G. Gohmann Builders

What G. Gohmann Builders does

G&G Builders, Inc., operating as G. Gohmann Builders, is a privately held boutique commercial general contractor founded in 1998 in Livermore, California by George and Gerard Callahan. The firm operates as a turn-key general contractor serving the San Francisco Bay Area and broader Northern California, organized around three service lines: commercial tenant improvements (including Fitness 19 locations and a long-running contract with Oakland Arena/RingCentral Coliseum via AEG Management); prefabricated structure installation (notably as Sprung Structures' No. 1 Preferred Vendor in Northern California, with installations for Tesla, Google, and Amazon); and public works projects including playground and park construction and navigation centers for homeless services across San Francisco, Sacramento, Stockton, Fremont, Menlo Park, and Sunnyvale. The company self-performs most work, controls scheduling internally, and offers design-build, pre-construction, permitting, and project management services.

Underlying technology is conventional construction SaaS—RedTeam for estimating and project management, Raken for daily reports and progress photos, Bluebeam for design review, Dropbox for file sharing, and ExakTime for GPS-based time tracking—rather than proprietary systems. Differentiated capabilities center on specialized methods: tension fabric Sprung Structure erection (16+ year partnership, instrumental to the Navigation Center model) and shipping-container modular construction (debuted with the 3-story, 42-container Stockton Navigation Center). The firm documents an Experience Modification Rate of 76%, materially below the construction industry average of 100%, supporting competitive bonding and qualification for sensitive public and corporate work.

The business model is project-based professional services revenue with quote-driven, custom pricing per project scope. Go-to-market combines public bidding for municipal work and direct sales for commercial tenant improvements, supported by long-standing client relationships and free, transparent estimates that can take up to a week to produce. The firm is family-owned and controlled by Gerard Callahan (President/Owner) with no institutional funding, no subsidiaries, and no disclosed revenue; growth has been funded organically over 25+ years.

Name

G. Gohmann Builders

Legal name

G&G Builders, Inc.

Website

https://ggbuildersinc.com

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

11–50 employees

Short description

G&G Builders is a privately held, family-owned boutique commercial general contractor founded in 1998 in Livermore, California, delivering tenant improvements, Sprung Structure prefabricated buildings, and public works projects across Northern California.

Ownership category

akta.pro rank

Product category

Commercial Construction Services

NAICS

Nonresidential Building Construction (2362), Commercial and Institutional Building Construction (236220), Industrial Building Construction (23621)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540), Construction - Special Trade Contractors (1700)

akta.pro primary industry

Self-Performing General Contractors (IMAFAAAI)

akta.pro secondary industries

Commercial General Contracting (New Build) (IMAFAAAA), Office & Corporate Building Construction (IMAFACAA), Landscape Construction Project Management & General Contracting (HSAIABAK)

Keywords

• Commercial general contracting
• Tenant improvements
• Prefabricated structures
• Public works construction
• Sprung structure installation

Headquarters

HQ city

Livermore

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Technology or R&D

Revenue model

1. General Contracting Services: Commercial and tenant improvement construction services including commercial revisions, tenant improvements, and new construction. Revenue is project-based with typical construction industry billing structures.
2. Prefabricated Structure Installation: Installation of Sprung Structures and modular/prefabricated buildings for various clients including corporations and government entities. Specialization as Sprung's No. 1 Preferred Vendor in Northern California.
3. Public Works Projects: Municipal construction projects including playgrounds, parks, navigation centers, and public facilities for various California cities and government agencies.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

G&G Builders is a turn-key boutique commercial general contractor in the San Francisco Bay Area that self-performs construction across three service lines: Commercial & Tenant Revisions (tenant improvements, office buildouts, restaurant and arena renovations), Prefabricated Structures (Sprung tension fabric buildings and shipping container modular construction for corporations and government), and Playgrounds & Parks (public works projects including playground construction, park renovations, and shade structures). The firm manages full project lifecycles from pre-construction and estimating through permitting, construction, and project closeout.

Product overview

G&G Builders, Inc. is a boutique commercial general contractor serving the San Francisco Bay Area. The company operates as a single unified construction services business rather than a platform-plus-modules architecture. Their core services encompass three main categories: Commercial & Tenant Revisions (tenant improvements for commercial spaces including Fitness 19 locations, Oracle Arena/RingCentral Coliseum projects, and office buildouts), Prefabricated Structures (Sprung tension fabric structures for corporate clients including Google, Tesla, Amazon, and navigation centers for homeless services), and Playgrounds & Parks (public works projects including playground construction, sports fields, and park amenities). The company self-performs most jobs and offers design-build, pre-construction, and project management services. They do not appear to offer a technology product or software platform with distinct branded modules.

