Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterFast, Reliable Home Additions & ADU Across Gateway
A home addition or ADU in Gateway typically runs between $45,000 and $130,000 for a standard room addition, with full detached ADU construction ranging from $90,000 to $220,000 depending on size, finishes, and site conditions. The bigger variable in Gateway isn’t the framing or the drywall. It’s the dual approval process: Lee County permits AND your community’s Architectural Review Committee both have to sign off before a single footing gets poured. We’ve been through that dance enough times to know exactly which paperwork comes first and what the review committees in Gateway’s neighborhoods actually flag. So if you’re weighing whether a garage conversion, a second-story bump-out, or a backyard ADU makes sense, call us at (877) 610-1318 and we’ll walk you through what applies to your specific street.
Gateway sits in eastern Lee County, right off SR 82 and Daniels Parkway, on land that was cattle pasture not all that long ago. The homes here are newer than most of southwest Florida’s stock, but they carry their own quirks: HOA deed restrictions on exterior colors and roofing materials, concrete block construction that’s strong but stubborn to modify, and a water table that demands extra care on foundation work during the wet months. Tom Barrett and his sons have worked in enough of these communities to know what gets approved, what gets flagged, and what turns into an expensive hassle if you skip a step.
Call (877) 610-1318 for a free estimate on any addition or ADU project in Gateway.
Why Barrett & Sons Construction Is Gateway’s Preferred Home Additions & ADU Company
We’re not a franchise. Tom Barrett started Barrett & Sons in 1998, and his sons run the crews that show up in Gateway. That means you’ll see the same faces from the estimate to the final walkthrough, and you’ll talk to a live person when you call, no matter the hour.
Gateway homeowners have a particular reason to appreciate how we work. Every scope change is a written change order before work starts. Every permit gets pulled. Every inspection gets signed. If you’ve ever sat through the county plus HOA approval process with a contractor who “handles permits later,” you know why we lead with the paperwork. The permit inspector works for you, not for me – that’s why I like him.
Calls to our Miami (South FL) office are answered by a live person 24/7, and dispatch to Gateway is handled by our local crews. We carry the Barrett & Sons name on every truck, every uniform, every invoice. Step one is always the same: Tom publishes his name and license number so you can verify everything before you sign anything.
Our Home Additions & ADU Services in Gateway
Our Home Additions & ADU team handles every scope, from a small interior conversion to a fully permitted detached unit. Here’s what we see most in Gateway.
ADU Design & Permitting
Building an ADU in Gateway isn’t like building in an unincorporated patch of Lee County. The design has to work within your community’s architectural guidelines, and it has to clear Lee County’s building department. We prepare the drawings, file the paperwork, and track both approvals. In a straight line, expect the process to take weeks longer here than in a nearby area without HOA review. The HOA approval letter gets pulled before the county permit, every single time.
Garage Conversion ADU
A garage conversion in Gateway runs $30,000 to $80,000, and it’s a practical way to add a rental unit or in-law suite without changing the home’s footprint. Concrete block garages hold up well, but we always check roof-to-wall connections and hurricane strapping before opening any walls. The conversion itself is straightforward; the paperwork, less so, since you’ll need both the county and your community’s review committee to accept the change of use. We handle all of it.
New Detached ADU
A detached ADU in Gateway will typically run $90,000 to $220,000, and it’s the cleanest way to add a separate living unit on your lot. The flat, low-lying terrain here means we pay extra attention to slab elevation and drainage. A lot of Gateway lots sit high enough to be fine, but we test. Soil compaction testing before a pour is standard for us on any detached structure, not an upgrade.
Junior ADU & Interior Conversion
For homeowners who don’t have the lot space for a detached unit, a junior ADU or interior conversion can add a kitchenette, bath, and private entrance within the existing footprint. These projects often start around $45,000 and climb with finish level. The key in Gateway is making sure the conversion doesn’t trip any community restriction on exterior modifications, even if the change is technically interior.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Gateway
For windows on a new addition or a converted ADU in Gateway, we install Simonton, PGT, and CGI impact-rated lines, which matters because Lee County building code treats impact protection as a requirement for any new living space. We order directly, inspect every unit before the crew brings it out, and keep lead times short so the county inspection schedule doesn’t slip because a window didn’t arrive. When your addition includes a roofline or exterior tie-in, Andersen doors and windows and GAF roofing materials are standard on our jobs, not line items you have to ask about.
