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 Isle of Normandy
If you live on Isle of Normandy, you’ve probably figured out by now that adding square footage here isn’t like adding it on the mainland. A home addition or ADU in Isle of Normandy typically runs $45,000 to $130,000, and the bigger cost drivers aren’t the materials you can see. They’re the water table sitting 18 to 24 inches below your slab, the salt air eating at 1950s rebar, and the fact that your hollow-core block walls need grout-filled cores before any hurricane strap can legally do its job. We know because we’ve opened up enough of these mid-century CBS homes to know what’s behind the stucco before the first hammer swings.
Barrett & Sons Construction has been handling Home Additions & ADU work across Isle of Normandy for years. Tom Barrett and his sons run the crews themselves, not a rotating cast of subcontracted strangers. Call (877) 610-1318 and a live person answers, day or night. That matters when you’re trying to figure out whether the quote you got from another company priced in the grout work or conveniently left it out.
Why Barrett & Sons Construction Is Isle of Normandy’s Preferred Home Additions & ADU Company
We didn’t get here by running ads. We got here by doing work on Normandy Drive, on Trouville Esplanade, over near the Normandy Shores Golf Club, and having neighbors walk past, see a job site that’s tidy and a crew that shows up when they said they would, and ask for a card. That’s how business gets done on a man-made island in Biscayne Bay, and it’s how Tom has built this company since 1998.
Every job we sign in Isle of Normandy carries something most contractors won’t put in writing: the 90-Day Done Right Promise. If something isn’t right after we finish, Tom comes back. One call. That promise is written on the contract, not implied in a handshake. And to be clear, Tom publishes his name, his address, and his license number. Look it up before you sign anything. We’d rather you know who you’re hiring than take our word for it.
Calls to us from Isle of Normandy don’t route to an out-of-state call center. They route to a live person who knows the island, knows the zip code 33141, and can start answering real questions about your project before you’ve even hung up. No trip charge inside the county, and a free second opinion on any written estimate you’ve already collected. Bring us the other guy’s number. We’ll tell you if it’s honest.
Our Home Additions & ADU Services in Isle of Normandy
ADU Design & Permitting
An ADU on Isle of Normandy isn’t a shed with a mini-split. It’s a permitted, engineered structure that has to meet Miami-Dade’s High-Velocity Hurricane Zone code while sitting on a barrier island where the water table greets you before you’ve dug two feet. We handle the design, the structural drawings, the permit package, and the inspections. The permit inspector works for you, not for me, which is exactly why we like him. Every ADU we design in Isle of Normandy gets engineered roof attachments and impact-rated openings on day one, because there’s no shortcut around HVHZ that’s worth your family’s safety.
Garage Conversion ADU
Plenty of Isle of Normandy homes have those 1950s carports or enclosed garages that stopped fitting modern cars decades ago. Converting one into a rental unit or an in-law suite is often the smartest dollar-per-square-foot move on the island. A garage conversion in Isle of Normandy typically runs $30,000 to $80,000, depending on whether we’re working with an existing slab or tearing one out. But before we put up drywall, we check what’s underneath. The salt air has been working on those anchor bolts since Eisenhower was in office, and unaddressed corrosion there becomes a structural problem later.
New Detached ADU
Building a new detached ADU in Isle of Normandy means we’re pouring footers into ground that’s wet before we finish the hole. That’s not a complaint. It’s a fact of building on a man-made island that sits barely above sea level, and it changes how we spec the foundation, the waterproofing, and the drainage. A new detached ADU here typically runs $90,000 to $220,000. That range accounts for what we find when we start digging, and what we find is rarely a surprise to us. We’ve been doing this long enough to know what Biscayne Bay gives us to work with. Every scope, every allowance, every price change arrives as a written change order before work happens. The allowance that isn’t on paper is a surprise waiting for a date.
Junior ADU & Interior Conversion
Not every Isle of Normandy homeowner wants a full second structure. Sometimes the smartest play is converting an existing interior space, a den, a formal dining room nobody uses, into a junior ADU with its own entrance and a small kitchenette. These conversions often move faster because we’re working inside the existing envelope, not fighting the water table for new footers. But the cost discipline doesn’t change: written change orders, permits pulled, inspections signed. And because we’re already inside your walls, this is where homeowners often ask us to look at Kitchen Remodeling in Isle of Normandy or a Bathroom Remodeling in Isle of Normandy while we’re in there. We’re glad to quote both, separately and in writing.
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 Isle of Normandy
We don’t show up with mystery materials off a van. On Isle of Normandy projects, we’re installing brands you can look up: Techo-Bloc and Cambridge pavers for site work and drainage paths, Quikrete products for the core-filling and structural repairs those 1950s block walls need before we attach anything to them. We stock the fasteners, the grout, and the waterproofing products that this island’s site conditions actually require, which means less waiting on a parts run and fewer delays on a project that’s already fighting a calendar.
