Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Naples
Home additions and ADU construction in Naples typically runs between $45,000 and $130,000, with detached ADUs starting around $90,000. Most projects in Collier County take longer than homeowners expect, not because of labor, but because of permit sequencing, long-lead materials, and inspections. Barrett & Sons Construction has built enough additions in Naples to know exactly where the schedule gets tight, and we fix the scope and price in writing before we order a single cabinet or pour a yard of concrete. Call (877) 610-1318 and we’ll walk the property with you.
Why Barrett & Sons Construction Is Naples’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998, and his sons run the crews today. When we take on a second story addition in Naples or a detached ADU off Gulf Shore Boulevard, you’re getting the Barrett name on the truck and the Barrett family on site. We’re not a franchise dispatching strangers from three counties away.
Our Naples customers deal with one plain fact: the last contractor many of them hired quoted a price over the phone and handed them a different number after demolition started. We don’t work that way. Every allowance, every scope item, every change lands as a written change order before work moves. That’s true whether the job is a $45,000 garage conversion or a $220,000 new detached ADU.
We also carry premium brands you can actually look up: KraftMaid and Cambria for kitchens, Andersen windows, GAF roofing, and Belgard pavers. When a Naples homeowner asks us to match an existing finish or coordinate with a designer, we’re not guessing and we’re not substituting mystery material off a van.
Our Home Additions & ADU Services in Naples
New Detached ADU
A detached ADU in Naples gives you rental income, a guest house, or room for aging parents, without giving up the main house. In the post-Ian rebuild market, we’ve seen the strongest demand in Old Naples, Port Royal, and the neighborhoods around 34102 and 34103, where homeowners are already tearing down and rebuilding. Expect to spend $90,000 to $220,000 depending on square footage, elevation requirements, and finish level. We coordinate the architect, the engineer, and the designer from day one.
Second Story Additions
Bringing a Naples home up instead of out is often the smart play on smaller lots where yard space is scarce. A second story addition runs $45,000 to $130,000 in this market. The structural review here is real: we’re working over aging CBS block, tying into existing slab foundations, and meeting Collier County wind-load standards. We’ve pre-filed truss packages and wind-load calcs on more than one Naples project just to keep the permit from stalling.
ADU Design & Permitting
Collier County’s post-Hurricane Ian permitting surge created inspection backlogs that stretched 6 to 12 months through 2023 and 2024. The contractors who kept schedules on track were the ones who front-loaded documentation: pre-engineered truss packages, third-party wind-load calculations, and elevation certificates filed before the permit application moved. We handle that as part of our ADU design and permitting service for Naples homeowners, and we don’t let you discover the backlog at the wrong end of the schedule.
Garage Conversion ADU
If your Naples home has an attached garage sitting at grade, converting it into a rentable ADU runs $30,000 to $80,000. This is a specific build with its own set of questions: existing slab elevation, flood zone restrictions, and whether the garage’s electrical and plumbing rough-ins can support a living space. In many parts of Naples, the slab was poured decades ago at near-grade, and raising or reinforcing it is sometimes the correct-and honest-answer. We’ll tell you before you spend a dime.
What happens when you call
- 1
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
On Home Additions & ADU projects in Naples, we install materials you can verify. Cambria countertops, Wellborn cabinetry, Kohler fixtures, Andersen windows, and Belgard or Techo-Bloc pavers on the exterior hardscape. No mystery brands. If a designer specifies a slab from Cambria or a window line from Andersen, we order it under a signed allowance and fix the price in writing before the order goes out. That protects you, and honestly, it protects the schedule too.
Common Home Additions & ADU Problems We See in Naples Homes
- Salt air eating standard hardware. Naples sits on brackish canal water and ocean air. Standard fasteners, rebar, and mechanicals corrode faster here than inland. We spec stainless and marine-grade wherever the inspector or the environment demands it, and we’ve watched cheaper builders fail inspection over standard steel.
