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, 91% are HVAC work.
HVAC
954
Plumbing
71
Electrical
17
Accessory Structure
3
Deck & Patio
1
Typical job observed: 3 ton systems, 200 amp service.
Licensed as
Master Plumber and Gas Fitter, Maryland HVACR Contractor, Licensed Electrician, Maryland State Electrician
Observed working in
Columbia, Ellicott City, Elkridge and 9 more
Observed filing in
3 counties
License numbers
001178, 001177, 000670, ES 11250, 20020095539, 20020063739, ES 10222, 05010096167
Each county's permit system holds only their own records, so the
combined view above exists nowhere else.
Recent work
-
Heat pump install
2 tons
September 2026 · Howard County
replaced existing with daikin dh4sea 2 ton heat pump and air handler
-
Furnace replacement
September 2026 · Anne Arundel County
replaced existing with rheem 89k oil furnace
-
Furnace replacement
1.5 tons
September 2026 · Anne Arundel County
replaced existing with daikin dc4sea 1.5 ton air conditioner and dr96sn 40k gas furnace
-
Water heater replacement
September 2026 · Anne Arundel County
replaced 50 gallon electric water heater
-
Electrical replacement
2.5 tons
September 2026 · Anne Arundel County
replaced existing with daikin dc4sea 2.5 ton air conditioner/coil
-
Electrical replacement
September 2026 · Howard County
Replaced existing with daikin dc4sea 3.5-ton air conditioner/coil
-
HVAC replacement
2.5 tons
September 2026 · Anne Arundel County
replaced existing with daikin dc4sea 2.5 ton air conditioner/coil
-
Gas water heater replacement
August 2026 · Howard County
replaced existing with 40 gallon gas water heater in basement
-
Heat pump install
3 tons
August 2026 · Howard County
replaced existing with daikin dh5sea 3 ton heat pump and air handler
-
Electrical replacement
3.5 tons
August 2026 · Frederick County
replaced existing with daikin dc4sea 3.5 ton air conditioner.
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
-
Maryland State Electrician
Issued by Maryland Board of Master Electricians.
Verify
Towns we observed them working in
ColumbiaEllicott CityElkridgeGlen BurnieLaurelHanoverJessupSevernFultonMarriottsvillePasadenaOdenton
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
2023
110
2024
328
2025
247
2026
361
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: 848 permits observed, from records beginning August 2021.
- Anne Arundel County: 184 permits observed, from records beginning December 2025.
- Frederick County: 14 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 HORIZON SERVICES MD LLC under
Master Plumber and Gas Fitter, Maryland HVACR Contractor, Licensed Electrician, Maryland State 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