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Kohler Home Additions & ADU: The Fort Lauderdale Owner’s Guide
We handle home additions and ADU construction for Kohler homes throughout Fort Lauderdale, and a full-scale addition or accessory dwelling unit in this market typically runs $45,000 to $130,000 for the addition, with ADU construction landing between $90,000 and $220,000 depending on square footage, foundation work, and finish level. Most owners don’t come to us because the Kohler fixtures failed. They come to us because the house ran out of room, or an aging parent needs to live close by, or the garage has become a storage unit that should be a rental. And they want a builder who will tie new plumbing, new electrical, and new living space into a home that already holds Kohler fixtures they don’t want to replace.
Trevor Nash has spent the better part of two decades running crews across South Florida, and he’ll tell you the same thing his notebook of finished projects shows: a Fort Lauderdale addition lives or dies by how it handles humidity, hurricane code, and the transition where old slab meets new. Get any one of those wrong and you’ll see cracks in the drywall within a year, condensation on the new windows, or tile that pops off the floor by the second humid summer.
Which Kohler Models This Applies To
We’re talking about the house, not the faucet. If your Fort Lauderdale home has Kohler fixtures, the addition and ADU work we do is designed to match what’s already there. The compatibility question is less about a Kohler model number and more about the plumbing rough-ins, drain placement, and fixture spacing Kohler products require when you’re tying a new bathroom or kitchen into existing lines.
Here’s the gotcha most people don’t know: Kohler wall-hung toilets and many of their vessel sinks require different rough-in heights than standard builder-grade fixtures. If you’re adding a bathroom to the back of the house and you want a Kohler wall-hung unit to match the one in the master bath, the framing crew needs to know that before the drywall goes up, not after. We measure every rough-in against the specific Kohler spec sheet for the fixtures you’re keeping or adding, because a carrier set at 32 inches when the fixture wants 28 inches is a tear-out. That’s the kind of detail that separates a clean addition from a change order.
We also work with homeowners who want a new ADU with Kohler fixtures throughout. KraftMaid and Cambria or Silestone countertops often enter the same conversation if the ADU includes a small kitchen. None of that is required. But if you’re building a rental unit or an in-law suite in Fort Lauderdale, using the same fixture line across both structures means fewer spare parts to keep track of and one warranty conversation if anything fails.
Styles & brands we work with
Signs Your Kohler Home Addition & ADU Is Failing
- Hairline cracks along the seam where the new slab meets the old foundation. This is the most common call we get three to five years after someone else’s addition. The cause is almost always improper soil compaction or missing rebar dowels at the tie-in. In Fort Lauderdale’s sandy soil, the new section settles at a different rate than the original slab, and the crack is where the two argue.
- A door or window within the addition that won’t close square. When the new framing shifts or the foundation settles unevenly, the first sign isn’t always a crack in the wall. It’s the door that rubs the frame at the top corner. That tells you the opening has moved out of plane.
- Condensation between the old roofline and the new addition. Poorly flashed transitions between roof sections trap moisture, and South Florida humidity pushes that moisture straight into the ceiling cavity. If you see water staining near the junction where the addition roof meets the original roof, the flashing was likely lapped wrong.
- A bathroom in the addition that gurgles when you flush or drains slow. The vent stack was undersized or tied in too far from the fixture. Kohler fixtures with wider drain traps make the problem more visible, because the fixture drains faster than the line can carry it. The gurgle is the pipe gasping for air.
- Electrical flicker when the AC or a heavy appliance kicks on inside the addition. The subpanel feeding the new space is either undersized or the circuit was tapped off an existing line that was already near capacity. In a Florida summer, that’s not just an annoyance. It trips breakers when you need the air handler most.
See the difference
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AfterReplacement Cost & What’s Included
In Fort Lauderdale, a home addition runs $45,000 to $130,000, and an ADU runs $90,000 to $220,000. Where your project lands inside that range comes down to three things: the size of the footprint, whether you’re building on a slab or over a crawl space, and the finish level of the Kohler fixtures and cabinetry you select.
Every project gets a written price before any work starts. Not an estimate range. Not a verbal ballpark. The number on day one is the number on the invoice, and if we uncover something inside the wall that changes the scope, we stop, explain it, and put the revised number in writing before we pick up the next tool. You’ll also get our 365-Day Done Right Promise, in writing, on every addition and ADU we build. If the work fails inside the guarantee period, we come back and fix it at no charge. That’s the Kingswell standard, and it’s been in place since 2004.
Concrete in South Florida costs more than it does inland, and hurricane strapping and impact-rated openings add real dollars. Fort Lauderdale’s wind-borne debris zone requirements mean the windows and doors on your addition aren’t optional upgrades. They’re code. We pull permits, schedule inspections, and pass them before you make the final payment.
DIY or Call Us?
You can check a few things yourself. Walk the seam between old slab and new with a straightedge. Look at the flashing where the two rooflines meet. Note where the gurgle comes from and how often the breaker trips. Knowing what’s failing is useful, and it makes the first conversation we have faster and more honest.
What you shouldn’t do is open the wall. Fort Lauderdale homes built before the mid-1980s may have wiring and framing conditions that don’t match current code, and once you’ve opened the envelope, you’ve created a moisture entry point in a climate that doesn’t forgive mistakes. A diy patch on a failed tie-in can hide the symptom for a season and make the real repair twice as expensive later. If the addition is failing at the foundation or the roof, that’s structural work. It requires permits, engineering, and a crew that knows what a Miami-Dade uplift bracket looks like. That’s us. Call (754) 551-2922 and tell us what you’re seeing. We’ll tell you what it costs.
FAQs
A properly built addition in Fort Lauderdale should give you 25 to 40 years before the envelope needs major attention, provided the original slab tie-in, roof flashing, and moisture barriers were done correctly. The first failure points are typically caulk joints, window seals, and door thresholds, and those are maintenance items you’ll touch up every few years, not structural failures.
It depends on where the failure is. A poorly flashed roof transition can usually be repaired by stripping the shingles or tile at the junction, replacing the flashing, and resealing. A foundation settlement crack at the slab tie-in may need helical piers or slab jacking, and that’s a bigger job, but it’s rarely a full teardown unless water intrusion went unnoticed for years. Call (754) 551-2922 and we will look at it and give you a straight answer.
Most ADU projects in Fort Lauderdale take 6 to 10 months from permit application to final inspection. The permitting process alone can run 6 to 10 weeks depending on the municipality’s current queue. Construction on a detached ADU typically runs 4 to 7 months once permits clear.
Yes. We pull every permit required for your addition or ADU, we schedule the inspections, and we don’t ask for the final payment until the job passes final inspection. Your written contract includes the permit line, so there’s no surprise fee later.
If you’re weighing a Kohler-matched home addition or ADU in Fort Lauderdale, call (754) 551-2922 for a free estimate. Tell me what you need, I’ll tell you what it costs, then we’ll get it done.
Written by Trevor Nash, Owner, Penhallow Remodeling Fort Lauderdale at Penhallow Remodeling Fort Lauderdale, serving Fort Lauderdale and nearby areas.
