Cornerstone Earth Group, Inc.
Cornerstone Earth Group is a private Bay Area geotechnical engineering and environmental consulting firm serving developers, technology companies, healthcare, education, data center, and government clients with integrated site investigation, AASHTO-accredited laboratory, and construction observation services since 2007.
- Company typePrivate
- Founded2007
- HeadquartersSunnyvale, United States
- Headcount101–250
- GTM typeB2B
- OfferingServices
What Cornerstone Earth Group, Inc. does
Cornerstone Earth Group, Inc. is a private geotechnical engineering and environmental consulting firm headquartered in Sunnyvale, California, founded in 2007 by principals who departed Lowney Associates following its 2003 acquisition. The firm provides integrated geotechnical, environmental, and construction services across the San Francisco Bay Area, supported by a second office in Lafayette, California, and a staff of 101–250 employees. Its client base spans marquee technology firms (Meta, Google, Adobe, LinkedIn, Apple, ServiceNow), medical device and healthcare (Intuitive Surgical), higher education (Stanford University), data center operators (CoreSite), municipal government (City of San Jose), and real estate developers (Overton Moore Properties).
The firm's service portfolio includes core geotechnical engineering (foundation investigations, seismic analysis, pavement design, shoring and earthwork), environmental services (Phase I/II site assessments, soil vapor intrusion evaluations, groundwater investigations, remediation design, and regulatory compliance), and construction observation and testing (foundation observation, earthwork testing, utility trench backfill testing, pavement testing, pile observation, and slope mitigation). Specialized offerings include drone-based aerial imagery, 3D modeling, geospatial overlays, and construction progression mapping, plus an in-house geotechnical laboratory accredited by AASHTO re:source and approved by the California Division of State Architect (LEA #245) for soil classification, consolidation, compaction, Atterberg limits, lime stability, and corrosion screening. The firm also delivers vapor intrusion mitigation design, including methane mitigation, active system design with fan sizing, remote real-time monitoring, air permitting, and long-term O&M programs.
Cornerstone operates a project-based professional services revenue model with fees quoted per engagement based on scope, site complexity, and regulatory requirements; the firm reports that 90% of revenue derives from repeat business, indicating high client retention. The go-to-market is sales-led and referral-driven, with new business sourced primarily through word-of-mouth, recommendations, and direct engagement with developers, construction companies, property owners, and government entities across the Bay Area. The company carries no disclosed institutional or private equity backing, with ownership concentrated among the seven founding principals and current senior leadership.
Cornerstone Earth Group, Inc. firmographics
Firmographics- Name
- Cornerstone Earth Group, Inc.
- Legal name
- Cornerstone Earth Group, Inc.
- Website
- https://cornerstoneearth.com
- Company type
- Private
- Founded year
- 2007
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Cornerstone Earth Group is a private Bay Area geotechnical engineering and environmental consulting firm serving developers, technology companies, healthcare, education, data center, and government clients with integrated site investigation, AASHTO-accredited laboratory, and construction observation services since 2007.
- Ownership category
- akta.pro rank
Cornerstone Earth Group, Inc. industry classification
Industry- Product category
- Geotechnical Engineering Services
- NAICS
- Testing Laboratories and Services (54138), Geophysical Surveying and Mapping Services (541360)
- SIC
- Services-Commercial Physical & Biological Research (8731), Heavy Construction Other Than Bldg Const - Contractors (1600)
- akta.pro primary industry
- Geotechnical Design, Engineering & Consulting (Analysis, Design, Peer Review) (IMAFAOAK)
- akta.pro secondary industries
- Geotechnical Investigation & Site Characterization (Boreholes, In-situ Testing, Lab Testing) (IMAFAOAG), Brownfield Redevelopment Due Diligence & Grant Support (EUAHAEAD), Earth Retention & Excavation Support (Sheet/Soldier Piles, Diaphragm Walls, Bracing) (IMAFAOAD)
Keywords
Where Cornerstone Earth Group, Inc. is headquartered
LocationHeadquarters
- HQ city
- Sunnyvale
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Cornerstone Earth Group, Inc. business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Geotechnical Engineering Consulting: Project-based professional services revenue from geotechnical site investigations, foundation analyses, seismic evaluations, pavement design, and related engineering consulting for construction and development projects.
- Environmental Consulting Services: Project-based revenue from Phase I/II environmental site assessments, remediation design, groundwater monitoring, soil vapor intrusion evaluations, and regulatory compliance services.
- Construction Observation and Testing Services: Field observation, testing, and quality assurance services during construction phases including foundation observation, earthwork testing, utility trench backfill testing, and pavement testing.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Project-based professional consulting services |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels9 records
Cornerstone Earth Group, Inc. product offering
Product offeringCore offering
Cornerstone Earth Group provides integrated geotechnical engineering, environmental consulting, and construction observation and testing services for development projects across the San Francisco Bay Area. The firm combines field investigation, in-house accredited soil laboratory testing, drone aerial imagery, and specialized vapor intrusion mitigation to support commercial, institutional, public works, residential, and industrial construction clients from site assessment through construction completion.
