Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Plant Prefab Home Additions & ADU: The Fort Lauderdale Owner’s Guide
Plant Prefab home additions and ADUs in Fort Lauderdale typically run $45,000 – $130,000 installed, depending on square footage, site prep, and finish level. We stock the connection hardware, weatherproofing materials, and interior finish components needed to tie a Plant Prefab module into an existing home, and we can usually begin site work within two weeks of your written approval. Most owners call us when a previous contractor’s site work has failed, or when the module-to-house connection point starts showing water intrusion after a Florida storm season.
Trevor Nash has walked more than a few Plant Prefab sites in Fort Lauderdale, and the pattern is consistent: the module itself is usually fine. It’s the marriage wall, the flashing, and the foundation-to-module connection that fail in our humidity and hurricane-driven rain. That’s where we come in.
Key Takeaways:
- Installed Plant Prefab additions and ADUs in Fort Lauderdale run $45,000 – $130,000.
- The most common failure point is the connection between the existing house and the prefab module, not the module itself.
- We provide a written price before any work starts, and a 365-Day Done Right Promise on every job.
- Plant Prefab is a manufacturer. Penhallow Remodeling Fort Lauderdale is an independent contractor that installs, repairs, and finishes their modules locally.
Which Plant Prefab Models This Applies To
Plant Prefab builds custom and semi-custom homes in their factory, then ships modules to your site for assembly. Their product lines shift over the years, but the connection hardware on a Plant Prefab addition tends to follow the same logic regardless of series: a marriage wall where the module meets the existing structure, a weatherproofing membrane at that seam, and a foundation system specified for the module’s weight. If you’re adding a Plant Prefab ADU to a Fort Lauderdale lot, you’re also dealing with city setback requirements and flood zone elevation rules that a manufacturer’s standard plans don’t always account for.
Identifying your exact module spec matters more than the marketing name. Look for the metal ID plate, usually mounted inside a closet or under the kitchen sink, which lists the module’s serial number, manufacture date, and the structural specification it was built to. That spec tells us what anchor system, flashing profile, and interior finish materials are compatible. We’ve also worked with KraftMaid and Wellborn cabinetry, Cambria and Silestone countertops, and other trade brands inside these modules, so the interior finish side is familiar ground.
On the OEM-versus-aftermarket question: for structural connectors, flashing, and weather barriers, we use materials that meet or exceed the original spec. There is no reason to wait six weeks for a “Plant Prefab branded” flashing profile when the same gauge and profile is on a shelf in Broward County. For interior finish components like cabinet hardware or countertop material, we can match what’s there or upgrade it, depending on what you want to spend.
Styles & brands we work with
Signs Your Plant Prefab Home Additions & ADU Is Failing
- Water staining on the ceiling along the marriage wall. This usually means the flashing between the existing house and the module has pulled away or was never lapped correctly. In Fort Lauderdale’s afternoon thunderstorms, that gap pulls water in fast. The fix is re-flashing, not caulk.
- Doors that stick or gaps opening between the module and the house. This is differential settling. The module sits on one foundation system, your original house on another. If they move at different rates, the connection point shows it first. A structural shim or anchor adjustment usually resolves it.
- Musty smell inside the module after heavy rain. That’s moisture trapped in the marriage wall cavity. It means the weather barrier has failed and it’s been wet long enough for mildew. This is not a smell that goes away on its own.
- Cracks in the drywall where the module meets the main structure. Small, straight cracks at that seam are common in the first year as the building settles. Cracks wider than a quarter inch, or cracks that run diagonally, indicate real movement and should be looked at.
- High humidity inside the ADU despite the AC running. Often the module’s vapor barrier was punctured during a prior repair, or the connection point is allowing humid outdoor air into the wall cavity. Your AC can’t dehumidify air that’s constantly being replaced by outdoor moisture.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
A full Plant Prefab home addition in Fort Lauderdale runs $45,000 – $130,000 installed. That range covers the concrete or pier foundation, crane or modular set, marriage wall connection, flashing and waterproofing, electrical and plumbing tie-ins, drywall finish at the seam, and trim work. A detached ADU using Plant Prefab modules lands higher because you’re starting from bare ground, around $90,000 – $220,000 depending on size and utility connections.
What drives the number up: site access for modular delivery, flood zone elevation requirements, and the condition of the structure you’re tying into. An addition on a canal-front lot in Fort Lauderdale that needs pilings is a different job than a ADU on a standard infill lot. We give you a written line-item price before the first crew member shows up. That price includes the structural connection work, all materials, all permits, and our 365-Day Done Right Promise in writing. The number you sign is the number you pay. If something fails inside the guarantee period, we come back. No service call fee, no re-inspection fee.
Tell me what you need, I’ll tell you what it costs – then we’ll get it done.
DIY or Call Us?
There are three things you can safely do yourself. First, document what you’re seeing: photos of stains, gaps, and cracks with a tape measure in the frame for scale. Second, check that your gutters and downspouts are clear and discharging away from the marriage wall. Third, run a dehumidifier inside the module while you wait for us to arrive. That’s it.
Do not attempt to adjust anchors, remove drywall at the marriage wall, or re-flash the connection point yourself. The anchor points are under tension, and the marriage wall carries structural load from both buildings. Botching the weatherproofing at that seam means water gets into the wall cavity, and by the time you see it, the damage is already significant. Working at the module-to-house connection also means working at height, and on a Fort Lauderdale afternoon with a thunderstorm rolling in, that’s a bad combination for a homeowner on a ladder. Call (754) 551-2922 and we’ll come out, look at what you’re dealing with, and put a number in writing.
FAQs
A properly installed Plant Prefab module has a 50-year structural lifespan, but the connection point to your existing home needs re-inspection every 5 – 7 years in Fort Lauderdale’s climate. The module is factory-built and tight; the marriage wall is field-built and that’s where Florida weather does its work. We include a written 365-Day Done Right Promise on every connection we build, so if something fails within that year, we fix it at no charge. Call (754) 551-2922 for an exact assessment of your site.
Yes, in most cases the connection point can be repaired without disturbing the module itself. We remove the damaged flashing, inspect the wall cavity for moisture damage, replace the weather barrier, and re-install the flashing correctly. If the framing behind the connection has rotted, we replace that section. This typically costs $3,000 – $8,000 depending on the extent of the damage, and it’s far less than the cost of replacing the module. Call (754) 551-2922 and we’ll give you a written price before any work starts.
Site work, foundation, and module set typically take 4 – 8 weeks depending on permitting and site access. Interior finishing at the marriage wall and utility tie-ins add another 2 – 4 weeks. We give you a defined arrival window in writing, and a background-checked, uniformed crew on every day of the job. The schedule we put in writing is the schedule we work to. Call (754) 551-2922 to schedule your free estimate and get a realistic timeline for your specific site.
Yes. We stock flashing profiles, weather barrier materials, anchor hardware, and interior finish components in common Fort Lauderdale specs. The materials are sourced to meet the module’s structural specification, not just the manufacturer’s part number. This means we’re not waiting on a factory shipment to get your connection weathertight. We also carry KraftMaid, Cambria, and Silestone finishes for the interior side if you’re expanding or renovating the existing ADU. Call (754) 551-2922 and we’ll confirm what’s on the truck for your model.
Written by Trevor Nash, Owner, Penhallow Remodeling Fort Lauderdale at Penhallow Remodeling Fort Lauderdale, serving Fort Lauderdale and nearby areas.
