Laundry Room Remodel Calculator
Most "laundry room cost" calculators just multiply a flat rate by square feet. This one models what actually drives the bill: floor level (2nd-floor adds drain pan and structural checks; basement adds backwater valve and floor drain), whether you're tying into existing rough-in or running new from the main stack, whether the dryer is gas or electric, and whether your panel has capacity for new circuits.
The price headline updates live as you toggle. Code callouts surface the citations that drive each scope decision: IRC P2706.1.2 standpipe rules (18–42" above the trap weir, 2" trap minimum), 2023 NEC 210.8(A)(10) GFCI for both 120V and 240V laundry receptacles, IRC M1502.4.6.1 dryer vent length math (35-ft max, −5 ft per 90° elbow), and IRC G2419.4 sediment-trap EXEMPTION for dryers. State amendments noted where they matter (MA bans AAVs, several states amend out 240V dryer GFCI).
Three corrections to common misconceptions are baked in: (1) drain pan is NOT mandated for washers by 2021 IRC — that section covers water heaters; pans are mfr/AHJ-driven; (2) sediment trap on gas dryers is exempt per IRC G2419.4; (3) dryer transition duct is permitted up to 8 ft per 2021 IRC M1502.4.3, not 4 ft as older references state. The materials preview pulls drywall, paint, flooring, trim, and door quantities from the existing single-trade calculators; plumbing, electrical, and dryer-vent line items are emitted by the composer with full spec references.
Laundry Room Remodel Estimator
Pick typology, finish, and floor level. Toggle plumbing / electrical adders. Price range updates instantly — every code citation explained.
National range, materials + labor
How this estimate is built
National ranges, materials + labor combined. Excludes mold / asbestos remediation, structural floor reinforcement, exterior trenching, washer / dryer appliance purchase, and luxury cabinetry.
Ranges are intentionally wide because laundry project cost depends on floor level, existing rough-in proximity, panel capacity, and code-driven additions (backwater valve, drain pan, GFCI). Use the Likely number as a planning anchor, not a quote.
For a detailed materials take-off (drywall, paint, flooring, trim, doors), see the drywall, paint, flooring, trim, and interior doors calculators.
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Related Code Guides
Building code, climate zone, and standards references that change defaults for this calculator.
Climate Zone 4: R-Value Requirements (2021 IECC)
Mixed-humid Climate Zone 4 R-value minimums for the Mid-Atlantic, Ohio Valley, Kentucky, Tennessee, and northern Texas under the 2021 IECC.
Climate Zone 5: R-Value Requirements (2021 IECC)
Cool Climate Zone 5 R-value minimums for Pennsylvania, New York, Michigan, Illinois, Iowa, and the Pacific Northwest interior under the 2021 IECC.
Climate Zone 6: R-Value Requirements (2021 IECC)
Cold Climate Zone 6 R-value minimums for Minnesota, Wisconsin, Maine, Vermont, Montana, and North Dakota under the 2021 IECC.
Climate Zone 7: R-Value Requirements (2021 IECC)
Very-cold Climate Zone 7 R-value minimums for northern Minnesota, North Dakota, and high-altitude pockets of Alaska under the 2021 IECC.
California Title 24 Part 6: Envelope Requirements
California Title 24 Part 6 envelope, cool-roof, and prescriptive insulation requirements by climate zone for residential — 2025 cycle effective Jan 1, 2026.
Massachusetts Stretch Energy Code
Massachusetts Stretch Energy Code envelope, HERS, and electrification requirements for residential construction in opt-in municipalities.
How to Use This Calculator
- Pick typology: Closet (30"–60" wide stacked or side-by-side bay), Small (5×6 to 6×8 dedicated room), Full (8×10 to 12×12 with counter and uppers), or Laundry/Mudroom combo (with bench and cubbies).
- Pick finish quality: Budget (sheet vinyl, builder cabinets), Mid-range (LVP or tile, semi-custom), or High-end (porcelain + Ditra, custom millwork, smart leak system).
- Pick floor level: 1st floor (baseline), 2nd floor / above conditioned space (auto-recommends drain pan + flags IRC R301.7 deflection), or Basement (auto-flags floor drain + trap primer + backwater valve).
- Pick region: lower-cost metro, national average, or high-cost metro (NYC, SF Bay, Boston, LA, Seattle, DC).
- Toggle plumbing adders: new DWV rough-in from main stack, utility sink, drain pan, smart leak detection, basement backwater valve.
- Toggle electrical adders: new 240V dryer circuit, gas vs electric dryer, panel upgrade to 200A. Each shows its $ delta.
