Remodeling a Miami Condo Bathroom: Board Approval, Risers, and Waterproofing.

Two Approvals, Not One

A Miami condo bathroom remodel has to clear two independent gates: the building permit from the City of Miami or Miami-Dade County, and the association approval from your condo board. The permit answers whether the work meets the Florida Building Code; the board answers whether you are allowed to touch what you are touching at all. A bathroom can be fully code-compliant and still be denied by the board, and the board’s review usually has to happen first.

This is the difference between renovating a single-family house and renovating a unit in a tower. In a house you own the slab, the walls, and every pipe in them. In a condominium you own a defined volume of space, and the drain lines your toilet and shower tie into belong to everyone on the vertical line. The governing rules sit in your recorded declaration and in the Florida Condominium Act, Fla. Stat. ch. 718.

Why the order matters

Most South Florida associations require written board approval before a unit owner pulls a permit or starts demolition. Starting work first — even permitted work — can trigger a stop-work demand, fines under the declaration, and an order to restore the unit. A bathroom is the wettest, most plumbing-dense room you can touch, so boards scrutinize it harder than almost any other scope.

What each gate actually reviews

The permit office reviews structure, plumbing, electrical, and mechanical against the code. The board reviews impact on common elements, the shared stack, contractor insurance, elevator and freight logistics, approved work hours, and the waterproofing protecting the unit below. The two reviews overlap least where it matters most: the drains and the membrane.

What the board cares about that the permit office does not

Several board concerns never appear on a code plan review, and missing them stalls more condo bathrooms than any code item:

• Stack impact — whether your scope taps, re-routes, or merely connects to the shared waste riser.
• Downstairs protection — proof of a tested waterproof membrane over the occupied unit below.
• Logistics — elevator padding, freight-loading windows, and approved hours for dust, noise, and debris.
• Contractor paperwork — a current license plus liability and workers’-compensation insurance naming the association.

Clearing these before you apply for the permit is what keeps the two tracks from colliding in the middle of an open wall.

Do You Need Board Approval to Remodel

Yes — in nearly every Miami condominium a bathroom remodel needs the board’s written consent, and the requirement is statutory, not just a house rule. Fla. Stat. §718.111(11)(g) contemplates a unit owner performing reconstruction with the prior written consent of the board of administration, and most declarations add an architectural-review step on top of that.

Cosmetic refresh versus alteration

Boards draw a hard line between a cosmetic refresh and a true alteration. Swapping a vanity, a toilet, a faucet, or retiling a shower in the same footprint is usually waved through with a short notice. The moment you move a wall, relocate the toilet or shower drain, change the floor assembly over an occupied unit, or tie new pipe into the shared stack, you are into formal review.

Cosmetic refresh

Like-for-like vanity, toilet, tub or shower, faucet, tile, and paint in the existing layout. Light board notice; rarely contested.

Material alteration of common elements

Any change to the shared structure or systems — the waste stack, a water riser, a load path, the building envelope. Under Fla. Stat. §718.113(2)(a), if the declaration is silent this needs the approval of 75 percent of the total voting interests before work begins.

That 75-percent threshold is the reason almost no condo bathroom remodel tries to relocate a stack: clearing a building-wide supermajority for one owner’s shower is not realistic. The faster path is to design so no common element is disturbed at all.

What a Shared Riser Stack Is

A riser stack is the vertical waste pipe that carries drainage down through the building, collecting from the stacked bathrooms on every floor. In older South Florida towers it is almost always cast iron, sized around 4 inches for the main soil stack. Because that single pipe serves your unit and the ones above and below it, it is a textbook common element — owned in common, maintained by the association, and off-limits to any one owner.

Why one owner cannot relocate it

Moving a stack would mean cutting the shared cast-iron pipe, re-routing drainage through other owners’ ceilings or walls, and re-engineering slope for the entire column. Fla. Stat. §718.113(3) forbids a unit owner from doing anything that adversely affects the safety or soundness of the common elements — which is exactly what cutting a live soil stack does.

Where your branches are allowed to meet it

You can connect your bathroom’s branch drains to the existing stack at the point the building already provides, and a licensed plumber makes that tie-in with the correct transition coupling for cast iron. What you cannot do is demand the stack itself move two feet to suit a new shower position. Keeping the connection where it is keeps the project a private remodel rather than a building-wide alteration.

Can You Move the Plumbing in a High-Rise

Within tight limits, yes — you can shift your own branch drains a short distance inside the unit, but you cannot move the shared stack they tie into, and on a high floor there is no slab to bury new pipe in. That combination is why condo bathrooms almost always keep the toilet and shower drain within a few feet of their original rough-in.

The slab-and-ceiling problem

In a single-family Florida home on a slab-on-grade, a plumber can trench the slab to relocate a toilet flange. In a stacked condo, the floor of your bathroom is the structural ceiling of the unit below; you cannot bury drain pipe in it, and you cannot drop pipe into your neighbor’s ceiling. Any horizontal run has to fit inside your own floor or soffit build-up while still holding the drainage slope the code requires, which sharply limits how far a fixture can travel — a toilet especially, with its larger trap and flatter allowable slope.

The licensed tie-in and the stack inspection

Even an in-unit move that connects to the existing stack is a licensed plumbing operation, and many South Florida associations add a stack inspection on top of the county inspection. The building engineer may camera or pressure-test the segment your branch ties into, both to confirm the old cast iron can take the connection and to document its condition before your work touches it. A single-family bathroom never faces this second layer of review.

