Bathroom Remodeling in Shirley, NY

Shirley is Town of Brookhaven. A lot of what we are asked for here is a second bathroom rather than a better one, which is exactly the case where the septic question below has to be settled first.

What we see in Shirley bathrooms

More of what we are asked for in Shirley is a second bathroom rather than a better one, and that is a different project with a different first step. Adding fixtures to a house on septic is where the Suffolk County review below applies, and it has to be settled before a layout is worth drawing.

The practical advice: work out where the existing waste stack runs before deciding where the new bathroom goes. A bathroom placed near the stack is a fraction of the cost of one placed across the house from it, and that single decision moves the number more than any fixture choice.

What needs a permit in Shirley

Vanity swap, retiling, new fixtures in the same places — finish work, generally no permit. Toilet or shower drain moves, tub converts to a walk-in shower, a bathroom gets added, or a bathroom goes in a basement — permitted work, every time.

The Suffolk catch: adding a bathroom to a house on septic rather than sewer can trigger a Suffolk County Health Services review, because the system was sized for a set number of fixtures. It runs separately from the town permit, on its own timeline. Redoing an existing bathroom does not raise it. Filing detail for Town of Brookhaven Building Division.

Four things decide whether a bathroom lasts, and none of them are the tile: the subfloor, the venting on a moved toilet, the waterproofing membrane behind the tile, and where the exhaust fan actually terminates. What to ask about each. We measure on site for free and put the number in writing as a scope with a total.

Verified August 2026. Requirements and fees change and each department publishes independently. Confirm anything here with the Town of Brookhaven Building Division at (631) 451-6333 before you order materials or sign a contract. One Independence Hill, Farmingville, NY 11738.

Also serving, near Shirley

We are based in East Patchogue and work across Suffolk County. If you are inside an incorporated village, the village building department governs rather than the town.

• Patchogue
• Medford
• Islip
• Bay Shore
• Smithtown

If your town is not on the list, call anyway — the list is where we work most, not a boundary. Anything from Nassau through the Twin Forks is fair game; we tell you honestly if travel makes a small job uneconomical.

Frequently Asked Questions

Where is the cheapest place to add a bathroom?
Near the existing waste stack, and ideally backing onto an existing bathroom or the kitchen wall. The further a new bathroom sits from the stack, the more floor and wall has to open up to route the drain with proper fall and venting. That one decision changes the price more than any fixture selection.

Do I need a permit for a bathroom remodel in Shirley?
Replacing a vanity, retiling or swapping fixtures in the same locations is generally finish work and needs no building permit. Moving the toilet or shower drain, converting a tub to a walk-in shower, or adding a bathroom is permitted work. There is far more plumbing in a bathroom than a kitchen, so that line gets crossed more often.

Does adding a bathroom in Suffolk County need Health Department approval?
It can. If the house is on a septic system rather than sewer, adding a bathroom may trigger review by Suffolk County Department of Health Services, because the system was sized for a set number of bedrooms and fixtures. That review is separate from the town building permit. Redoing an existing bathroom does not raise it.

Is tile waterproof?
No. Tile is not waterproof; the membrane behind it is. Ask specifically what waterproofing goes in behind the tile, because it is the part you never see and the only part that decides whether the wall lasts.

Related Reading

• Bathroom permits by town — the full breakdown
• Bathroom remodel cost — 2026 Long Island numbers
• Walk-in showers — the conversion that needs a permit
• Septic and Suffolk projects — when SCDHS gets involved
• Bathroom remodeling in Suffolk — local considerations