If your addition flows into a kitchen or bath update, we can coordinate that work too. We also handle Kitchen Remodeling in Gateway and Bathroom Remodeling in Gateway, so one crew can carry the entire project from foundation to finishes.
Common Home Additions & ADU Problems We See in Gateway Homes
- HOA rejection after construction starts. A homeowner hires someone who files the county permit and starts work, then the Architectural Review Committee flags the roofline or driveway finish. The work has to stop, and the change order arrives. We pull the HOA approval before the county permit, which saves weeks and money.
- Saturated soil delaying foundation pours. Gateway’s water table rises during the May through October wet season, and flat lots hold standing water. We schedule site prep and slab pours around the drainage pattern on the specific lot, not a generic construction calendar.
- Roof-to-wall connector failures on older CBS homes. Many homes built in the 1995 to 2012 boom predate the stricter post-Ian code updates. Opening a wall for an addition often means upgrading those connectors to current code, and the county will require it. We plan for it in the written estimate rather than discovering it mid-job.
- Impact glazing gaps on converted living spaces. When a garage or interior space becomes living area, the county requires impact-rated windows and doors. We include that as a line item in the initial quote, not a surprise allowance.
Pricing for Home Additions & ADU in Gateway, FL
Here’s what we tell Gateway homeowners on the first call. A room addition runs $45,000 to $130,000. A garage conversion ADU runs $30,000 to $80,000. A new detached ADU runs $90,000 to $220,000. A junior ADU or interior conversion usually starts around $45,000 and rises with finish level and whether you’re adding a full bath and kitchenette.
What moves those numbers? Site drainage work, whether your roofline ties into the existing structure cleanly, impact window and door requirements, and how much of the existing block wall has to be opened or reinforced. You’ll get a written line-item estimate before work starts, every allowance on paper, and a written change order before any scope change is approved. If the number moves, it moves in writing first. Call (877) 610-1318 for a free estimate.
We Also Serve Cities Near Gateway
Our crews work throughout eastern Lee County. Beyond Gateway, we serve Lehigh Acres to the east, Fort Myers Shores to the north, and the Fort Myers and Villas areas for homeowners who want the same written-scope, permit-first process. If you’re not sure whether we cover your street, call and ask.
Serving Gateway, FL - Our Local Coverage Area
We’re based in the Gateway 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 Gateway
We can typically schedule a site visit in Gateway within a few days of your call, and our written estimate follows shortly after. Permit and HOA approval timelines drive the start date more than our crew schedule, and we’ll map out a realistic timeline for your community during the estimate. Call (877) 610-1318 to start.
Yes, we work throughout the 33973 ZIP code and all of Gateway’s communities, including neighborhoods off Daniels Parkway and SR 82. If you’re inside Gateway’s CDP boundaries, we cover it.
The HOA review doesn’t add a direct cost, but it can add scheduling time and may restrict specific materials, which can affect pricing. A detached ADU in Gateway runs $90,000 to $220,000, and we’ll flag any HOA-driven material requirements in writing before you commit. Call (877) 610-1318 for a precise quote.
We pull Lee County permits and your community’s HOA approval letter before work begins, and we schedule and pass every required inspection. The permit inspector works for you, not for us. That’s the point of pulling permits on every eligible job.
Yes. Every completed job is backed by our 90-Day Done Right Promise: if it’s not done right, Tom comes back and makes it right, one call. That’s written on every contract. We also honor the $40 Off Any Repair Over $200, free second opinions on written estimates, no trip charge inside Lee County, and a permanent 10% Senior & Veteran discount.
Call (877) 610-1318 today to schedule your free estimate for any Home Additions & ADU project in Gateway.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Gateway since 1998.