If the sink stays in its exact existing location with no supply/drain changes, generally no — it's treated as a cosmetic project. If you're moving the sink even a few inches, that's plumbing work and requires a permit in all three South Florida counties.

Moisture-resistant plywood with sealed edges significantly outperforms particleboard or standard MDF, which absorb ambient bathroom humidity over time and swell or delaminate at the seams within a few years.

Quartz is non-porous and never needs sealing, making it low-maintenance in a humid bathroom. Marble is genuinely beautiful but porous, and needs resealing roughly every six to twelve months to resist moisture penetration and staining — a real ongoing commitment worth weighing against the look.

It's a bigger step up than it sounds — moving the sink location, even slightly, requires relocating supply and drain lines, which means a plumbing permit and rough-in work, unlike a same-location swap.

Recessed (in-wall) medicine cabinets and niches reclaim depth without using floor space, and drawer-based storage generally outperforms cabinet doors for organization in a small vanity — both work within the room's existing footprint.

A floating vanity opens up visible floor space and makes cleaning underneath easier, but requires blocking in the wall to support its weight, installed during rough-in. Floor-mounted vanities are simpler to install and typically offer more storage volume for the same footprint.

A same-location swap with no plumbing changes can often be completed in a few days to about a week, including countertop template and fabrication lead time. Relocating the sink adds plumbing rough-in and inspection time on top of that.

Uncoated standard hardware can corrode or discolor over time in constant bathroom humidity, especially in coastal South Florida. Specifying 316 stainless or hardware specifically rated for wet environments avoids this, for a modest cost difference.