Christopher J Grenfell

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, 93% are plumbing work.

Plumbing 25

Pool & Spa 2

Recent work

• Plumbing work
  August 2026 · Frederick County

  Run gas line approximately 60 feet to outside natural gas fire place. Related building permit #507464

• Interior work
  August 2026 · Frederick County

  Master bath remodel on the 2nd floor of the single family dwelling to include new shower fixtures, new shower drain and…

• Plumbing install
  August 2026 · Frederick County

  Hook up city utilities into building. Bring in 4" water main and 4" sewer line into building and disconnect the current…

• Interior install
  July 2026 · Frederick County

  Break up flooring and add bathroom in basement to include one toilet, single vanity and shower. Repipe first floor bath…

• Furnace install
  June 2025 · Frederick County

  Add one full bathroom to include a toilet, shower and sink to pool house.Related Permit #492377Revised 9.17.25- Add on …

• Pool install
  May 2025 · Frederick County

  Install NG gas fire place and gas pool heaterRelated Pool Permit #: 493884

• Basement bathroom install
  April 2025 · Frederick County

  Install plumbing for basement bathroom to include toilet, shower, and vanity as well as washing machine and laundry sin…

• Kitchen renovation
  September 2024 · Frederick County

  Install outdoor kitchen sink, Install outdoor fireplace

• Interior addition
  March 2024 · Frederick County

  Adding addition to home installing bathroom and laundry

• Roof replacement
  September 2023 · Frederick County

  Replace Trac pipe from roof top units and install proper gas piping materials.

Licensing

Frederick County does not publish license records with its permit data, so none appear here. That is a gap in the county's published data, not a statement about this contractor.

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: 27 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 here do not list a license type for this contractor. That does not mean the contractor is unlicensed; not every county publishes license data with its permits.

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.

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