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CWS Home Additions & ADU: The Miami Owner’s Guide
Home additions and ADU construction in Miami typically run $53,100 to $153,400 for a full project, and we install and build CWS-compatible additions from permit to final inspection. Most owners find us when an existing structure has failed at the roofline or foundation tie-in, or when they need a permitted accessory dwelling unit fast. We stock the framing hardware, tie-downs, and structural connectors that match CWS specifications, and our crew can usually be on site within days of your call.
What usually brings people to this page: a sagging ridge line where the addition meets the original house, water staining at the seam, or a foundation that has settled enough to crack drywall. In Miami’s heat and hurricane-season wind loads, those failures don’t wait politely. They get worse through one summer storm cycle.
Which CWS Models This Applies To
CWS addition and ADU structures use a standardized floor-to-wall and wall-to-roof connection system. The compatibility point that matters most is the anchor bolt spacing and the hold-down type at the shear wall. If you’re looking at an existing CWS addition, check the sill plate: bolts are typically 24 inches on center, with Simpson or USP hold-downs at the panel edges. If your plans call for a detached ADU, the floor system usually calls for 2×10 or 2×12 joists on a stem wall or slab, with a ridge beam size that changes based on span. Bring us your original permit drawings, and we’ll match the hardware exactly. If the drawings are long gone, we take field measurements and spec the correct connectors before anything gets ordered.
On the OEM-versus-aftermarket question: CWS hardware is well made, but most of the structural connectors come from suppliers like Simpson Strong-Tie, USP, and MiTek. Those are professional-grade equivalents that meet the same Miami-Dade wind load tables. We stock those brands on the truck for ordinary call-outs and special-order only the pieces that are genuinely CWS-specific.
Styles & brands we work with
Signs Your CWS Home Additions & ADU Is Failing
- Cracked drywall at the seam where the addition meets the original house. This usually means differential settlement. One structure is moving more than the other, and the weakest point is always the tie-in.
- A ridge line that sags or dips visibly from the street. In Miami’s humidity, undersized ridge beams or failing connectors show themselves within a few years, especially on spans over 20 feet.
- Doors or windows in the addition that stick or won’t latch. When the floor system starts to move, the door frames go out of square first. It’s the cheapest problem to fix early and the most expensive to ignore.
- Water staining at the ceiling or wall corners where the addition meets the roofline. The flashing detail at a CWS tie-in is the most common place for leaks. It fails quietly, then the rot starts.
- A bouncy or springy floor in the ADU. That’s a joist sizing issue or a bearing problem, and it means the structure was either underbuilt or has been overloaded. Both happen in Miami more than owners expect.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
Full home addition and ADU work in Miami lands between $53,100 and $153,400 depending on square footage, foundation type, and whether you’re tying into an existing structure or building detached. A smaller bump-out addition with a simple gable roof sits at the low end. A full ADU with a kitchen, bath, and separate meter starts climbing toward the top. The factors that move the number the most are roof framing complexity, the condition of what you’re tying into, and whether we’re pouring new footers or working on an existing slab.
Every quote we write includes permits, plans, all structural hardware, rough framing, tie-in work, and final inspection. It’s a written price before any work starts, and it does not grow on the final bill. We pull permits for every addition and ADU, and the work passes final inspection before we call it done.
| Service | Miami Price Range |
| Home Addition | $53,100 – $153,400 |
| ADU Construction | $106,200 – $259,600 |
| Garage Conversion | $35,400 – $94,400 |
DIY or Call Us?
Structural tie-in work on a CWS addition is not a weekend project. The shear forces at a roof-to-wall connection in Miami’s wind zone can exceed what most homeowners understand from a YouTube video, and getting a hold-down wrong means the roof leaves the building in a hurricane. We see failed DIY tie-ins more often than we’d like, and the repair always costs more than getting it right the first time.
What you can safely do yourself: check for visible cracks, take photos of the permit card or any labels on the connectors, and clear debris from roof valleys and scuppers. What you should not do: add structural wood, remove a wall, or shim a bearing point. If your addition is moving, call us at (850) 780-8123 and we’ll come look at it. We’ll tell you straight whether it’s a simple fix or a full re-tie.
FAQs
A properly built CWS addition should last 50 years or more structurally, but the tie-in flashing and seals need replacement every 10 to 15 years in our climate. Miami’s sun and salt air eat sealants fast, and that’s where most additions start to leak.
Yes, in most cases the tie-in can be reinforced with additional hold-downs, framing anchors, and new flashing without tearing the whole addition down. The repair path depends on how far the structure has moved, and we’ll know within the first hour on site. Call (850) 780-8123 with your address and we’ll schedule the visit.
Most Miami additions and ADUs take 10 to 20 weeks from permit approval to final inspection. Permit review in Miami is the wildcard, and we handle that process end to end. Isaac Pruett will give you a date for completion before we sign anything, and he means it.
We stock the structural connectors, hold-downs, anchor bolts, and flashing that match CWS specifications, plus we maintain accounts with Simpson Strong-Tie, USP, and MiTek for special-order pieces. We also handle parts for KraftMaid, Cambria, and Silestone when your addition includes cabinets or countertops. Tell me what you need done. I’ll tell you what it costs and when it’s finished, and I’ll mean both.
If your CWS addition is showing cracks, leaks, or movement, call (850) 780-8123. We’ll send someone who knows their way around Miami’s structural code, and you’ll get a written price before any work starts. Free estimates, no pressure, no surprises.
Written by Isaac Pruett, Owner, Mason Remodeling Co Miami at Mason Remodeling Co Miami, serving Miami and nearby areas.
