David Nau

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, 86% are electrical work.

Electrical 36

Accessory Structure 2

HVAC 2

Plumbing 1

Pool & Spa 1

Typical job observed: 60 amp service.

Recent work

• Electrical install 60 amps
  August 2026 · Frederick County

  Install (1) 40-amp ckt in basement for geothermal compressor Re-use existing 60-amp ckt in attic for geothermal aux heat

• Electrical service upgrade 200 amps
  January 2026 · Frederick County

  Heavy up from 100 amps to 200 amps Install (1)40 amp ckt for geo thermal compressor (1) 60 amp ckt for geo thermal for …

• Electrical install 50 amps
  December 2025 · Frederick County

  Install 1) 50 amp ckt in basement for geo thermal compressor installation.

• Electrical install 70 amps
  December 2025 · Frederick County

  Install 1) 70amp ckt 1) 15 amp ckt 1) 20 amp 1) 15 amp ckt for geo thermal installation

• Electrical install 40 amps
  October 2025 · Frederick County

  Install 2) 40 amp ckts in basement for Geo thermal compressors

• Electrical service upgrade 400 amps
  June 2025 · Frederick County

  Heavy up existing power service from 200 amps to 400 amps. Placing new 200 amp panel in existing garage Reference Potom…

• Accessory structure install 60 amps
  May 2025 · Frederick County

  Install (1) 50 amp, (1) 60 amp, (1) 30amp, (2) 35 amp ckts in basement; (1) 60 amp ckt in garage; and (1) 60 amp ckt in…

• Electrical install
  April 2025 · Frederick County

  Install 3 circuits for new septic system.

• Electrical work 400 amps
  February 2025 · Frederick County

  Heavy-up from 200 amps to 400 ampsWO# 1996554572

• Water heater replacement 60 amps
  October 2024 · Frederick County

  Install (2) 60 amp circuits, (1) 30 amp circuit, (1) 45 amp circuit in basement. For geo thermal install, (1) 30 amp ci…

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: 42 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.

Other Electrical contractors in Frederick County