The County rule
From the County's adoptive ordinance (PDS 110, rev. 1 January 2026, read 26 October 2026), plumbing exemption (1): "Installing a replacement water heater with no change to the unit type or servicing utilities when performed by a California licensed plumbing contractor." The ordinance also says the person doing the work and "any person hiring another person" are both responsible for finding out whether a permit is required.
| Water heater job, unincorporated San Diego County | Permit? |
|---|---|
| Same type (gas tank for gas tank), same utilities, CSLB-licensed plumber | No |
| Same swap done by the homeowner | Yes |
| Tank to tankless | Yes, the unit type changes |
| Gas to electric or heat pump water heater | Yes, the servicing utility changes; a new circuit adds electrical |
| New gas line or larger gas service | Yes; Gas Line Repair is its own online permit type |
| Solar water heater | No-fee permit, inspections still required (PDS 612) |
This is the unincorporated county only: Fallbrook, Ramona, Lakeside, Spring Valley, Alpine, Valley Center and the other unincorporated communities. The City of San Diego and the other 17 cities have their own rules.
Applying online
The County's Online Services Central (read 26 October 2026) lists "Water Heater Replacement" among residential building permit types you can get online, next to Gas Line Repair, Electrical Service Upgrade and HVAC replacement, and lets you schedule, reschedule, cancel or get results for inspections online. File in Accela Citizen Access. In the County's open permit data, its online water heater type is scope code 8015, "(Online) Plumbing - HRA Water Heater R&R" (open data, counted 23 October 2026).
As owner-builder you sign the Owner-Builder Acknowledgement (PDS 421) and are "the responsible party of record on the permit".
What it costs
The fee schedule (PDS 613, effective 10 July 2026, read 26 October 2026) has no line for a water heater:
| PDS 613 permit | Fee |
|---|---|
| Plumbing only | $392 |
| Electrical and plumbing, or plumbing and mechanical | $498 |
| Electrical, plumbing and mechanical | $734 |
The schedule points to PDS 612 for Homeowner's Relief Act fees; that form names no-fee permits for solar photovoltaic systems, solar water heaters and small wind turbines, not ordinary water heaters. We could not confirm what the online HRA water heater type costs, so read the Accela invoice before paying.
What 1,253 County water heater permits show
| Measure | Unincorporated San Diego County water heaters |
|---|---|
| Residential permits, October 2023 to September 2026 | 1,253 |
| Firms | 80 |
| Firms with a permit in the last 12 months of the file | 47 |
| Completed (permits a year or more old) | 42.1% |
| Firms with 10+ permits under 70% completed | 12 of 15 |
| 10th / 90th-percentile busy firm | 12.9% / 72.0% |
| Share of permits held by the busiest firm / five busiest | 32.9% / 73.8% |
| Busiest firm's completed share | 19.5% |
| Firms matched to an active CSLB license | 85.0% |
| Busiest / quietest month (index, 100 = average) | January (115) / May (81) |
Two things stand out. Permits are filed even though a licensed like-for-like swap is exempt; the file does not say which were type changes, owner installs or optional filings. And most are never closed: 42.1% completed overall, 12 of 15 busy firms under 70%, and the firm with the most permits, holding 32.9% of them, completed 19.5%. If your job needs a permit, ask who books the final and check the status in Accela afterwards. Filing peaks in January and is quietest in May. The County file carries no job value for water heaters, so we show no price; national figures are in water heater replacement cost.
See every County water heater installer by permits completed and CSLB license →
Related
Compare installers on the San Diego County water heater list. The rest of the plumbing rules: San Diego County plumbing permit. License steps: San Diego County contractor license lookup; past permits: San Diego County building permit search; monthly counts: San Diego County permit statistics. Other places: do I need a permit for a water heater. What to ask: hiring a plumber.
What this does not tell you
Water heater permits here are completed so rarely that we show no days-to-final figure. "Completed" is the County's completed status; an open permit can mean the final was never booked. Exempt swaps leave no permit, so our count is not the number of water heaters replaced.
How we know this
The exemption is quoted from the County's adoptive ordinance (PDS 110), the online permit types from PDS Online Services Central, fees from PDS 613 and Homeowner's Relief Act terms from PDS 612, read 26 October 2026; owner-builder terms are from PDS 421 and the scope code from the County's Building Permits open data, read 23 October 2026. Counts are County PDS residential water heater permits, October 2023 to September 2026; "completed" uses permits a year or more old, and license status is our match to CSLB records.
Numbers come from San Diego County Planning & Development Services building permits on homes in the unincorporated county (the County's open-data permit, contractor and status-history files), data through October 20, 2026. Nobody paid to be on this page and nobody can.
Questions
- Do I need a permit to replace a water heater in San Diego County?
In the unincorporated county, not if a California licensed plumbing contractor installs a replacement 'with no change to the unit type or servicing utilities'. A switch from gas to electric or tank to tankless, or a homeowner install, needs a permit; the County offers a Water Heater Replacement permit online.
- Can I replace my own water heater in San Diego County?
Yes, with a permit. The PDS 110 exemption applies only when a licensed plumbing contractor does the swap, so a homeowner install needs a permit and inspection. As owner-builder you sign PDS 421 and become the responsible party on the permit.
- How much is a water heater permit in San Diego County?
The County's fee schedule (PDS 613, effective 10 July 2026) has no separate water-heater line; a plumbing-only permit is $392 and plumbing combined with electrical or mechanical $498. Check the invoice in Accela for the online Water Heater Replacement type.
- Do I need a permit for a tankless water heater in San Diego County?
Yes if you are replacing a tank. The exemption covers a replacement with no change to the unit type or servicing utilities, so tank to tankless, or a new gas line or circuit, is permit work.
- Does a water heater permit in San Diego County get finaled?
Often not. Only 42.1% of County water heater permits a year or more old in our file were marked completed, and 12 of the 15 firms with 10 or more permits were under 70%.
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 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 water heater permit in Bellevue, WA? Gas vs electric, emergencies, and one firm with most of the permits
- Do I need a water heater permit in Sacramento County? Yes: the online permit, inspection 350, and why so many stay open
- Do I need a permit to replace a water heater in Scottsdale? Yes: the Minimum Plumbing Permit, the $63 line and the winter rush
For one city
- Building Permit Requirements per Adoptive Ordinance (PDS 110, rev. 01/01/2026) — County of San Diego PDS (accessed 2026-10-26)
- Online Services Central — County of San Diego PDS (accessed 2026-10-26)
- Building Fee Schedule (PDS 613, effective 07/10/2026) — County of San Diego PDS (accessed 2026-10-26)
- Homeowner's Relief Act (PDS 612, rev. 06/20/2025) — County of San Diego PDS (accessed 2026-10-26)
- Owner-Builder Information (PDS 421) — County of San Diego PDS (accessed 2026-10-23)
- Accela Citizen Access — County of San Diego (2026-10-26)
- Building Permits — San Diego County open data (scope code counts) (counted 2026-10-23)