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FL Plumbing Rough-In Height Standards Calculator

Sinks · Tubs · Toilets · Showers · FPC 2023 compliance · ADA vs. standard · All fixture types · FL licensed plumbing rough-in guide

FPC 2023 · Florida Building Code · ADA Standards · All 67 FL Counties
🔧Fixture Rough-In Calculator
Select your fixture type and options to get precise rough-in dimensions per Florida Plumbing Code 2023 and Florida Building Code. All heights measured from finished floor (AFF) unless noted.
📏Quick Reference — Most Common FL Rough-Ins
Standard residential, measured from finished floor (AFF) or as noted.
🚽 Toilet (Gravity Tank)
Closet flange height (slab)
0"–1/4" AFF
Flange to finished floor
1/4" max above
Supply line rough-in
6" to left, 7" AFF
Drain centerline to wall
12" (std) / 10" or 14"
Side clearance (FL code)
15" to CL from wall/ob
Front clearance (FL code)
21" min from front
🚿 Walk-In Shower Valve
Mixing valve centerline
48" AFF (std)
Showerhead stub-out
78"–80" AFF
Hot supply to valve
4" left of CL
Cold supply to valve
4" right of CL
Drain to back wall
Varies by base
Min shower floor size
30"×30" (FPC)
🛁 Bathtub
Overflow centerline
16"–18" AFF (floor)
Drain rough-in
Per tub spec sheet
Faucet valve stub-outs
28"–32" AFF
Supply line spacing
8" c-c (hot left)
Showerhead (over tub)
75"–78" AFF
Drain offset (standard)
See drain rough-in
🚰 Lavatory / Vanity Sink
Drain centerline (standard)
18"–20" AFF
Supply stub-outs
21"–22" AFF
Supply spacing (c-c)
8" (hot left)
Drain to back wall
12"–15" AFF (standard)
ADA drain height
17" AFF max
ADA supply height
18"–20" AFF
⚠️Florida-Specific Rough-In Code Notes
FL Plumbing Code edition currently adoptedFPC 2023 (6th Edition)
Toilet flange must be flush with or above finished floorFPC §405.4.1
Shower valve must be pressure-balancing or thermostaticFPC §424.3
Max temperature at shower valve — scald protection120°F (FPC §424.3)
Min shower enclosure size (finished floor area)900 sq in / 30"×30" (FPC §408.6)
Vent required within — lavatory trap arm5 ft of trap (FPC §909)
P-trap seal depth requirement2"–4" water seal (FPC §1002)
Hot water left-hand rule — all FL fixturesHot on left, cold on right (FPC §607.2)
FL permit required for rough-in changes?Yes — all rough-in plumbing requires FL permit
♿ADA vs. Standard Rough-In Comparison
ADA requirements under 2010 ADA Standards for Accessible Design apply to commercial buildings and any residential units designated as accessible. FL Fair Housing requires accessible design in multi-family housing (4+ units). Many FL homeowners choose ADA heights for aging-in-place design.
FL Aging-in-Place Trend: With Florida's large retiree population, many residential clients request ADA-compliant rough-in heights even when not legally required. Planning accessible heights at rough-in costs nothing extra — retrofitting later costs $800–$3,500 per fixture.
🚽Toilet ADA §604
StandardADA
Seat height (finished)14"–16"17"–19"
Toilet centerline from side wall12"–18"18" exactly
Clear floor space in front of toilet21" min60" wide × 56" depth
Grab bar — rear wallNot required33"–36" AFF
Grab bar — side wall (from rear wall)Not required6" max from rear; 54" from wall
Flush control sideEither sideOpen (non-wall) side
Tissue dispenser heightAny7"–9" forward of front edge, 19" AFF
Drain rough-in (typically unchanged)12" from wall12" from wall (same)
Supply rough-in height7" AFF7" AFF (same)
🚰Lavatory / Vanity Sink ADA §606
StandardADA
Sink rim / counter height (finished)32"–36" AFF34" max AFF
Drain centerline height AFF18"–20"17" max
Supply stub-out height AFF21"–22"18"–20"
Clear knee space below (depth)Not required11" at 9" AFF, 8" at 27" AFF
Clear floor space (forward approach)Not required30"×48" centered
Pipe insulation required (drain/supply)OptionalRequired — protect knees
Faucet — maximum reach to operateAnyMax 11" from front edge
Faucet — operable partsAny typeLever, push, touchless (not round knob)
🚿Shower ADA §608
StandardADA
Shower size (minimum)30"×30"36"×36" transfer / 30"×60" roll-in
Shower threshold / curb heightUp to 4" curb1/2" max for transfer; 0" for roll-in
Control valve height (mixing valve)48" AFF (typical)38"–48" AFF (within reach range)
Showerhead height78"–80" AFF48" AFF (handheld) — also at 78" fixed
Handheld showerhead required?OptionalRequired; 59" hose minimum
Seat requirementOptionalRequired (fold-down or built-in)
Grab bar — control wallOptional33"–36" AFF horizontal
Grab bar — back wallOptional33"–36" AFF horizontal
Controls — accessible from entry?Not requiredReachable without entering spray
🛁Bathtub ADA §607
StandardADA
Tub rim height (finished)15"–18" AFF17" max (preferred for transfer)
Clear floor space (side of tub)Not required30" wide × 60" long (alongside tub)
Faucet controls locationCenter of tub wallBetween 33"–36" AFF, at foot end
Showerhead (over tub) — handheldOptionalRequired; 59" hose min
Grab bar — back wall (horizontal)OptionalTwo rails at 8"–10" AFF and 33"–36" AFF
Grab bar — foot endOptionalAt tub foot end, same heights
Seat (at head end)OptionalRequired — permanent or fold-down
🏗️FL Fair Housing / ADA Applicability
Single-family home (owner-occupied)ADA not required (optional)
Multi-family 4+ units (ground-floor or elevator) — FL Fair HousingAccessible design required
Commercial — places of public accommodationFull ADA required
Rental single-family (any # of units)FL Fair Housing applies to 4+ units
FL state and local government buildingsFull ADA + FL ADA required
Renovation vs. new construction — ADA triggerNew = full compliance; reno = path of travel
🏠Rough-In Standards by Room — FL Residential
All measurements from finished floor (AFF) unless noted. Standard residential, no ADA unless marked.
