House Repiping Cost Calculator
A house repiping cost calculator multiplies floor area by material and labor rates: an 800 sq ft home at $3 + $4 per sq ft costs about $5,600 to repipe.
How much does it cost to repipe a house?
This house repiping cost calculator multiplies the home’s floor area by a material rate and a labor rate per square foot: total = (length × width × material rate) + (length × width × labor rate). A 20 × 40 ft house is 800 sq ft, and at $3 + $4 per sq ft the repipe estimate is $5,600.
Enter the house length and width in feet and per-square-foot rates for material and labor. The calculator returns the area, material cost, labor cost, and total.
How the formula works
Square footage stands in for how much pipe the house holds. Bigger houses have longer runs from the main to each bathroom and kitchen.
- Area = length × width.
- Material = area × material rate. Pipe, fittings, valves, straps, and stub-outs.
- Labor = area × labor rate. Shutting off, cutting access holes, running new lines, connecting fixtures, and testing.
- Total = material + labor.
For a two-story house, enter total floor area, not just the footprint. A 30 × 40 ft footprint on two floors is 2,400 sq ft, so enter 30 and 80.
Worked examples
- Default: 20 ft × 40 ft, $3 material, $4 labor**
- Area: 20 × 40 = 800 sq ft
- Material: 800 × $3 = $2,400
- Labor: 800 × $4 = $3,200
- Total: $5,600
- Two-story: 30 × 40 ft footprint, $3.50 material, $5 labor**
- Area: 2 floors × 1,200 = 2,400 sq ft, entered as 30 × 80
- Material: 2,400 × $3.50 = $8,400
- Labor: 2,400 × $5 = $12,000
- Total: $20,400
What changes the price
| Factor | Effect |
|---|---|
| Pipe type | PEX usually costs less to buy and install than copper |
| Fixture count | Each sink, toilet, tub, and appliance adds a run and a connection |
| Stories | Vertical runs through floors take more time |
| Access | Crawlspaces and unfinished basements make runs easier than slabs |
| Wall finish | Plaster is slower to open and patch than drywall |
| Permits and inspection | Often required for a full repipe; check local code |
Signs a house may need repiping
| Sign | What it can point to |
|---|---|
| Rusty or brown water from hot and cold taps | Corroded galvanized steel pipe |
| Low pressure throughout the house | Pipes narrowed by internal buildup |
| Repeated pinhole leaks | Pipe wall wearing thin |
| Gray plastic supply pipe | Polybutylene, which many insurers and inspectors flag |
| Patchwork of many pipe types | Years of spot repairs |
A plumber can confirm the pipe type and condition. One leak alone is not always a reason to repipe.
How to gather the inputs
- Area: use the finished living area from your appraisal or listing, or measure each floor.
- Fixtures: count every sink, toilet, tub, shower, dishwasher, washer, ice maker, and hose bib. Bring this list when you get quotes.
- Rates: divide a written quote by your square footage to get a rate per square foot. Use that to compare bids.
Common mistakes
- Leaving out wall repair. Many repipe quotes stop at the pipe. Patching and painting can be a separate trade. The drywall finishing cost calculator gives a budget.
- Using footprint for a two-story house. That can halve the estimate.
- Not sizing for flow. Long runs to far bathrooms may need larger pipe. The pipe friction loss calculator shows pressure lost along a run.
- Forgetting the main line. The service line from the meter may be a separate job.
Related calculators
Check how much water a pipe size can carry with the GPM calculator. For water held in the lines, see the pipe volume calculator.
Estimates only. Plumbing work usually needs a licensed plumber and a permit. Get written quotes before you budget.
Frequently asked questions
How much does it cost to repipe an 800 sq ft house?
At this calculator's default rates of $3 per sq ft for material and $4 for labor, 800 sq ft costs $2,400 + $3,200 = $5,600. Replace both rates with figures from a plumber's quote, since pipe type, fixture count, and access change the price.
What does this repiping estimate include?
Material and labor for replacing the water supply lines, priced per square foot. It does not include drywall or plaster repair, painting, new fixtures, a water heater, permits, or drain and sewer lines. Ask whether your quote includes wall patching, because it is often a separate line.
Does repiping cost scale with square footage alone?
No. Fixture count and stories matter more. A 1,200 sq ft house with one bathroom has far fewer pipe runs than a 1,200 sq ft house with three bathrooms and a laundry room. Use square footage for a first budget, then check it against a per-fixture quote.
Is PEX cheaper than copper for repiping?
Usually, yes. PEX comes in long flexible coils, so it can be pulled through walls with fewer fittings and fewer openings. Copper is rigid, needs a joint at each turn, and the pipe itself usually costs more. If your quote is for copper, expect both rates to be higher than for PEX.
Should I repipe the whole house at once?
Often it is cheaper per foot of pipe. The crew sets up once, shuts the water off once, and opens walls in one pass. Doing one room at a time repeats that setup and can leave old and new pipe joined at many points.
Estimates only. Verify quantities with your supplier before purchasing.