Updated: Jun 21, 2026
Location and Projects
Address
P O BOX 579, Los Altos, CA, 94023
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John Mansch Construction
Based in Los Altos, John Mansch Construction has over three decades of experience managing residential construction projects in the San Francisco Peninsula area. The company focuses on custom home building and home renovations, working with homeowners to realize tailored living spaces that meet specific needs and design preferences. Projects commonly include new home construction, additions, and complex remodeling for existing properties throughout Los Altos and surrounding communities. John Mansch Construction oversees all phases of the building process, from initial planning through final detailing. The company’s portfolio highlights skilled work on kitchens, baths, and whole-house transformations, with an emphasis on efficient layouts and thoughtful finish selection. Serving single-family residences, John Mansch Construction applies practical building solutions gained from more than 31 years in the local construction industry.
John Mansch Construction Services
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John Mansch Construction Contact Information
Phone Number: (408) 264-8333
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Address: P O BOX 579, Los Altos, CA 94023
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John Mansch Construction Los Altos
Quality
103
90th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
John Mansch Construction has a BuildZoom score of 103, which places them above 90% of 336,931 contractors in California.
Activity
|
3 projects
|
2025 |
Our building permit records indicate that John Mansch Construction has worked on at least
3.0 projects over the past year.
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.
Pricing
|
1 project
|
$50k-$100k |
|
1 project
|
$250k-$500k |
|
1 project
|
$500k-$1mil |
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.
John Mansch Construction Reviews
5 out of 5 stars, based on
2
reviews
-
By Rhon H.June 22, 2023Custom Home Build
-
AnonymousSeptember 4, 2012
Fantastic home builder - on time, on budget with great attention to detail. Highly recommend.
Building Permits by John Mansch Construction
This is a sample of this contractor's permits. Click here to access their complete permit history.
New residence w detached garage & basement
Valuation:
$975,590
Permit #:
BLD19-0591
Status:
issued
Fee:
$91,804
Permit Type:
With basement
Building Type:
N/A
249 sf addition of a gym above garage remodel multiple room
Valuation:
$450,000
Permit #:
BLD20-0341
Status:
issued
Fee:
$18,853
Permit Type:
N/A
Building Type:
N/A
Secondary dwelling unit on top of two car garage
Valuation:
$99,000
Permit #:
BLD19-0592
Status:
issued
Fee:
$5,486
Permit Type:
Detached 0-800 sq ft
Building Type:
N/A
830 sq ft newly constructed adu
Valuation:
$350,000
Permit #:
BLD22-0190
Status:
issued
Fee:
$12,957
Permit Type:
Detached 801-1200...
Building Type:
N/A
New 2-story single family residence residence 2214sf and conditioned basement 1309sf. (16-772:detached 223sf single car garage.)
Valuation:
$637,323
Permit #:
16000-00771
Status:
final
Fee:
$18,484
Permit Type:
N/A
Building Type:
N/A
New detached 223sf single car garage (16-771:new 2-story single family residence residence 2214sf and conditioned basement 1309sf.)
Valuation:
$14,883
Permit #:
16000-00772
Status:
final
Fee:
$1,171
Permit Type:
N/A
Building Type:
N/A
New two-story residence
Valuation:
N/A
Permit #:
BLD20-01246
Status:
final
Fee:
$18,902
Permit Type:
Two-story
Building Type:
N/A
Detached adu
Valuation:
N/A
Permit #:
BLD21-01328
Status:
final
Fee:
$3,970
Permit Type:
Detached
Building Type:
N/A
Mansch residence: remodel kitchen & 2 bathrooms like for lik
Valuation:
$30,000
Permit #:
B-BP21-0569
Status:
final
Fee:
$4,559
Permit Type:
Kitchen & bathroo...
Building Type:
N/A
Temporary power pole 200 amp
Valuation:
$980
Permit #:
BLD21-0442
Status:
final
Fee:
$190
Permit Type:
Temporary power pole
Building Type:
N/A
Temporary power pole
Valuation:
N/A
Permit #:
BLD21-00194
Status:
final
Fee:
$83
Permit Type:
Tpp
Building Type:
N/A
Temporary power pole
Valuation:
N/A
Permit #:
BLD20-01205
Status:
final
Fee:
$83
Permit Type:
Tpp
Building Type:
N/A
Tpp
Valuation:
N/A
Permit #:
BLD25-00735
Status:
final
Fee:
$215
Permit Type:
Tpp
Building Type:
N/A
Temporary power pole
Valuation:
N/A
Permit #:
BLD19-00791
Status:
final
Fee:
$83
Permit Type:
Tpp
Building Type:
N/A
Major add/remodel
Valuation:
N/A
Permit #:
BLD19-00463
Status:
final
Fee:
$14,092
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
65120537
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$1,000
Permit #:
65120367
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition 378 sf to 1st floor; remodel 729 sf on 1st floor; addition 79 sf to attached garage; (n) deck 71 sf (n) 90 sf roofed open porch; tear off shingles new roof framing r/r tile 2470 sf; demolish pool and deck; upgrade service equipment to 200 amps; replace furnace & addition a/c; relocate water heater
Valuation:
$500,000
Permit #:
B08-0249
Status:
final
Fee:
$10,922
Permit Type:
N/A
Building Type:
N/A
(n) retaining wall (customer needs to submit application with complete info)
Valuation:
$0
Permit #:
B17-0226
Status:
Pending
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential addition ~1057sf and remodel 500sf. new tankless water heater. service upgrade to 200 amps in same location. new sump pump at basement
Valuation:
$220,000
Permit #:
15000-00112
Status:
final
Fee:
$8,411
Permit Type:
N/A
Building Type:
N/A
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
John Mansch Construction License info
Verified License
| License # | 747292 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for John Mansch Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 575951 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- 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 Mansch Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 520463 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- 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 Mansch Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 519378 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- 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 Mansch Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
103
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Benchmark Insurance Company |
38
Permits
- Building permit records show that John Mansch Construction has worked on 38 permitted projects.
John Mansch Construction Employees
BM
Bret James Mansch
Sole Owner
EM
Eileen Elizabeth Woodard Mansch
Officer
JM
John Donald Mansch
Rmo
JJ
John Donald Mansch Jr
Owner
Custom home John built for us in Saratoga was a dream project. Attention to detail, transparency in billing, ethical and on-time. Best GC in the Bay Area!