Updated: Apr 19, 2026
Location and Projects
Address
115 MASON CIRCLE STE B, Concord, CA, 94520
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Matrix Hg Plumber
Matrix Hg Inc, 115 Mason Cir, Concord, CA (Employees: Arthur Dana Hoover, Daniel Bryan Greeson, and Matthew Michael Stimson) holds a Warm Air Heating, Ventilating And Air Conditioning, Electrical, Plumbing, General Building, Refrigeration, Sheet Metal, Boiler, Hot Water Heating And Steam Fitting license and 1 other license according to the California license board.
Their BuildZoom score of 114 ranks in the top 2% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Matrix Hg Inc, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Matrix Hg Inc Services
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Matrix Hg Inc Contact Information
Phone Number: (925) 459-9200
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Address: 115 MASON CIRCLE STE B, Concord, CA 94520
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Matrix Hg Inc Concord
Quality
114
98th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Matrix Hg Inc has a BuildZoom score of 114, which places them above 98% of 336,931 contractors in California.
Activity
|
44 projects
|
2025 |
|
45 projects
|
2024 |
|
62 projects
|
2023 |
Our building permit records indicate that Matrix Hg Inc has worked on at least
151.0 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
|
19 projects
|
Commercial Renovations |
|
11 projects
|
New Constructions |
|
6 projects
|
Home Additions |
|
80 projects
|
Plumbing projects |
Analyzing permits over the last 4 years shows that Matrix Hg Inc mostly works on
plumbing project
and commercial renovation
projects.
Pricing
|
5 projects
|
< $5k |
|
14 projects
|
$5k-$20k |
|
20 projects
|
$20k-$50k |
|
10 projects
|
$50k-$100k |
|
19 projects
|
$100k-$250k |
|
3 projects
|
$250k-$500k |
|
4 projects
|
$500k-$1mil |
|
3 projects
|
$1mil+ |
The typical size of their permits is approximately $50,000. 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.
Basement: replace 1) 250 ton chiller install ref nonitor device install new sf & ef fansf for ref ventilation new ufds for e) pumps rework electrical for chiller & pumps new electrical for fans & ref. monitor chiller in basement
Valuation:
$250,000
Permit #:
202501289178
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
Basement - installation of a new cooling coil in (e) air handler; installation of 3 (n) condensing units each; installation of 6 (n) exv's for cus & coils; install refrigerant pipe for cu/exv/coils; pour concrete pads for condensing units
Valuation:
$103,000
Permit #:
202503202623
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
05 - food/beverag...
Suite 2300 ref pa 2025-0402-3549 relocate (e) low pressure ductwork and air distribution to match now tenant improvement layout. install new transfer fan for it closet. relocate thermostats as needed to accommodate new tenant improvement layout. install one new vav and associated low pressure ductwork and air distribution
Valuation:
$63,694
Permit #:
202505287335
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
Master plan check/not for issuance: like-for-like replacement of five rooftop packaged heat pumps. the new units are lighter and quieter than the existing units. the units are hidden behind a parapet wall and are not visible from anywhere outside of the property line. note: separate permits are required for building. a building. b and building. c upon master plan approval
Valuation:
$37,000
Permit #:
BLD2025-03955
Status:
master plan approval
Fee:
$1,921
Permit Type:
Heating and/or ai...
Building Type:
N/A
Ground fl - replace (e) mechanical system serving the plaza level tenant space bar sprezzatura. relocate heat pumps to permanent locations on ground fl; connect plaza level return to the heat pump units. unit not in the restaurant
Valuation:
$352,749
Permit #:
202409241446
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
05 - food/beverag...
Work category: 5m; replacement of coils in an air handler that serves a 1st floor restaurant. the equipment is in a basement mechanical room. demolish two existing hydronic cooling coils. install two new dx cooling coils. install three condensing units in a basement mechanical room. pipe refrigerant pipe to condensing units exvs and cooling coils
Valuation:
N/A
Permit #:
PMW20250429892
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
1st/fl- ref 202410243671- hvac modifications to support interior tenant improvements (n) grills registers diffusrs and ductwork. install 1 (n) exhaust fan
Valuation:
$168,000
Permit #:
202502039530
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
Work category: 5p; furnish & install waste vents &cw/hw piping which includes the installation of: water closets urinals lavatories drinking fountain break room sink and backflow preventers for applicable appliances
Valuation:
N/A
Permit #:
PW20250127614
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Like-for-like replacement of two rooftop packaged gas pack air conditioning units. the units are lighter and quieter than the existing units. the units are hidden behind a parapet wall and are not visible from outside of the property line
Valuation:
$66,000
Permit #:
BLD2025-03796
Status:
issued
Fee:
$3,310
Permit Type:
Heating and/or ai...