- Open the Code callouts panel to see which IRC / NEC / IFGC clauses your scope triggers — standpipe height, trap size, GFCI rules, dryer vent length math, CSST bonding, sediment-trap exemption, hose-thread vacuum breaker.
- Open the materials preview to see the rough take-off: drywall, paint, floor, trim, doors (from underlying calcs), plus plumbing supply LF, fittings, washer box, DWV pipe, electrical wire by gauge, breakers and receptacles, and the full dryer-vent kit.
- Save, share, or copy the estimate. URL state is encoded so a shared link rebuilds the exact configuration on the other end.
Three corrections to the common laundry-spec misconceptions
First: drain pans are NOT mandated for washers by 2021 IRC. The IRC sections often cited (P2801.6 / IPC 504.7) govern water-heater pans, not washing-machine pans. Pan requirements for washers come from appliance manufacturer install instructions, local code amendments (notably CA, FL, NY and many AHJs above conditioned space), and IBC §708/§717 acoustic and water-damage provisions in multi-family. Treat the pan as "code-driven where above conditioned space" only by local rule, not by model IRC. Second: sediment traps are EXPLICITLY EXEMPT for clothes dryers per IRC G2419.4 / IFGC 408.4 (along with ranges, illuminating appliances, decorative vented appliances, gas fireplaces, and outdoor grills). The shut-off valve and listed appliance connector are still required. Third: dryer transition duct is permitted up to 8 ft single length per 2021 IRC M1502.4.3 — not 4 ft as older references and some manufacturer cards still claim. Older code editions and some manufacturers cap at 6 ft. The calculator surfaces all three corrections inline in the Code callouts panel.
Frequently Asked Questions
How much does a laundry room remodel cost?
Per 2024–2025 Angi / HomeAdvisor / Forbes Home / Remodeling Magazine medians, a full laundry room remodel runs roughly $11,000–$28,000 nationally (mid-tier finish, no plumbing relocation). A closet-laundry conversion drops to $4,500–$11,000; a small dedicated room is $7,500–$17,000; a 2nd-floor laundry add — most expensive scenario because of drain pan, structural deflection, and longer vent runs — runs $13,000–$42,000. Adding new plumbing rough-in from the main stack adds 12–25% to the base; a panel upgrade to 200A adds another 20–45%. The calculator updates the range live as you toggle each adder.
Do I need a drain pan for a second-floor laundry?
The 2021 IRC does NOT mandate a drain pan for washers — IRC P2801.6 / IPC 504.7 govern water-heater pans, not washing machines. However, most appliance manufacturers (Whirlpool, LG, Samsung) RECOMMEND one above conditioned space, and many AHJs (notably CA, FL, much of NY, MA) REQUIRE one by local amendment. The standard install is a galvanized-steel or HDPE pan (30×30 typical) with a 1-inch pan drain piped to an indirect waste (floor drain, hub drain, or exterior) — never directly into the DWV system. Cost: $250–$500 material + $250–$750 labor.
How long can a dryer vent run be?
Per IRC M1502.4.6.1 (2021), max 35 ft of 4-inch rigid metal duct from the transition-duct connection to the outlet terminal, reduced by 5 ft per 90° elbow and 2.5 ft per 45° elbow. Manufacturer instructions supersede if more permissive — high-static-blower dryers (LG WM6500, Samsung WF53) often allow 50–65 ft equivalent. The transition duct (UL 2158A flex) can be up to 8 ft single length per 2021 IRC M1502.4.3 (corrects older 4-ft references). Foil tape only — sheet-metal screws snag lint and are prohibited from protruding more than 1/8 inch into the duct interior.
Do I need a permit to add or move my washing machine?
Yes in almost every jurisdiction if you're modifying water supply, drain, or vent — plumbing permits are nearly universal for any new rough-in. A like-for-like fixture swap with no piping change is typically exempt. Electrical permit is required if you're adding or relocating the 240V dryer circuit. Gas-line work for a gas dryer almost always requires a permit AND a licensed gas-fitter. Mechanical permits often required for the dryer vent termination. Permit fees range $75–$1,300+ depending on AHJ and combined trade scope.
Can I use an air admittance valve instead of venting through the roof?
Depends on state. IRC P3114 / IPC 918 permit AAVs (per ASSE 1051) subject to install rules. But Massachusetts prohibits AAVs except by special permission from the Board of State Examiners of Plumbers and Gas Fitters; Chicago generally prohibits them; California allows per CPC §911 but with AHJ-by-AHJ variation; NYC §27 plumbing code is restrictive. At least one open atmospheric vent through the roof is required for any drainage system regardless of whether AAVs are used at branch fixtures. The calculator's code callouts flag AAV state restrictions.
What size electrical circuit does my dryer need?
