MARYLAND MECHANICAL SYSTEMS INC.

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, 56% are plumbing work.

Plumbing 30

HVAC 22

Gas 1

Structural 1

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

Recent work

• Plumbing install
  August 2026 · Anne Arundel County

  Connect plumbing lines to temporary construction trailer for 1 water closet and 1 sink. Install approximately 25' of 3:…

• HVAC install
  August 2026 · Howard County

  Install one new exhaust fan with backdraft damper

• Water heater replacement
  July 2026 · Howard County

  Triadelphia ridge elementary school/ remove (2) existing water heaters and replace with (2) new water heaters

• Gas water heater replacement
  July 2026 · Howard County

  Triadelphia ridge elementary school/ remove (2) existing water heaters and replacing with (2) new gas water heaters

• HVAC replacement
  July 2026 · Howard County

  Modify existing ductwork and replace approximately 8 diffusers for room E105 located on the first floor

• Exterior install
  June 2026 · Anne Arundel County

  Remove six existing rooftop units and replace with six new rooftop units. Furnish and install required ductwork modific…

• Permit filed
  June 2026 · Anne Arundel County

  Install temp trailer w/ restroom july 2026-july 2027

• Heat pump install
  June 2026 · Howard County

  JHUAPL / BLDG MP6 / Install one VRV heat pump unit on the roof and two ductless cassette units on the 6th floor of room…

• Roof replacement
  May 2026 · Howard County

  BUILDING 012 / JHU APL/ Relocate 9 existing condensing units mounted on new roof supports located on the building 12 ro…

• Gas install
  April 2026 · Anne Arundel County

  Install new gas piping from existing 4" gas line approximately 20' to new Boiler

Licensing

• Master Plumber and Gas Fitter Issued by Maryland Board of Plumbing. Verify
• Maryland HVACR Contractor Issued by Maryland Board of Heating, Ventilation, Air Conditioning and Refrigeration. 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: 58 permits observed, from records beginning August 2021.
• Anne Arundel County: 7 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 MARYLAND MECHANICAL SYSTEMS INC. under Master Plumber and Gas Fitter, Maryland HVACR Contractor. 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 Plumbing contractors in Howard County