Building Type:
N/A
Hvac modifications to support interior tenant improvement. all other terminal units are existing to remain. (e) central equipment existing to remain. (e) pneumatic controls to remain. ref pa 202503061735
Valuation:
$10,000
Permit #:
202503212740
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
Replacement of (4) rooftop packaged air conditioning gas heat units and (2) mini split fan coil condensing unit systems. the (4) new air conditioning units will be heat pumps and will eliminate the gas heating. the units are not visible from anywhere outside of the property line. the new units are quieter than the existing units. there is no additional electrical load or gas load to ... see more
Valuation:
$116,000
Permit #:
2024 110538 CI
Status:
issued
Fee:
$2,891
Permit Type:
Bank
Building Type:
N/A
Replace (e) trane 10-ton cooling only package unit with new trane 10-tom. package unit and reconnect to existing ductwork and electrical. no work in the interior of the building
Valuation:
$35,524
Permit #:
202507019866
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
Work category: 5p; furnish & install waste vents & cw/hw piping which includes installation of: (5) water closets (1) urinal (3) floor drains w trap primers (4) lavatories and (1) drinking fountain
Valuation:
N/A
Permit #:
PW20241230024
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 5p; furnish & install waste vent domestic cold water piping for breakroom area which includes: (1) dual sink (2) faucets (1) garbage disposer and (1) refrigerator wall box
Valuation:
N/A
Permit #:
PW20250116386
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Hvac tenant improvement install new ater source heat pump install ceiling plunum mounted exhaust fan install carbon dioxide sensor. convert e control system to ddc. provide air balancer. base building hvac system remains unchanged
Valuation:
$149,417
Permit #:
202302021258
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
27/f: tenant improvement using the (e) base building hvac system. modifications to the air distribution system in the tenant space to suit architectural renovations including installation of new vav boxes and installation of new ductwork no new fire smoke dampers required. building permit# 202310259410
Valuation:
$69,848
Permit #:
202401123873
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
27th fl tenant improvement using base building hvac system. modifications to air distribution system in tenant space to suite arch renovations includidng installation of water source heat pump and associated ductwork. no new fire smoke dampers required. ref 202401123873 and 202310259410
Valuation:
$45,000
Permit #:
202402236411
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
Replacement of (e) flue stack serving (e) heating boiler and domestic hot water heater at the school of education building. provide new inline draft fan for flue stack
Valuation:
$100,000
Permit #:
202510237965
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
45 - school
Remove and replace existing 6 febco dcda backflow assembly back of building. no pedestrian or right of way impact. provide and install new 6 wilkins 350astdcdar backflow assembly with tamper switches. will re-use existing tamper switches and/or customer to provide electrician to install new tamper switches. test and certify new device and restore water to system
Valuation:
$17,144
Permit #:
F24-0215
Status:
approved
Fee:
$518
Permit Type:
N/A
Building Type:
N/A
Work category: 5p; backflow assembly permit: furnish & install (2) backflow preventers in storage room and (1) backflow preventer in irrigation control room
Valuation:
N/A
Permit #:
PW20250423763
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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BZ Score
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Avg Project
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BZ Score
$25K
Avg Project
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Projects
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BZ Score
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Avg Project
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Projects
Matrix Hg Inc Reviews
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Verified License
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Matrix Hg Inc License info
Verified License
| License # | 812232 |
| Status | Active |
| State | California |
| Type | Warm Air Heating, Ventilating And Air Conditioning, Electrical, Plumbing, General Building, Refrigeration, Sheet Metal, Boiler, Hot Water Heating And Steam Fitting |
| Business Type | Corporation |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Matrix Hg Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 965856 |
| Status | Inactive |
| State | California |
| Type | General Building |
| 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 Matrix Hg Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
114
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Hartford Fire Insurance Company |
529
Permits
- Building permit records show that Matrix Hg Inc has worked on 529 permitted projects.
Matrix Hg Inc Employees
AH
Arthur Dana Hoover
Ceo / President
DG
Daniel Bryan Greeson
Rmo
MS
Matthew Michael Stimson
Officer