Plumbing Cost Calculator

Estimate a plumbing job by fixture count and scope: rough-in and trim, a repipe, a bathroom addition or a single swap, with typical 2026 US labor and material ranges.

By CalcBuilt Editorial TeamUpdated September 9, 2026Formulas checked against manufacturer specs, see how we calculate.

Quick answer: To budget plumbing, multiply the fixture count by a typical installed range per fixture, then add for stories and access. A 4 fixture bathroom addition in PEX runs about $3,600 to $8,800 installed, or $900 to $2,200 per fixture.

Your measurements

Plan view from above: area is length times width.

Job typeRepipe is priced by house area because the walls, ceilings and patching set the labor. Everything else is priced per fixture.Fixtures in the jobA fixture is anything that gets a connection: a toilet, a lavatory, a tub or shower, a kitchen sink, a laundry box, a hose bib, a water heater. A full bath is 3.House area for a repipesq ftConditioned floor area of the whole house. Only used for the repipe job type, where the price is per square foot rather than per fixture.Pipe materialPEX is the baseline. Copper runs about 1.5 to 2 times the installed cost because the material costs more and every joint is soldered or pressed.Stories the work coversEach story above the first adds stack work, longer runs and more ceiling openings. The calculator adds 15 percent per extra story.Access difficulty (percent added)%Open framing is 0. A crawlspace adds about 15 percent, a post-tension or on-grade slab about 35 percent because lines get rerouted overhead or the slab gets cut.Plumber hourly rate (optional)$Typically $75 to $200 per hour in 2026 US markets, higher for emergency calls. Only used to show what the labor half of the estimate implies in hours.

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Results

Total installed: $3,600 to $8,800; 4 fixtures at $900 to $2,200 each in PEX
Labor share: $2,160 to $6,160; Labor is typically 60 to 70 percent of an installed plumbing price
Material share: $1,440 to $2,640; Pipe, fittings, valves, hangers and the fixture connections in PEX. Fixtures themselves are bought separately
Per fixture: $900 to $2,200; New drain, vent and supply into an existing house, plus the wall and floor openings
Planning estimate: Get three bids; Permit and inspection fees are not in this number, and a plumbing permit is required in nearly every jurisdiction (IRC R105.2 does not exempt it)

Plumbing Cost formula

Per fixture jobs: Total = Fixtures x Rate per fixture x Material factor x Story factor x Access factor
Repipe: Total = House area (sq ft) x Rate per sq ft x Story factor x Access factor
Story factor = 1 + 0.15 x (Stories - 1);  Access factor = 1 + Access percent
Labor is typically 60 to 70 percent of the installed total

Worked example

A 1,600 sq ft single story house on a slab, repiped in PEX. The base range is 1,600 x $4 to 1,600 x $10, which is $6,400 to $16,000. One story means no story factor, and the slab adds 35 percent, so the range becomes $8,640 to $21,600.

Split that at 60 to 70 percent labor and the plumber's time is about $5,200 to $15,100, with $3,400 to $6,500 in pipe, fittings, manifolds and valves. At $120 per hour the labor half is roughly 43 to 126 hours, which is why a repipe quote spreads so widely: the drywall openings and the patching are what separate the low bid from the high one.

Quick reference

Typical 2026 US installed ranges before story and access factors
Job	Basis	Typical range
New rough-in and trim	Per fixture, open framing	$600 to $1,500
Bathroom addition	Per fixture, existing house	$900 to $2,200
Kitchen remodel	Per fixture	$700 to $1,800
Single fixture swap	Per fixture, same location	$350 to $900
Whole-house repipe, PEX	Per sq ft of house	$4 to $10
Whole-house repipe, copper	Per sq ft of house	$7 to $18

What a plumber is actually pricing

Almost every residential plumbing quote is built from fixture count, not from hours. A fixture is anything that needs a connection: each toilet, lavatory, tub, shower, kitchen sink, laundry box, hose bib and water heater. The plumber prices the drain, the vent, the hot and cold supply and the trim for each one, then adjusts for how hard the house makes it.

The adjustments are where quotes separate. A second story adds stack work and longer runs. A slab foundation means lines get rerouted overhead or the slab gets saw cut. Cast iron drain removal doubles demolition. None of that shows in a per fixture number, which is why two honest bids on the same house can be 60 percent apart.

Reading and comparing bids

Ask every bidder the same three questions: who opens the walls, who closes them, and who pulls the permit. A bid that leaves open drywall is not comparable to one that patches and textures. Get the permit line stated in dollars, since fees vary by jurisdiction and some cities charge per fixture.

Then look at the schedule. Plumbing happens twice: rough-in before insulation and drywall, and trim after the finishes. The inspection sits between them, and the drywall crew cannot start until it passes. A bid that does not name those two visits and the inspection between them has not thought through the job.

