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Mighty Buildings Home Additions & ADU: The Fort Lauderdale Owner's Guide
Mighty Buildings home additions and ADUs in Fort Lauderdale typically run $45,000 to $130,000 for the construction and installation work, with most owners reaching out to us after discovering a problem with panels, seams, or the connection points where the modular sections meet the main structure. We stock the common fasteners, sealants, and trim profiles that keep these units watertight, and we can usually match a part or source it within days, not weeks.
Most owners catch a failing part two ways: a water stain spreading on an interior wall after a heavy South Florida downpour, or a door that suddenly doesn’t close square because a corner connection has shifted. Both point to the same root issue – the building envelope has a gap somewhere, and the humid, salt-heavy Fort Lauderdale air is doing what it does best. If you’re seeing either, don’t wait. A small sealant failure today becomes a mold problem and panel replacement in a month.
We’re an independent service provider. We install, repair, and maintain Mighty Buildings structures, but we’re not affiliated with the manufacturer. That works in your favor: we call problems what they are, not what a warranty department wants to hear.
Which Mighty Buildings Models This Applies To
Mighty Buildings produces panelized and modular accessory dwelling units and home additions in a range of sizes, from compact studio units around 350 square feet up to two-bedroom configurations exceeding 800 square feet. The panels themselves are a fiber-reinforced polymer composite, which is a deliberate choice for a climate like ours: it doesn’t rot, termites ignore it, and it doesn’t care much for moisture. What fails first in Fort Lauderdale isn’t the panel. It’s the interface points – the sealant joints, the roof-to-wall transition, the base track where the unit meets the concrete pad.
Compatibility on these units comes down to three things: panel thickness, exterior finish generation, and what kind of connection hardware the unit was built with. Older units from the company’s early production runs used a different corner assembly than what ships now. You can identify your unit’s generation by looking at the serial tag on the interior face of the first panel to the right of the main entry door. The last two digits of the production code tell you the hardware series. We match parts to that code, not just to “a Mighty Buildings ADU” – because the wrong fasteners will hold for a season and then start walking loose under hurricane wind cycles.
For OEM versus aftermarket: Mighty Buildings uses proprietary panel material, but the sealants, flashing, weather stripping, and fasteners are commercial building products you can source at spec or better. We carry Sika and OSI sealants approved for polymer-to-concrete and polymer-to-metal joints. For panel repair itself, OEM is the only route, and lead times matter. We’ll tell you upfront if a panel needs to come from the manufacturer and how long that realistically takes.
Styles & brands we work with
Signs Your Mighty Buildings Home Additions & ADU Is Failing
- Water staining at wall-to-ceiling corners. This is almost always a roof-to-wall sealant joint that has separated in the Florida heat. The sealant cures, shrinks, and then the afternoon thunderstorms do the rest.
- A door that drags or won’t latch square. The frames in Mighty Buildings units are set into the panel system. If the unit settles or a corner connection loosens, the door tells you first. It’s rarely a hinge problem – it’s geometry.
- Condensation inside wall cavities, visible as bubbling or micro-cracking in the interior finish. This means the vapor barrier has a puncture or the panel joint tape has failed. Fort Lauderdale humidity pushes moisture into any opening it finds.
- Gaps widening at the seam between the Mighty Buildings unit and the main house. This is the connection point most people never look at. Thermal expansion between a polymer panel unit and a concrete block house is a real force, and the transition flashing takes that beating every single day.
- A dull hum or creaking sound during high wind. Not always structural, but it’s a sign a panel fastening point has worked loose. If a panel can flex, it can crack, and a cracked composite panel is a replacement, not a repair.
See the difference
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AfterReplacement Cost & What’s Included
Replacement and repair work on Mighty Buildings home additions and ADUs in Fort Lauderdale falls into three general bands:
- Sealant joint repair and re-flashing: $400 to $1,800, depending on linear footage and how much old material needs to come out.
- Panel fastening point repair, frame re-alignment, or connective hardware replacement: $2,500 to $8,500, depending on access and whether a panel has to come partially off.
- Full home addition or new ADU construction with Mighty Buildings panels: $45,000 to $130,000, which includes foundation, panel installation, finish work, and connection to the main structure.
Every job we quote in Fort Lauderdale carries a written price before any work starts, and that’s not a favor we do – it’s how we’ve operated since 2004. What drives the range on this kind of work is access, panel condition, and whether the failure is at ground level or up a ladder. If the unit needs to be tied into existing plumbing or electrical, that’s line-item priced separately. We pull the permits, we schedule the inspections, and we cover the work with our 365-Day Done Right Promise: if something isn’t right within a year, we come back at no charge.
DIY or Call Us?
Here’s the honest split. You can safely do a visual inspection: check the sealant lines for cracks, look at the door margins with a level if you have one, and clear any standing water away from the base track. That’s useful information for us and it costs you nothing.
But the moment you’re talking about removing a panel, working on roof transitions, or digging near the foundation connection, you’re into danger territory. Panels under load can shift, a ladder on a two-story ADU roof during a Fort Lauderdale squall is not where you want to learn about wind, and pulling the wrong fastener can compromise the structural integrity of the entire unit. We tell you what we found, what it takes to fix it, and what it will cost – before we touch a thing. If you’re seeing any of the symptoms above, call (754) 354-3720 and we’ll put eyes on it. The estimate is free.
FAQs
The polymer composite panels themselves are rated for decades of service, but the sealant joints that hold the unit watertight typically last 5 to 8 years in Fort Lauderdale’s heat, humidity, and salt air before they need re-sealing. Budget for joint maintenance on that interval and the panels will do their job. Call (754) 354-3720 to have us inspect your joints – the estimate is free.
Minor surface cracks can sometimes be patched with an approved composite repair kit, but structural cracks, punctures through the fiber reinforcement, or any damage larger than a deck of cards almost always means panel replacement. We’ll give you a straight answer before you spend a dollar. Call (754) 354-3720 for a no-obligation assessment.
A sealant joint repair is usually a one-day job. A connection hardware repair or frame re-alignment runs two to four days. A full panel replacement depends on manufacturer lead time, which currently runs two to six weeks for most sizes. We give you the schedule in the written quote, not a vague promise. Call (754) 354-3720 and we’ll tell you what your specific repair involves.
We stock common sealants, flashing, fasteners, and connection hardware in our Fort Lauderdale trailers. Panel material itself is OEM and must be ordered from Mighty Buildings for the correct fit and spec. We also work with KraftMaid, Cambria, and Silestone products for interior finishes on ADU and addition projects. Call (754) 354-3720 and we’ll check what’s on hand for your unit.
If your Mighty Buildings addition or ADU is showing signs of trouble, or you’re planning a new unit and want someone who knows the product line, call Mason Remodeling Co Fort Lauderdale at (754) 354-3720. Isaac Pruett and our crew will take a look, give you a written price, and tell you exactly what’s needed. No drama, no surprises, no pressure.
Written by Isaac Pruett, Owner, Mason Remodeling Co Fort Lauderdale at Mason Remodeling Co Fort Lauderdale, serving Fort Lauderdale and nearby areas.
