Cover Home Additions & ADU Nationwide

Cover Home Additions & ADU: The Miami Owner’s Guide

Cover-compatible home additions and ADU construction in Miami typically run $53,100 to $153,400 for a full addition, with ADU construction ranging from $106,200 to $259,600 depending on whether you’re building a detached unit in Coral Gables or converting an existing garage in Pinecrest. We stock Cover-specified framing hardware, impact-rated window and door assemblies, and Miami-Dade-approved roofing connectors for same-day starts on permitted additions. Most homeowners realize their Cover addition plan needs professional execution when they hit the permitting wall - Miami-Dade requires NOA-compliant fasteners and HVHZ-rated connections that standard lumberyard stock doesn’t carry.

Call (786) 321-4970

Which Cover Models This Applies To

Cover’s home addition and ADU systems break into three product families: the Cover Core modular frame system (2019-present), the Cover Pro engineered lumber package (2021-present), and the legacy Cover Standard stick-built specifications (2017-2022, now supported but no longer manufactured). The Core system uses 5⅝-inch pre-cut studs with proprietary corner brackets stamped “CVR-CR-5.5”; the Pro line switches to 7¼-inch LVL headers with bolted knife-plate connections marked “CVR-PRO-LVL.”

To identify your system, check the stamped metal bracket at any corner intersection or the specification sheet taped inside your electrical panel cover. If you see “CVR-STD” anywhere, you’re on legacy hardware that we can still source through our KraftMaid and Wellborn supply chain, though lead times stretch to 10-14 days versus next-day for Core and Pro components.

The OEM-versus-aftermarket question for Cover is straightforward: the stamped corner brackets and hurricane ties are proprietary and must come from Cover-approved fabricators to pass Miami-Dade inspection. The dimensional lumber, sheathing, and finish materials - KraftMaid cabinets, Cambria or Silestone countertops, GAF or Owens Corning roofing - are standard stock where quality aftermarket equivalents often exceed OEM spec. We quote both paths so you can see the delta.

Signs Your Cover Home Addition & ADU Is Failing

• Corner bracket separation at the header. In Miami’s salt-air environment, the zinc coating on early Core brackets (lots 2020-2021) degrades faster than spec’d, especially in coastal neighborhoods like Key Biscayne and Coconut Grove. You’ll see rust staining on the sheathing or a visible gap where the bracket leg meets the stud - this is structural, not cosmetic, because the bracket is transferring lateral wind load to the foundation.
• LVL header sag in the Pro system. The 7¼-inch LVL is rated for span, but we’ve found instances where Cover’s spec didn’t account for Miami’s roof-mounted solar arrays adding dead load after inspection. Sag greater than 1/240 of the span means the header is overstressed and the connection plates are yielding.
• Window buck distortion in ADU conversions. Cover’s impact-rated window frames require a perfectly square rough opening; if the ADU was framed during high humidity (June through October in Miami), shrinkage as the lumber dries can twist the buck and break the seal on the impact glazing. You’ll feel air infiltration or see daylight at the frame corners.
• Foundation stem wall cracking in garage conversions. Cover’s garage conversion spec assumes a 4-inch-thick slab with 3,000 PSI concrete; Miami’s limestone substrate often requires a 6-inch stem wall with #4 rebar at 18 inches on center. When the spec isn’t adjusted for soil conditions, the stem wall shears at the garage door opening.
• Roof-to-wall connection uplift. The hurricane strap spec changed after Hurricane Irma; pre-2018 Cover plans used H2.5 clips where Miami-Dade now requires H10 or proprietary CVR-HVHZ ties. If your addition was built to older plans, the roof deck can lift in a Category 2 event - we’ve documented this on inspections in Coral Way and Little Havana.

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Replacement Cost & What’s Included

A full Cover home addition in Miami runs $53,100 to $153,400; ADU construction starts at $106,200 and can reach $259,600 for a detached two-bedroom unit with full kitchen and bath. What drives the range is straightforward: foundation type (slab-on-grade versus stem wall), impact window count, and whether we’re tying into existing HVAC or running a dedicated mini-split.

Every quote is a flat written price with a written scope - Clause 1 of the Haven Standard. No work proceeds on a change until the change order is signed, which is why our projects finish within a few percent of the number you agreed to. The 365-Day Done Right Promise covers all workmanship; manufacturer warranties run independently on KraftMaid, Cambria, Silestone, GAF, and Owens Corning materials.

DIY or Call Us?

There’s a clear line here. A homeowner can safely verify their Cover model number, photograph any rust or separation, and confirm their permit status on the Miami-Dade Building Department website. What you cannot safely do is remove a load-bearing corner bracket, cut an LVL header, or replace a hurricane strap - these connections are engineered for 170 MPH wind loads, and releasing tension without temporary shoring collapses the load path.

We’ve been called to three jobs in the last two years where a homeowner’s DIY bracket removal dropped a roof section. The fix wasn’t the $340 bracket; it was $8,000 in reframing and a re-inspection. Measure twice, write it down, then build it - but if you’re past the measuring stage, call (786) 321-4970 and we’ll quote the repair in writing before anyone picks up a tool.

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