What ADU site prep and utilities actually looks like in Plantation, FL
ADU site prep and utilities in Plantation runs between $15,000 and $45,000 as a standalone scope and is realistically a 4-to-8-week phase depending on how much underground work your property requires. This is the part of the project where we establish the physical footprint, bring power and water to the unit, and get the rough grading and drainage right before anyone pours a slab. Call (844) 638-7249 when you’re ready to talk through what your specific lot needs - we answer live and can schedule a walkthrough that gives you a real number, not a rough guess.
What the site prep and utility phase includes, stage by stage
Most Plantation homeowners haven’t done major ground-up work on their property before, so the sequence can seem opaque. Here is how we run it and what you decide at each point.
1. Site survey and utility locate (days 1-4)
Before any dirt moves, we pull a property survey and mark existing underground utilities - water, sewer, electric, gas if present. On Plantation lots built between the late 1950s and mid-1980s, original water and sewer laterals are often in different places than modern as-builts show, and we’ve found clay sewer pipes, corroded galvanized supply lines, and undocumented irrigation sleeves that change the tie-in plan. You’ll decide during this window whether to run trenching from the street or tap off the main house’s existing service, which is the single biggest cost variable in utility work.
2. Clearing, demolition, and rough grading (days 4-10)
If the ADU site has old patio slabs, a shed, overgrown landscaping, or a carport, we demo and haul it. Then we rough-grade the pad area. Plantation sits on a flat limestone shelf with a seasonally high water table, so grading isn’t just about leveling - it’s about establishing positive drainage away from both the main house and the future ADU. We’ll bring in compacted fill if the lot slopes toward the house, which is common in older split-level sections of town where original grading has settled over 50 years.
3. Trenching and utility runs (days 8-18)
We trench for water supply, sewer, and electrical conduit. The depth and path matter enormously: if the ADU is at the back of a deep Plantation lot, the trench run adds hundreds per linear foot. We pull permits through Broward County’s building jurisdiction and coordinate the underground inspection before anything gets backfilled. Homeowners choose at this stage whether to run a separate electrical meter for the ADU or sub-panel off the main house - separate metering costs more upfront but gives you cleaner rental billing later. The same choice exists for water: a dedicated meter versus a sub-meter.
4. Foundation prep and underground rough-in (days 15-25)
Once trenches are inspected and backfilled, we form the slab perimeter, lay vapor barrier, tie steel rebar, and stub up plumbing and electrical conduits through the slab. In Plantation we use termite pre-treatment under every slab - it’s a non-negotiable here, and the Broward County inspector will check for the treatment certificate. If we’re doing a stem-wall foundation instead of a monolithic slab, this stage adds about a week for block work and the stem-wall inspection before the slab pour.
5. Backfill, final grade, and temporary power (days 20-30+)
After the slab cures, we backfill around the foundation, final-grade the surrounding yard for drainage, and set a temporary power pole if FPL hasn’t energized the permanent service yet. If we hit hurricane season - June through November - this stage can stretch because county inspections slow down substantially. We plan around that reality from day one. Once this stage passes final inspection, the Home Additions & ADU in Plantation framing crew can start the next day.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
The choices that shape your site prep scope
Every ADU site in Plantation is a little different, but the decisions below are the ones that actually move the budget and timeline. We walk you through each during the estimate so nothing surprises you later.
- Utility tie-in point: main house versus street. Tapping off the main house’s existing water, sewer, and electrical panel is less expensive - roughly $4,000-$9,000 depending on distance. Running new laterals from the street main can push past $18,000 if the ADU is at the back of a deep lot. Plantation homes with original galvanized supply lines or cast-iron sewer laterals often can’t support a second dwelling without upgrading the main line first, so the tie-in decision forces a conversation about the condition of what’s already underground.
- Foundation type: monolithic slab versus stem-wall. A monolithic slab is faster and costs about $8-$14 per square foot in this market. A stem-wall foundation with a raised floor adds $15-$22 per square foot but gives you a crawlspace for plumbing access and gets the finished floor above grade, which matters on Plantation lots where the water table sits high and heavy summer rain pools near the house. We recommend the stem-wall option on any lot that has shown standing water after a storm, even once.
