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 Cape Coral
Home additions and ADU construction in Cape Coral typically run between $45,000 and $130,000 depending on scope, site conditions, and whether you’re adding up or building out. A detached ADU on a standard lot sits higher, while an interior conversion comes in lower. We’ve been building in this city long enough to know that the real number on a Cape Coral job often hinges on one thing most contractors never mention: whether your lot touches the water. Call (877) 610-1318 for a free estimate, and we’ll walk the site with you before anyone writes a number down.
Why Barrett & Sons Construction Is Cape Coral’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and his sons run the crews today. When you call about an addition or ADU in Cape Coral, you’re talking to the family that shows up with the tools. Not a call center, not a franchise dispatcher. We publish Tom’s name, address, and license number on every estimate because the last thing a Cape Coral homeowner needs is another contractor who disappears after the deposit clears.
We answer our own phone, 24 hours a day. If something goes sideways on a second-story addition in 33914 at 9 p.m., you get a live person. And every job carries our 90-Day Done Right Promise in writing: if it’s not done right, Tom comes back and makes it right, one call. That’s how we’ve built our reputation across Cape Coral, and it’s why our customers don’t hesitate to put our name out to their neighbors.
Our crew members are background-checked and uniformed. The permit inspector works for you, not for us, and that’s exactly how Tom likes it. We pull permits on every eligible job and we get the inspections signed. An allowance that isn’t on paper is a surprise waiting for a date, so every scope, every allowance, every price change arrives as a written change order before work happens. No surprise invoices at the end.
Our Home Additions & ADU Services in Cape Coral
ADU Design & Permitting
This is where Cape Coral separates the builders who know the city from the ones who just showed up. Any addition or ADU on one of the city’s 400+ miles of navigable canals triggers a mandatory seawall condition inspection and possible repair permit before the building department will accept plans. That’s a gate Fort Myers and Lehigh Acres simply don’t have. Our Home Additions & ADU team handles the full design package, the seawall check, FEMA elevation review, and the permit submittal as one coordinated process, so you’re not stuck calling six different offices.
New Detached ADU
A detached ADU in Cape Coral runs $90,000 to $220,000, and the spread depends heavily on whether you’re on a dry lot in 33909 or a canal-front parcel in 33914. On a canal-front lot in the 33914 zip, our crew tied a new 480 sq ft detached ADU into a 1970s CBS home and had to replace 45 feet of failing 50-year-old seawall before the city would issue the building permit. We specified hot-dipped galvanized anchor bolts and stainless connectors throughout the rough-in because the brackish canal air eats standard hardware in under a decade. That’s the kind of call that only matters here.
Garage Conversion ADU
Converting an attached garage in Cape Coral runs $30,000 to $80,000, and it’s often the smartest move on lots where the setback rules leave no room to build out. The catch in many of the city’s HOA communities, including Sandoval and the newer developments in 33993, is that the association has its own architectural review before the city even looks at your plans. We’ve navigated enough of those boards to know what they’ll approve, what they’ll kick back, and how to present the plan the first time so you’re not paying for redraws.
Junior ADU & Interior Conversion
For homeowners who need an in-law suite or a rental unit without adding a separate structure, a junior ADU inside the existing footprint often makes the most sense. These conversions sit at the lower end of the pricing range, and in Cape Coral’s older CBS homes from the 1960s to 1980s, the concrete block walls actually work in your favor: they carry load well, and cutting interior openings is often simpler than in wood-frame construction. We still pull the permit and get the inspection signed, because unpermitted interior work is the fastest way to void a builder warranty on a newer home and tank your resale value on an older one.
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 Cape Coral
We don’t put mystery materials into your addition or ADU. When your project calls for pavers around the new unit’s entry or a patio tied into the existing hardscape, we specify Techo-Bloc and Cambridge Pavers, names you can look up and verify before anything gets installed. For structural concrete work, we use Quikrete products. If you’re adding a driveway approach or redoing the walkway to the new ADU entrance, we’ll write the exact product into your scope of work. You’ll know what’s going in before the first bag gets opened.
Common Home Additions & ADU Problems We See in Cape Coral Homes
- Ignoring the seawall inspection gate. Canal-front owners in 33904 and 33914 start framing an addition only to find the city won’t issue a permit until the seawall is repaired. That adds weeks and $15,000 to $40,000 to a job that should have been flagged on day one.
