Fast, Reliable Home Additions & ADU Across Naples
A home addition or ADU in Naples costs $45,000-$220,000, shaped far more by salt air and flood maps than by square footage alone. We bring over 42 years of local building experience to every foundation we pour in Collier County, from Old Naples tear-downs to new detached units in Pelican Bay. Call (844) 638-7249 to schedule your free estimate and design consult - we answer live, 24/7.
Why Groundwork Construction Co. of Fort Myers Is Naples’s Preferred Home Additions & ADU Company
Naples homeowners don’t need another contractor who learned coastal code on their dime. We have pulled permits through Collier County’s post-Ian flood-map revisions, redesigned footings mid-project when ABFE maps changed, and swapped standard anchors for marine-grade stainless on elevated ADUs within sight of the Gulf. That experience sits in our truck with us every morning we drive into town.
Derek Hollenbeck leads a team of background-checked, uniformed technicians who treat Naples permits, inspections, and material specs as baseline requirements, not afterthoughts. Our 730-Day Done Right Promise means the ADU we build today will still be structurally sound through the next three hurricane seasons. Calls to (844) 638-7249 get a live person immediately - no voicemail black holes, no waiting until Monday morning when a county deadline is looming.
Visit our Home Additions & ADU team to explore the full scope of what we build, and see what Naples homeowners have trusted us to deliver in Naples.
Our Home Additions & ADU Services in Naples
ADU Design & Permitting
Design and permitting in Naples is the part most builders under-price and under-plan. We handle everything from site-survey evaluation against the current Advisory Base Flood Elevation to the structural drawings that satisfy Collier County’s post-Ian wind-load requirements. If the parcel sits west of Tamiami Trail or within 1,500 feet of the Gulf, we design for 160-mph impact-rated openings from the first sketch, because that is what code demands.
New Detached ADU
A new detached ADU in areas like Aqualane Shores or Port Royal starts with an engineered pier system, not a slab. Our crew recently broke ground on one where the flood map changed after we had already formed footings. We paused, redesigned the elevation to 14 feet NGVD, and switched to Type 316 stainless anchoring bolts - anything less seizes with rust before the stucco cures. That is the standard we build to here, because in Naples the cheap spec costs more within a decade.
Garage Conversion ADU
Converting an existing Naples garage into a living unit triggers the same wind-mitigation and impact-glass requirements as new construction. Older homes in Old Naples and bayfront neighborhoods often have CBS block walls that survived Ian structurally but need new tie-downs and window retrofits to pass a final inspection. We pull the permits, order marine-grade Andersen or Pella windows, and handle the entire conversion from utility rough-in to final finish.
Junior ADU & Interior Conversion
For a basement - Naples does not have them - we convert interior square footage instead. A junior ADU inside an existing floor plan, typically 500 square feet or less with a separate entrance and kitchenette, makes sense in older Naples homes where a ground-floor bedroom suite can become a private rental unit. Even interior conversions here must address the high water table during any below-grade plumbing work, which we handle with sump-ready rough-ins and backflow prevention the county now requires.
ADU Site Prep & Utilities
Naples sits on compacted fill atop former mangrove swamp, and the water table sits 18 to 24 inches below grade across most of the city. Every utility trench, every electrical conduit run, every drain-line tie-in must account for saturated soil and the corrosion it accelerates. We run Schedule 80 PVC for underground electric, spec Type 316 stainless for all below-grade fasteners, and install pump-ready sewer ejectors on any unit where the finished floor elevation is below the city main inversion.
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.
Trusted Brands We Service in Naples
We specify only what the coastal environment demands. For hardscape around Naples ADUs - patios, walkways, pool-deck surrounds - we install Tremron and Techo-Bloc pavers with polymer-fortified joint sand that will not wash out in a summer squall. Unsealed sand-set joints fail here within a single calendar year of daily salt mist and heavy afternoon rain. The paver spec you see across Fort Myers will not survive in Naples. We also use Cambridge Pavers with factory-sealed surfaces on projects within a half-mile of the Gulf, because the extra dollar per square foot saves a tear-out within three years. When you call (844) 638-7249, we can walk you through the material options that match your lot’s exposure before the first shovel breaks ground.
Common Home Additions & ADU Problems We See in Naples Homes
- Zinc-plated anchors and joist hangers on elevated ADUs near the Gulf. Visible rust blooms appear in under six months on standard hardware used within a half-mile of salt water. Structural shearing follows within five years. We use Type 316 stainless on every hanger, bolt, and strap from the pier tops up.
- Inland-grade aluminum window frames without marine conversion coating. Pitting and white corrosion eat through the powder coat in two rainy seasons. The impact rating voids itself before the next hurricane. Our window orders for Naples carry the full AAMA 2605 marine-grade finish, on Andersen or Marvin frames, every time.
- Sand-set pavers without polymer-fortified joint sand. Daily salt mist, tropical downpours, and the high water table heave a loose-sand base within months. We compact a crushed-concrete sub-base, add a geotextile separation layer, and lock joints with polymer sand rated for vehicular loads if the ADU driveway or parking pad joins the patio.
