Updated: May 17, 2026
Location and Projects
Address
541 W MONTGOMERY AVENUE, Rockville, MD, 20850
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Gannon Construction and Improvements
Gannon Construction and Improvements, 541 W Montgomery Ave, Rockville, MD (Owned by: Daniel E. Gannon) holds a Home Improvement license and 1 other license according to the Maryland license board.
Their BuildZoom score of 94 ranks in the top 24% of 58,058 Maryland licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Gannon Construction and Improvements, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Gannon Construction and Improvements Services
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Gannon Construction and Improvements Contact Information
Phone Number: (410) 444-1604
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Address: 541 W MONTGOMERY AVENUE, Rockville, MD 20850
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Gannon Construction and Improvements Rockville
Quality
94
76th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Gannon Construction and Improvements has a BuildZoom score of 94, which places them above 76% of 58,058 contractors in Maryland.
Activity
|
1 project
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Gannon Construction and Improvements has worked on at least
2.0 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.
Pricing
|
1 project
|
< $5k |
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.
Building Permits by Gannon Construction and Improvements
This is a sample of this contractor's permits. Click here to access their complete permit history.
Request for permit to install fence on property
Valuation:
$1,400
Permit #:
FENC-29767-2022
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install new deck with stairs
Valuation:
$20,000
Permit #:
DECK-29496-2022
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
6x9 front porch over existing concrete
Valuation:
N/A
Permit #:
2025-9475-ALT
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Request for electrical permit to (1) switched light for deck and (1) outlet for deck
Valuation:
$300
Permit #:
ELEC-29936-2023
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential building uses permit
1 story addition on a crawl space to make existing bedroom & kitchen larger as well as adding a new master bathroom. also doing a 16x20 deck|**revise to remove deck 6/11/10 scw**
Valuation:
$25,000
Permit #:
74336
Status:
issued
Fee:
N/A
Permit Type:
Addition
Building Type:
Single family dwe...
Residential single family dwelling (new addition alteration demolition accessory dwelling unit) perm
2013-10-28
Replace/repair balconies including decking & railings * replaced bowed posts *
Valuation:
$37,500
Permit #:
B02299254
Status:
complete
Fee:
$285
Permit Type:
N/A
Building Type:
N/A
Residential single family dwelling (new addition alteration demolition accessory dwelling unit) perm
2013-10-28
Replace/repair balconies including decking & railings * replaced bowed posts *
Valuation:
$37,500
Permit #:
B02299255
Status:
complete
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
Residential single family dwelling (new addition alteration demolition accessory dwelling unit) perm
2013-10-28
Replace/repair balconies including decking & railings * replaced bowed posts *
Valuation:
$37,500
Permit #:
B02299256
Status:
complete
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
Residential single family dwelling (new addition alteration demolition accessory dwelling unit) perm
2013-10-28
Replace/repair balconies including decking & railings * replaced bowed posts *
Valuation:
$37,500
Permit #:
B02299257
Status:
complete
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
Electrical work in pool house
Valuation:
$500
Permit #:
PI-E110130
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Gannon Construction and Improvements Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Gannon Construction and Improvements License info
Verified License
| License # | 66333 |
| Status | Active |
| State | Maryland |
| Type | Home Improvement |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Gannon Construction and Improvements at 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-F150962-1 |
| 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 Gannon Construction and Improvements at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
94
BuildZoom Score
Gannon Construction and Improvements Employees
DG
Daniel E. Gannon
Owner