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
Adding square footage to your Naples home, whether it’s a ground-floor room addition off the lanai or a fully detached ADU in the backyard of an Old Naples property, typically runs $45,000 to $220,000 in this market. That range reflects what we actually see: a modest interior conversion on the low end, a custom detached ADU with impact-rated glazing and elevated foundation on the high end. We’ve been building in Naples long enough to know that your project isn’t just a set of plans. It’s a sequencing problem. Permit backlogs, custom millwork lead times, and a water table that sits 18 to 24 inches below grade all shape the schedule more than any framing crew ever will. If you’re weighing a Home Additions & ADU project, call us at (877) 610-1318 and we’ll walk the property with you.
Why Barrett & Sons Construction Is Naples’s Preferred Home Additions & ADU Company
We’re a family-run operation out of our South Florida office, with crews that work Naples jobs directly. Tom Barrett founded this company in 1998, and his sons run crews on-site most days. That’s the difference. When you call, a live person answers, not a voicemail tree in another state. When something goes sideways, the guy whose name is on the truck hears about it first, not a regional manager three time zones away. Naples homeowners have dealt with enough out-of-town contractors who quote one number and bill another. We put every scope, every allowance, and every change order in writing before a nail moves. The permit inspector works for you, not for us. That’s exactly why we like him.
We’ve done additions and ADUs throughout Naples, from canal-front lots in Port Royal to mid-century cottages in Old Naples and newer builds in North Naples gated communities. Each pocket of this city has different soil, different HOA rules, different elevation requirements. We know the difference between a lot off Gulf Shore Boulevard where the water table demands active dewatering and a lot off Livingston Road where slab prep is straightforward. That local knowledge isn’t something you can fake from a call center. It comes from standing on the site.
Our Home Additions & ADU Services in Naples
Room Additions
A ground-floor room addition in Naples usually means extending off the back of a mid-century CBS cottage or adding a master suite to a 1980s ranch in East Naples. The structural work matters, but so does matching rooflines, stucco textures, and floor elevations. On a canal-front lot off Gordon Drive in Port Royal, our crew framed a second-story addition with load-bearing LVL beams and pre-engineered truss packages, coordinating with the architect to specify impact-rated architectural glass and custom Cambria waterfall island tops. Because the water table sits 18 to 24 inches below grade, our site prep included active dewatering and a hydrostatic-pressure slab detail before rough-in. With front-loaded wind-load calcs and elevation certificates, we pulled permits and locked the fixed scope of work in writing before ordering, keeping the draw schedule on track through Collier County inspection sign-off.
Second Story Additions
Going up instead of out is often the only option on tight Naples lots, especially in Old Naples and Aqualane Shores where yard space is scarce and setbacks are strict. A second-story addition in Naples typically means re-engineering the existing CBS walls to carry new load, and that means a third-party wind-load calculation before the permit gets pulled. We don’t skip that step. Skipping it is how a four-week permit becomes a six-month stall in the post-Ian Collier County backlog. Then there’s the glazing. Hurricane-rated windows for a second story in Naples run significantly more than standard glass, and if your allowance wasn’t written to match, you’ll get a change order for $15,000 to $25,000 after framing starts. We write the allowance correctly the first time.
ADU Design & Permitting
A detached ADU in Naples isn’t a shed with plumbing. It’s a new dwelling unit, subject to the same wind-load, flood elevation, and impact-glazing codes as a primary home. That’s the part most people learn the hard way. In 34102 and 34103, the post-Ian scrape-and-rebuild wave has pushed Collier County inspectors harder than at any point in the last twenty years, and permits that used to clear in weeks now take months unless the documentation is front-loaded. We bring pre-engineered truss packages, stamped wind-load calcs, and elevation certificates to the counter on day one. We know exactly what the county wants to see because we’ve been through it a hundred times since 2022.
Junior ADU & Interior Conversion
A junior ADU, a carved-out section of your existing home with its own entrance and kitchenette, is the fastest path to rental income or an in-law suite in Naples. Interior conversions don’t face the same flood-elevation hurdles as detached structures, but they still need proper egress windows, fire separation, and electrical panel upgrades in older homes. We’ve converted garages, pool cabanas, and under-used wings in homes from Naples Manor to Naples Park. The scope gets written down, the price gets fixed, and the work happens on the schedule we agreed to, not the schedule a supplier happened to dictate.
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 don’t install mystery materials off the back of a van. On Naples additions and ADUs we work with KraftMaid and Cambria for cabinetry and stone, Andersen and Marvin for impact-rated windows, and Techo-Bloc for pavers on driveways, patios, and walkways that tie the new structure into the existing landscape. These are brands you can look up before you sign anything. And because we order through the same suppliers on every Naples job, we can usually get materials staged faster than a contractor who’s cold-calling suppliers for the first time. On a market where 12-to-16-week lead times on custom millwork are common, having standing relationships with those suppliers is the difference between closing in March and closing in July.
Common Home Additions & ADU Problems We See in Naples Homes
- Under-bidding impact-rated glazing. A second-story addition or sunroom in Naples has to meet hurricane codes, and impact windows and doors cost meaningfully more than standard glass. We see change orders in the $15,000 to $25,000 range on jobs where the original scope didn’t account for it.