- Under-specifying hurricane hardware. A builder from inland Florida uses standard anchor bolts on a second-story addition, and the inspector fails the load-bearing connection at 150+ mph wind design. Cape Coral enforces high-velocity hurricane zone standards aggressively, and insurance carriers do too.
- Voiding the builder warranty on a newer 33993 home. The owner lets an unlicensed handyman cut a new door opening in a load-bearing wall, and the warranty repair for shifting drywall is denied because the alteration wasn’t permitted. A $3,000 shortcut becomes a $12,000 structural repair, and the warranty is gone.
- Misjudging flood-zone elevation. After Hurricane Ian, FEMA elevation requirements have changed what builders can do on lower-lying lots in 33915 and 33910. Plan for the elevation review before you plan the room, or you’ll be redesigning after the first submittal rejection.
Pricing for Home Additions & ADU in Cape Coral, FL
Here’s what we’re quoting across Cape Coral right now, and these numbers hold until the scope changes. A new detached ADU runs $90,000 to $220,000. A garage conversion ADU runs $30,000 to $80,000. A second-story addition on an existing CBS home runs $45,000 to $130,000. What moves the number? Seawall repairs on canal-front lots, flood-zone elevation requirements, HOA finish standards, and the cost of stainless or hot-dipped galvanized hardware that Gulf salt air demands. Every price change arrives as a written change order before work proceeds. Call (877) 610-1318 to schedule your free estimate.
| Project Type | Typical Cape Coral Price |
|---|---|
| New Detached ADU | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
| Second Story Addition | $45,000-$130,000 |
We Also Serve Cities Near Cape Coral
Our Cape Coral crews also cover the surrounding communities of Iona, Cypress Lake, McGregor, and Villas. If you’re close to the Cape but not inside city limits, call us anyway. We’ll tell you honestly whether we’re the right fit for your job, and the estimate is free either way.
Serving Cape Coral, FL - Our Local Coverage Area
We’re based in the Cape Coral 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 Cape Coral
Yes, on any canal-front lot in Cape Coral, the city requires a seawall condition inspection before it will accept plans for an addition or new structure. If the seawall is failing, you’ll need a repair permit before the building permit can be issued. That step typically adds $15,000 to $40,000 and several weeks to the project timeline, so we flag it during the initial site walk, not after framing starts. Call (877) 610-1318 and we’ll check your seawall status as part of the free estimate.
Yes, in most cases, but the HOA’s architectural review comes first, before the city permit process begins. Sandoval and many of the newer 33993 communities have specific rules about exterior appearance, driveway preservation, and whether a garage conversion can eliminate covered parking. We prepare the submittal package to match exactly what those boards look for, so you don’t lose weeks to rejection letters. Call (877) 610-1318 for a free estimate on your conversion.
You need a structure designed to the Florida Building Code’s high-velocity hurricane zone requirements, which in Cape Coral means 150+ mph design wind speeds. That’s not a suggestion, it’s what the city inspector will enforce on load-bearing connections, anchor bolts, and roof-to-wall ties. We specify stainless or hot-dipped galvanized connectors throughout because the Gulf salt air corrodes standard hardware within a decade. Call (877) 610-1318 and we’ll walk you through what your specific addition needs before you commit to anything.
Pull a permit for the work and use a licensed contractor who can document every alteration. If an unlicensed handyman cuts into a load-bearing wall in a newer 33993 home and the drywall shifts later, the builder will deny the warranty claim because the alteration wasn’t permitted. We handle the permit, the structural engineering, and the inspection sign-off so your original builder’s warranty stays intact. Call (877) 610-1318 for a free second opinion on any written estimate you’ve already received.
You can expect staged payments tied to completed milestones: a deposit at contract signing, a draw after permit issuance, a draw after foundation and rough-in pass inspection, a draw after dry-in, and a final draw at completion and final inspection. Every draw and every allowance is written into the contract before work starts. Any change to that schedule arrives as a written change order, so you’re never funding work that hasn’t happened. Call (877) 610-1318 and we’ll put the full schedule on paper for your specific project.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Cape Coral, FL and surrounding communities.