What this calculator leaves out

The fixtures themselves, which a homeowner usually buys, and the permit and inspection fees, which vary by city and are sometimes charged per fixture. It also leaves out drywall patching and texture where the plumber does not do it, the water heater or softener if the job changes them, gas line work, sewer lateral replacement outside the foundation, and anything the inspector finds that was wrong before this job started.

Code limits that apply

IRC R105.2
Plumbing work is not on the exempt list, so it needs a permit and inspections
If you miss it: Covered rough-in gets opened for inspection, and unpermitted work surfaces at resale
IPC 312.2
Drain and vent rough-in tested with 10 ft of water head, or an air test at 5 psi
If you miss it: A joint that only leaks under load is found after the drywall is up
IPC 312.5
Water supply tested at the working pressure, held while the inspector looks
If you miss it: A crimp missed on a PEX line floods the wall the first time the system is charged
IPC 502.1
Water heaters stay accessible for inspection, service and replacement
If you miss it: A heater boxed into a closet with no clearance has to be rebuilt to be replaced
IPC 504.7
A pan with a drain under any heater where a leak would damage the building
If you miss it: An attic or upstairs closet heater fails at year 12 and comes through the ceiling below
IPC 604.8
Static supply pressure over 80 psi needs a pressure reducing valve
If you miss it: Supply hoses and fill valves fail early, and the heater relief valve weeps

Provision	Limit	If you miss it
IRC R105.2	Plumbing work is not on the exempt list, so it needs a permit and inspections	Covered rough-in gets opened for inspection, and unpermitted work surfaces at resale
IPC 312.2	Drain and vent rough-in tested with 10 ft of water head, or an air test at 5 psi	A joint that only leaks under load is found after the drywall is up
IPC 312.5	Water supply tested at the working pressure, held while the inspector looks	A crimp missed on a PEX line floods the wall the first time the system is charged
IPC 502.1	Water heaters stay accessible for inspection, service and replacement	A heater boxed into a closet with no clearance has to be rebuilt to be replaced
IPC 504.7	A pan with a drain under any heater where a leak would damage the building	An attic or upstairs closet heater fails at year 12 and comes through the ceiling below
IPC 604.8	Static supply pressure over 80 psi needs a pressure reducing valve	Supply hoses and fill valves fail early, and the heater relief valve weeps

Rows marked checked produce a warning in the results when an entry crosses the limit. The others are on the plans or on site and this calculator does not test them. Local amendments can be stricter; the adopted edition and the inspector govern.

Mistakes that cost money

Comparing bids that do not include the same patching: one plumber leaves open drywall, another closes and textures it.
Forgetting the permit. Plumbing is not on the IRC R105.2 exempt list, and an uninspected rough-in gets opened back up.
Cast iron in an older house doubles the demolition time and the debris haul; get it identified before the bid, not after.
A slab house priced as if it were a crawlspace: rerouting overhead through the attic is a different job from crawling under joists.
Buying fixtures yourself and expecting the plumber to warrant them; most warrant only what they supply.
Scheduling drywall before the inspector signs the rough-in, which is how a wall gets opened twice.

Key facts

Labor is typically 60 to 70 percent of an installed plumbing price; the pipe and fittings are the smaller half.
A whole-house PEX repipe typically runs $4 to $10 per square foot in 2026 US markets, with copper roughly 1.5 to 2 times that.
Rough-in plus trim for a new fixture typically runs $600 to $1,500 on open framing and $900 to $2,200 when it goes into an existing house.
A water heater swap in the same location typically runs $1,200 to $2,500 installed, more where a gas line or a pan and drain have to be added.
IPC 312 requires the drain and vent rough-in to hold a water test at 10 ft of head, or an air test, before it is covered.

Frequently asked questions

How much does it cost to plumb a house?

New construction rough-in and trim typically runs $600 to $1,500 per fixture on open framing in 2026 US markets. A 12 fixture house lands roughly $7,000 to $18,000 before the fixtures themselves, permits and any access difficulty.

What does a whole-house repipe cost?

Typically $4 to $10 per square foot in PEX and $7 to $18 in copper. A 1,800 sq ft house is roughly $7,200 to $18,000 in PEX before access. A slab foundation adds about 35 percent because the lines get rerouted overhead.

Is PEX or copper cheaper to install?

PEX, by a wide margin. The material costs less and the joints are crimped rather than soldered, so the labor is faster. Copper installs typically run 1.5 to 2 times a PEX install for the same house.

Do I need a permit to replace plumbing?

In nearly every jurisdiction, yes. IRC R105.2 lists work exempt from permits and plumbing rough-in is not on it. A repipe, a bathroom addition and a relocated drain all get permitted and inspected before they are covered.

Sources and references

Next steps for this project

The usual order for a electrical & plumbing project. See all electrical & plumbing calculators.

Results are estimates based on standard formulas and typical product specifications. Confirm quantities with your supplier and local code before ordering.