The Town's rule and its exception
From the Town's Residential Permits FAQ, read 23 October 2026, the permit list includes "Replacement of water heaters", followed by: "Exception: in one- and two-family dwellings when there is no change in the location, size and heating capacity, fuel or energy source, or routing or sizing of the vent or plumbing piping, and the work is done by a licensed Plumbing Contractor."
| Water heater job | Permit in Cary? |
|---|---|
| Same tank, same spot, same fuel and venting, by a licensed plumbing contractor | No: the exception |
| The same swap done by the homeowner | Yes: the exception requires a licensed plumbing contractor |
| Moving it (garage to attic, closet to closet) | Yes: change in location |
| 40 to 50 gallons, or a higher-input burner | Yes: change in size or heating capacity |
| Gas to electric, electric to heat-pump, or the reverse | Yes: change in fuel or energy source |
| Tank to tankless | Yes in almost every case: new venting, gas sizing or capacity |
| New vent run or resized gas or water piping | Yes |
| Townhouse or condo in a larger building | Not a one- or two-family dwelling; ask 311 |
The exception is all-or-nothing: one changed item and the job needs a permit. The 40-to-50-gallon and tankless rows are our reading of "size and heating capacity" and "routing or sizing of the vent"; confirm with 311, or (919) 469-4046 from outside Cary, if your plumber says otherwise.
Who can do it
A licensed plumbing contractor. The state board licenses "Anyone who contracts to install, alter or restore plumbing, heating (includes air conditioning) or fire sprinkler systems" (Consumer Awareness). Search the firm on the board's license search. Only a licensed plumbing contractor can use the exception, so for a permit-free swap check that the firm's license on the board's search is a plumbing license, not only heating.
You, on your own home. The Town says "an owner of the property can do their own building, electrical, plumbing, and mechanical work", provided the property is the owner's primary residence for at least 12 months after completion. A homeowner install always needs the permit.
Inspections and expiry
- Which inspections: set by plan review and "listed on the permit documents at issuance".
- Booking: in Building Permits Online, at Town Hall (316 N. Academy St.), or by phone on 311.
- Expiry: "A permit is active for six months without any activity, or one year after the last inspection" (Residential Inspections Information).
- Done means certified: a Certificate of Compliance goes to the contractor and the owner when the required inspections pass.
The Town's FAQ points to its Fees Estimation Guide for permit fees; we could not open it to verify the current plumbing fee, so we give none. Ask 311.
What 1,519 Cary water heater permits show
| Measure | Cary water heaters |
|---|---|
| Permits, October 2023 to September 2026 | 1,519 |
| Firms | 117 |
| Firms with a permit in the 12 months to September 2026 | 74 |
| Usual filed value | $4,253 |
| Middle half of firms' usual job value | $3,442 to $6,000 |
| Passed final (permits a year or more old) | 92.9% |
| Usual days from issue to final | 16 |
| 10th / 90th-percentile firm (10+ permits) | 74.1% / 98.5% |
| Share held by the five busiest firms | 52.8% |
| Busiest / quietest month (index, 100 = average) | January (131) / September (69) |
These 1,519 permits are the jobs that fell outside the exception, or where the firm pulled one anyway; permit-free like-for-like swaps leave no record and are not counted. Water heater permits close fast here, in a usual 16 days, and 92.9% pass final. Filing peaks in January at about twice the September rate. Five firms hold 52.8% of permits. Prices by home value: Cary water heater cost.
See every Cary water heater installer by permits finaled →
Related
Other places' rules: do I need a permit for a water heater; national prices: water heater replacement cost; the checklist: hiring a plumber. Gas line changes for a new heater: do I need a permit for a gas line and the Cary gas line compare list. License steps: Cary contractor license lookup; records: Cary building permit search; counts by year: Cary permit statistics.
What this does not tell you
Exempt swaps are invisible to us, so our count understates how many water heaters are replaced in Cary. License status is not on our Cary pages, and a recent permit may simply not be finaled yet.
How we know this
The permit rule, exception and owner rule are quoted from the Town of Cary's Residential Permits FAQ, read 23 October 2026, and inspection and expiry wording from its Residential Inspections Information page; the licensing rule is from the NC plumbing and heating board, read 22 October 2026. Our counts come from the Town's Building Permit Applications open data, water heater permits on homes, October 2023 to September 2026; "passed final" counts permits a year or more old.
Numbers come from Town of Cary building permit applications (issued permits only), data through October 16, 2026. Nobody paid to be on this page and nobody can.
Questions
- Do I need a permit to replace a water heater in Cary, NC?
Yes, unless every condition of the Town's exception is met: a one- or two-family home, no change in location, size, heating capacity, fuel or energy source, or vent or piping routing and sizing, and the work done by a licensed plumbing contractor.
- Do I need a permit to switch to a tankless water heater in Cary?
In our reading of the Town's rule, almost always: a tankless unit usually changes the heating capacity, venting or gas piping, and any change in those takes the job outside the Town's like-for-like exception, so the permit is required.
- Can I replace my own water heater in Cary without a permit?
No. The exception only applies when the work is done by a licensed plumbing contractor. A homeowner can do the work on their primary residence, but needs the permit and inspection.
- How long does a water heater permit take in Cary?
The usual Cary water heater permit passed final 16 days after issue, and 92.9% of permits a year or more old had passed final.
- How much does a water heater replacement cost in Cary?
The usual Cary water heater permit carried a filed value of $4,253, and the middle half of firms' usual jobs ran $3,442 to $6,000. That is the value on the permit, not a quote.
Build your own list
Every firm with that kind of permit on record. Pick what you value. The list moves.
Related guides
- Do I need a permit? 13 common home projects, checked against city rules and permit files
- Do I need a permit to replace a water heater? The rule in 12 cities, and how many get filed
- Ames building permit search: how to look up permits on an address
- Do I need a permit to replace a water heater in Ames? Yes: the $59.07 permit, the inspection, and homeowner rules
- Do I need a permit to replace a water heater in Denton, TX? The $50 permit and what the inspector checks
- Do I need a permit to replace a water heater in Elk Grove? Yes: the minor permit, the inspection checklist, and heat pump conversions
For one city
- Cary contractor license lookup: which NC board, where to search, and what the permits show
- Home improvement costs in Cary, NC (2026): what 16 kinds of jobs were filed at
- Cary irrigation rules: alternate-day watering, the rain sensor ordinance, the irrigation permit and the $2,500 licensed-contractor line
- Residential Permits & Inspections FAQ — Town of Cary (accessed 2026-10-23)
- Residential Inspections Information — Town of Cary (2026-10-23)
- Building Permits Online — Town of Cary (2026-10-23)
- Consumer Awareness — NC State Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors (2026-10-22)
- Verify License Search — NC State Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors (2026-10-22)