Best Bathroom Renovation Contractor in Miami: What to Check Before You Sign

A bathroom is the smallest room in the house and the easiest one to ruin. It concentrates plumbing, waterproofing, electrical, ventilation, stone, glass, and millwork into a few dozen square feet — and every one of those trades has to land within a tolerance the eye can catch from the doorway. In a Miami condo, add a building board, a shared plumbing riser, and neighbors below you who will absolutely notice a slow leak. The contractor you hire is the whole ballgame.

We're Metro Design-Build. Three generations of this family have built in Miami — Joseph Alter, who invented the Murphy bed; Herman Alter, who ran a South Beach shop; and David Eyal Alter, who earned his Florida GC license at 19 and holds a broker's license as well. We renovate bathrooms with 30+ in-house professionals and our own millwork shop. What follows is the checklist we'd give a friend evaluating contractors — including how they should evaluate us.

What goes wrong in Miami bathroom renovations — and who pays for it?

Water. Nearly every bathroom failure is a water failure: a shower pan that wasn't flood-tested, a niche that wasn't membraned, a curbless shower with the slope guessed instead of calculated, a tub deck that lets water track behind the tile. The failures don't show up at the walkthrough. They show up in year two, as a stain on the ceiling below — which, in a tower, is someone else's ceiling and your insurance claim.

That's why the first thing to establish is who actually performs the waterproofing and who inspects it before tile goes on. In a subbed-out job, the plumber, the waterproofer, and the tile setter are three different companies, and the joints between their scopes are exactly where leaks live. A firm with in-house trades owns the whole assembly — the pan, the membrane, the flood test, the tile — under one accountable name. That's the argument for the design-build model in general, and we've laid it out at length in our guide to the best general contractor in Miami.

Does the contractor understand condo bathroom work, specifically?

If your bathroom is in a tower in Miami Beach, Sunny Isles, or Aventura, this question outranks all the others. A condo bathroom renovation is a negotiation with the building as much as a construction project: board approval packages, insurance certificates naming the association, elevator reservations, floor protection, noise windows, and — critically — the plumbing riser. Your drain and supply lines tie into stacks shared with every unit above and below you. Moving a toilet or converting a tub to a shower means working within (or formally modifying) that system, with the building's engineer watching.

Ask a candidate contractor to walk you through their last three condo jobs: which buildings, what the board required, how tie-ins to the risers were handled. Vague answers mean you'll be their education. We've run this gauntlet at Akoya (the 'Jetsons Condo'), the Peninsula in Aventura, and the Armani tower in Sunny Isles — and we've written a dedicated guide to picking the best condo renovation contractor in Miami if that's your situation.

At the Joy Fishman Residence, we combined two condos into one 3,000-square-foot home. Bathrooms had to be rebuilt where two separate units' plumbing systems used to end — a condition no standard detail covers. That kind of work only closes cleanly when design, plumbing, and finish trades answer to one company.

Do I need a permit to renovate a bathroom in Miami?

Almost certainly yes. Swapping a faucet is cosmetic; moving a drain, relocating fixtures, altering electrical circuits, or touching anything structural requires a permit, and Miami-Dade and the coastal municipalities enforce this more rigorously than almost anywhere in the country. A licensed, insured Florida GC pulls the permit under their license and carries the liability — which is precisely what you're paying for. Unpermitted bathroom work surfaces later, at the worst time: in the 40-year recertification file, the buyer's inspection, or the insurance adjuster's report after a leak.

If the scope touches the building envelope — a new window at the tub, a wall opened to a terrace — the products must be Miami-Dade NOA-approved and rated for high-velocity hurricane zones. A contractor who can't explain the NOA process without notes hasn't built much here.

Why does millwork matter in a bathroom?

Because the vanity is the bathroom's one piece of furniture, and catalog vanities are built for average walls, average plumbing locations, and average sizes — none of which describe a renovated Miami bathroom. In-house millwork means the vanity is designed to your as-built walls, your stone, and your fixtures: integrated pulls, grain-matched fronts, drawers engineered around the P-trap instead of hacked out on site. The same goes for medicine cabinets recessed flush into furred walls and linen towers that align with door head heights.

When the shop drawings, field measurements, and installation are one chain — as they are with our expert carpentry team — an out-of-plumb wall gets resolved in the shop, not disguised with caulk. In full-gut renovations like the Stern Residence, or projects like Ortega in Coral Gables and Cummings in Miami Shores, the bathrooms hold the same tolerance standard as the rest of the house because the same hands build all of it. You can see how that plays out across whole homes in our residential renovations work.

How do I compare bids without getting burned?

Bathroom bids are where scope games hide, because the expensive parts are invisible. Three rules:

1. Compare the waterproofing spec, not the tile allowance. Any bid that doesn't name the membrane system and include a flood test is incomplete.
2. Demand a fixture-by-fixture schedule. "Allowance: $X for plumbing fixtures" is how a low bid stays low until you pick actual fixtures.
3. Ask what happens when demolition finds a surprise. Behind fifty-year-old Miami tile you will find something — corroded galvanized pipe, a rotted curb, an undocumented vent. The honest answer describes a documented change process, not "we'll work it out."

The structural fix for all three is design-build: design the bathroom first, price it from real drawings, then contract. One team, one number, no architect-versus-contractor finger-pointing. Our sequence is documented step-by-step in our process, and if you're weighing a larger scope while the trades are mobilized, our guide to the best high-end remodeling contractor in Miami covers how the evaluation changes at whole-home scale.

Why hire a three-generation firm for a bathroom?

Because bathrooms are where institutional memory pays. Knowing how a 1950s Coral Gables slab behaves when you trench it for a new drain, which inspectors want to see the flood test personally, which buildings' risers are cast iron at the end of their life — that knowledge takes decades to accumulate and it changes both the price and the schedule. In Coral Gables and Miami Beach, where review processes have real teeth, it's worth months.

It also means the incentives are right. A family name that has built in one city for three generations cannot afford a leak callback handled badly. A franchise can.

How long does a bathroom renovation take in Miami?

A full gut bathroom runs weeks of construction after design and permitting — longer in condos, where board approval and work-hour restrictions stretch the calendar. Anyone promising a gut renovation in a week is describing a resurfacing job.

How much does a bathroom renovation cost in Miami?

It depends on four variables: whether fixtures move, the waterproofing and shower construction, the stone and tile specification, and the millwork. Any contractor quoting a number before design and a site visit is guessing, and the guess becomes a change order. Price from drawings, not from a phone call.

Can I renovate a condo bathroom without board approval?

No — and you shouldn't want to. The association's process protects you when your upstairs neighbor renovates, too. A contractor experienced with your building's requirements turns approval into paperwork instead of a stall.

Ready to talk through your bathroom? Contact us or call 305-300-7996.