ADU Site Prep & Utilities in Andover, FL - What It Costs and How Long It Takes
Home Additions & ADU in Andover site prep and utilities typically runs $45,000-$130,000 as part of a full home addition, with utility rough-in and foundation work adding 3-6 weeks before the structure goes up. Most Andover jobs we handle in ZIP 33023 need trenching for sewer and water tie-ins, electrical service upgrades, and drainage systems that account for Broward County’s high water table. Call (844) 665-0162 and we’ll walk your property, flag the utility paths, and give you a written estimate with a real timeline.
How We Handle ADU Site Prep & Utilities - Start to Finish
We’ve broken this work into five clear stages so you know what happens when, and what you’re deciding at each point. No surprises, no “we’ll figure it out later.”
Stage 1: Utility Locate and Site Survey (Days 1-3)
Before anything gets dug, we pull utility maps and walk the property with you. In Andover, FL‘s 1950s-1970s CBS neighborhoods, original sewer lines are often clay or cast iron, and electrical panels may be 100-amp service that can’t handle an ADU load. We mark existing lines, identify the meter location, and flag trees, fences, or hardscape that affects access. You’ll decide here whether to upgrade to 200-amp service now or plan for it later - doing it during site prep saves $2,000-$4,000 versus a separate permit pull.
Stage 2: Demolition and Rough Grading (Days 4-8)
If we’re building on an existing slab, we assess whether it can bear the ADU load or needs removal. Many Andover homes have thin, un-reinforced patio slabs that won’t pass inspection for a permitted structure. We strip those out, haul off debris, and rough-grade to direct water away from both the new build and your existing foundation. You’ll choose here: keep and reinforce an existing slab, or pour new footings to current Florida Building Code depth - usually 18-24 inches in this water table.
Stage 3: Foundation and Drainage (Days 9-18)
This is where Andover’s climate reality hits. With the water table at 2-5 feet below grade, we install perimeter drainage and often a sump pit before pouring footings. For slab-on-grade ADUs, we spec vapor barriers and rigid foam insulation that older neighborhood builds skipped. You’ll pick your foundation type: monolithic slab (faster, lower cost), stem wall with crawl space (better for plumbing access, adds $4,000-$8,000), or elevated pile foundation if you’re in a flood-prone pocket of 33023.
Stage 4: Utility Rough-In (Days 19-28)
Water, sewer, gas if applicable, and electrical all get trenched, bedded, and stubbed to the ADU footprint. In Broward County’s HVHZ jurisdiction, every material down to the PVC schedule and copper gauge gets inspector scrutiny. We handle the permit pulls, but you’ll need to decide on tankless versus tank water heater location, whether to run a separate sewer lateral or tie into your existing line, and if you want EV charger prep in the ADU garage or carport.
Stage 5: Inspection and Pad Prep (Days 29-35)
County inspectors verify trench depth, bedding material, slope on sewer lines, and electrical panel load calculations. Once we pass rough inspections, we backfill with compacted stone, pour the final slab or set block, and hand off a clean, measured pad to the framing crew. You’ll do a walkthrough with us to confirm utility stub locations match your ADU floor plan before the next phase begins.
The Spec Choices That Move Your Price and Performance
ADU site prep and utilities isn’t one-size-fits-all. Here are the real decisions we walk Andover homeowners through:
- Foundation type: Monolithic slab runs $8,000-$15,000 for a typical 400-600 sq ft ADU footprint in Andover. Stem wall adds $4,000-$8,000 but gives you plumbing access without jackhammering concrete later. If your lot sits low or near drainage swales common in 33023, elevation may be non-negotiable.
- Electrical service upgrade: 100-amp to 200-amp panel swap with underground service lateral runs $3,500-$7,000. Some older Andover homes still have overhead drops that FPL won’t allow for new ADU meters - underground conversion adds $2,000-$5,000.
- Water and sewer lateral: Tapping into existing lines costs $2,500-$5,000 if they’re modern PVC within 30 feet. Original clay or cast iron? Replacement to the main adds $5,000-$12,000, and we’ve seen it in roughly half the 1960s-era homes we work on here.
- Drainage system: Basic French drain and grading runs $1,500-$3,500. Full perimeter drain with sump pump, battery backup, and discharge to street swale: $4,000-$8,000. Given Andover’s wet season volume, we typically spec the more robust system - it’s not where you want to save $2,000 and flood your new slab.
