MARYLAND MECHANICAL SYSTEMS INC.

Trade activity

Permits by year

Properties they work on

Property profile is based on 4 matched county property records.

Recent permits

Date	County	Type	Description
Jul 16, 2026	Howard County	Commercial HVAC Addition Alteration Permit	Modify existing ductwork and replace approximately 8 diffusers for room E105 located on t…
Jul 15, 2026	Howard County	Commercial HVAC New Permit	Modify existing ductwork and replace 8 air diffusers in room 105 which is located on the …
Jun 8, 2026	Howard County	Commercial HVAC Addition Alteration Permit	JHUAPL / Replace one existing Liebert air conditioning unit with one new Mitsubishi air c…
Jun 3, 2026	Howard County	Commercial HVAC Addition Alteration Permit	JHUAPL / BLDG MP6 / Install one VRV heat pump unit on the roof and two ductless cassette …
Jun 1, 2026	Howard County	Commercial HVAC Addition Alteration Permit	JHUAPL / BLDG RP1 / modify existing ductwork and install one wave guide
May 20, 2026	Howard County	Commercial HVAC Addition Alteration Permit	BUILDING 012 / JHU APL/ Relocate 9 existing condensing units mounted on new roof supports…
May 20, 2026	Howard County	Commercial Plumbing Addition Alteration Permit	BLDG 12/JHU-APL/Install 1-roof hydrant and 2-wall hydrants along with required domestic w…
May 15, 2026	Howard County	Commercial HVAC Addition Alteration Permit	JHUAPL / BLDG 26 / Install one cooling only supplemental air conditioning unit in buildin…
May 14, 2026	Howard County	Commercial Alteration Permit	BLDG MP7 / JHUAPL / REMOVE EXISTING LIEBERT A/C SYSTEM, INSTALL NEW MITSUBISHI MINI SPLIT…
Apr 15, 2026	Howard County	Commercial Alteration Permit	JHUAPL / BLDG MP6 / MODIFY THE EXISTING CEILING, DEMOING A WALL TO MAKE ADDITIONAL SPACE,…

Source: county permit records. Updated monthly. Not every filing names a contractor, so these counts are a floor; actual permit activity is usually higher.