Residential water heater permits in Baltimore County, MD
497 residential water heater permits issued by Baltimore County (gas), Baltimore County (plumbing), Baltimore County (electrical), the 8 weeks ending Oct 17, 2026. Oct 17, 2026 is the latest issue date the source has published.
Quick answer. In the 8 weeks ending Oct 17, 2026, 497 residential water heater permits were issued in Baltimore County, MD, according to public records from Baltimore County (gas), Baltimore County (plumbing), Baltimore County (electrical). The busiest ZIP codes were 21117 (41 permits), 21208 (36 permits), 21222 (34 permits). The latest permit date published is Oct 17, 2026.
What a water heater permit means in Baltimore County
A residential water heater permit is a replacement or new install the homeowner has already arranged. For a water heater installer it marks a street of houses the same age with tanks on the same clock.
In Baltimore County, permits were issued on 38 different days in the window; the most recent were Oct 16, 2026, Oct 15, 2026, Oct 14, 2026. The busiest ZIPs were 21117 (41), 21208 (36), 21222 (34).
By residential water heater permit count, Baltimore County ranks #2 of the 40 water heater pages on this site and #1 of 3 in MD.
- Mail and door-hang the houses around each replacement.
- Track where tankless and heat-pump units are showing up by ZIP.
- Pass gas-to-heat-pump swaps to electricians: most need a new circuit.
Other work on the same permits
Share of these 497 permits whose type or description also matches another trade. These are the follow-on and partner trades on Baltimore County jobs.
- plumbing: 196 permits (39%)
- HVAC: 57 permits (11%)
- gas line: 48 permits (10%)
- sewer/septic: 29 permits (6%)
Weekly trend
Permits per 7-day period, ending Oct 17, 2026. n/c = not collected yet (before our pipeline started pulling this source). It is not zero. Striped bars are partly collected weeks.
Top permit types
| Permit type / subtype | Permits | Share |
|---|---|---|
| RESIDENTIAL GAS | 274 | 55% |
| RESIDENTIAL PLUMBING | 195 | 39% |
| RESIDENTIAL ELECTRICAL | 28 | 6% |
Busiest ZIP codes
| ZIP | Permits | Share | 8-wk avg / week |
|---|---|---|---|
| 21117 | 41 | 8% | 5.12 |
| 21208 | 36 | 7% | 4.50 |
| 21222 | 34 | 7% | 4.25 |
| 21228 | 30 | 6% | 3.75 |
| 21220 | 30 | 6% | 3.88 |
8-wk avg / week is the trailing 8-week weekly average we quote in coverage checks for that ZIP and trade. It counts every source in the ZIP and includes permits with unknown use, so it can be higher than this page's residential count.
Type stated in the permit
| Type | Permits | Share |
|---|---|---|
| gas tank | 243 | 49% |
| electric tank | 193 | 39% |
| tankless | 16 | 3% |
| heat-pump water heater | 8 | 2% |
Parsed from the permit's own type and work text. A permit can state more than one; many state none.
Sample rows
Anonymized: street address, permit number and any names removed. Subscribers get the full row with address, permit number and source link.
| Issued | ZIP | Permit type | Scope | Type | Declared value |
|---|---|---|---|---|---|
| 2026-10-16 | 21208 | RESIDENTIAL PLUMBING | HVAC + plumbing + water heater + kitchen/bath remodel + gas line | gas tank | n/a |
| 2026-10-08 | 21227 | RESIDENTIAL GAS | water heater | gas tank | n/a |
| 2026-10-02 | 21222 | RESIDENTIAL GAS | water heater | gas tank | n/a |
| 2026-09-25 | 21222 | RESIDENTIAL GAS | water heater | gas tank | n/a |
| 2026-09-14 | 21208 | RESIDENTIAL GAS | HVAC + water heater | gas tank | n/a |
| 2026-08-31 | 21227 | RESIDENTIAL PLUMBING | plumbing + water heater + new construction + sewer | electric tank | n/a |
Source
- Baltimore County (electrical): Permit records on bcgisdata.baltimorecountymd.gov, published by Baltimore County (electrical). Source dataset. Collected window(s): Aug 23, 2026 – Oct 17, 2026. Last pulled Oct 18, 2026.
- Baltimore County (gas): Permit records on bcgisdata.baltimorecountymd.gov, published by Baltimore County (gas). Source dataset. Collected window(s): Aug 22, 2026 – Oct 16, 2026. Last pulled Oct 18, 2026.
- Baltimore County (plumbing): Permit records on bcgisdata.baltimorecountymd.gov, published by Baltimore County (plumbing). Source dataset. Collected window(s): Aug 22, 2026 – Oct 16, 2026. Last pulled Oct 18, 2026.
Metric: Residential = the source marks the permit's use as residential (permits with commercial or unknown use are not counted). Water Heaters = the permit's type or work description matches the Curbside Signal water heater rules. Counts exclude void or cancelled permits. Dates are the jurisdiction's permit issue date. Records are deduplicated on source and permit number. How we count. Part of the Baltimore-Columbia-Towson, MD metro: every trade × city page there.
The honest limit. A permit usually means the job is already sold. We say that up front. The value is what happens around it:
- Neighbor marketing around active jobs: same-age houses on the same street.
- Cross-trade follow-on demand: new roof → solar, gutters, insulation; remodel → HVAC, electrical, landscaping, pool; new build → pest, security, landscaping.
- Competitor intelligence: which contractors pull permits where (where the jurisdiction publishes it), and who to recruit as subs.
- Early-stage projects for commercial trades and GC subs.
Follow-on: Water heater swaps lead to gas line, venting and electrical work, and to whole-house repipes in older homes.
Other trades in Baltimore County, MD
Residential permits in the same window, by trade.
Questions
How many residential water heater permits were issued in Baltimore County, MD recently?
497 residential water heater permits in the public records we pulled, the 8 weeks ending Oct 17, 2026. Source: Baltimore County (gas), Baltimore County (plumbing), Baltimore County (electrical).
Which Baltimore County ZIP codes have the most water heater permits?
21117 (41 permits), 21208 (36 permits), 21222 (34 permits), by residential water heater permit count the 8 weeks ending Oct 17, 2026. 42 ZIP codes had at least one permit.
What is the median declared value of a residential water heater permit in Baltimore County?
The source does not publish valuations for these permits.
How do I get the Baltimore County water heater permit list, and what does it cost?
Request a free sample for your ZIPs first. ZIP Pack is $29/mo for one trade and up to 5 ZIPs every Monday; Metro Feed is $99/mo for a whole metro and up to 3 trades, with daily alerts. Guarantee on every package: If a weekly file is late or missing, that month is free. If a month delivers under half the 8-week average permit count for your ZIPs and trade, the next month is free.
Baltimore County water heater leads, every Monday
Send your trade and ZIP codes. We'll reply with a real sample from the public records we pull, or tell you plainly that we don't cover you yet.