Electric dryer: 30A 240V dedicated, 2-pole breaker, 10/3 NM-B with ground (10 AWG copper for hots, neutral, and ground), terminating at a NEMA 14-30 4-wire receptacle per NEC 250.140. 3-wire NEMA 10-30 is grandfathered for existing only — all new installs are 4-wire. Gas dryer: just a standard 20A 120V circuit (often shared on the dedicated laundry circuit). Under 2023 NEC 210.8(A)(10), the 240V dryer receptacle requires GFCI protection — but several states (TX, OH, KY) have amended that requirement out due to nuisance tripping. Verify your AHJ's NEC adoption cycle.
Can I share the washer circuit with a gas dryer?
Yes. NEC 210.11(C)(2) requires at least one 20A circuit dedicated to laundry-area receptacles with 'no other outlets' outside the laundry area. But multiple receptacles WITHIN the laundry area — washer, gas dryer's 120V ignition outlet, and convenience receptacles — can share that one 20A circuit. The 20A laundry circuit also needs AFCI protection per NEC 210.12 and GFCI per 210.8(A)(10). Most modern installs use a dual-function AFCI/GFCI breaker.
Do I need a sediment trap on a gas dryer line?
No. Clothes dryers are EXPLICITLY EXEMPT from the sediment-trap requirement per IRC G2419.4 / IFGC 408.4 — along with ranges, illuminating appliances, decorative vented appliances, gas fireplaces, and outdoor grills. The shut-off valve at the appliance (full-port ball valve per IRC G2420.5) and a listed flexible appliance connector (ANSI Z21.69, 6 ft max, not concealed) are still required. Some local inspectors call for a sediment trap anyway out of habit — verify with your AHJ before omitting it.
How tall should the washing machine standpipe be?
Between 18 and 42 inches measured above the trap weir, per IRC P2706.1.2 (2021). The trap is 2-inch minimum per IRC Table P3201.7, and must be a P-trap — S-traps are prohibited (and explicitly banned in MA, MN, and most AHJs). If a laundry tray waste line ties into the standpipe, the standpipe must be at least 30 inches above the trap weir AND above the tray's flood-level rim per IRC P2706.1.2.1, with the tray outlet within 30 inches horizontal of the standpipe trap. Branch line is 2-inch minimum (DFU = 2 for a washer per Table P3005.4.1).
Do I need a floor drain in a basement laundry?
Most AHJs require a floor drain for basement laundries as flood protection even though the 2021 IRC doesn't universally mandate one for residential basements. If you install one, IPC 1002.4 requires a trap primer when the drain is subject to infrequent use — without it the trap dries out and sewer gas enters the room. Common spec is a 2-inch trap with integral backwater (Sioux Chief 802 or similar) plus a PPP or Sioux Chief mini-primer. Additionally, per IRC P3008.1, if any basement fixture's flood-level rim is below the next upstream manhole cover, a backwater valve is required on the building drain or branch.
Does CSST gas piping need to be bonded?
Yes. Per IRC G2411.2 / IFGC 310.2, any gas piping system containing CSST (Gastite, TracPipe, etc.) must be electrically continuous and directly bonded to the electrical service grounding electrode system with a copper jumper at least 6 AWG, attached to a rigid pipe section or brass CSST fitting — not to the CSST tubing itself. Jumper length is limited to 75 ft. Listed conductive-jacket CSST (Counterstrike, FlashShield, etc.) is exempt per G2411.3 when connected to a bonded appliance branch circuit. Bonding is typically done by a licensed electrician in MA, NY, and other states that require sign-off.
Can I put the washer above the living room?
Subject to local code. Most AHJs allow it but want a drain pan with a piped pan drain to indirect waste or exterior. Floor framing must meet IRC R301.7 deflection limits (L/360 live load), and high-spin HE front-loaders (1,200+ RPM) may require sister joists if span exceeds ~12 ft. NYC has additional restrictions in multi-family — verify with NYC DOB §27 plumbing code and any co-op / condo board bylaws. Smart leak detection (Moen Flo, Phyn Plus) and auto-shutoff valves (FloodStop, WaterCop) are inexpensive insurance for second-floor installs.
Do I need an exhaust fan in the laundry room?
For dwellings built under IRC M1505 / IECC R403.6 / ASHRAE 62.2 ventilation rules, yes — 50 CFM intermittent or 20 CFM continuous local exhaust. Most jurisdictions extend the bathroom-style requirement to laundry rooms. The dryer exhaust does not satisfy this; it's a separate system per IRC M1502.2 and exhausts the dryer's air only. Common exhaust-fan picks: Panasonic WhisperGreen FV-0511VQ1 series or Broan AE110 — both quiet, Energy Star rated, and meet the 50 CFM minimum.