Updated: May 18, 2026
Location and Projects
Address
PO BOX 746, Corte Madera, CA, 94976
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Abacus Group Builders Construction
Abacus Group Builders Inc has served the Marin County area for 24 years, bringing expertise to custom architectural construction projects in Corte Madera and surrounding communities. The company specializes in managing complex, design-driven construction from pre-construction through project completion, emphasizing early collaboration with clients, architects, and engineers. Abacus provides rigorous construction management, developing detailed project schedules and ensuring transparent communication among all stakeholders throughout each phase. Skilled in architectural woodwork and finish carpentry, the team integrates artistic and pragmatic solutions into residential builds. Their process typically begins with pre-construction planning to set expectations and continues with hands-on project oversight, balancing efficiency, quality, and cost effectiveness. Abacus is known for a collaborative building approach and for delivering results that closely align with each client’s creative vision.
Abacus Group Builders Inc Services
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Abacus Group Builders Inc Contact Information
Phone Number: (415) 927-0667
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Address: PO BOX 746, Corte Madera, CA 94976
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Abacus Group Builders Inc Corte Madera
Quality
109
95th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Abacus Group Builders Inc has a BuildZoom score of 109, which places them above 95% of 336,931 contractors in California.
Activity
|
13 projects
|
2025 |
|
3 projects
|
2024 |
|
3 projects
|
2023 |
Our building permit records indicate that Abacus Group Builders Inc has worked on at least
19.0 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
|
Home Additions |
|
5 projects
|
Multi-room remodels |
Analyzing permits over the last 4 years shows that Abacus Group Builders Inc mostly works on
multi-room remodel
and home addition
projects.
Pricing
|
1 project
|
< $5k |
|
2 projects
|
$5k-$20k |
|
2 projects
|
$20k-$50k |
|
2 projects
|
$50k-$100k |
|
2 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
|
1 project
|
$500k-$1mil |
The typical size of their permits is approximately $75,000. 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.
Building Permits by Abacus Group Builders Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Exterior repair including the replacement of windows and new siding on both sides and the rear facade. no changes to front facade other than window sash replacement. total 77 windows w/same size and locations. total 5 doors w/same size and locations
Valuation:
$468,000
Permit #:
202406184698
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Remodel & addition at rear of house remove stairs 2nd floor
Valuation:
$600,000
Permit #:
B2022-0313
Status:
final
Fee:
$16,140
Permit Type:
Remodel
Building Type:
N/A
Install fire resistant cement board siding over existing t11 plywood siding/sheathing
Valuation:
$50,000
Permit #:
B41004
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Remodel kitchen convert part of living area to new bedroom reconfigure laundry room
Valuation:
$120,000
Permit #:
179597
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Revision to 201711274839 s1 & s2 to document as- built conditions including external openings alteration of internal spiral to square. addition of external spiral stair. proposed trim at facade. no change to special inpsections - see pa 201711274839-s1
Valuation:
$19,250
Permit #:
202311070384
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Revision to pa# 2018-0515-9168. additional work include: addition deck w addition 188s.f. of living space/master bedroom below spiral structure(exterior) & replace windows w doors to deck
Valuation:
$100,000
Permit #:
201807235263
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Residential - remodel and convert basement to 800sqft. adu
Valuation:
N/A
Permit #:
REVAL-050191
Status:
final
Fee:
$99,805
Permit Type:
Residential
Building Type:
N/A
Exterior building maintenance - remove failed exterior wood shingles and replace with stucco
Valuation:
$35,000
Permit #:
B42864
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Remodel kitchen and bathroom 2 bedrooms and 2 baths by excavating lower level
Valuation:
$500,000
Permit #:
201805159168
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Re-roofing
Valuation:
N/A
Permit #:
BD2506-0013
Status:
final
Fee:
$1,711
Permit Type:
Residential repair
Building Type:
N/A
Voluntary seismic upgrade to the main residence. renovation of (e) facades inlcuding (n) windows. (n) elevator. horizontal addition (140sqft) new skylight and interior remodel
Valuation:
$500,000
Permit #:
201711274839
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Residence - re-roof. no stated re-sheet. flatmembrane or t&g
Valuation:
N/A
Permit #:
B-050112
Status:
issued
Fee:
$1,436
Permit Type:
Low slope w tear off
Building Type:
N/A
In-kind remodeling of 1 kitchen(s) in 2nd fl
Valuation:
$50,000
Permit #:
202406073930
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Replacement of single glazed doors and windows
Valuation:
$75,000
Permit #:
B-050111
Status:
final
Fee:
$2,875
Permit Type:
Window or door re...
Building Type:
N/A
Residential - remodel and convert basement to 800 sq. ft. ad
Valuation:
N/A
Permit #:
B-042810
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential - new detached adu
Valuation:
N/A
Permit #:
B-044528
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Renovate accessory building 2nd fl to adu - 496 sf
Valuation:
N/A
Permit #:
BD2308-0043
Status:
issued
Fee:
$10,404
Permit Type:
Adu
Building Type:
N/A
Residential remodel: no added conditioned space
Valuation:
N/A
Permit #:
B-043918
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
67 sf addition and covered porch extension
Valuation:
N/A
Permit #:
BD2212-0005
Status:
final
Fee:
$17,576
Permit Type:
N/A
Building Type:
N/A
In-kind remodeling of 1 kitchen(s) in 2nd fl
Valuation:
N/A
Permit #:
E202406074841
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
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Avg Project
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Projects
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BZ Score
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Avg Project
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Projects
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Abacus Group Builders Inc License info
Verified License
| License # | 522340 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Abacus Group Builders 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 # | NAT-53173-3 |
| Status | Inactive |
| Nation | Environmental Protection Agency |
| Type | Renovation |
| Business Type | Corporation |
- According to the United States Environmental Protection Agency, 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 Abacus Group Builders Inc at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | NAT-53173-2 |
| Status | Inactive |
| Nation | Environmental Protection Agency |
| Type | Renovation |
| Business Type | Corporation |
- According to the United States Environmental Protection Agency, 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 Abacus Group Builders Inc at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
109
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Workers' Compensation History |
53
Permits
- Building permit records show that Abacus Group Builders Inc has worked on 53 permitted projects.
Abacus Group Builders Inc Employees
CI
Charles Brown Voorhis Iii
Rmo / Ceo / Pres
TV
Tara Rao Voorhis
Officer