- Waiting to order custom millwork until after demo. KraftMaid and Wellborn cabinetry can run 12 to 16 weeks from order to delivery. If you demo first and order second, your punch list lands months after your season ends.
- Ignoring the water table. In much of Naples, groundwater sits less than two feet below grade. A slab pour without a hydrostatic-pressure detail and active dewatering will crack, heave, or wick moisture into your new addition. We see it on jobs other crews started and couldn’t finish.
- Skipping third-party wind-load calcs before pulling permits. The post-Ian Collier County inspection backlog is real. Front-load the engineering and the permit moves. Skip it and you’ll watch the dry season pass you by.
Pricing for Home Additions & ADU in Naples, FL
Here’s what we see in the Naples market, in real numbers. A ground-floor room addition runs $45,000 to $130,000 depending on square footage, glazing, and finishes. A detached ADU built to current Collier County code runs $90,000 to $220,000. A garage conversion, which is usually the least expensive way to create a rentable unit, runs $30,000 to $80,000. The wide ranges aren’t vagueness. They’re the difference between builder-grade and custom-grade, between standard glass and impact-rated glazing, between a simple gable and a complicated hip roof with architectural details. We write the scope of work in advance, line by line, and we fix the price in writing before we order materials. No surprise invoices. Call (877) 610-1318 and we’ll give you a free estimate with real numbers for your specific property.
| Project Type | Typical Naples Cost Range |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
We Also Serve Cities Near Naples
Our crews work Naples jobs every week, and we extend the same written-scope commitment to the surrounding communities. That includes Golden Gate, Naples Manor, East Naples, and Naples Park. When you call (877) 610-1318, you’ll get a straight answer about scheduling and coverage in your specific neighborhood. No call-center script, no runaround.
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
The backlog affects your timeline most when documentation isn’t front-loaded. Since Hurricane Ian, Collier County permits that once cleared in weeks have stretched to months, especially for additions and ADUs in 34102 and 34103. Experienced Naples contractors responded by bringing pre-engineered truss packages, stamped wind-load calculations, and elevation certificates to the counter on day one. That’s what keeps a project moving when the county is overwhelmed. A contractor who files first and engineers later watches the dry season pass. Call (877) 610-1318 and we’ll tell you exactly where your project would sit in the current queue.
Because if the scope isn’t fixed in writing before materials are ordered, the price isn’t fixed either. An allowance that isn’t on paper is a surprise waiting for a date. On a Naples ADU, the big-ticket items are impact-rated windows, custom cabinetry, and structural packages that can take 12 to 16 weeks to arrive. We establish the scope, the allowances, and the price in writing first. Then we order. That sequence is the only way to guarantee that the bill you agreed to is the bill you pay.
Yes, in most cases. CBS construction means concrete block stucco, and those 1960s walls are typically strong enough to carry a second story, but they have to be verified, not assumed. We bring in a structural engineer, run wind-load calculations, and check the existing footings. On some older Naples homes the footings are undersized for vertical load and need reinforcement before framing starts. The answer is almost always yes, but the path depends on what the engineer finds, and we’d rather find it before we pour concrete than after.
We assume groundwater is 18 to 24 inches below grade until proven otherwise, because in much of Naples that’s exactly where it sits. That means active dewatering during excavation, a slab detail engineered for hydrostatic pressure, and often a vapor barrier spec that goes beyond what inland contractors bother with. Basements are impossible here. Slabs have to be designed to resist upward water pressure or they’ll crack and wick moisture for decades. It’s not complicated work, but it has to be specified correctly before the pour.
Yes. Impact-rated windows and doors run meaningfully more than standard glazing, often adding $15,000 to $25,000 to a second-story addition or large sunroom depending on the number of openings and the product line. It’s not optional in Naples. Collier County code requires impact resistance or full shutter coverage on new construction and additions. The mistake we see is contractors who write the allowance for standard glass, then hand you a change order after framing starts. We write the correct allowance from day one. Call (877) 610-1318 for a free estimate with the glazing priced the way it actually needs to be.
Get a Real Estimate From a Contractor Who Answers the Phone
We’re not the cheapest bid in Naples, and we won’t pretend to be. We’re the contractor who writes the scope in advance, fixes the price in writing, pulls permits on every eligible job, and puts the owner’s name on the truck. Tom Barrett founded this company in 1998. His sons run crews on-site. A live person answers the phone 24/7, and when you call (877) 610-1318, you’ll talk to someone who can actually schedule your free estimate, not a call center screening calls. We also offer a free second opinion on any written estimate you’ve already received, and we take $40 off any repair over $200. Senior and veteran discounts are permanent. The work gets done right, or Tom comes back. That’s the 90-Day Done Right Promise, and it’s written on every contract we sign in Naples.
Written by Tom Barrett, Owner at Barrett & Sons Construction. Tom founded the company in 1998 and has spent the years since building additions and ADUs across South Florida, including the post-Ian rebuilds in Naples’s Old Naples and Port Royal neighborhoods. The name, license number, and address are published and verifiable. Look it up before you sign anything.