Common Home Additions & ADU Problems We See in Isle of Normandy Homes
- Hollow-core block walls that fail retrofits. When we open up a 1950s CBS wall in Isle of Normandy and find unfilled hollow-core block, we can’t just bolt hurricane straps to it and call it done. The code requires core-filling those cavities with grout before any new connection can reach its load rating. Skip that step, and the inspection fails. Do it right, and you’ve added cost the mainland quote never mentioned.
- Groundwater in the footers. Dig down 18 to 24 inches on Isle of Normandy and you’re likely standing in water. That changes the pour, the curing, the waterproofing, and the schedule. Any contractor who prices a foundation here without accounting for that is guessing, and guessing is expensive.
- Concrete spalling from salt air. The stucco looks fine from the street, but the rebar inside has been carbonating for 60 years in salt-laden air off Biscayne Bay. Before we tie a new addition into an existing slab or wall, we remediate the spalling. Otherwise, the new work is only as strong as the failing stuff we attached it to.
- Drainage patterns that don’t work anymore. Miami Beach’s road-raising program has shifted street grades around Isle of Normandy, and plenty of these mid-century homes now sit at or below the new street elevation. Water that used to run toward the street now pools against your foundation. A good addition here starts with fixing the way water moves across your lot.
Pricing for Home Additions & ADU in Isle of Normandy, FL
Let’s talk real numbers. A home addition in Isle of Normandy typically runs $45,000 to $130,000. An ADU, whether attached, detached, or a garage conversion, typically runs $90,000 to $220,000 for new construction and $30,000 to $80,000 for a garage conversion. What moves the number? Foundation work for one, because the water table here is unforgiving. Structural remediation for another, because those 1950s block walls rarely meet today’s connection standards as-is. Impact-rated windows and doors, because HVHZ code requires them and they’re not optional. Every quote we give is line-itemed, every allowance is in writing, and every change order lands on paper before it lands on your invoice. Call (877) 610-1318 for a free estimate, and if you already have a written estimate from someone else, bring it. We’ll give you a free second opinion, no strings attached.
We Also Serve Cities Near Isle of Normandy
If you’re in North Bay Village, Miami Shores, Bay Harbor Islands, or Surfside and you’re weighing a home addition or ADU, the same crew that handles Home Additions & ADU in Isle of Normandy handles yours. The water table and the HVHZ code don’t respect city lines, and neither does our warranty. We serve the whole stretch of Biscayne Bay communities without changing how we write a contract or how we answer a phone.
Serving Isle of Normandy, FL - Our Local Coverage Area
We’re based in the Isle of Normandy 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 Isle of Normandy
We have crews working in Isle of Normandy regularly, and scheduling is handled from our South Florida office, so there’s no long wait to get someone out to walk your property, check your slab, and talk about what you’re planning. Call (877) 610-1318 and we’ll get a time on the calendar that works for you, with no trip charge inside the county. Estimates are always free.
Yes. Our crews work across the entire island, from the streets around Normandy Shores Golf Club to the bayfront lots where salt exposure is at its worst. The conditions change slightly depending on how close you are to the water, and we account for that in how we spec fasteners, waterproofing, and exterior finishes. No part of Isle of Normandy is out of our range.
We can, and we do. If you have an approved permit set and you’re looking for a contractor who will actually build to it, we’ll review what you have, walk the site, and give you a line-itemed quote. If we spot a detail that won’t pass inspection on this island, we’ll tell you before we sign anything. Our name goes on the job, and Tom doesn’t put his name on work he can’t stand behind.
Not dramatically, but there are Isle of Normandy-specific costs that can add up. The high water table, the hollow-core block remediation, and the salt-air corrosion on existing structural connectors all show up here more than they do on mainland sites. That doesn’t mean you’re overpaying. It means you’re paying for the work the house actually needs. We’d rather price it honestly up front than surprise you at the end.
Every project we complete in Isle of Normandy carries the 90-Day Done Right Promise, written on the contract. If something isn’t done right, Tom comes back and makes it right, one call. No chasing a national call center. No arguing about who’s responsible. You call, we come back. That’s the whole promise.
Planning a home addition or ADU on Isle of Normandy isn’t a small decision, and we don’t treat it like one. You deserve a line-itemed quote, a written change order for every scope shift, permits pulled and inspections signed, and a contractor who answers his own phone. Call (877) 610-1318 today to schedule your free estimate. We’ll walk the property, talk through the real numbers, and you can decide if we’re the right fit. No pressure, no games.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Isle of Normandy since 1998.