- Undersized or unsealed underground conduit in high-water-table lots. Water intrusion into electrical conduit is a recurring Naples problem, especially when the water table rises during a wet-season storm week. We spec Schedule 80 PVC with solvent-welded joints and pull THWN-2 conductors rated for continuous wet location - exactly as NEC Article 300 requires for direct-burial in saturated soil.
Pricing for Home Additions & ADU in Naples, FL
Naples ADU pricing reflects the gap between what standard inland construction costs and what coastal-spec materials and post-Ian permitting actually require. An ADU built to Collier County’s wind-load and flood-elevation standards typically runs 18% more than the same square footage built ten miles inland. That premium is not optional - it is the cost of a structure that will not be rust-seized, storm-torn, or flagged by an inspector before the third hurricane season. Below are the ranges we quote in Naples today.
| Project | Naples Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Impact Window Installation (marine-grade) | $8,000-$25,000 |
The range on an ADU shifts with elevation requirements, utility run distance, window spec, and interior finish level. We give every Naples homeowner a written line-item quote with upfront pricing and no surprises. Call (844) 638-7249 for your free project estimate and design consult. The number you see is the number you pay.
We Also Serve Cities Near Naples
Our crews work across Naples and regularly serve Bonita Springs, Marco Island, Estero, and Fort Myers Beach. Whether you are expanding a bayside property in Marco or adding a detached unit in Estero, we pull the right permits, spec the correct materials for the site, and schedule your free estimate within days. Call (844) 638-7249 - we answer live.
Serving Naples, FL - Our Local Coverage Area
We’re based in the Naples area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Naples
Collier County requires impact-resistant openings (windows and doors rated for design wind speeds exceeding 160 mph), reinforced roof-to-wall connections, and corrosion-resistant fasteners on all structural components for ADUs within 1,500 feet of the Gulf. In practice, this means Type 316 stainless steel anchors, joist hangers, and strapping from the foundation up, plus AAMA 2605 marine-grade finish on aluminum window frames. Standard zinc-plated hardware will fail inspection at rough framing. Call (844) 638-7249 if you need a coastal-spec quote.
A post-Ian Advisory Base Flood Elevation change can add four to eight weeks to a Port Royal ADU timeline and $15,000-$40,000 to the budget, depending on how far the footing elevation must rise and whether the foundation type must switch from slab to pier. We have seen ABFE maps change mid-project after footings were already formed, forcing a full redesign, re-permitting, and re-inspection. The budget impact hits hardest in foundation steel, additional fill, and the extended structural engineering hours. We build that contingency into every Naples proposal now because the county’s map amendments are still being finalized.
Naples’s daily salt mist, intense afternoon squalls, and high water table destroy standard sand-set paver joints in under a year. In Fort Myers, where the water table is lower and salt exposure lighter, loose-joint sand holds up. Here, we use polymer-fortified joint sand that hardens after wet curing and resists washout, ants, and weed penetration. Without it, joints empty, the base heaves, and pavers shift out of plane. The material costs more per bag but avoids a $4,000-$8,000 hardscape redo. Call us for exact numbers on your patio scope.
An inland-spec ADU uses standard-galvanized hardware, builder-grade windows, and sand-set pavers - fine in Fort Myers or Estero but structurally inadequate in coastal Naples. A coastal-spec ADU uses Type 316 stainless fasteners, impact-rated windows with marine conversion coating, polymer-fortified paver joints, and elevated foundation systems designed for the current ABFE. The coastal spec costs about 18% more upfront and pays for itself by avoiding a rust-driven structural tear-out within five years, an insurance claim denial after the next named storm, or a failed building inspection. In Naples west of Tamiami Trail, coastal-spec is the only buildable spec.
The water table sitting 18 to 24 inches below grade means every underground electrical conduit and sewer lateral sits in saturated, brackish soil for months each year. Conduit leaks create energized wet ground, and corroded drain lines collapse under backfill weight. We spec Schedule 80 PVC with solvent-welded joints for all below-grade conduit, pull THWN-2 conductors rated for continuous wet location, and install backflow-prevention valves on sewer ties. These are not optional upgrades - they are what the conditions demand. For a site-specific rundown, call (844) 638-7249 and we will walk your lot before quoting.
Call Groundwork Construction Co. of Fort Myers for Naples Home Additions & ADU
A Naples ADU is a long-term investment in a market where salt air, storm surge, and shifting flood maps punish shortcuts harder than anywhere else in Florida. We pull the permits. We spec the materials that survive. We warranty the work for 730 days. We answer the phone. Call (844) 638-7249 to schedule your free project estimate and design consult. The coastal-spec premium is not a markup. It is the difference between a structure that lasts and one that does not.
Written by Derek Hollenbeck, Owner at Groundwork Construction Co. of Fort Myers, serving Naples since 2014.