Updated: Jul 03, 2026
Location and Projects
Address
10328 el centro rd, Fontana, CA, 92334
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Guasti Construction Solar Contractor
Guasti Construction Inc, 10328 El Centro Rd, Oak Hills, CA (Employees: James Reno Guasti and Joseph Anthony Guastadisegni) holds a General Building, Solar license and 2 other licenses according to the California license board.
Their BuildZoom score of 111 ranks in the top 4% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Guasti Construction Inc, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Guasti Construction Inc Contact Information
Phone Number: (760) 949-0480
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Address: 10328 el centro rd, Oak Hills, CA 92334
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Guasti Construction Inc Oak Hills
Quality
111
96th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Guasti Construction Inc has a BuildZoom score of 111, which places them above 96% of 336,931 contractors in California.
Activity
|
4 projects
|
2025 |
|
12 projects
|
2024 |
|
15 projects
|
2023 |
Our building permit records indicate that Guasti Construction Inc has worked on at least
31.0 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
|
4 projects
|
New Constructions |
|
28 projects
|
Solar installations |
Analyzing permits over the last 4 years shows that Guasti Construction Inc mostly works on
solar installation
and new construction
projects.
Pricing
|
5 projects
|
< $5k |
|
6 projects
|
$5k-$20k |
|
7 projects
|
$20k-$50k |
|
1 project
|
$100k-$250k |
|
2 projects
|
$250k-$500k |
The typical size of their permits is approximately $18,500. 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.
Building Permits by Guasti Construction Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Adding/installing a12 kw roof mounted solar system to include: 30 panels canadian solar cs3n400ms 400 watts. 30 enphase iq8plus72-m-us (240v). we are reducing the main panel to 175 amps wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
N/A
Permit #:
2025-007
Status:
issued
Fee:
$434
Permit Type:
Solar stock plan
Building Type:
N/A
Residential dwelling (brs) - single family dwelling - single family detached dwelling
2024-01-24
For expired brs2200585. new 2 story single family dwelling with (decks & solar)
Valuation:
$259,099
Permit #:
BRS2400074
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Roof mounted solar installation with 21 cs6r400 ms-hl blk solar panels 21 iq8plus -72-m-us (240v) micro inverters with 1 tesla powerwall battery. panel upgrade to 200 amps is removed from permit. rr wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
$21,000
Permit #:
2023-2824
Status:
final
Fee:
$435
Permit Type:
Panel upgrade and...
Building Type:
N/A
**needing permit and approved plans as soon as possible to coordinate disconnect/reconnect inspection the day of edison's panel upgrade of 06/12/2024 @ 7:30am** roof mounted solar installation with 20 canadian solar cs3n400ms-blk solar panels and 20 enphase iq8+72-m-us (240v) micro inverters with 1 tesla powerwall 3 battery and a panel upgrade from 100-225 amps. thank you~ wmp req'd s... see more
Valuation:
N/A
Permit #:
2024-1158
Status:
final
Fee:
$798
Permit Type:
Panel upgrade and...
