Updated: May 19, 2026
Location and Projects
Address
144 THURGOOD STREET, Gaithersburg, MD, 20878
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Sonic Plumber
Sonic LLC, 144 Thurgood St, Gaithersburg, MD (Owned by: Christopher Robertson) holds a Plumbers license and 5 other licenses according to the Maryland license board.
Their BuildZoom score of 105 ranks in the top 8% of 58,058 Maryland licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Sonic LLC, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Sonic LLC Services
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Sonic LLC Contact Information
Phone Number: (301) 302-2194
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Address: 144 THURGOOD STREET, Gaithersburg, MD 20878
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Replaced existing rpz backflow for dental equipment pump/vacuum watts lf009qt 1/2 serial # 409824
Valuation:
N/A
Permit #:
P24001043
Status:
complete
Fee:
$105
Permit Type:
N/A
Building Type:
N/A
Install plumbing for wet bar and full bathroom with sewage ejector pit
Valuation:
N/A
Permit #:
468482
Status:
complete
Fee:
$183
Permit Type:
Plumbperm
Building Type:
N/A
Gas cooking appliance
Valuation:
N/A
Permit #:
SFP-1422121-2023
Status:
final
Fee:
$135
Permit Type:
N/A
Building Type:
N/A
Cross connection - remove testable bfp
Valuation:
N/A
Permit #:
SFP-1462168-2024
Status:
final
Fee:
$150
Permit Type:
N/A
Building Type:
N/A
Valenstein - 6908 oakridge ave
Valuation:
N/A
Permit #:
PFG-1402043-2022
Status:
final
Fee:
$645
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
FG-1438647-2023
Status:
final
Fee:
$265
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
PFG-1433526-2023
Status:
final
Fee:
$815
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
PFG-1431530-2023
Status:
final
Fee:
$1,130
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
PFG-1431073-2023
Status:
final
Fee:
$290
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
FG-1426388-2023
Status:
final
Fee:
$265
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
PFG-1367881-2021
Status:
final
Fee:
$263
Permit Type:
N/A
Building Type:
N/A
Re-inspect fee
Valuation:
N/A
Permit #:
SFP-1418413-2022
Status:
final
Fee:
$135
Permit Type:
N/A
Building Type:
N/A
Gas water heater
Valuation:
N/A
Permit #:
SFP-1382436-2022
Status:
final
Fee:
$124
Permit Type:
N/A
Building Type:
N/A
Residential plumbing addition alteration permit
2018-07-30
Single family dwelling new gas line from meter to new grill on deck and new fire pit in yard. will set fixtures at end of project
Valuation:
N/A
Permit #:
P18003308
Status:
complete
Fee:
$193
Permit Type:
N/A
Building Type:
N/A
Hvac contractor hired me do take care of the gas portion only of a furnace replacement
Valuation:
N/A
Permit #:
P19000521
Status:
complete
Fee:
$55
Permit Type:
N/A
Building Type:
N/A
Water service - interior re-piping
Valuation:
N/A
Permit #:
SFP-1447155-2023
Status:
final
Fee:
$150
Permit Type:
N/A
Building Type:
N/A
17 - (nr) - remodeling/additional work/tenant space
2023-12-22
Howard sachs - 6510 bells mill rd
Valuation:
$14
Permit #:
PFG-1443688-2023
Status:
final
Fee:
$1,175
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
SFP-1391124-2022
Status:
final
Fee:
$124
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
PFG-1389788-2022
Status:
final
Fee:
$263
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
SFP-1389786-2022
Status:
final
Fee:
$124
Permit Type:
N/A
Building Type:
N/A
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120
BZ Score
-
Avg Project
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Projects
120
BZ Score
$1.5K
Avg Project
-
Projects
120
BZ Score
$1.5K
Avg Project
-
Projects
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Verified License
BuildZoom confirmed this contractor's license
Sonic LLC License info
Verified License
| License # | 93968 |
| Status | Active |
| State | Maryland |
| Type | Plumbers |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Sonic LLC at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 93968 |
| Status | Active |
| State | Maryland |
| Type | Home Improvement |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Sonic LLC at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 2705134544 |
| Status | Active |
| State | Virginia |
| Type | Commercial Improvement (Cic), Home Improvement (Hic) |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Sonic LLC at the Virginia Department of Professional and Occupational Regulation.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 93968 |
| Status | Active |
| State | Pennsylvania |
| Type | Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2014. Check the current license status of Sonic LLC with the Pennsylvania Office of the Attorney General
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 124588 |
| Status | Active |
| State | Maryland |
| Type | Contractor (Corppart) Home Improvement |
- When BuildZoom last verified this license, it had an expiration date of December, 2014. Check the current license status of Sonic LLC with the Maryland Department of Labor, Licensing & Regulation
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 410519000452 |
| Status | Inactive |
| City | District Of Columbia |
| Type | Gen Contr Construction Mngr |
- According to the Department of Consumer and Regulatory Affairs, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Sonic LLC at the Department of Consumer and Regulatory Affairs.
This is a sample of licensing data; click here to access a complete history.
105
BuildZoom Score
212
Permits
- Building permit records show that Sonic LLC has worked on 212 permitted projects.
Sonic LLC Employees
CR
Christopher Robertson
Owner
GM
Gregory Mallus
Owner
GM
Gregory Nicholas Mallus
SL
Sonic Llc
Owner