Updated: May 11, 2026
Location and Projects
Address
4344 MISSION BLVD, Montclair, CA, 91763
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John L Conley Construction
Founded in 1946 by John Conley, John L Conley Inc in Montclair, California has become a leading national manufacturer of custom greenhouses. Originating as a small welding shop, the company has expanded to serve commercial, educational, and research clients across the country. Their specialty products include the Gable 7500, designed for maximum strength and comprehensive customization, and the Cold Frame 1200, known for its roll-form arch construction, double-bolted purlins, and efficient shipping features. Conley’s greenhouses are engineered to endure demanding environmental conditions, highlighting durable steel materials and robust connections. The company offers tailored greenhouse design and aims to support agricultural, institutional, and research projects with structures built for longevity and performance.
John L Conley Inc Services
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John L Conley Inc Contact Information
Phone Number: (909) 627-0981
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Address: 4344 MISSION BLVD, Montclair, CA 91763
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Cross street:rice canyon activity code:42rp11 42r111 description of work: 273936 sq ft commercial greenhouses --------------------------- 7/2/01: this plan check abandoned (never issued). plan check expired. see packet for 1001-20010687 for abandonement letter.(1sdg)
Valuation:
$1,164,228
Permit #:
PDS1999-1021-99000086
Status:
withdrawn
Fee:
$6,630
Permit Type:
N/A
Building Type:
N/A
Cross street:rice canyon activity code:42rp11 42r111 description of work: 273936 sq ft commercial greenhouses i got the wrong plan check number for this type of case. it should be otc commercial (1021) instead of log in(1017). (ccc) ---------------- 7/2/01: this plan check should have been changed to a 1021. see genealogy--as the 1021 for this project was initiated and subsequently is... see more
Valuation:
N/A
Permit #:
PDS1999-1017-99000114
Status:
withdrawn
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Log in cross street: melrose drdescription of work: 4800 sq ft commercial agricultural packing shednote: agency letter to be re-done...use areas of other types for rewrite...see mario for instructions...m1a 9/14/01
Valuation:
$0
Permit #:
PDS2001-1017-20010183
Status:
PC Expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Cross street: melrose dr description of work: 4800 sq ft commercial agricultural packing shed note: agency letter to be re-done...use areas of other types for rewrite...see mario for instructions...m1a 9/14/01
Valuation:
$130,560
Permit #:
PDS2002-1019-20020021
Status:
complete
Fee:
$2,295
Permit Type:
N/A
Building Type:
N/A
New residential detached accessory structure - plan check-permit
2000-03-15
Log in cross street: guajome lake rddescription of work:116, 964 sq ft commercial greenhouses structures only. no plumbing , electrical or mechanical work to be done with this permit
Valuation:
$0
Permit #:
PDS2000-1017-20000042
Status:
PC Expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New residential detached accessory structure - plan check-permit
2000-05-05
Cross street: guajome lake rd description of work:116, 964 sq ft commercial greenhouses structures only. no plumbing , electrical or mechanical work to be done with this permit
Valuation:
$497,097
Permit #:
PDS2000-1019-20000084
Status:
complete
Fee:
$2,158
Permit Type:
N/A
Building Type:
N/A
Cross street: melrose drdescription of work: 2nd greenhouse on lot - comml nursery suppl upgrd to 400amps 3-23-94 ; temp power added 4-15-94 jwm
Valuation:
$0
Permit #:
PDS1994-C-94001371
Status:
Completed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Cross street: melrose drdescription of work: 2nd greenhouse on lot - comml nursery suppl upgrd to 400amps 3-23-94 ; temp power added 4-15-94 jwm
Valuation:
$0
Permit #:
PDS1994-C-9400137999
Status:
Completed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New residential detached accessory structure - plan check-permit
1992-04-27