Building Type:
N/A
Panel upgrade to 200 amps. removing panel upgrade from permit # 2023-2824. panel upgrade date tomorrow 12/20/23 with sce. spoke with patrick carrol and need this reviewed and approved today so that we can order the inspection with apple valley for tomorrow. wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
N/A
Permit #:
2023-2865
Status:
final
Fee:
$245
Permit Type:
N/A
Building Type:
N/A
Residential dwelling (brs) - single family dwelling - single family detached dwelling
2025-08-26
New replacement 3 story single family residence (2 377 sq.ft) w/atrium attached garage (536 sq.ft) decks/porch (1 086 sq.ft) solar (bde2100148)
Valuation:
$338,050
Permit #:
BRS2301247
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Roof mounted solar system 3.2 kw 8 panels 400 watts 8 enphase microinverters on a newly constructed home. wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
$11,540
Permit #:
2024-2303
Status:
issued
Fee:
$434
Permit Type:
N/A
Building Type:
N/A
Roof mount solar installation 26 canadian solar cs3n-395ms-blk solar panels with 26 enphase iq8+-72m-us (240v) micro inverters with 2 tesla powerwall 3 batteries. wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
N/A
Permit #:
2024-1139
Status:
issued
Fee:
$434
Permit Type:
Batteries
Building Type:
N/A
Plumbing plan revisions delta # 2 to permit b202303790 (hilton hampton inn + home2)
Valuation:
N/A
Permit #:
B202407127
Status:
plancheck
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Roof mounted solar installation. (7) canadian solar cs6r400ms blk 400watt solar panels. (7) enphase iq*+72-m-us (240v) micro-inverters 2.800kwdc wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
N/A
Permit #:
2024-580
Status:
issued
Fee:
$434
Permit Type:
None
Building Type:
N/A
Roof mounted solar 9 canadian solar cs6r400ms-hl (blk) 400 watt solar panels with 9 enphase iq*plus 72-m-us (240v) micro-inverters. smoke and carbon monoxide ltr due at final wmp req'd before final
Valuation:
$9,000
Permit #:
2023-2447
Status:
issued
Fee:
$435
Permit Type:
N/A
Building Type:
N/A
New photovoltaic/solar installation (residential)
2025-07-22
New roof mounted photovoltaic system
Valuation:
$1,000
Permit #:
ELER24-00105
Status:
expired
Fee:
$368
Permit Type:
N/A
Building Type:
N/A
20 canadian solar cs3n-395ms-blk solar panels 2 tesla powerwall 3 batteries. wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
N/A
Permit #:
2024-1236
Status:
issued
Fee:
$556
Permit Type:
Batteries
Building Type:
N/A
Roof mounted solar installation with 9 canadian solar 400 watt solar panels and 9 enphase micro-inverters. wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
$12,740
Permit #:
2023-2489
Status:
issued
Fee:
$435
Permit Type:
N/A
Building Type:
N/A
Residential dwelling (brs) - single family dwelling - single family detached dwelling
2024-10-24
One story 1, 080 dwelling with 128 sf porch roof mount solar
Valuation:
$127,208
Permit #:
BRS2400352
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Photovoltaic
Val: $39, 000 roof mount 39 panels 15.600kw derating main breaker to 175a no mpu smoke and carbon monoxide ltr due at final wmp req'd before final
Valuation:
N/A
Permit #:
2023-795
Status:
plancheck
Fee:
$150
Permit Type:
N/A
Building Type:
N/A
Photovoltaic roof mount solar 6.8kw dc 4.930kw air conditioning 17 modules 17 inverters (n) 400a mpu (n)200a main breaker (n)175a main breaker
Valuation:
$34,340
Permit #:
BEL2301792
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Roof mount solar installation 14 canadian solar 400 watt panels 14 enphase micro inverters 1 gma
Valuation:
$14,000
Permit #:
B2302495
Status:
final
Fee:
$410
Permit Type:
N/A
Building Type:
N/A
11/18/22 revisions: not doing a main panel upgrade and derating the main breaker. roof mount 24 panels 9.600kw new 200a mpu smoke and carbon monoxide ltr due at final wmp req'd before final
Valuation:
N/A
Permit #:
2022-3184
Status:
issued
Fee:
$554
Permit Type:
N/A
Building Type:
N/A
Qty (24) cs3n400ms 400 watt panels qty (1) tesla powerwall 3 wmp req'd smoke and carbon monoxide ltr due at final
Valuation:
N/A
Permit #:
2024-1612
Status:
final
Fee:
$434
Permit Type:
Batteries
Building Type:
N/A
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Guasti Construction Inc Reviews
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Guasti Construction Inc License info
Verified License
| License # | 534390 |
| Status | Active |
| State | California |
| Type | General Building, Solar |
| Business Type | Corporation |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Guasti Construction Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 5088 |
| Status | Active |
| City | Fontana |
| Type | Contractor |
| Business Type | Corporation |
- When BuildZoom last verified this license, it had an expiration date of January, 2018. Check the current license status of Guasti Construction Inc with the The City of Fontana, CA
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 486626 |
| Status | Inactive |
| State | California |
| Type | Plumbing |
| 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 Guasti Construction Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
111
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
336
Permits
- Building permit records show that Guasti Construction Inc has worked on 336 permitted projects.
Guasti Construction Inc Employees
JG
James Reno Guasti
Sole Owner
JG
Joseph Anthony Guastadisegni
Sole Owner