🚽Master Bathroom / Full Bath
Toilet drain — floor penetration centerline to finished wall (standard)12"
Toilet supply — height AFF, 6" left of drain CL7" AFF
Lavatory drain — height AFF (standard)18"–20" AFF
Lavatory supply stub-outs — height AFF21"–22" AFF
Lavatory supply spacing (center to center)8" c-c (hot L, cold R)
Tub faucet stub-outs — height AFF28"–32" AFF
Tub/shower showerhead stub-out — AFF75"–78" AFF
Shower valve mixing valve — AFF48" AFF
Shower showerhead stub-out — AFF78"–80" AFF
Shower supply spacing (c-c) to valve8" c-c (hot L, cold R)
Toilet side clearance — CL to wall/obstacle15" min (FPC)
Toilet front clearance — CL to front21" min (FPC)
🍳Kitchen
Kitchen sink drain — height AFF18"–20" AFF (to drain CL)
Kitchen sink supply stub-outs — AFF20"–22" AFF
Kitchen supply spacing (c-c)8" c-c (hot L, cold R)
Dishwasher drain (high loop) — min height20" AFF min loop
Dishwasher supply line — size3/8" compression from shut-off
Refrigerator ice maker — supply rough-in6"–12" AFF, behind fridge
Gas line (if applicable) — AFF6"–12" AFF, behind range
👕Laundry Room
Washing machine standpipe height — AFF36"–42" AFF
Standpipe minimum trap-to-top distance18" min (trap arm below)
Washer supply stub-outs — AFF40"–48" AFF
Washer supply spacing (c-c)8" c-c (hot L, cold R)
Slop sink drain — AFF12"–14" AFF
Slop sink supply — AFF36"–40" AFF
Dryer gas stub-out (if applicable)6"–8" AFF, behind unit
💧Water Heater / Mechanical
Water heater drain valve — AFF3"–4" AFF (tank bottom)
T&P valve discharge — relief valve heightPer mfr; drain within 6" of floor
Cold water supply inlet — AFFTop of water heater
Hot water outlet — AFFTop of water heater
Water heater seismic strapping (FL — slab)Not required in FL (no seismic zone)
Expansion tank (FL — closed system requirement)Required with backflow preventer
Gas WH — sediment trap AFFRequired; within 12" of WH
📝FL Plumbing Code Toilet Clearance Minimums
FL Building Code §2904 establishes minimum toilet compartment clearances. Many FL municipalities enforce stricter clearances — check local amendments before rough-in.
Min side clearance — toilet CL to wall15" (FPC); 18" (ADA)
Min side clearance — toilet CL to tub/shower15"
Min clearance — front of toilet bowl21" (FPC); 60" clear (ADA)
Minimum bathroom doorway width (FL code)24" clear (28" door); 32" ADA
Lavatory — min clearance from toilet CL (side)15" from toilet CL
Shower — min clear floor space inside900 sq in (30"×30" min)
📋Request Rough-In Plumbing Quote
New construction rough-in, remodel rough-in changes, ADA retrofit, or inspection fail corrections — we handle all FL plumbing rough-in work under a licensed FL master plumber. Permitted and inspected.
✅ Our Rough-In Services:
• New construction rough-in — all fixtures
• Remodel rough-in — bathroom, kitchen, laundry
• ADA accessible design rough-in
• Toilet flange reset / height correction
• Shower valve relocation
• Failed inspection corrections
• Rough-in plan review and layout consultation
• FL plumbing permit pull and inspection
⚡Plumbing Inspection Support
Failed a rough-in inspection? We diagnose and correct same-day in most FL counties. Call for immediate support.
(561) 316-7450
Licensed FL Master Plumber · Permitted Work · All FL Counties