- Electrical metering: separate versus sub-panel. A dedicated meter from FPL with its own service drop runs $2,500-$5,000 depending on transformer distance. A sub-panel fed from the main house costs half that but means the ADU’s electrical load counts against your existing service. Homes built in the 1960s and 1970s with original 100-amp or 125-amp panels frequently can’t support a sub-panel for a one-bedroom ADU without a service upgrade, and we’ll tell you that upfront before you make the call.
- Drainage and hardscape integration. The flat topography across Plantation means every impervious surface - driveway, walkway, patio - affects where water goes. Our home additions & adu crew works with our paver and concrete teams to plan the ADU’s hardscape tie-ins from the start. If you want the ADU’s walkway and patio done in Techo-Bloc or Tremron pavers to match the main house, we spec that during site prep so the grades are set correctly from day one. Retrofitting drainage after the slab is poured costs easily double what doing it right the first time costs.
What ADU site prep and utilities costs in Plantation, FL
As a standalone scope, ADU site prep and utilities in Plantation runs $15,000 to $45,000. That range covers everything from clearing and demolition through the final foundation inspection, with utilities stubbed and ready for framing. Where your project lands inside it depends on five things.
Trenching distance. The single biggest variable. A 30-foot trench from the main house costs one number. A 110-foot trench from the street with a new sewer lateral, new water line, and new electrical conduit is a different job entirely. Every linear foot past roughly 50 feet adds $80-$150 in combined trenching, conduit, and backfill costs on Plantation’s typical limestone substrate.
Existing utility condition. If your home still has its original 1965 cast-iron sewer line or a 100-amp Federal Pacific panel, those need upgrading before the ADU can tie in, and that work lands in this phase. We have seen clay tile sewer lines on some of the earliest Plantation subdivisions that crumble the moment we expose them. That’s not a surprise we spring on you - it’s exactly why we inspect before quoting a fixed number.
Foundation choice. Stem-wall costs more than monolithic slab and takes longer, but on lots with documented drainage issues it’s the right call. We won’t push you either way, but we will tell you what we’d do on our own property after we see how water moves across your lot during a heavy afternoon storm.
Permit and inspection scope. Plantation falls under Broward County’s building jurisdiction. Broward’s wind-load and structural requirements sit between Miami-Dade’s stricter HVHZ rules and Palm Beach’s lighter documentation expectations, so permit submittals that look right to a Miami-Dade contractor are over-engineered here and ones from a Palm Beach contractor get kicked back. We know exactly what Broward plan reviewers want to see, which keeps your permit moving. Inspection scheduling during hurricane season will add days to the timeline no matter who your contractor is - we build that buffer into the schedule from the start.
Soil and fill conditions. Some Plantation subdivisions were built on compacted fill that has settled evenly. Others sit on thin topsoil over limestone that requires rock excavation just to get a trench to depth. We don’t know which you have until we dig a test hole, and we include that in our estimate so the price you see is the price you pay. Homeowners adding an ADU often pair this work with a Small & Partial Kitchen Remodels in Plantation or a Full Bathroom Remodeling in Plantation inside the main house, and we can coordinate both scopes under one plan set.
What Plantation homes specifically do to this job
Plantation was built as a master-planned community almost entirely between the late 1950s and the mid-1980s, and that concentrated construction window means whole neighborhoods now cycle into renovation and ADU addition at the same time. The homes are overwhelmingly single-story and two-story CBS - concrete block and stucco - on slab foundations with flat or low-pitched roofs. From a site prep standpoint, the uniformity helps: we know what we’re going to find underground in most subdivisions because we have already done the work on the same floor plan three streets over.
