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 North Miami Beach
Adding square footage to a North Miami Beach home means navigating the toughest building code in the country. A full home addition in North Miami Beach typically runs $53,100-$153,400, while a detached ADU starts around $106,200 and can reach $259,600 depending on site conditions. Those numbers include something most contractors won’t tell you about up front: every window, door, and roof product must carry a Miami-Dade Notice of Acceptance (NOA) number, not just Florida state approval. If you’re planning a room addition, second story, garage conversion, or new ADU in the 33160 ZIP code, call Barrett & Sons Construction at (877) 610-1318. We’ll walk your property, check your scope against current HVHZ requirements, and put every allowance in writing before the first permit gets pulled.
We’ve worked the residential streets off NE 163rd Street, the condo-lined corridors near the Intracoastal, and the older CBS blocks where 1950s and 60s homes are getting second lives. North Miami Beach isn’t a market where you guess at code and hope the inspector’s in a good mood. It’s a place where dual-layer permitting, a 2-4 foot water table, and salt-air corrosion all collide on the same job site. That’s why our Home Additions & ADU process starts with a site walk and a written scope, not a handshake and a hope.
Why Barrett & Sons Construction Is North Miami Beach’s Preferred Home Additions & ADU Company
Tom Barrett puts his name, his address, and his license number on every contract we write in North Miami Beach. Look it up before you sign anything. That’s not a sales pitch; it’s how we’ve operated since 1998. The permit inspector works for you, not for me, and when both the City of North Miami Beach and Miami-Dade County Building and Neighborhood Compliance are reviewing your addition, you want a contractor who treats that dual-layer process as normal business, not an inconvenience.
North Miami Beach homeowners call us because we answer the phone. A live person picks up 24/7, not a voicemail box or an out-of-state call center. When you’re mid-renovation and a stop-work order appears because a subcontractor swapped in windows without the right NOA number, you need to reach someone who knows exactly what happened and how to fix it. Our crew members are background-checked and carry the Barrett & Sons name. Tom’s sons run the crews. The people who show up are the same people you’ll see at the hardware store on Saturday, and that matters in a city this tight-knit.
We also carry a 90-Day Done Right Promise on every construction and remodeling job. It’s written on the contract, not buried in fine print. If something’s not right, one call brings Tom back. For homeowners in North Miami Beach who’ve been burned by a national outfit quoting one number on the phone and delivering another at the door, that promise is the difference between a contractor and a name you can trust.
Our Home Additions & ADU Services in North Miami Beach
ADU Design & Permitting
An ADU in North Miami Beach lives or dies at the permit counter. Every product you spec must carry a Miami-Dade NOA number, and both city and county inspectors review the submittal. We handle the full design and permitting package: drawings, structural calcs, NOA product schedules, and the dual-agency coordination that eats weeks off the schedule when done right. A typical ADU Construction project in North Miami Beach runs $106,200-$259,600, and that range starts with a permit package that won’t get kicked back. We submit what the county actually asks for, the first time.
Garage Conversion ADU
Converting an attached garage in North Miami Beach usually costs $35,400-$94,400. The older CBS homes off NE 163rd Street and toward Ojus often have flat or low-slope roofs and original slab-on-grade floors that sit close to the water table. Before we frame a single wall, we check what’s actually there: anchor bolts, roof ties, electrical service size, and whether the slab can handle a living space without engineered footings. If your garage was built in the 1960s, it probably can’t, and we’d rather tell you that in a written scope than discover it after demo day.
New Detached ADU
A new detached ADU in the 33160 ZIP forces you to confront the ground itself. North Miami Beach sits low and coastal, and the water table often sits just 2-4 feet below grade. That means engineered pilings or deep footings on nearly every new structure, and it means a geotechnical survey before anyone digs. Budget $106,200-$259,600 depending on size, finishes, and site access. The salt air from both the Atlantic and the Intracoastal also means we spec marine-grade anchors and fasteners as standard, not as an upgrade. Skip that and you’ll be replacing corroded connections before the paint dries.
