Updated: Apr 21, 2026
Location and Projects
Address
Waldorf, MD, 20601
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David L Hahn Plumber
David L Hahn, Waldorf, MD holds a Plumbers license and 2 other licenses according to the Maryland license board.
Their BuildZoom score of 106 ranks in the top 7% of 58,058 Maryland licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring David L Hahn, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
David L Hahn Services
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David L Hahn Contact Information
Phone Number: (202) 421-5101
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David L Hahn Waldorf
Quality
106
93rd percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
David L Hahn has a BuildZoom score of 106, which places them above 93% of 58,058 contractors in Maryland.
Activity
|
2 projects
|
2026 |
|
25 projects
|
2025 |
|
11 projects
|
2024 |
|
12 projects
|
2023 |
Our building permit records indicate that David L Hahn has worked on at least
50.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Experience
|
8 projects
|
Home Additions |
|
3 projects
|
Commercial Renovations |
|
44 projects
|
Plumbing projects |
|
3 projects
|
Sewer laterals |
Analyzing permits over the last 4 years shows that David L Hahn mostly works on
plumbing project
and home addition
projects.
Pricing
|
7 projects
|
< $5k |
|
5 projects
|
$5k-$20k |
The typical size of their permits is approximately $4,000. This graph shows the distribution of these job values.
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Install a new water connection for existing home built in 1956. applicant to coordinate with department of public works for install of water tap for connection. please see disconnect permit from private well (pws-230266) please contact 301-645-0700 to schedule inspection
Valuation:
N/A
Permit #:
PWS-240135
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Gas test only
Valuation:
N/A
Permit #:
BRCM-25-004079
Status:
expired
Fee:
$52
Permit Type:
Interior trades only
Building Type:
N/A
Disconnect and cap the current well from the home. please see pws-230250 for home connecting to public water. please contact 301-645-0700 to schedule inspection
Valuation:
N/A
Permit #:
PWS-230266
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
The existing 64,207sf school building will be modernized including demolition, renovation and targeted additions to create a new single story building totaling 71,064sf to include classroom spaces, cafeteria, gymnasium, resource and storage spaces, administration offices and rooms to support building operations.
Valuation:
$20,700,000
Permit #:
PLBG-191736
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Relocate 1-washer box 1-new service sink relocate 1-kitchen sink 1-new ice maker relocate 1-dishwasher relocate 1-ice maker replace 2 hose bibs convert tub to shower/**6.13.24 amendment request to addition 2-toilets 2-lavs and 1 tub**
Valuation:
N/A
Permit #:
P24001581
Status:
complete
Fee:
$227
Permit Type:
N/A
Building Type:
N/A
1, 335 sf 1 stry. pool bathroom house (tallyn ridge hoa) community outdoor sports - recreation facility project #15959 revision 7/3/18 -submitted notes and plans per reviewer comments -dt revision 9/25/18 - to addition utility (lw)
Valuation:
$325,000
Permit #:
182318
Status:
complete
Fee:
N/A
Permit Type:
Plumbperm
Building Type:
N/A
Plumbing to include a bar sink utility sink toilet lavatory floor drain water cooler electric water heater and a water bubbler for interior renovations. morgan keller
Valuation:
N/A
Permit #:
2022-01844
Status:
complete
Fee:
$215
Permit Type:
N/A
Building Type:
N/A
Rough in -bldg a/p# 168358 construction of greenhouse for lettuce/vegatables growing under roof; greenhouse to occupy 39339 sf; process barn to occupy 12000 sf (replaces application for zoning cert 166728) revision 1/26/17 (km) - revised plans per agency plan review comments revision 2/19/18 (lw) - revised plans per agency plan review comments
Valuation:
$200,000
Permit #:
182968
Status:
complete
Fee:
N/A
Permit Type:
Plumbperm
Building Type:
N/A
Plumbing of 8 fixtures to comm-190246 (hagen-dazs). commercial alterations to an existing space. demolish of existing partitions and plumbing. new partitions finishes and equipment; new mechanical electrical and plumbing to associated spaces
Valuation:
$185,000
Permit #:
PLBG-191492
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Gas test only to make sure there are no leaks
Valuation:
N/A
Permit #:
BRCM-25-006375
Status:
complete
Fee:
$52
Permit Type:
Interior trades only
Building Type:
N/A
Backflow for comm-220353 - new waste line connections for new sinks/new hot and cold water line connections
Valuation:
N/A
Permit #:
BF-230145
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Plumbing permit for <span style="background-color: rgb(229 229 229);">change of use to outpatient clinic concerted care group (previously uppe
Valuation:
N/A
Permit #:
202205612
Status:
issued
Fee:
N/A
Permit Type:
plumbing
Building Type:
N/A
Manufacture home connecting to home (place 1988 swmh 2 bedrooms 1 full bathroom 0 half baths will have electric plumbing & hvacr)
Valuation:
N/A
Permit #:
202100599
Status:
issued
Fee:
N/A
Permit Type:
plumbing
Building Type:
N/A
Plumbing for toilet shower and sink in basement bathroom washing machine sink and refrigerator line for kitchenette fletcher's grove lot 63
Valuation:
N/A
Permit #:
2023-02812
Status:
complete
Fee:
$130
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel installing one toilet one lavy sink one shower and a wet bar- resd-230090
Valuation:
N/A
Permit #:
PLBG-230365
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Plumbing and gas for new tenant layout including kitchens restroom walk-ins and utility room
Valuation:
N/A
Permit #:
449928
Status:
complete
Fee:
$519
Permit Type:
Plumbperm
Building Type:
N/A
Bathroom and kitchen remodel
Valuation:
N/A
Permit #:
BRCM-25-007274
Status:
complete
Fee:
$172
Permit Type:
Interior trades only
Building Type:
N/A
Bathroom and kitchen remodel
Valuation:
N/A
Permit #:
BRCM-25-007274
Status:
complete
Fee:
$172
Permit Type:
Interior trades only
Building Type:
N/A
Cap off sewer and water line
Valuation:
N/A
Permit #:
BRCM-25-004597
Status:
complete
Fee:
$52
Permit Type:
Interior trades only
Building Type:
N/A
Plumbing & gas permit - residential
2024-12-19
Rough in plumbing for 1 toilet, 1 lavi, 1 tub connect waste line to outside existing house 4 sewer line resd-240729
Valuation:
N/A
Permit #:
PLBG-240897
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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120
BZ Score
-
Avg Project
-
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
David L Hahn License info
Verified License
| License # | 23342 |
| Status | Active |
| State | Maryland |
| Type | Plumbers |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for David L Hahn at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 1608 |
| Status | Active |
| City | Annapolis |
| Type | Plumbing Cont, Mpgf |
- When BuildZoom last verified this license, it had an expiration date of May, 2017. Check the current license status of David L Hahn with the The City of Annapolis, MD
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CON-1608 |
| Status | Inactive |
| City | Annapolis |
| Type | Plumbing Cont |
- According to the The City of Annapolis, MD, 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 David L Hahn at the The City of Annapolis, MD.
This is a sample of licensing data; click here to access a complete history.
106
BuildZoom Score
Insured
| Insurer | Harford |
2K
Permits
- Building permit records show that David L Hahn has worked on 1961 permitted projects.