What we routinely see on Plantation jobsites are original terrazzo or slab floors that hide aging cast-iron waste lines, electrical panels that cannot carry the extra load of an ADU without a service upgrade, and lot drainage that was designed for a single structure and now has to be rethought for two. The water table sits high here - 8 to 10 feet above sea level on a flat limestone shelf - so any ground-disturbing work has to account for subsurface water intrusion and soil bearing capacity in ways that a contractor working in drier inland cities never thinks about. Broward County inspectors expect to see that accounted for in the foundation plan submittal, and a permit package that skips the drainage and water-table detail will sit on a reviewer’s desk for weeks. Our team knows the inspection thresholds and the specific details Broward wants to see, which gets your job through permitting faster than someone driving in from another county who has to learn the local rhythm on your dime.
Every permitted ADU in Plantation must comply with the Florida Building Code’s Broward County wind-load requirements. The hurricane season inspection bottleneck from June through November is real, and we schedule around it. If your site prep phase overlaps with a named storm, we secure the site, pause, and resume as soon as inspections reopen - but we tell you that timeline reality before you sign anything.
Serving Plantation, FL - Our Local Coverage Area
We’re based in the Plantation 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 and utilities in Plantation
Plan on 4 to 8 weeks from the day we set up the site to the day the foundation passes final inspection. The shorter end applies to straightforward lots with short trench runs and no existing utility upgrades needed. The longer end accounts for deep-lot trenching from the street, service panel upgrades, stem-wall foundations, and hurricane-season inspection delays. We give you a week-by-week schedule at contract signing and update it as each inspection clears.
Yes. Every piece of this phase - clearing, grading, trenching, foundation, underground plumbing, underground electrical, and the final foundation inspection - requires a Broward County permit and a passed inspection before the next phase can start. Our permit submittal includes a site plan, foundation engineering, utility tie-in details, and drainage calculations. We pull the permits; you do not need to navigate Broward’s building department yourself. Call (844) 638-7249 if you want to discuss what the permit timeline looks like for your specific lot.
Usually no, and here’s why. Most Plantation homes built before 1980 have 100-amp or 125-amp electrical services that cannot legally support an additional dwelling unit, and many still have original cast-iron sewer laterals that are near the end of their service life. Even if the ADU ties into the main house rather than the street, the existing service almost always needs an upgrade - a 200-amp panel replacement, a new sewer lateral connection, or both - and that work lands squarely in the site prep and utilities phase. We’ll show you exactly what your existing utilities can and can’t handle before we give you a price.
Our written estimate for ADU site prep and utilities in Plantation includes clearing and demolition, rough grading, all trenching, water and sewer line installation up to the stub-out, electrical conduit and panel or sub-panel installation, foundation forming and pouring, termite pre-treatment, backfill, final grading, and every permit and inspection fee for this phase. It does not include the ADU framing, roofing, drywall, finishes, or fixtures - those are quoted in the construction phase scope. It also does not include FPL’s separate fee for a new service drop if you choose dedicated metering. We itemize every line so you see exactly what you are paying for, and our pricing is fixed once the scope is set. The number you see is the number you pay. Call (844) 638-7249 to schedule a free on-site estimate.
Every ADU site prep, utility, and foundation job we complete in Plantation is covered by our 730-Day Done Right Promise. If anything in the underground work, foundation, or utility tie-in isn’t right within two full years, we make it right at our cost. That applies to the slab, the trenching, the drainage, the conduit, and every connection we made. It’s one of the longest workmanship guarantees in residential construction, and it’s the reason Plantation homeowners who start one project with us tend to call us back for the next one.
Get a free, no-obligation site prep estimate in Plantation
Every ADU starts underground, and getting the site prep and utilities right is the difference between a project that runs smoothly and one that bleeds money on fixes later. We will walk your Plantation property with you, talk through the tie-in options that make sense for your lot, and hand you a detailed line-item estimate with no pressure and no hidden numbers. Call (844) 638-7249 - a real person answers, day or night - and we’ll set a time that works for you.
Written by Derek Hollenbeck, Owner at Groundwork Construction Co., serving Plantation homeowners with fixed-price ADU site prep and utility work backed by our 730-Day Done Right Promise.