The honest planning rule is to treat the toilet and shower-drain locations as nearly fixed and design the vanity, the walk-in shower we install, and the storage around them. A bathroom that respects the existing rough-in is approvable; one that fights it usually is not.

Waterproofing Over an Occupied Unit

This is the requirement a generic bathroom guide skips: when there is a living unit directly below yours, the bathroom floor and shower are not just protecting your finishes — they are the only thing between your shower and the downstairs owner’s ceiling. That is why a tested, bonded waterproof membrane is mandatory, and why boards ask for proof of it.

The bonded membrane standard

The controlling specification is ANSI A118.10 — Load Bearing, Bonded, Waterproof Membranes for Thin-set Ceramic Tile and Dimension Stone Installation. A membrane that passes A118.10 is engineered to stay watertight under the tile, bonded continuously to the substrate so water cannot track sideways and find a path down into the structure. In a stacked condo it is applied across the entire wet floor and up the shower walls, turning the whole bathroom floor into a sealed pan.

What the assembly looks like in a condo bath

A leak-proof condo shower is built in layers, each doing one job:

• Sloped substrate — the pre-slope or foam tray that moves water to the drain at the code-required pitch.
• Bonded A118.10 membrane — continuous waterproofing across the floor and up the walls, tied into a compatible drain.
• Thin-set and tile — the finish surface, set over the membrane, never relied on as the waterproof layer itself.
• Sealed penetrations — the drain, valve, and any niche detailed so the membrane is unbroken.

The membrane, not the tile or the grout, is what keeps water out of the structure — tile and grout are porous and will pass moisture over time.

The flood test the inspector watches

Before tile goes on, the shower pan is flood-tested. Under the Florida Building Code, Residential P2503.6 Shower Liner Test, the drain is plugged watertight, the receptor is filled with water to a depth of not less than 2 inches measured at the threshold, and the water is held for not less than 15 minutes with no evidence of leakage. Many condo crews extend that hold overnight precisely because a slow drip into an occupied unit below is the most expensive failure in the building. Our deeper Florida wet-room waterproofing guide walks the full assembly, and our shower remodeling crews flood-test every pan before tile.

Miami-Dade Work-Hour and Renovation Rules

Beyond the permit and the board, a Miami high-rise remodel runs inside a tight envelope of work-hour, noise, and logistics rules — and breaking them is the fastest way to lose access to the building mid-project. Miami-Dade limits noisy construction near multi-family residences, and your association layers its own schedule on top.

County noise and work hours

Miami-Dade County prohibits the operation of noise-producing construction equipment near residences, including multi-family buildings, during restricted overnight hours; work that must run during those hours requires a Temporary Noise Ordinance Waiver tied to an active building permit. In practice, demolition and tile cutting in a condo happen on weekday daytime hours the association approves, not on a contractor’s preferred schedule.

Association logistics the schedule lives or dies on

The building’s own rules usually decide the real calendar. A board-ready plan accounts for each of these before the first day:

1. Approved work hours — the daytime window the association allows for noise and dust, often tighter than the county’s.
2. Freight elevator reservation — padded, booked in advance, and shared with every other unit doing work.
3. Debris and dumpster route — how demolition waste leaves the tower without using passenger elevators or common lobbies.
4. Water shut-off coordination — any stack tie-in that needs the riser isolated must be scheduled with the building engineer and noticed to neighbors.

A licensed remodeler who works in towers builds these constraints into the timeline from day one, which is what keeps a condo bathroom on schedule instead of stalled at the loading dock.

Designing the Approvable Condo Bathroom

The Miami condo bathroom that sails through both gates is the one that changes everything the owner controls and nothing the association does. That means a new vanity, toilet, walk-in shower, tile, lighting, and finishes — all on the existing fixture locations — over a tested A118.10 membrane, with no structural or shared-stack work.

The like-for-like principle

A like-for-like layout keeps the toilet, shower drain, and water connections where the building already put them, so no common element is disturbed and the permit stays in the lightest category. It is the same restraint that keeps the board review a formality and the project inside your unit boundary. A tub-to-shower conversion or a new vanity fits naturally inside it, as long as the drains do not move; our full bathroom remodeling work in towers is designed around exactly that constraint.

The contractor and insurance step

Boards almost always require your contractor’s license and liability and workers’-compensation insurance on file before approval, plus a certificate of insurance naming the association. A licensed remodeler who works in Miami towers already carries this and builds the elevator-padding, freight-loading, and work-hour rules into the schedule rather than discovering them on site.

The board-ready submittal

A clean board package speeds everything, because it answers the board’s questions before they are asked. Setting the toilet and shower at the existing stack connection keeps the plumbing scope a straightforward fixture installation rather than a relocation project.

What a board-ready package contains

A submittal that proves nothing shared is touched rarely comes back with conditions:

1. Scope letter stating the work is interior, like-for-like, and connects to — but does not move — the shared stack.
2. Simple plan showing the toilet, shower drain, and water connections staying in place.
3. Waterproofing detail naming the ANSI A118.10 membrane and the flood test over the unit below.
4. Contractor license plus a certificate of insurance naming the association.
5. Work schedule with approved hours, freight-elevator reservation, and debris route.

For the structural cousin of this question — hard floors over occupied units — South Florida’s condo flooring sound rules follow the same approve-before-you-build logic, and the kitchen version of the riser problem is covered in our condo kitchen board-approval guide.