CHARLES A KLEIN & SONS, 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, 59% are HVAC work.

HVAC 132

Plumbing 87

Accessory Structure 4

Fire Protection 1

Typical job observed: 2.8 ton systems, 65,000 BTU.

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

Recent work

• Interior addition
  September 2026 · Howard County

  SFD/ Install plumbing fixtures for addition on existing SFD//1st floor: 1 water closet/2 lavatories/1 shower.

• Heat pump install 2 tons
  September 2026 · Prince George's County

  Direct replacement of 2 ton heat pump with equipment of same size and location.

• HVAC install
  September 2026 · Howard County

  Install new HVAC equipment and duct work for new SFD. / ENERGY METHOD = ERI

• Furnace replacement
  August 2026 · Howard County

  Sfd/'federal hill ii'/install plumbing fixtures and piping// plumbing fixtures basement: 1 bathub/1 lavatory/1 water cl…

• Electrical replacement
  August 2026 · Anne Arundel County

  Limited electrical associated with HVAC direct replacement.

• HVAC replacement
  August 2026 · Anne Arundel County

  Direct replacement of 3.5 ton and a 80K btu.

• Gas water heater replacement
  June 2026 · Anne Arundel County

  Direct replacement of gas water heater.

• Plumbing install
  June 2026 · Howard County

  SFD/Install new gas range with new gas line and service. (BGE W.O. #20784255)

• HVAC addition
  April 2026 · Howard County

  Install HVAC equipment and duct work for addition to SFD / ENERGY METHOD = Prescriptive Method

• Heat pump install
  March 2026 · Howard County

  Install heat pump and duct work for new addition to SFD. / ENERGY METHOD = Performance Method

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
• Licensed Electrician Issued by Maryland Board of Master Electricians. 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: 215 permits observed, from records beginning August 2021.
• Anne Arundel County: 6 permits observed, from records beginning December 2025.
• Frederick County: 2 permits observed, from records beginning August 2021.
• Prince George's County: 1 permits observed, from records beginning August 2026.

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 CHARLES A KLEIN & SONS, INC. under Master Plumber and Gas Fitter, Maryland HVACR Contractor, Licensed Electrician. 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