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 Bonita Springs
Home additions and ADU construction in Bonita Springs typically run between $45,000 and $130,000 for a full addition, while a detached ADU starts around $90,000 and can reach $220,000 depending on elevation requirements and finish level. The single biggest variable in this city is flood-zone compliance: much of Bonita Springs sits in FEMA AE and VE zones, which can add $20,000 to $60,000 to a project for raised stem walls, breakaway panels, and flood-resistant materials. We’ve worked these streets long enough to know exactly where those costs land before we ever hand you a number. Call (877) 610-1318 for a free estimate on your addition or ADU, and we’ll walk the property with you so the quote reflects what your lot actually requires.
If you lost part of your home to Hurricane Ian’s storm surge along the Imperial River corridor, you already know the permitting landscape changed. We’ll get into that below. But first: this is work Tom Barrett and his sons do themselves, with permits pulled and inspections signed on every eligible job, and every scope change in writing before it costs you a nickel more.
Why Barrett & Sons Construction Is Bonita Springs’s Preferred Home Additions & ADU Company
Tom Barrett has been putting his name on construction work since 1998, and that name is published along with his address and license number. You can look it up before you sign anything, and the same faces you meet at the estimate are the ones swinging hammers on your job. That matters a great deal in a place like Bonita Springs, where post-Ian work has drawn plenty of out-of-town contractors who quote low and disappear when the Lee County permitting queue gets slow. We live twenty minutes away. If something’s not right, we want to know about it, because we’ll see you at the hardware store.
Crew members carry the Barrett & Sons name and go through background checks before they ever step onto a Bonita Springs property. Every contract includes the 90-Day Done Right Promise in writing: if it’s not done right, one call brings Tom back. We also answer the phone with a live person 24 hours a day, seven days a week. Not a voicemail box, not an out-of-state call center. When you’re staring at a FEMA substantial damage letter and trying to figure out whether to repair or rebuild, that matters.
We coordinate scheduling and dispatch from our Miami (South FL) office, with local crews serving Bonita Springs directly. What we don’t do is hand your project to a franchise team that’s never worked a canal-front lot in 34134.
Our Home Additions & ADU Services in Bonita Springs
The Home Additions & ADU work we do in Bonita Springs spans four main types, each with its own permitting and elevation considerations. Here’s what that looks like on the ground.
ADU Design & Permitting
An accessory dwelling unit in Bonita Springs is not a shed with drywall. Depending on your lot’s flood zone and the year your primary structure was built, Lee County may require finished-floor elevation certificates, breakaway wall engineering, and a full set of flood-resistant material specs before a permit moves. We handle the design, the elevations, and the county submittal as one package. In the 34135 ZIP particularly, we’re seeing Ian-damaged properties flagged as exceeding the 50% substantial-damage threshold, which means the ADU has to meet current Florida Building Code wind and flood provisions, even if it’s technically an accessory to a pre-2002 house.
Garage Conversion ADU
Converting an attached garage into an ADU is often the most budget-friendly path in Bonita Springs, running roughly $30,000 to $80,000. The catch here is flood compliance: if your garage slab sits below the base flood elevation, the conversion may require raising the living space, adding flood vents, or switching to flood-resistant finishes throughout. Homes in Bonita Bay and Pelican Landing built in the transitional mid-1990s to 2000s era often have slab elevations that work, but older inland homes in the pre-Andrew ranch stock usually need a closer look.
New Detached ADU
A new detached ADU in Bonita Springs starts around $90,000 and commonly reaches $220,000 for a full one-bedroom unit with a kitchen and bath. Elevated stem-wall or piling construction, which FEMA AE and VE zones require for any new build, is the biggest cost driver beyond square footage. We pull permits and meet the inspector on every one of these. The permit inspector works for you, not for me, and that’s exactly why I want him on the job.
Junior ADU & Interior Conversion
For homeowners who don’t need a separate kitchen, a junior ADU carved out of an existing bedroom or bonus room can add rental income or family space without a full foundation. These conversions in Bonita Springs often trigger substantial improvement reviews if the home has unresolved Ian damage, which is why we start any interior conversion with a honest look at what Lee County’s assessor will require, not just what the homeowner wants built. If you’re also looking at Kitchen Remodeling in Bonita Springs or Bathroom Remodeling in Bonita Springs as part of an addition, we can sequence the work so you’re not living in a construction zone twice. And we also handle ADU Site Prep & Utilities, Room Additions, Second Story Additions, and Sunrooms & Enclosed Patios for homeowners across Bonita Springs.
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 Bonita Springs
When we build additions and ADUs in Bonita Springs, we install materials you can look up by name. For impact-rated windows and doors, we work with PGT, Simonton, and CGI products, all built for the wind loads and missile-impact testing Florida’s coastal codes demand. Ply Gem trim and cladding shows up on a lot of our enclosed patio and sunroom conversions. These aren’t mystery brands off a van, and if you want to check specs before signing, we’ll give you the product numbers.
