TRI-STATE HOME SERVICES

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, 55% are HVAC work.

HVAC 96

Plumbing 58

Electrical 16

Accessory Structure 3

Deck & Patio 1

Typical job observed: 180,000 BTU, 200 amp service.

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

Recent work

• Furnace replacement
  September 2026 · Frederick County

  Replace n/g furnace

• Plumbing repair
  August 2026 · Frederick County

  Excavate 10 ' to repair Crack on 6" clean out line

• Plumbing replacement
  July 2026 · Frederick County

  Replace 50gal n/g power vent

• Heat pump install 100 amps
  July 2026 · Frederick County

  Replace 100amp sub panel, run a 45amp circuit for air handler, 40amp circuit for heat pump , 20amp circuit for exterior…

• Plumbing work
  July 2026 · Frederick County

  Moved natural gas line from island to wall approx. 5'

• Water heater replacement
  June 2026 · Frederick County

  Replace 40gal n/g water heater

• Generator install 200 amps
  June 2026 · Frederick County

  200amp panel replacement / w Generator hook up.W/o #777-890-657

• Electrical upgrade
  June 2026 · Frederick County

  Electrical panel upgrade 200a-200aWO# 777680846

• Kitchen renovation
  June 2026 · Frederick County

  Relocating gas line for kitchen renovation

• Electrical service upgrade 200 amps
  May 2026 · Frederick County

  Electrical panel Upgrade 200amp + 200 amp meter socket & Heavy up 100-200amps

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.

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

• Frederick County: 172 permits observed, from records beginning August 2021.
• Howard County: 2 permits observed, from records beginning August 2021.

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 TRI-STATE HOME SERVICES 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