CORNERSTONE MECHANICAL SOLUTIONS, 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, 100% are HVAC work.

HVAC · 2

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

Recent work

• Exterior install
  June 2026 · Howard County

  LEVEL 2 / KENNEDY KREIGER INSTITUTE / We will be demolishing the ductwork connected to the three existing rooftop units…

• HVAC install
  June 2026 · Howard County

  We will be demolishing the ductwork connected to the three existing rooftop units. Install new ductwork for existing un…

• Permit filed
  April 2026 · Anne Arundel County

  Install smoke evac system

Licensing

• Maryland HVACR Contractor Issued by Maryland Board of Heating, Ventilation, Air Conditioning and Refrigeration. Verify

What this page is, and is not

• Howard County: 2 permits observed, from records beginning August 2021.
• Anne Arundel County: 1 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 CORNERSTONE MECHANICAL SOLUTIONS, LLC under 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 HVAC contractors in Howard County