Product overview
Cornerstone Earth Group provides integrated geotechnical engineering, environmental, and construction services to the Bay Area development community. The core offering consists of Environmental Services (Phase I/II assessments, remediation, vapor mitigation), Geotechnical Services (foundation investigations, seismic analysis, pavement design, field and lab testing), and Construction Services (observation, testing, slope mitigation). The firm also offers specialized Drone Services for aerial site reconnaissance and geospatial mapping, an AASHTO-accredited Laboratory Services division for soil testing, and Vapor Mitigation Services for chemical vapor intrusion concerns. These services serve commercial, institutional, residential, mixed-use, public works, and industrial markets across the San Francisco Bay Area.
Differentiator
Problem solved
Functional benefit
Quantifiable outcome
- 90% of revenue comes from repeat business
- +2 more outcomes
Companies that use Cornerstone Earth Group, Inc.
Customer profileNamed customers11 records
Segments5 records
Ideal customer profiles4 records
Cornerstone Earth Group, Inc. technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Cornerstone Earth Group, Inc. partnerships and signals
Strategic signalScale indicators3 records
Recent moves4 records
Expansion highlights5 records
Cornerstone Earth Group, Inc. competitors and assessment
Company assessmentDirect peers
- Kleinfelder: Large multi-disciplinary engineering firm providing geotechnical, environmental, and construction services nationally; directly comparable to Cornerstone's core service stack and client base, though at materially greater scale.
- GeoEngineers: Earth science and engineering firm providing geotechnical, environmental, and geological services to real estate and infrastructure developers—closely comparable service profile and project types.
- Haley & Aldrich: Geotechnical and environmental consulting firm serving real estate, infrastructure, and industrial clients—closely matches Cornerstone's integrated geotechnical + environmental + vapor mitigation service mix.
- Terracon Consultants: National geotechnical, environmental, construction materials engineering and testing firm—directly comparable services (geotech, environmental site assessment, construction observation) and customer overlap in commercial/institutional development.
- ENGEO Incorporated: California-based geotechnical and environmental engineering firm with offices across Northern California—directly comparable Bay Area competitor for site characterization, foundation engineering, and construction observation.
- NV5 Global: Provider of technical engineering and consulting services including geotechnical, environmental, and construction quality assurance—overlapping service lines and customer base in commercial/institutional development.
- Langan Engineering & Environmental Services: Site/civil, geotechnical, and environmental consulting firm with strong real estate developer client base—directly comparable service offering, target clients, and project-based professional services model.
Broad incumbents
- AECOM: Global infrastructure consulting firm that includes geotechnical, environmental, and construction management services within a much broader portfolio—competes for large Bay Area projects and bundles services Cornerstone cannot.
- Stantec: Global engineering, architecture, and environmental services firm with a strong geotechnical and environmental practice—overlapping with Cornerstone on site assessment, foundation engineering, and construction observation at larger project scale.
- WSP Global: International engineering professional services firm including earth and environment practice—competes on Bay Area real estate, transportation, and water infrastructure with broader service breadth than Cornerstone.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Cornerstone Earth Group, Inc. social profiles
Digital presenceCornerstone Earth Group, Inc. compliance and trust
Trust signalCompliance2 records
Cornerstone Earth Group, Inc. financial estimates
Financial estimateRevenue estimate
Valuation estimate
Cornerstone Earth Group, Inc. leadership team
Management profileNumber of profiles
Profiles13 records
Cornerstone Earth Group, Inc. funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Cornerstone Earth Group, Inc. M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Cornerstone Earth Group, Inc.
What does Cornerstone Earth Group, Inc. do?
Cornerstone Earth Group provides integrated geotechnical engineering, environmental consulting, and construction observation and testing services for development projects across the San Francisco Bay Area. The firm combines field investigation, in-house accredited soil laboratory testing, drone aerial imagery, and specialized vapor intrusion mitigation to support commercial, institutional, public works, residential, and industrial construction clients from site assessment through construction completion.
Is Cornerstone Earth Group, Inc. a public or private company?
Cornerstone Earth Group, Inc. is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Cornerstone Earth Group, Inc. founded?
Cornerstone Earth Group, Inc. was founded in 2007. It employs 101 to 250 people.
Where is Cornerstone Earth Group, Inc. based?
Cornerstone Earth Group, Inc. is headquartered in Sunnyvale, United States, in the North America region.
How does Cornerstone Earth Group, Inc. make money?
Three revenue lines are on record. Geotechnical Engineering Consulting is the primary driver. The others are environmental Consulting Services and construction Observation and Testing Services.
Who are Cornerstone Earth Group, Inc.'s main competitors?
Direct peers on record are Kleinfelder, GeoEngineers, Haley & Aldrich, Terracon Consultants, ENGEO Incorporated, NV5 Global and Langan Engineering & Environmental Services. Broad incumbents are AECOM, Stantec and WSP Global.
Does Cornerstone Earth Group, Inc. have an API?
No public API is recorded for Cornerstone Earth Group, Inc..
What industry is Cornerstone Earth Group, Inc. in?
Cornerstone Earth Group, Inc.'s product category is Geotechnical Engineering Services. Its primary akta.pro industry code is IMAFAOAK, Geotechnical Design, Engineering & Consulting (Analysis, Design, Peer Review), with a secondary code of IMAFAOAG, Geotechnical Investigation & Site Characterization (Boreholes, In-situ Testing, Lab Testing). Its NAICS code is 54138 and its SIC code is 8731.