Michael Bonsby HVAC, Plumbing & Electrical

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, 60% are HVAC work.

HVAC · 3Accessory Structure · 1Electrical · 1

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

Recent work

• EV charger install
  August 2026 · Frederick County

  Install new Level 2 EV Charger in garage. Install new 12 Space Sub-panel next to main electric panel in garage. Install…

• Furnace replacement
  May 2026 · Anne Arundel County

  Replacement of Ac and Gas furnace Ameristar 14 SEER Air Conditioner: A5AC4024A1000A Comfort Coil: 5TXCB003 A951 Gas Fur…

• Electrical replacement 200 amps
  April 2026 · Frederick County

  200 AMP to 200AMP service Replacement. Existing indoor panel is to remain.W/o #777292448

• Heat pump install 4 tons
  August 2024 · Frederick County

  Replace current HVAC system with 5.3 SEER2 4ton Heat Pump & Air Handler.

Licensing

• 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.

What this page is, and is not

• Frederick County: 4 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 Michael Bonsby HVAC, Plumbing & Electrical 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 Frederick County