Updated: May 14, 2026
Location and Projects
Address
5375 CLAYTON ROAD, Concord, CA, 94521
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Knoll Systems Corporation HVAC/Mechanical Contractor
Knoll Systems Corporation at 5375 CLAYTON ROAD, Concord, CA 94521, held a HVAC/Mechanical Contractor license (#784349) with the California contractors license board with an expiration date of 09-30-2008. We last verified the license was expired on 05-13-2026.
Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 336,931 California contractors.
If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our project planner to be easily matched to qualified, licensed professionals in your area.
Knoll Systems Corporation Contact Information
Phone Number: (925) 681-0477
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Address: 5375 CLAYTON ROAD, Concord, CA 94521
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Building Permits by Knoll Systems Corporation
This is a sample of this contractor's permits. Click here to access their complete permit history.
Mechanical replace furnace in crawl space. note: this must comply with the requirements as specified on attached figure 709 re: mechanical code sections 504, 509 & 709. ok per ken. (rgs)
Valuation:
N/A
Permit #:
BLD2003-03122
Status:
final
Fee:
$74
Permit Type:
N/A
Building Type:
N/A
New furnace 70, 000 btu to be installed in attic new gas and electric lines and 7 new reg and one air return for all new duct work
Valuation:
$7,300
Permit #:
MEC2006-00007
Status:
final
Fee:
$258
Permit Type:
N/A
Building Type:
N/A
Permit renewal for furnace/ac
Valuation:
N/A
Permit #:
M1407-002
Status:
final
Fee:
$60
Permit Type:
Alter-sfd
Building Type:
N/A
Replacement furnace in attic new flue pipe install carrier 2/stage 2/speed furnace model#58ctx090-16 -
Valuation:
$7,100
Permit #:
MEC2005-00099
Status:
final
Fee:
$164
Permit Type:
N/A
Building Type:
N/A
Replace furnace 70k addition on air conditioning 3 ton. 40 amp disconnect knoll systems corp renewed bl 7/20/06
Valuation:
N/A
Permit #:
06070136
Status:
final
Fee:
$281
Permit Type:
N/A
Building Type:
N/A
Unit c : install one forced air furnace with 6 supply and 1 return - two 150k btu unit heaters
Valuation:
$12,044
Permit #:
MEC2005-00123
Status:
final
Fee:
$595
Permit Type:
N/A
Building Type:
N/A
R&r furnace in same location and addition air conditioning. condenser to conform to setbacks
Valuation:
N/A
Permit #:
2004 113684 RS
Status:
final
Fee:
N/A
Permit Type:
Single family
Building Type:
N/A
R/r air conditioning (condenser to be installed in same location) and r/r furnace (fau)
Valuation:
$0
Permit #:
2002 056470 RS
Status:
Finaled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace furnace 90k addition on air conditioning 4 ton coil disconnect circuit for air conditioning
Valuation:
N/A
Permit #:
06060228
Status:
final
Fee:
$176
Permit Type:
N/A
Building Type:
N/A
Mech- adding new furnace unit up to 70, 000 btu in the attic including electrical fixtures. construction involved.(tj)
Valuation:
N/A
Permit #:
BLD2006-05532
Status:
final
Fee:
$338
Permit Type:
N/A
Building Type:
N/A
R&r furnace in same location & addition air conditioning. condenser to conform to setbacks
Valuation:
N/A
Permit #:
2004 113687 RS
Status:
final
Fee:
N/A
Permit Type:
Single family
Building Type:
N/A
Install a new air conditioning unit at the rear fenced patio per avril pernia(planner)
Valuation:
N/A
Permit #:
2003 101709 MF
Status:
final
Fee:
N/A
Permit Type:
Apt/condo/townhouse
Building Type:
N/A
Remove and replace furnace and addition air conditioning and duct work
Valuation:
$12,528
Permit #:
BLD2005-01001
Status:
final
Fee:
$317
Permit Type:
N/A
Building Type:
N/A
Install new furnace in attic - new air conditioning unit - all new duct work
Valuation:
$14,680
Permit #:
MEC2006-00013
Status:
final
Fee:
$394
Permit Type:
N/A
Building Type:
N/A
20amp breaker for a replacement of a gravity furnace to a force air unit run aprox 30 from braker to unit garage
Valuation:
N/A
Permit #:
E200409037111
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install central heat in attic duct work dedicated circuit
Valuation:
$5,000
Permit #:
MEC2004-00087
Status:
final
Fee:
$253
Permit Type:
N/A
Building Type:
N/A
Replace furnace 70k add an a/c 2 ton unit and a 20amp circuit
Valuation:
$0
Permit #:
BI-2005-1424
Status:
issued
Fee:
$58
Permit Type:
N/A
Building Type:
N/A
Add-on air conditioning 5ton side-yard pre-prepped @ time of constr
Valuation:
N/A
Permit #:
2004 120449 RS
Status:
final
Fee:
N/A
Permit Type:
Single family
Building Type:
N/A
R/r existing 70kbtu furnace at same location and addition air conditioning
Valuation:
N/A
Permit #:
2003 115355 RS
Status:
final
Fee:
N/A
Permit Type:
Single family
Building Type:
N/A
Replace furnace in closet carrier 58ctx070108 70, 000 btu
Valuation:
$2,588
Permit #:
MEC2005-00033
Status:
final
Fee:
$167
Permit Type:
N/A
Building Type:
N/A
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Knoll Systems Corporation License info
Inactive License
| License # | 784349 |
| Status | Inactive |
| State | California |
| Type | Warm Air Heating, Ventilating And Air Conditioning |
| Business Type | Corporation |
- According to the California Contractors State License Board, 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 Knoll Systems Corporation at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 849308 |
| Status | Inactive |
| State | California |
| Type | Warm Air Heating, Ventilating And Air Conditioning |
| Business Type | Corporation |
- According to the California Contractors State License Board, 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 Knoll Systems Corporation at the California Contractors State License Board.
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 Knoll Systems Corporation, click “This is My Business” to update your information.
Bonded
| Bonded Agent | This License Filed A Contractor's Bond With |
| Bond Value | $10,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
228
Permits
- Building permit records show that Knoll Systems Corporation has worked on 228 permitted projects.
Knoll Systems Corporation Employees
DA
Daniel Joulfred Alvarez
Rmo
RV
Rosa Elena Valderrama
Ceo / President