J&J MECHANICAL LLC

Permits are pulled before work begins and then inspected by the county. A contractor who files them is working inside a system with an inspector in it, which is what unpermitted work avoids.

What the permits show

Of the permits we observed, 71% are HVAC work.

HVAC 15

Plumbing 6

Each county's permit system holds only their own records, so the combined view above exists nowhere else.

Recent work

• Heat pump install
  July 2026 · Anne Arundel County

  HVAC Equipment • Furnish and install four (4) Carrier gas fired rooftop units tagged RTU-1 through RTU-4. • Furnish and…

• Roof replacement
  July 2026 · Anne Arundel County

  Demo • Demo and dispose of six (6) existing rooftop units HVAC Equipment • Furnish and install six (6) new rooftop unit…

• Exterior install
  July 2026 · Anne Arundel County

  Demo • Demo and dispose of one (1) existing rooftop unit. • Cap curb water tight with insulated curb cap. HVAC Equipmen…

• HVAC install
  July 2026 · Anne Arundel County

  Heaters • Furnish and install three (3) electric unit heaters tagged UH-1 through UH-3. • Cap water tight three (3) uni…

• Plumbing replacement
  April 2026 · Howard County

  replace broken Sewer line

• Furnace install 60,000 BTU
  March 2026 · Howard County

  Sfd/ repipe and add 1 bath to existing house, fixtures: 3-bathtubs, 2-showers, 5-lavs, 4-water closets, 1-kitchen sink,…

• Plumbing install
  December 2025 · Howard County

  Sfd/ finish portion of the basement install 1-lav, 1-water closet, 1-laundry tray, 1-wet bar

• Kitchen renovation
  November 2025 · Howard County

  SFD/ ADDING PLUMBING FIXTURES AN REPIPING EXISTING FIXTURES - 2-BATHTUBS, 2-SHOWERS, 4-LAVS, 3-WATER CLOSETS, 1-KITCHEN…

• Plumbing work
  June 2025 · Howard County

  SFD/re-pipe second floor bath (1-toilet, 2 lavies, 1 tub, 1 shower)

• HVAC replacement
  April 2025 · Howard County

  Kittamaqundi Church/HVAC replacement.

Licensing

• Maryland HVACR Contractor Issued by Maryland Board of Heating, Ventilation, Air Conditioning and Refrigeration. Verify
• Master Plumber and Gas Fitter Issued by Maryland Board of Plumbing. Verify

Towns we observed them working in

We hold permit records for Anne Arundel County, Baltimore City, Baltimore County, Carroll County, Frederick County, Howard County, Prince George's County, and Washington DC. Work anywhere else is not missing from this contractor's record, it is outside what we cover.

Permits by year

Our records for this contractor's counties begin August 2021. Years before that are not shown because we hold nothing for them, not because nothing happened.

What this page is, and is not

• Howard County: 12 permits observed, from records beginning August 2021.
• Anne Arundel County: 9 permits observed, from records beginning December 2025.

This page shows permits we observed in county records. Our observation is not complete: work done before those dates, in counties we do not cover, or on filings that name no contractor does not appear here. A contractor's real work is almost always greater than what we observed, and absence of a permit on this page does not mean the work was not done or not permitted. We currently hold records for Anne Arundel County, Baltimore City, Baltimore County, Carroll County, Frederick County, Howard County, Prince George's County, and Washington DC; see permit coverage for what that includes.

Common questions

Does a permit record mean this contractor is licensed?

County permit records list J&J MECHANICAL LLC under Maryland HVACR Contractor, Master Plumber and Gas Fitter. Check current standing with the issuing body before hiring.

Why do some contractors show more permits than others?

Counties began publishing at different times and describe contractors differently, so the number reflects what we observed as much as what the contractor did. It is not a ranking.

What should I still ask for?

Proof of insurance, a written contract, and the license number for the trade being performed. A permit record is a starting point, not a substitute for either.

Other HVAC contractors in Howard County