Dual-Flush Conversion Estimator
A dual-flush toilet gives you two flush volumes - a reduced flush for liquids and a full flush for solids - so the average flush uses less water. You can get there two ways: a conversion kit that replaces the flush valve / flapper in an existing tank with a two-button valve, or a new dual-flush toilet (often a WaterSense 1.28 / 1.0 gpf model). On a sound ~1.6 gpf toilet a kit is quick and cheap; an older 3.5+ gpf toilet, a one-piece, or a wall-hung concealed tank takes more work, and a new WaterSense fixture delivers the biggest savings. Cost drivers are the approach, the existing toilet, any shutoff / re-set work, and add-ons like haul-away or a flange repair.
A dual-flush toilet has two flush options - a reduced flush (commonly around 1.0 gallon) for liquids and a full flush for solids - so the average flush uses less water than a single-volume toilet. A conversion kit gives an existing toilet that capability by swapping the flush valve / flapper for a two-button valve.
Two Ways To Get There
You either retrofit the existing tank with a kit, or you replace the toilet with a factory dual-flush model. The right path depends on the toilet you have and how much water you want to save.
A conversion kit is the low-cost route: it reuses your bowl and tank and just changes how the tank releases water. It shines on a sound, modern ~1.6 gpf toilet.
When To Replace Instead
If the toilet is an older 3.5+ gpf water hog, has a worn or proprietary valve, or you want certified performance, a new WaterSense dual-flush toilet usually makes more sense - it locks in low flush volumes and a clean-flushing bowl, where a kit on an old bowl can sometimes need a double flush that erodes the savings.
Florida households flush a lot, and water and sewer rates in many FL utilities make toilet water use worth trimming - the toilet is one of the largest indoor water users in a home.
Hard Water Note
Florida's hard water can leave mineral scale on flapper seats and two-button valve seals, so we pick quality kit components and check the seal. Many FL water providers also run rebate or conservation programs for high-efficiency toilets - worth checking before you buy.
Most standard two-piece gravity toilets accept a common dual-flush conversion kit. Fit gets trickier with some one-piece toilets, pressure-assist tanks, and especially wall-hung / concealed-tank toilets that use a proprietary in-wall valve.
What We Check
We confirm the tank type, the existing valve, the rough-in, and whether the bowl flushes well at a reduced volume. If a kit will not perform on your bowl, we will say so and price a WaterSense replacement instead.
The federal standard caps most toilets at 1.6 gpf, and WaterSense-labeled high-efficiency toilets use 1.28 gpf or less while still passing flush-performance testing; many dual-flush models average around 1.0-1.28 gpf.
Rebates
Several Florida water providers offer rebates for replacing old high-volume toilets with WaterSense models. We can point you to the program; eligibility and amounts are set by your provider, so confirm before purchase.
Best Time: During Any Bathroom Work
A conversion takes minutes, but it is efficient to do it alongside other bathroom work or when a toilet is already being serviced.
Typical Install
1. Shut off the supply and drain the tank. 2. Remove the old flush valve / flapper. 3. Install the two-button dual-flush valve and set the liquid and solid volumes. 4. Reconnect, refill, and adjust the fill level. 5. Test both flushes for a clean, single-flush clear. 6. Check for leaks at the tank-to-bowl gasket and supply.
FL Gotchas
Forcing a kit onto a bowl that needs a double flush, a mismatched valve seal that runs, not re-setting the fill level, and ignoring a loose closet flange while the toilet is off.
A dual-flush valve has a larger seal than a basic flapper, and a running toilet quietly wastes far more water than the conversion saves - so a good seal matters.
Routine Care
Check that both buttons return and seal, watch for phantom refills (a sign of a leaking seal), and clean mineral scale off the seat. Replace the seal if it hardens. Keep the fill level at the marked line.
Warning Signs
Water trickling into the bowl, a tank that refills on its own, a button that sticks, or needing two flushes all mean it is time to service the valve.
This is the conversion or toilet swap plus professional labor in the FL market. These are planning estimates.
Approach & Toilet
A kit on a sound ~1.6 gpf two-piece toilet is the low end; a new WaterSense fixture, a wall-hung concealed tank, or multiple toilets is the high end.
Add-ons
A new angle stop, re-setting the toilet with a fresh wax ring, haul-away of the old toilet, and a minor flange repair each add. Use the calculator to combine the approach, the existing toilet, shutoff / supply work, and add-ons.
FL Permit Requirements
- Installing a dual-flush conversion kit in an existing toilet
- Swapping a flush valve / flapper for a two-button valve
- Like-for-like replacement of a toilet (verify locally)
- Moving the toilet or altering the closet flange / drain location
- Wall-hung / in-wall carrier or concealed-tank changes
- New supply or drain rough-in for a relocated toilet
- Commercial / multi-family fixture changes at scale
FL County Permit Fee Reference
Installing a dual-flush conversion kit or swapping a flush valve in an existing toilet is usually minor work. A straight like-for-like toilet replacement is often minor as well, while relocating a toilet, altering the flange or drain, or wall-hung carrier work is regulated and may be permitted. Fees and timelines are approximate — verify with your local building department / AHJ before starting work.
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FL Code References
Who Can Pull a Permit in FL?
A dual-flush conversion is light work, but it still touches a regulated fixture. Installing a conversion kit or swapping the flush valve in an existing toilet is usually minor, and a like-for-like toilet replacement is often minor too. Relocating the toilet, altering the closet flange or drain, or wall-hung carrier / concealed-tank work ties into the building drainage and supply and follows the adopted Florida Building Code (Plumbing), WaterSense flush-volume expectations, the manufacturer's instructions, local amendments, and the AHJ. Per FL Statute 489.105, regulated plumbing work is performed by the appropriate licensed contractor.
Verify any contractor's license at myfloridalicense.com and confirm requirements with your local building department before work begins.
Get a Free Dual-Flush Conversion Estimate
Licensed FL Contractor - Water-Saving Toilet Conversions & Upgrades
We convert existing toilets to dual-flush with a two-button valve kit, or replace tired high-volume toilets with WaterSense 1.28 / 1.0 gpf dual-flush models — and handle the shutoff, supply, re-set, and haul-away so you cut water use without leaks or a rocking toilet.