New Detached ADU in Andover - Same-Day Service, Done Right the First Time

New Detached ADU in Andover, FL: What It Costs and How Long It Takes

A new detached ADU in Andover is a standalone living unit built on your property, separate from your main house, with its own foundation, utilities, and full kitchen and bath - learn more about our Home Additions & ADU in Andover. Most builds here take 4-7 months from permit approval to final inspection, and in this market you’re typically looking at $90,000-$220,000 depending on size, utility routing, and whether you choose stick-built or prefab construction. Call (844) 665-0162 and we’ll walk your lot, check setbacks, and give you a written estimate with real numbers.

Call (844) 665-0162

How We Build a New Detached ADU in Andover

We’ve learned that homeowners stay sane during ADU construction when they know exactly what’s happening and when they need to make a decision. Here’s how we sequence a typical new detached ADU in Andover.

Stage 1: Site evaluation and design lock (2-3 weeks)

We measure your lot, confirm setback distances to property lines, and identify where water, sewer, and electrical tie into your main house. In Andover’s 33023 area, many lots were platted in the 1960s with narrow side yards, so the ADU’s footprint and placement often get decided by code before aesthetics. You’ll choose between stick-built, prefab (Abodu, Dvele, Mighty Buildings, Boxabl, Plant Prefab), or hybrid construction at this stage. We also pull a soil boring if the site shows signs of seasonal pooling, since the water table here sits just 2-5 feet down.

Stage 2: Permitting and HVHZ product approval (4-8 weeks)

Broward County’s High-Velocity Hurricane Zone status means every window, door, roofing product, and structural connector must carry a Miami-Dade or Florida Product Approval number. We submit engineered plans with HVHZ-rated specifications; inspectors will verify those approval numbers on site. This stage varies widely based on Broward County’s current backlog. We handle all plan revisions, but you’ll need to sign off on any changes that affect square footage or window placement.

Stage 3: Foundation and rough utilities (3-4 weeks)

Andover’s slab-on-grade tradition and high water table mean we almost always specify elevated footings with integrated drainage rather than slab-at-grade. We trench for water, sewer, and electrical from your main house, install a dedicated meter if required, and pour footings with hurricane straps embedded for the wall connection. You’ll decide on flooring height and entry threshold details here, since they affect the foundation pour.

Stage 4: Shell, MEP, and dry-in (6-10 weeks)

Walls go up, roof goes on, and we rough in plumbing, electrical, and HVAC. In Andover’s wet season, which runs June through October with 60-65 inches of annual rainfall, we prioritize getting dried-in before the heavy rains hit. Impact-rated windows and doors go in now, and you’ll make your final selections on interior finishes, fixtures, and appliances - see our Small Bathroom Remodels service in Andover for fixture inspiration. This is where choices between Silestone or Caesarstone countertops, Kohler or Moen plumbing fixtures, and standard or upgraded HVAC efficiency ratings get locked.

Stage 5: Interior finish and final inspection (4-6 weeks)

Insulation, drywall, flooring, cabinetry, countertops, tile, paint, and fixture installation. We schedule Broward County’s final inspection, which includes a HVHZ compliance check on all rated openings and structural connections. Once we pass, you get your certificate of occupancy. Total elapsed time from permit to move-in ready: typically 4-7 months, though complex utility routing or county delays can push toward the longer end.

The Build Options You’ll Actually Decide Between

Every new detached ADU in Andover forces a handful of real choices. These aren’t cosmetic upsells, they’re structural forks that change cost, timeline, and how the unit performs in a storm.

