What happens when a plumber comes to your home?
Updated · KeystoneProGuide editorial team
What happens first?
A diagnosis, and usually a fee for it. Angi says nearly all plumbers charge a call fee to cover the visit and estimate, and Fixr says the service call typically covers diagnosing the problem, inspecting the area and minor repairs that need few materials. If the fix is small, that may be the whole bill. If it is bigger, the next step is a price.
Before the plumber arrives, find your shut-off valve; the Philadelphia Water Department says it is usually near the water meter. Clear a path to the problem, and be ready to say when it started.
When should you get a written price?
Before the work starts on anything more than a quick repair. For home improvement work over $500, Pennsylvania requires a written contract signed by you and the plumber, with the work, approximate start and completion dates and the total price, plus a notice of your right to cancel. If the plumber prices by time and materials, the law requires a written initial estimate first, and the final bill may not exceed it by more than 10% unless you sign a change order.
After you sign, you still have three business days to cancel. The Attorney General's office says the state Supreme Court has confirmed that you can cancel by phone, in writing or in person, as long as the contractor actually receives the notice. A genuine emergency repair done under the consumer protection law's emergency provisions follows different rules, and requires a signed waiver.
Does the work need a permit, and who files it?
Your municipality decides, under the state construction code, which says an ordinary repair needs no permit but that adding or relocating water, drain, waste or vent piping is not ordinary. An emergency repair can be done first, with the permit application within 3 business days.
Philadelphia shows how the process runs where it applies. A permit application must give the complete scope of work and current owner information, a licensed master plumber must oversee the work, applications without plans are reviewed while you wait at the city's permit center, and the inspections listed on the permit must be passed before the city issues a Certificate of Approval. The city's page tells the applicant to arrange those inspections with the assigned inspector, so agree in advance who will do it.
What if the plumber has to open a wall or floor?
Then the job grows. Angi says costs rise when a plumber must cut drywall or remove flooring to reach the pipes, and that the plumber may suggest a separate contractor for the structural repair afterward. Ask before the work starts who patches the opening and whether that is in the price.
What happens on a water heater replacement?
The new heater has to meet the code's safety rules. Pennsylvania's residential code requires a temperature-and-pressure relief valve with a discharge pipe that ends no more than 6 inches above the floor or a drain, where you can see it. It calls for a drain pan where a leaking tank would cause damage, and for a gas or other ignition-source heater in a garage to have its ignition source at least 18 inches off the floor.
How long it takes depends on the swap. HomeGuide notes that a like-for-like replacement typically costs less than a retrofit that needs new plumbing or electrical work, and ENERGY STAR says a heat pump model may take longer to install than a standard heater, and that the installer may need time to order it. Ask whether the price includes hauling the old tank away.
What happens on a sewer line job?
Usually a camera goes in first. This Old House says most sewer projects begin with a camera inspection to find blockages, cracks or collapsed sections and choose the repair. Ask to see the footage.
A recent Pennsylvania case shows why. In an October 2026 settlement over allegedly unnecessary sewer replacements, the Attorney General required the company involved to document the defects behind any replacement it recommends, to try several times to open a line with a snake before selling excavation, and to tell customers they can get a second opinion. Nothing stops you asking the same of any company.
What should you check before the plumber leaves?
- That the fix holds. For a leak, read the water meter, use no water for two hours and read it again; the EPA says any movement probably means a leak is still there.
- That the paperwork is complete. The Better Business Bureau suggests a written contract with all pricing and scope, and written receipts for every payment.
- That the inspection is scheduled, if there was a permit.
- That the final payment waits. The Federal Trade Commission advises never making the final payment until the work is done and you are satisfied.
Questions to ask a plumber lists what to settle before the visit, the cost guide gives price ranges, and plumbers in the area are on the plumbers directory page.
Sources
- How Much Does Plumbing Repair Cost? [2026 Data], Angi
- How much does it cost to hire a plumber?, Fixr
- Frequently Asked Questions: Home Improvement Contractor Registration, Pennsylvania Office of Attorney General
- PA Supreme Court Upholds Consumer Right-to-Cancel Home Improvement Contracts Within Three Days Regardless of Medium, Pennsylvania Office of Attorney General
- Get a Plumbing Permit, City of Philadelphia
- 34 Pa. Code § 403.62. Permit requirements and exemptions., Commonwealth of Pennsylvania (Pennsylvania Code)
- Chapter 28 Water Heaters, 2021 International Residential Code, International Code Council
- Heat Pump Water Heaters, ENERGY STAR
- How Much Does Water Heater Installation or Replacement Cost? (2026), HomeGuide
- How Much Does Sewer Line Replacement Cost? (2026 Pricing), This Old House
- AG Sunday Obtains Settlement Requiring Home Improvement Group to Pay Consumer Restitution and Undergo Robust Technician Certification Programs, Pennsylvania Office of Attorney General
- BBB Tip: Hiring a plumber during winter storms, Better Business Bureau
- How To Avoid a Home Improvement Scam, Federal Trade Commission
- Fix a Leak Week, U.S. Environmental Protection Agency (WaterSense)
- All About Frozen Pipes, Philadelphia Water Department