- The water table is right under your slab. Across much of Naples, particularly in the older eastern sections and parts of 34102 and 34103, the water table sits 18 to 24 inches below grade. Pour a slab without a dewatering plan and you’ll fail the structural inspector’s hydrostatic-pressure review. We’ve seen it happen.
- Custom millwork ordered before the architect signs off. On high-end Naples additions, someone orders $40,000 of custom cabinetry or specialty glass, then the design shifts and the rough-in doesn’t match. Now you own a change order and a pile of materials you can’t return. We don’t order until the drawings are final and the allowance is signed.
- Permit backlogs crushing the schedule. Post-Ian, Naples-area inspections backed up 6 to 12 months. Homeowners who didn’t front-load documentation sat waiting. We pre-file engineering, truss packages, and wind calcs so permitting doesn’t become the project’s slowest year.
Pricing for Home Additions & ADU in Naples, FL
Here’s the honest frame for Home Additions & ADU in Naples:
| Project | Typical Naples Range |
|---|---|
| New Detached ADU | $90,000 - $220,000 |
| Second Story Addition | $45,000 - $130,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
What moves the number is elevation work, foundation repair, impact-rated windows, and the finish level. A teardown-and-rebuild in Port Royal carries different material demands than a garage conversion in East Naples. Whatever the scope, you’ll get a written line-item quote before any work begins, and every change after that arrives as a written change order. Call (877) 610-1318 to schedule your free estimate.
We Also Serve Cities Near Naples
Our crews work across Golden Gate, Naples Manor, East Naples, and Naples Park. If you’re just outside city limits and wondering whether we make the drive, the answer is yes, and the free estimate still applies. We coordinate scheduling from our South Florida office so a local crew can get to you without a week of delay.
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’s post-Ian permitting surge created inspection backlogs of 6 to 12 months through 2023 and 2024, and the system hasn’t fully recovered. The workaround is front-loading documentation: pre-engineered truss packages, third-party wind-load calculations, and elevation certificates filed before the permit application. We do that as standard practice on Naples projects. Call (877) 610-1318 if you want us to review your specific site and timeline.
It depends on your current slab elevation and flood zone. Many Old Naples homes in 34102 sit at or near grade, and Collier County’s post-Ian wind and flood code enforcement is the strictest in the state. In some cases, a garage conversion ADU can proceed without a full elevation raise, but only if the slab and structure meet current requirements. We’ll tell you the truth before you spend money on drawings.
Because custom millwork and Cambria countertop slabs are non-returnable once they’re cut. If we order a $30,000 allowance off a design that isn’t final, and then the architect changes a wall, you own the mistake. We fix every allowance in writing and get your signature before the order goes out. The written change order is your protection, and it’s how we’ve worked since Tom Barrett started this company in 1998.
Yes. Naples salt air and brackish canal water corrode standard fasteners, rebar, and mechanical hardware faster than inland Florida contractors expect. On our sunroom and enclosure projects near the canals, we spec stainless and marine-grade hardware as a matter of course. It costs a little more up front and it’s the right call. Call (877) 610-1318 to have us look at your specific exposure.
Sometimes. A garage conversion ADU in Naples runs $30,000 to $80,000, but the first question is whether the existing slab and elevation meet current Collier County requirements. If the slab is at grade and the water table is 18 to 24 inches down, as it is across much of the city, you may need reinforcement or additional drainage work. We’ll assess that before quoting a number, and the estimate is free.
Ready to Talk About Your Naples Addition or ADU?
You’ve probably been burned by a contractor before, or you know someone who has. Tom Barrett publishes his name, his address, and his license number. Look it up before you sign anything. Then call (877) 610-1318 to schedule your free estimate. We’ll walk the property, talk through what the site actually needs, and put the scope and the price in writing. That’s how we’ve done it since 1998, and it’s how we do it for every Naples homeowner who calls.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Naples since 1998.