• Stick-built vs. prefab vs. hybrid: Traditional stick-built gives maximum customization and integrates cleanly with existing landscaping, but takes longer and costs more at the high end. Prefab units from Abodu, Dvele, Mighty Buildings, Boxabl, or Plant Prefab cut site time dramatically and often cost less per square foot, but require crane access and precise utility stub locations. Hybrid approaches, prefab shell with site-finished interior, split the difference. Prefab works well on Andover’s flatter lots; tight access between houses favors stick-built.
• Utility routing method: Trenching new lines from your main house is standard, but if your existing panel or sewer lateral is at capacity, you’ll need a service upgrade or septic alternative. That adds $8,000-$20,000 and 2-4 weeks. Some homeowners in Andover’s older CBS neighborhoods find their 1960s electrical service can’t handle the additional load without a full panel replacement.
• Impact-rated vs. standard windows and doors: In Andover’s HVHZ zone, impact-rated is essentially mandatory for permit approval, but there’s a range within that category. Standard impact vinyl from Simonton or Jeld-Wen meets code at lower cost; architectural-grade impact aluminum from PGT or CGI costs more but handles larger openings and slimmer sightlines. If your ADU design includes sliding glass doors or corner windows, the upgrade pays off in usable light and long-term seal integrity.
• Foundation type for wet-season drainage: Stem wall with raised slab handles Andover’s water table best and keeps finished floors above seasonal pooling. Slab-on-grade with perimeter drainage is cheaper but we’ve seen moisture wick through during heavy September rains. The stem wall adds roughly $4,000-$8,000 on a typical 500-square-foot unit.
• HVAC approach: Mini-split systems are quiet, efficient, and don’t require ductwork, which saves ceiling height in smaller ADUs. Central ducted systems integrate better if you’re planning to connect the ADU to the main house later, but they eat space and cost more to install. In Andover’s humidity, we specify dehumidification capacity regardless of which system you choose.

What New Detached ADU Costs in Andover, FL

For a new detached ADU in Andover, most homeowners land between $90,000 and $220,000. Here’s what pushes you toward the bottom or top of that range.

Our written estimates include architectural plans, HVHZ-rated materials, all rough and finish carpentry, plumbing and electrical to code, HVAC, insulation, drywall, paint, flooring, and fixtures. What typically sits outside the base estimate: permit fees (Broward County sets these), utility connection charges from the city or county, landscaping restoration, and any required tree removal or well/septic work if you’re off municipal sewer. We line-item these so you’re not surprised.

A 600-square-foot one-bedroom with mid-grade finishes and straightforward utility ties usually runs $110,000-$140,000 in this ZIP. Call (844) 665-0162 for an exact quote on your lot, estimates are free.

What Andover Homes Specifically Do to This Job

Serving Andover, FL in ZIP 33023 within Broward County, one of Florida’s High-Velocity Hurricane Zone jurisdictions, that status rewires nearly every decision in a new detached ADU build. The Florida Building Code requirements here are stricter than in most of the state, and inspectors verify Miami-Dade or Florida Product Approval numbers on windows, doors, roofing, and structural connectors before they’ll sign off.

The housing stock tells the rest of the story. Most homes in this area are 1950s-1970s concrete block structures on slab foundations, many with original terrazzo floors and aging flat or low-slope roofs. These houses predate modern hurricane strapping at the roof-to-wall connection, and their electrical and plumbing systems were installed before current standards. When we build a new detached ADU on these lots, we’re not starting fresh on open land, we’re threading new construction around legacy infrastructure that often needs simultaneous upgrading.

The wet season is equally real. Sixty to sixty-five inches of annual rainfall, concentrated in bursts from June through October, means any ground work happens against a ticking clock. We’ve had footings pour on Tuesday and three inches of rain Wednesday. That’s why we specify integrated drainage and often delay foundation work until the drier window if schedules allow. Out-of-county crews who don’t account for this routinely underestimate the protection needed during construction, and we’ve been called in to remediate water-damaged framing on jobs that skipped proper site drainage.

Finally, the product-approval trap catches contractors regularly. Materials approved for Orlando or Tampa don’t automatically qualify in Broward’s HVHZ. We source GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, or Boral roofing with explicit HVHZ ratings, and windows from Andersen, Pella, Marvin, Milgard, Jeld-Wen, Simonton, PGT, or CGI’s impact-rated lines. Inspectors in this jurisdiction know the difference, and they’ll red-tag a job that shows up with the wrong sticker.

Frequently Asked - New Detached ADU in Andover

Get a Free On-Site Estimate for Your New Detached ADU in Andover

We’ll walk your property, check setbacks and utility access, explain how Andover’s HVHZ requirements affect your specific build, and deliver a written estimate with real numbers, no deposit required. Call (844) 665-0162 or fill out our contact form to schedule. Most estimates happen within 48 hours, and we’re happy to review prefab and stick-built options side by side so you can make an informed choice.

Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Andover and South Florida homeowners since our founding.