slab, dry site | Raised stem wall, groundwater, floodplain |
| Utility complexity | Tie into existing panel/main | New separate service, septic upgrade, well |
| Material grade | Standard finishes, non-impact windows | Impact-rated openings, quartz counters, custom cabinetry |
| Permit scope | Standard accessory structure | Equestrian overlay review, floodplain elevation, variance |
A written estimate from Groundwork includes architectural plans, structural engineering, all permits and agency fees, foundation, framing, MEP rough and finish, insulation, drywall, flooring, kitchen and bath fixtures, interior and exterior paint, and final cleanup. It does not include your appliance package, window treatments, landscaping restoration beyond basic grading, or any required septic or well system upgrades discovered after excavation. We flag likely extras during the site evaluation so you’re not surprised.
Call (844) 665-0162 for an exact quote - estimates are free and include a full site feasibility check.
What Davie’s Lots and Rules Specifically Mean for Your ADU Build
Davie isn’t like neighboring Fort Lauderdale or Pembroke Pines, and a builder who treats it that way will stall at permitting.
The town’s active equestrian overlay zoning means any contractor working here regularly navigates a dual-permitting system: Davie Planning and Zoning signs off on use compatibility before Broward County Building Division issues the structural permit. We’ve handled this sequence for barns, paddock structures, and residential accessory buildings - it’s standard for us, but it trips up crews who don’t know the sign-off order.
Davie’s housing stock also shapes what we build around. Most homes are 1960s-1980s CBS ranch structures on larger lots than you’ll find east of University Drive. Many predate the 1994 Florida Building Code and lack modern wind-mitigation features. When we build a new detached ADU on these properties, we’re often upgrading the main house’s electrical service simultaneously - the original 100-amp panels weren’t sized for an additional dwelling.
Then there’s the water. Davie sits on the western edge of Broward’s coastal ridge, transitioning toward Everglades drainage. The water table runs higher and more variable than in eastern Broward, which means slab foundations and underground drainage routinely hit groundwater. We plan for this from the first site visit, specifying raised foundations or engineered fill where a standard slab would fail within seasons.
Several Davie parcels also fall within FEMA Special Flood Hazard Areas. New construction and substantial improvements must meet elevated finished-floor requirements under federal and county floodplain ordinances. We pull elevation certificates early and design to them - not around them.
Homeowners on these larger lots often pair a new detached ADU with interior work on the main house. If you’re updating the kitchen while adding the unit, our Kitchen Design & Layout in Davie crew coordinates timing so you’re not living through two separate construction cycles. Many also refresh flooring throughout the property; our Backsplash, Tile & Flooring in Davie team handles material selection and install under the same project schedule.
Serving Davie, FL - Our Local Coverage Area
We’re based in the Davie 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 - New Detached ADU in Davie
Most new detached ADU projects in Davie take 10-16 weeks from permit approval to certificate of occupancy, with permitting itself adding 4-6 weeks depending on whether your lot is in a standard zone or Davie’s equestrian overlay. Call (844) 665-0162 and we’ll check your zoning and give you a realistic timeline for your specific property.
Yes - every new detached ADU requires a Broward County building permit, and if your property sits in Davie’s equestrian overlay district, you’ll also need Planning and Zoning sign-off for use compatibility before the county issues the structural permit. We handle both filings as part of our standard process.
Sometimes, but not often on Davie’s older lots - many 1960s-1980s homes here still run 100-amp electrical service and original septic systems that can’t handle an additional dwelling’s load, so we evaluate capacity during the site visit and include any necessary upgrades in the estimate. You’ll know before we break ground whether your existing service is sufficient.
The most cost-effective new detached ADU is typically a compact prefab unit (500-600 sq ft) on a standard slab with utility tie-ins to your existing service, keeping you toward the $45,000-$65,000 range - though on western Davie lots with high water tables, even budget builds may need raised foundations that push costs up. Call (844) 665-0162 for a site-specific quote; estimates are free.
We warranty our workmanship on every new detached ADU we build, and the materials we install carry their own manufacturer warranties - from the roofing shingles to the windows to the kitchen fixtures, each backed by the brand that made it. You’ll receive warranty documentation for every product at project closeout.
Start Your New Detached ADU in Davie
Call (844) 665-0162 to schedule a free on-site estimate for your new detached ADU in Davie. We’ll walk your lot, check zoning and utility access, and deliver a written quote within 48 hours. Whether you’re expanding for family, rental income, or a home office, we build to spec - not to convenience. Groundwork serves Davie and surrounding areas including Cooper City, Broadview Park, and Pine Island Ridge. For the full scope of our addition and expansion work, see our Home Additions & ADU in Davie page, or explore our Home Additions & ADU service hub.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Davie and South Florida homeowners since our founding.