Common Home Additions & ADU Problems We See in Bonita Springs Homes
- Post-Ian permitting limbo: Homes along the Imperial River and its canal spurs that took storm surge in 2022 are frequently sitting in Lee County’s substantial improvement review queue. Owners who planned a simple garage conversion or room addition are being told the entire structure must meet current flood elevation codes, which can double a project’s budget overnight.
- Old tie-downs and single-pane windows: The 1970s through early-1990s ranch homes in older inland Bonita Springs neighborhoods were built before Andrew changed the code. When we add square footage to these, the existing structure often needs hurricane strapping and impact window retrofits just to pass inspection on the new work.
- Canal-lot elevation surprises: Many of the residential canals in 34134 and 34136 sit at unusually low elevations relative to the bay. What looks like a flat, buildable backyard can turn out to be a VE zone requiring breakaway walls and piling-supported additions, which changes the foundation design before framing even starts.
- Contractors skipping the substantial damage conversation: We’ve walked onto more than a few Bonita Springs properties where a previous contractor quoted a room addition without mentioning that the home had Ian damage on file. If the assessor flags it later, the owner is mid-project and facing a stop-work order. We check that before we quote, because a surprise that size should never wait for a date.
Pricing for Home Additions & ADU in Bonita Springs, FL
Here are the realistic ranges we’re seeing in Bonita Springs right now:
- Home addition: $45,000-$130,000
- ADU construction: $90,000-$220,000
- Garage conversion: $30,000-$80,000
- Junior ADU or interior conversion: $25,000-$70,000
- Sunroom or enclosed patio: $20,000-$55,000
- Second story addition: $80,000-$180,000
What separates a $130,000 home addition in Bonita Springs from a $45,000 one usually comes down to flood zone, elevation work, and whether the existing structure needs hardening to meet current wind codes. A canal-front lot in 34134 with a VE designation will cost more than an inland lot in 34135 at the same square footage. We put every allowance, every scope item, and every price change in writing before work proceeds. That’s not a sales line, it’s just how we avoid the “different bill at the door” problem that’s burned so many Bonita Springs homeowners. Call (877) 610-1318 for a free estimate. We also offer a Free Second Opinion on any written estimate you’ve already received, and No Trip Charge inside the county.
We Also Serve Cities Near Bonita Springs
Our crews work across Bonita Springs and the surrounding communities, including Estero, Naples Park, Pelican Bay, and San Carlos Park. If you’re just outside the city line, we can still help with your Home Additions & ADU project, and we’ll be honest about permitting jurisdiction before you commit. A live person answers the phone at (877) 610-1318 no matter which of these areas you’re calling from.
Serving Bonita Springs, FL - Our Local Coverage Area
We’re based in the Bonita Springs 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 Bonita Springs
Our lead time for a new Bonita Springs addition or ADU typically runs 2 to 4 weeks from signed contract to first permit submittal, but the actual construction start depends on Lee County’s current permit queue, which has been running slower than normal in the post-Ian workload. We’ll give you an honest timeline at the estimate, not a promise we can’t keep. Call (877) 610-1318 and we’ll look at your lot first.
Yes, we cover 34133, 34134, 34135, and 34136, including canal-front properties in 34134 and 34136 and the older inland ranch neighborhoods in 34135. If you’re on a canal or river lot, tell us early in the call so we can check flood-zone requirements before the walk-through. Estimates are free.
Only if the scope changes, and only after you’ve received and signed a written change order. That’s our policy on every Bonita Springs job. An allowance that isn’t on paper is a surprise waiting for a date, and we don’t do surprises. If an inspector requires something beyond the original scope, you’ll see the price on paper before a single nail moves.
A home addition in Bonita Springs generally lands in the $45,000 to $130,000 range, which is slightly more affordable than Naples at the same square footage, but the flood-zone variables here can swing a project fast. The big differentiator isn’t city-to-city, it’s lot-to-lot: elevation, Ian damage history, and the age of your existing structure. That’s why we quote on-site, never over the phone.
Every job carries our written 90-Day Done Right Promise. If something isn’t right after we finish, one call brings Tom Barrett back to make it right. We don’t consider a project closed until you’ve had time to live in the space and tell us what’s not working. Call (877) 610-1318 to schedule your free estimate, and ask for Tom.
Get a Straight Answer on Your Bonita Springs Addition or ADU
If you’ve got Ian damage, a flood-zone lot, or just a growing family and no idea what the county will let you build, start with a free estimate from someone who answers his own phone. Tom Barrett and his sons have been running Barrett & Sons Construction since 1998, with permits pulled, inspections signed, and change orders in writing on every eligible job. Look up the license number yourself. Then call (877) 610-1318 and get a quote you can actually build on.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Bonita Springs.