Updated: May 19, 2026
Location and Projects
Address
11 RUSSELL AVE, Gaithersburg, MD, 20877
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O Neill Development Construction
O Neill Development LLC, 11 Russell Ave, Gaithersburg, MD (Owned by: Brendan Oneill) holds a Home Improvement license and 7 other licenses according to the Maryland license board.
Their BuildZoom score of 0 does not rank in the top 50% of Maryland contractors.
Their license was verified as active when we last checked. If you are thinking of hiring O Neill Development LLC, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
O Neill Development LLC Services
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O Neill Development LLC Contact Information
Phone Number: (717) 626-2228
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Address: 11 RUSSELL AVE, Gaithersburg, MD 20877
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Building Permits by O Neill Development LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Remodel & renovate exist'g 1½-story unconditioned garage/pool house to living space addition larger dormers (*see text*)
Valuation:
$300,000
Permit #:
15-406
Status:
complete
Fee:
$1,665
Permit Type:
Residence additio...
Building Type:
N/A
Renovations & additions (in 100 ft buffer) to 1½-story sfd;first floor: remodel portion of existing garage (*see text*)
Valuation:
$400,000
Permit #:
16-515
Status:
issued
Fee:
$2,185
Permit Type:
Residence additio...
Building Type:
N/A
Remodel & renovate exist'g 1½-story unconditioned garage/pool house to living space addition larger dormers (*see text*)
Valuation:
$300,000
Permit #:
15-406
Status:
complete
Fee:
$1,665
Permit Type:
Residence additio...
Building Type:
N/A
Renovations & additions (in 100 ft buffer) to 1½-story sfd;first floor: remodel portion of existing garage (*see text*)
Valuation:
$400,000
Permit #:
16-515
Status:
issued
Fee:
$2,185
Permit Type:
Residence additio...
Building Type:
N/A
Remove existing 1-story master bedroom suite addition andreplace with a 1½-story master bedroom suite (*see text*)
Valuation:
$700,000
Permit #:
15-405
Status:
complete
Fee:
$3,825
Permit Type:
Residence additio...
Building Type:
N/A
Remove existing 1-story master bedroom suite addition andreplace with a 1½-story master bedroom suite (*see text*)
Valuation:
$700,000
Permit #:
15-405
Status:
complete
Fee:
$3,825
Permit Type:
Residence additio...
Building Type:
N/A
Request for permit to cover an already constructed shed on property
Valuation:
$1,000
Permit #:
SHED-12898-2016
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Request for permit to cover an already installed fence on property
Valuation:
$500
Permit #:
FENC-12897-2016
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Convert exist’g 2nd floor bathroom to 53 sq ft nook; convertpart of 2nd floor master bedroom to a 105 sq ft master bathroom
Valuation:
$50,000
Permit #:
15-080
Status:
complete
Fee:
$355
Permit Type:
Residence additio...
Building Type:
N/A
Convert exist’g 2nd floor bathroom to 53 sq ft nook; convertpart of 2nd floor master bedroom to a 105 sq ft master bathroom
Valuation:
$50,000
Permit #:
15-080
Status:
complete
Fee:
$355
Permit Type:
Residence additio...
Building Type:
N/A
Completion of 3 story single family residence with 1st & 2ndflr screened porches entry porch & unheated basement
Valuation:
$5,000
Permit #:
09-067
Status:
issued
Fee:
$40
Permit Type:
Residence additio...
Building Type:
N/A
Completion of 3 story single family residence with 1st & 2ndflr screened porches entry porch & unheated basement
Valuation:
$5,000
Permit #:
09-067
Status:
issued
Fee:
$40
Permit Type:
Residence additio...
Building Type:
N/A
Master bedroom & porch additions
Valuation:
$60,000
Permit #:
08-490
Status:
filed
Fee:
$345
Permit Type:
Residence additio...
Building Type:
N/A
Master bedroom & porch additions
Valuation:
$60,000
Permit #:
08-490
Status:
filed
Fee:
$345
Permit Type:
Residence additio...
Building Type:
N/A
Construct rear deck
Valuation:
$7,000
Permit #:
B02111530
Status:
canceled
Fee:
$80
Permit Type:
N/A
Building Type:
N/A
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O Neill Development LLC Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
O Neill Development LLC License info
Verified License
| License # | 101520 |
| Status | Active |
| State | Maryland |
| Type | Home Improvement |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for O Neill Development LLC 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 # | 25099 |
| Status | Active |
| State | Pennsylvania |
| Type | Contractor Corp Part |
- When BuildZoom last verified this license, it had an expiration date of June, 2015. Check the current license status of O Neill Development 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 # | 101520 |
| Status | Active |
| State | Pennsylvania |
| Type | Contractor, Inc Provides Design And Building Services For New Single Family Residences, Additions To Existing Residences And Remodeling For Single Family Residences Our Firm Builds Multifa, Townhomes And Apartment Buildings We Also Construct Light Commerc |
- When BuildZoom last verified this license, it had an expiration date of April, 2016. Check the current license status of O Neill Development 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 # | 128128 |
| Status | Active |
| State | Maryland |
| Type | Contractor (Corppart) Home Improvement |
- When BuildZoom last verified this license, it had an expiration date of April, 2016. Check the current license status of O Neill Development LLC with 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 # | 68004984 |
| Status | Active |
| City | District Of Columbia |
| Type | Home Improvement Contractor |
- When BuildZoom last verified this license, it had an expiration date of July, 2016. Check the current license status of O Neill Development LLC with the Department of Consumer and Regulatory Affairs
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 25100 |
| Status | Active |
| State | Maryland |
| Type | Contractor Home Improvement |
- When BuildZoom last verified this license, it had an expiration date of June, 2015. Check the current license status of O Neill Development LLC with 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 # | 25099 |
| Status | Active |
| State | Maryland |
| Type | Contractor (Corppart) Home Improvement |
- When BuildZoom last verified this license, it had an expiration date of June, 2015. Check the current license status of O Neill Development 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 # | NAT-39762-2 |
| Status | Inactive |
| Nation | Environmental Protection Agency |
| Type | Renovation |
- According to the United States Environmental Protection Agency, 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 O Neill Development LLC at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
- How the BuildZoom Score works
- *No active license on file. If you are O Neill Development LLC, click “This is My Business” to update your information.
6
Permits
- Building permit records show that O Neill Development LLC has worked on 6 permitted projects.
O Neill Development LLC Employees
BO
Brendan Oneill
Owner
BO
Brendan Thorpe Oneill
Owner
OC
O Neill Development Corporation
Owner
OL
Oneill Development Llc
Owner