Differentiator

Problem solved

Functional benefit

Products and services

• Commercial & Tenant Revisions Turn-key tenant improvements, commercial revisions, office buildouts, restaurant/hospitality spaces, and arena renovations for commercial tenants and corporate clients. Includes design, engineering, plan checks, permitting, and construction management delivered on time with resourceful ideas and quality workmanship.
• Prefabricated Structure Installation (Sprung Structures) Design, planning, erection, and finishing of Sprung tension fabric over metal frame structures for large corporations and government clients. G&G is Sprung's No. 1 Preferred Vendor in Northern California, with projects for Google, Tesla, Amazon, and multiple San Francisco navigation centers. These structures can be built faster than conventional buildings and use 45% less energy to heat and cool.
• Shipping Container Modular Construction Construction of structures built from shipping containers, offering a sustainable, durable, flexible, and time-efficient alternative to conventional construction. Demonstrated through the 42-container, three-story Stockton Navigation Center.
• Playground and Park Construction Complete playground and park construction services for municipal and public works clients, including planning, demolition, excavation, equipment installation, concrete and masonry work, rubber surfacing, and shade structures. Includes inclusive playground designs (e.g., Nealon Park with Miracle Playsystems and GameTime equipment).
• Navigation Center and Homeless Shelter Construction Construction of navigation centers, homeless shelters, and transitional housing for government and nonprofit clients, using Sprung Structures and shipping container methods to enable rapid deployment, with completed facilities as fast as 8 weeks. Key projects include the 100-bed X Street Navigation Center, Stockton Navigation Center, Meadowview Road Navigation Center, and 135 tiny homes.
• Turn-key Commercial Construction Management Full-service pre-construction through project completion delivery, including design, engineering, plan checks, permitting, and construction management for commercial projects. The same estimator follows each project through completion, with self-performed labor to control schedule and streamline communication.

Quantifiable outcome

• EMR (Experience Modification Rate) of 76% - significantly safer than industry average of 100%
• +4 more outcomes

Named customers16 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Sprung StructurescoreStrategic or Co-development PartnerG&G Builders is Sprung Structures' No. 1 Preferred Vendor in Northern California. They have partnered since 2008, installing Sprung Structures for San Francisco State University, navigation centers, and corporate facilities. Sprung designed these tension fabric buildings as a 'vital bridge between life on the streets and an affordable housing unit.' G&G has been integral in helping Sprung develop the Navigation Center Model.
• RPM TeamcoreImplementation/ SI/ Consulting PartnerRPM Team is a local design and consulting authority that partnered with G&G on the Stockton Navigation Center project. They serve as a design and consulting partner for navigation center projects. G&G works with RPM to help design programs and specify other prefab and modular building products to help keep project costs down.
• IMS BuildersminorStrategic or Co-development PartnerIMS Builders are specialists in modular container construction who partnered with G&G on the Stockton Navigation Center project. Both companies played an integral role in making the three-story shipping container navigation center a reality.
• Otto ConstructionminorImplementation/ SI/ Consulting PartnerOtto Construction worked with the City of Sacramento to prepare sites and assemble Sprung structures for navigation centers, including the Meadowview Road project.
• Sacramento Housing and Redevelopment Agency (SHRA)coreStrategic or Co-development PartnerSHRA partnered with the City of Sacramento to manage navigation centers including the Meadowview Road facility. G&G Builders constructed Sprung Structures for these projects under city partnerships.
• San Francisco Fire DepartmentminorStrategic or Co-development PartnerG&G completed Sprung Structure Project at Treasure Island for San Francisco Fire Department.

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Swinerton: California-headquartered commercial general contractor with deep Bay Area presence across tenant improvements, commercial buildouts, and public works. Closest regional peer to G&G's commercial GC and prefab delivery model.
• BCCI Construction: San Francisco-based commercial general contractor with tenant improvement, historic renovation, and public-sector work. Closely comparable in scale, Bay Area focus, and owner-led boutique delivery model.
• Devcon Construction: Northern California commercial general contractor with tenant improvement, corporate buildout, and public-sector work. Directly comparable regional peer in mid-sized commercial projects.
• XL Construction: Bay Area commercial general contractor focused on tenant improvements, life sciences, and corporate office buildouts. Highly comparable in project size, regional focus, and owner-led delivery style.
• Level 10 Construction: Silicon Valley-based commercial GC specializing in tenant improvements, corporate interiors, and technical buildouts for tech and life-sciences clients. Comparable in Bay Area focus and TI-heavy mix.
• Rudolph and Sletten: Bay Area-headquartered commercial GC with deep experience in healthcare, technology, and corporate tenant improvements. Comparable regional peer across G&G's enterprise and prefab service lines.
• Webcor: San Francisco-headquartered commercial GC with tenant improvement, residential, and public-sector experience. Direct Bay Area competitor on commercial interior buildouts and major owner work.
• Blach Construction: San Jose-based commercial general contractor serving Silicon Valley with tenant improvements, education, and public works. Comparable regional peer across G&G's commercial and public-sector verticals.

Broad incumbents

• DPR Construction: National commercial GC with a strong Bay Area office serving technology, healthcare, and corporate clients. Operates at materially larger scale but overlaps directly in commercial TI and tenant improvement work.
• McCarthy Building Companies: Large national general contractor with a significant California presence in commercial, healthcare, and public-sector projects. Broader incumbent that competes for the same public works and institutional work G&G pursues.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about G. Gohmann Builders