Updated: May 30, 2026
Location and Projects
Address
Marriottsville, MD, 21104
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Lederer , John Dudley HVAC/Mechanical Contractor
Lederer , John Dudley, Marriotsville, MD (Owned by: John Dudley Lederer) holds a Heating, Ventilation, Air Conditioning And Refrigeration license and 3 other licenses according to the Maryland license board.
Their BuildZoom score of 102 ranks in the top 11% of 58,058 Maryland licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Lederer , John Dudley, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Lederer , John Dudley Contact Information
Phone Number: (410) 269-6589
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Lederer , John Dudley Marriotsville
Quality
102
89th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Lederer , John Dudley has a BuildZoom score of 102, which places them above 89% of 58,058 contractors in Maryland.
Activity
|
1 project
|
2024 |
|
3 projects
|
2023 |
Our building permit records indicate that Lederer , John Dudley has worked on at least
4.0 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
|
3 projects
|
Mechanical projects |
|
3 projects
|
HVAC projects |
Analyzing permits over the last 4 years shows that Lederer , John Dudley mostly works on
hvac project
and mechanical project
projects.
Pricing
|
1 project
|
$100k-$250k |
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.
Lederer , John Dudley Reviews
5 out of 5 stars, based on
2
reviews
-
By MichaelAugust 3, 2017Verified Hire
-
By FredAugust 3, 2017Verified Hire
I worked with John Lederer and his company Frosty Refrigeration. They're the best around. As a retired architect, who has worked with many such companies, there are none better than them.
Building Permits by Lederer , John Dudley
This is a sample of this contractor's permits. Click here to access their complete permit history.
New intall ductwork electric heat pump
Valuation:
N/A
Permit #:
MEC22-0447
Status:
final
Fee:
$434
Permit Type:
New building - re...
Building Type:
N/A
Replace exsiting electric air conditioning gas elecr heating
Valuation:
N/A
Permit #:
MEC22-0513
Status:
issued
Fee:
$200
Permit Type:
Existing building...
Building Type:
N/A
Replace existing electrical. air conditioning heating
Valuation:
N/A
Permit #:
MEC22-0048
Status:
issued
Fee:
$167
Permit Type:
Existing building...
Building Type:
N/A
Replace exisiting electric air conditioning
Valuation:
N/A
Permit #:
MEC22-0569
Status:
final
Fee:
$255
Permit Type:
Existing building...
Building Type:
N/A
Replace existing air conditioning
Valuation:
N/A
Permit #:
MEC22-0609
Status:
issued
Fee:
$202
Permit Type:
Existing building...
Building Type:
N/A
Replace existing electric heat pump
Valuation:
N/A
Permit #:
MEC22-0294
Status:
issued
Fee:
$196
Permit Type:
Existing building...
Building Type:
N/A
Replace existing electric air conditioning gas heating
Valuation:
N/A
Permit #:
MEC20-0488
Status:
final
Fee:
$199
Permit Type:
Existing building...
Building Type:
N/A
Replace (2) hvac condenser units & install a 3rd unit
Valuation:
N/A
Permit #:
MEC20-0349
Status:
final
Fee:
$868
Permit Type:
Existing building...
Building Type:
N/A
Replace extng. heatpump
Valuation:
N/A
Permit #:
MEC22-0047
Status:
issued
Fee:
$166
Permit Type:
Existing building...
Building Type:
N/A
Replace existing lectric air conditioning heating
Valuation:
N/A
Permit #:
MEC21-0698
Status:
issued
Fee:
$150
Permit Type:
Existing building...
Building Type:
N/A
Replace existing electric air conditioning heating
Valuation:
N/A
Permit #:
MEC21-0536
Status:
issued
Fee:
$164
Permit Type:
Existing building...
Building Type:
N/A
New install electric air conditioning and heating
Valuation:
N/A
Permit #:
MEC19-0560
Status:
final
Fee:
$125
Permit Type:
Existing building...
Building Type:
N/A
Replace existing air conditioning heating
Valuation:
N/A
Permit #:
MEC20-0279
Status:
issued
Fee:
$150
Permit Type:
Existing building...
Building Type:
N/A
Alteration- basement mechanical equipment
Valuation:
$125,000
Permit #:
BLD22-0730
Status:
issued
Fee:
$1,495
Permit Type:
Residential
Building Type:
N/A
Replacing existing electric air conditioning unit
Valuation:
N/A
Permit #:
MEC18-0467
Status:
final
Fee:
$392
Permit Type:
Existing building...
Building Type:
N/A
Replace 1-3ton 36k btu heat pump with same
Valuation:
N/A
Permit #:
MEC18-0572
Status:
final
Fee:
$125
Permit Type:
Existing building...
Building Type:
N/A
Ducktwork modification for kitchen alteration
Valuation:
N/A
Permit #:
MEC17-0247
Status:
final
Fee:
$125
Permit Type:
Existing building...
Building Type:
N/A
Replacing existing electric air conditioning and existing gas heating
Valuation:
N/A
Permit #:
MEC18-0058
Status:
final
Fee:
$202
Permit Type:
Existing building...
Building Type:
N/A
Replacing existing electric air conditioning and existing gas heating
Valuation:
N/A
Permit #:
MEC18-0058
Status:
final
Fee:
$202
Permit Type:
Existing building...
Building Type:
N/A
Replacing (1) existing oil heating unit
Valuation:
N/A
Permit #:
MEC18-0599
Status:
final
Fee:
$125
Permit Type:
Existing building...
Building Type:
N/A
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BZ Score
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Verified License
BuildZoom confirmed this contractor's license
Lederer , John Dudley License info
Verified License
| License # | 16822 |
| Status | Active |
| State | Maryland |
| Type | Heating, Ventilation, Air Conditioning And Refrigeration |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Lederer , John Dudley 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
| Status | Active |
| City | Annapolis |
| Type | Mech Cont, Master |
- When BuildZoom last verified this license, it had an expiration date of August, 2015. Check the current license status of Lederer , John Dudley 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-4647 |
| Status | Inactive |
| City | Annapolis |
- 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 Lederer , John Dudley at the The City of Annapolis, MD.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CON-287 |
| Status | Inactive |
| City | Annapolis |
| Type | Mech 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 Lederer , John Dudley at the The City of Annapolis, MD.
This is a sample of licensing data; click here to access a complete history.
102
BuildZoom Score
98
Permits
- Building permit records show that Lederer , John Dudley has worked on 98 permitted projects.
Lederer , John Dudley Employees
JL
John Dudley Lederer
Owner
John is the best in the area. Highly recommended. We will use him during our next renovation.