Junior ADU & Interior Conversion
Sometimes the smartest addition in North Miami Beach is already inside your footprint. A junior ADU carved from an existing bedroom wing, a utility room, or an oversized laundry space can create a rentable unit or an in-law suite without adding foundation work in challenging soil. These projects still trigger code review, including egress requirements and electrical load checks, and any window you touch must meet HVHZ standards. We scope interior conversions with the same written change-order process we use on full additions: every allowance on paper before we open the first wall.
We also handle room additions ($53,100-$153,400), second story additions ($53,100-$153,400), and sunrooms and enclosed patios that turn North Miami Beach’s year-round warmth into usable square footage. Each one starts the same way: a site walk, an honest read on what your existing structure can carry, and a written scope that accounts for HVHZ reality.
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 North Miami Beach
When you’re building an addition or ADU in salt-air country, what you install matters as much as how you install it. We carry premium brands our crews know well, including Techo-Bloc and Cambridge Pavers for hardscape and paver work that holds up to coastal conditions, and Oldcastle products when the job calls for proven structural materials. We don’t stock mystery brands off a van. Every product schedule we submit to the City of North Miami Beach and Miami-Dade County lists materials with verifiable NOA numbers where required, so the inspector can look up exactly what you’re getting before sign-off. That’s how we keep jobs moving in a code environment that punishes substitution.
Common Home Additions & ADU Problems We See in North Miami Beach Homes
Every older home in North Miami Beach has a story. Here’s what we actually find when walls come open:
- Original single-pane jalousie windows on 1960s CBS homes. These hit the market when Miami-Dade building codes were nothing like today’s HVHZ standards. Add a new room and the city will make you bring the entire structure’s window envelope to current code, so we write that allowance into the contract before the first permit gets pulled.
- Corroded anchor bolts and metal fasteners from dual salt-air exposure. North Miami Beach sits between the Atlantic and the Intracoastal, and that brackish air attacks steel faster than inland Miami locations. On addition jobs, we inspect existing connections and replace anything that looks like it’s spent decades near saltwater.
- Slab-on-grade footings sitting just three feet above the water table. In the low-lying areas near Ojus and the Intracoastal corridor, original 1950s slabs were poured when nobody thought much about hydrostatic pressure. Before we add a second story or a heavy addition, we check what’s under the existing footprint and write an allowance for engineered pilings if the survey demands it.
- DIY or unpermitted ADU conversions that never got inspected. We regularly open walls and find original roof ties that were never signed off, electrical work that doesn’t meet current load requirements, and windows that pass Florida state code but lack the Miami-Dade NOA number this county enforces. Fixing someone else’s shortcut is always more expensive than doing it right the first time, and we show you exactly what it costs in writing.
Pricing for Home Additions & ADU in North Miami Beach, FL
Here’s the honest picture on North Miami Beach pricing. You’ll pay more here than in Broward County, and the reason is code. Not labor gouging, not “market adjustment.” The Miami-Dade HVHZ requires NOA-approved products for windows, doors, and roofing, and those products cost more than Florida-statewide-approved equivalents. A dual-layer permit review adds coordination time. A 2-4 foot water table adds foundation engineering. None of that should surprise you at the end of a job.
| Project Type | Typical Range in North Miami Beach |
|---|---|
| Home Addition | $53,100-$153,400 |
| ADU Construction | $106,200-$259,600 |
| Garage Conversion | $35,400-$94,400 |
| Second Story Addition | $53,100-$153,400 |
| ADU Site Prep & Utilities | $5,310-$14,160 |
| Impact Window Installation | $9,440-$29,500 |
What moves a North Miami Beach addition or ADU budget is what’s behind your walls and under your slab. Older electrical panels, undersized framing, failed waterproofing, and corroded connections all have to be remediated before new construction can pass inspection. We handle that with allowances written into the contract and change orders priced and approved in writing before we touch anything. You’ll never get a surprise invoice from Barrett & Sons. Call (877) 610-1318 and we’ll give you a free estimate with real numbers, and every number stays on paper.