- Vapor barrier and sub-slab insulation: Code minimum 6-mil poly versus 15-mil reinforced with 2-inch XPS foam. The upgrade runs $800-$1,500 but cuts moisture issues that plague unconditioned Florida slabs.
What ADU Site Prep & Utilities Costs in Andover, FL
For Home Additions & ADU site prep and utilities as a standalone scope in Andover, expect $45,000-$130,000. That range spans a simple slab-and-rough-in on a flat lot with modern utilities, up to full service upgrades, foundation replacement, and engineered drainage on a challenging 1960s CBS property.
Five factors push you toward the high or low end:
- Existing utility condition: Modern PVC sewer and 200-amp panel? You’re at the lower end. Original clay sewer, galvanized water, and overhead electrical? Budget for replacement.
- Lot topography and drainage: Andover’s flat terrain hides poor drainage. Properties that pond during summer storms need engineered solutions that add $5,000-$15,000.
- Foundation requirements: Reusing an existing reinforced slab saves significantly versus new footings to 24-inch depth with stem walls.
- Permit scope and HVHZ compliance: Broward County’s strict inspections mean no shortcuts on materials or methods - but also no re-do costs from failed inspections.
- Utility run distance: ADU set far from the main house, or main lines located at the street edge of a deep lot, add trenching and material linear footage.
Our written estimates itemize each of these line items: demolition, grading, drainage, foundation, electrical rough-in, plumbing rough-in, gas if applicable, permits, and inspection fees. What they don’t include: finish electrical fixtures, plumbing fixtures, Backsplash, Tile & Flooring - Andover, or the ADU structure itself - those sit in the construction phase that follows.
Why Andover Homes Make This Job Different
ZIP 33023 sits in one of Florida’s strictest construction jurisdictions, and that reality shapes every ADU site prep and utilities job we do here. Broward County’s High-Velocity Hurricane Zone means inspectors verify Miami-Dade or Florida Product Approval numbers on every structural and envelope material - including the fasteners, anchors, and connectors we embed during foundation work. Out-of-county crews regularly get stopped on this check, but we source HVHZ-approved products from the start.
The housing stock itself tells the bigger story. Andover’s concentration of 1950s-1970s CBS homes means we routinely open up walls to find no hurricane straps at the roof-to-wall connection, original terrazzo over thin slabs, and electrical panels that predate grounded outlets. When we pull permits for an ADU, the county often requires bringing portions of the existing structure up to current code - not the full house, but the systems that tie into it. That layered compliance is why we always start with a thorough site survey rather than a per-square-foot quote.
Water is the other local factor. That 2-5 foot water table and 60-plus inches of annual rainfall mean drainage isn’t an afterthought here. We’ve seen trenches fill overnight during June storms. We plan for it, and we build systems that keep working when the afternoon deluge hits.
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 - ADU Site Prep & Utilities in Andover
Most jobs run 4-6 weeks from utility locate to final pad prep, with Broward County inspection scheduling adding 3-5 business days between rough-in and backfill. Call (844) 665-0162 and we’ll confirm current inspection lead times - they vary seasonally.
Yes - site prep, foundation, and utility rough-in each carry their own permit under Broward County’s phased inspection process. We pull all permits as part of our scope, and the ADU structure permit gets issued only after these pass.
You can tie into existing lines if they’re modern and adequately sized, but many Andover homes need service upgrades or lateral replacements to handle the additional load. During our site survey, we test flow rates and panel capacity to give you a real answer for your specific property.
The lowest-cost path is a monolithic slab on a flat lot with modern PVC sewer, copper water, and 200-amp electrical already in place - that puts you near the $45,000 end. Cutting corners on drainage or foundation depth to save money typically costs more in repairs within five years.
We warranty our workmanship on foundations, drainage systems, and utility rough-in for the period specified in your contract. Manufacturer warranties apply to specific materials like sump pumps, electrical panels, and PVC piping. We document every product approval number for your records, which matters for resale and insurance in HVHZ zones like Andover.
Ready to Talk Through Your Andover Property?
ADU site prep and utilities in Andover isn’t a guesswork job - it’s a sequence of specific decisions shaped by your lot, your existing systems, and Broward County’s HVHZ requirements. Call (844) 665-0162 to schedule a free on-site estimate. We’ll walk your property, flag the utility paths, explain what your existing home needs, and hand you a written estimate with real numbers and a timeline you can plan around.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Andover and South Florida homeowners since 2015.