Cross street: cole grade rd description of work: commercial greenhse and shade stucture accessory to exist single family dwelling otc (no electrical no mechanical no plumbing)
Valuation:
$3,810,024
Permit #:
PDS1992-A-9200718999
Status:
complete
Fee:
$6,402
Permit Type:
N/A
Building Type:
N/A
Commercial detached accessory structure - plan check-permit
2000-09-26
Cross street:ammunition rd description of work:10368 sq. ft. wholesale green house (144 x 72') w/electrical 400 amp 3 phase service
Valuation:
$152,928
Permit #:
PDS2000-1017-20000132
Status:
triage
Fee:
$606
Permit Type:
N/A
Building Type:
N/A
Office: km cross street: guajome lake rd description of work: 28000 sq ft commercial greenhouse. existing greenhouse to be removed
Valuation:
$413,000
Permit #:
PDS2003-1021-20030090
Status:
complete
Fee:
$3,582
Permit Type:
N/A
Building Type:
N/A
New primary commercial structure - plan check-permit
2000-11-06
Cross street:ammunition rddescription of work:10368 sq. ft. wholesale green house (144 x 72') w/electrical 400 amp 3 phase service
Valuation:
$0
Permit #:
PDS2000-1019-20000190
Status:
Completed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Commercial alteration or addition - plan check-permit
1999-02-03
Cross street: 2ndactivity code: 42cp06/42c106description of work: commerical greenhouse with gas line for water boilers
Valuation:
$0
Permit #:
PDS1999-1021-99000025
Status:
Completed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New primary commercial structure - plan check-permit
1999-03-29
Cross street:marilyn lane activity code:42rp11 42r111 description of work: 21000 sq ft commercial greenhouses
Valuation:
$89,250
Permit #:
PDS1999-1017-99000085
Status:
triage
Fee:
$445
Permit Type:
N/A
Building Type:
N/A
Cross street: melrose drdescription of work: greenhouse for comml nursery addition gas line and 2 boilers3/30/94
Valuation:
$0
Permit #:
PDS1994-C-9400135999
Status:
Completed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Cross street: melrose drdescription of work: greenhouse for comml nursery addition gas line and 2 boilers3/30/94
Valuation:
$0
Permit #:
PDS1994-C-94001351
Status:
Completed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Cross street: melrose drdescription of work: ag building (warehouse for plants) misc electrical added 8-12-96
Valuation:
$0
Permit #:
PDS1996-C-95039971
Status:
Completed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Cross street: melrose dr description of work: ag building (warehouse for plants) misc electrical added 8-12-96
Valuation:
$70,800
Permit #:
PDS1995-A-9500692999
Status:
complete
Fee:
$389
Permit Type:
N/A
Building Type:
N/A
New residential detached accessory structure - plan check-permit
1994-08-02
Cross street: lilac ridge description of work: greenhouse, suppl for plumbing and heating 12-20-94
Valuation:
$17,136
Permit #:
PDS1994-C-94020331
Status:
complete
Fee:
$693
Permit Type:
N/A
Building Type:
N/A
New residential detached accessory structure - plan check-permit
1994-08-02
Cross street: lilac ridge description of work: greenhouse, suppl for plumbing and heating 12-20-94
Valuation:
$17,136
Permit #:
PDS1994-C-9402033999
Status:
complete
Fee:
$132
Permit Type:
N/A
Building Type:
N/A
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John L Conley Inc License info
Verified License
| License # | 475686 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for John L Conley Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 323391 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for John L Conley 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 # | 483834 |
| 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 John L Conley Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
96
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Twin City Fire Insurance Company |
15
Permits
- Building permit records show that John L Conley Inc has worked on 15 permitted projects.
John L Conley Inc Employees
DC
Daniel Dewie Conley
Rmo / Ceo / Pres
DC
David Lynn Conley
Rmo / Ceo / Pres
GE
George Frederick Ten Eyck
Officer
HD
Howard Lemuel Davis
Officer
JC
Jeffrey Travis Conley
Officer
JC
John Louis Conley
Officer
RJ
Russell Scott Jorgenson
Officer
TC
Thomas Louis Conley
Ceo / President