We Also Serve Cities Near North Miami Beach
Our crews work throughout the North Miami Beach area and the surrounding communities. Homeowners in Ojus, Sunny Isles Beach, Aventura, and Hallandale Beach call us for the same reason North Miami Beach does: written scopes, permits pulled, and a real person on the phone 24/7. If you’re just over the county line or a few miles south, we’ll come take a look. Our Home Additions & ADU in North Miami Beach team covers the whole 33160 corridor and the surrounding Miami-Dade communities.
Serving North Miami Beach, FL - Our Local Coverage Area
We’re based in the North Miami Beach 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 North Miami Beach
A permit in North Miami Beach takes longer because the 33160 ZIP sits inside Miami-Dade County’s High Velocity Hurricane Zone, which requires a Miami-Dade Notice of Acceptance (NOA) number on every window, door, and roof product, not just Florida state approval. You’re also dealing with dual-layer review: City of North Miami Beach inspectors plus Miami-Dade County Building and Neighborhood Compliance. If a sub submits a product that passes in Broward, it triggers a stop-work order here. We verify NOA numbers during design, not after submittal, and that’s what keeps our schedules predictable. Call (877) 610-1318 to get your ADU permit package started right.
In much of North Miami Beach, the water table sits 2-4 feet below grade, which makes standard slab-on-grade footings unreliable for a new detached ADU. You’ll need a geotechnical survey and, in most cases, engineered pilings or deep footings to keep the structure stable and pass inspection. We write that allowance into the contract up front rather than “discovering” it after excavation. Call (877) 610-1318 for a free estimate that accounts for your lot’s actual soil conditions.
Yes. Once you pull a permit for an addition to an older North Miami Beach home, the city will require the entire window envelope to meet current HVHZ standards, which means those original single-pane jalousie windows have to go. The replacement windows must carry Miami-Dade NOA numbers. We include that cost as a written allowance in every addition contract so you’re not blindsided by the requirement. It’s cheaper to plan for it up front than to get a stop-work order mid-job.
Salt air from both the Atlantic and the Intracoastal attacks structural steel, anchor bolts, and metal fasteners faster in North Miami Beach than in inland locations, so we spec marine-grade or hot-dip galvanized connections on every second-story addition. Original anchor bolts on a 1960s CBS home are often already corroded. We inspect them before framing starts and replace anything compromised. Shortcut this and you’ll see rust stains and structural degradation within a few hurricane seasons.
You can try, but the dual-layer permit process, HVHZ product requirements, and water table issues in the 33160 ZIP make a DIY garage conversion risky. We’ve seen homeowners open walls and discover original roof ties that were never inspected, forcing a full roof retrofit to current code that doubles the schedule and the budget. A general contractor who knows North Miami Beach’s specific triggers will catch those issues before demo, not after. Call (877) 610-1318 and we’ll give you an honest read on your garage conversion scope.
Get Your North Miami Beach Addition or ADU Started Right
The biggest risk to your North Miami Beach project is a budget that moves after walls are open. We handle that differently. Every scope, every allowance, every price change arrives as a written change order before work happens. Permits get pulled. Inspections get signed. And if it’s not done right, the 90-Day Done Right Promise brings Tom back, one call. That’s the deal we’ve run since 1998, and it’s why North Miami Beach homeowners keep our number.
Call Barrett & Sons Construction at (877) 610-1318 for a free estimate on your home addition, ADU, garage conversion, or second story. We’ll walk the property, tell you what North Miami Beach’s code and soil actually require, and put every dollar on paper before a single nail moves.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving North Miami Beach and surrounding Miami-Dade communities.