Williams + Paddon

What Williams + Paddon does

Williams + Paddon is a privately held architecture and construction services firm headquartered in Roseville, California, founded in 1981 and operating with 11-50 employees. The firm delivers architecture, interior design, and planning services, with associated data positioning it within a broader multidisciplinary design practice (operating under related entities including 19six Architects) that integrates architecture, structural engineering, interiors, and master planning under a single roof. Revenue is generated through professional services fees on a quote-based model, with project scope, complexity, and client requirements determining pricing; no public pricing disclosure exists. The firm serves a diversified client base across K-12 education, higher education, healthcare, performing arts, civic, hospitality, and housing verticals, with an active project footprint spanning multiple California metros including Sacramento, San Luis Obispo, Santa Barbara, Riverside, and Merced.

The go-to-market model is direct-to-client enterprise project acquisition, relying on RFP responses, client referrals, repeat engagements, and portfolio-driven outreach, supported by a content-driven marketing presence through a project portfolio website and a legacy scholarship program targeting architecture students. Notable named engagements include Natomas Charter School, Cal Poly Crandall Gym Renovation, Riverside City College, Northern California Fertility Medical Center, Merced County Behavioral Health, Red Hawk Resort + Casino, The Granada Theatre, Heredia-Arriaga Dual Immersion School, and Sonrisa Studio Apartments. The firm has demonstrated design-build delivery capability through a partnership with AMG & Associates and participation in state-supported affordable housing pipelines under Governor Newsom's Executive Order.

The firm has no disclosed AI/ML, software product, or technology platform footprint; it is a pure professional services practice with no app presence, no APIs, and no proprietary technology assets documented in the input. Ownership structure, external funding, and investor backing are not disclosed.

Name

Williams + Paddon

Legal name

19six Architects

Website

https://wp-architects.com

Company type

Private

Founded year

1981

Operating status

Operating

Headcount range

11–50 employees

Short description

Williams + Paddon is a privately held architecture and construction services firm in Roseville, California, founded in 1981, delivering architecture, interior design, structural engineering, and master planning services to K-12, higher education, healthcare, hospitality, civic, and housing clients across California.

Ownership category

akta.pro rank

Product category

Architectural Services

NAICS

Architectural Services (541310), Interior Design Services (54141)

SIC

Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industries

Interior Design Services (BPAHAKAB), Urban Planning & Master Planning (BPAHAKAD)

Keywords

• Architecture design services
• Structural engineering services
• Interior design services
• Master planning services
• Commercial building design

Headquarters

HQ city

Roseville

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Architecture and Design Services: Professional services revenue generated through architecture, structural engineering, interior design, and master planning engagements for K-12 education, higher education, healthcare, performing arts, civic, hospitality, and housing projects.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Williams + Paddon (operating as 19six Architects) is a multidisciplinary design firm that provides architecture, structural engineering, interior design, and master planning services. The firm delivers integrated design solutions for K-12 education, higher education, healthcare, performing arts, civic, hospitality, and housing projects, primarily in California. Engagement is project-based, with services delivered from concept through completion.

Product overview

19six is a multidisciplinary architectural design firm offering a unified portfolio of professional services. The core offerings include Architecture, Structural Engineering, Interiors, and Master Planning services, delivered as integrated design solutions across diverse project sectors including K-12 Education, Higher Education, Healthcare, Performing Arts, Civic, Hospitality, and Housing. This is a service-based firm, not a software or technology product company.

Differentiator

Problem solved

Functional benefit

Products and services

• Architecture Services

Named customers9 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

Partnerships

One partnership is on record.

• AMG & AssociatescoreStrategic or Co-development PartnerDesign-build collaboration on Cal Poly Crandall Gym Renovation project. 19six provided architectural services while AMG & Associates served as the design-build partner for this historic renovation into flexible office use at California Polytechnic State University, San Luis Obispo.

Scale indicators1 record

Recent moves4 records

Expansion highlights4 records

Broad incumbents

• Gensler: Global architecture and design firm with significant education, healthcare, and hospitality practices — broad incumbent that competes for larger institutional commissions.
• HOK: Global architecture, engineering, and planning firm with established education, healthcare, and civic practices — broad incumbent competing for the same institutional and public-sector clients.
• Perkins&Will: Large national/global architecture practice with overlapping education and healthcare portfolios — broader incumbent that competes for the same institutional RFPs at greater scale.
• HKS Architects: National architecture firm with significant higher education and healthcare portfolios — broad incumbent competing for institutional projects the subject firm also pursues.

Direct peers

• DLR Group: Integrated architecture and engineering design firm with strong education, healthcare, and civic practices — directly comparable integrated A&E delivery model.
• CannonDesign: Integrated design firm offering architecture, engineering, interiors, and planning across education and healthcare verticals — directly comparable multidisciplinary, sector-aligned practice.
• HMC Architects: California-headquartered architecture firm with concentrated portfolios in education and healthcare — directly comparable to the subject firm's vertical mix and California-centric operating footprint.
• SmithGroup: Multidisciplinary design firm offering architecture, structural engineering, interiors, and planning — closely comparable service portfolio spanning education, healthcare, and civic work.
• LPA Design Studios: California-based multidisciplinary architecture firm with deep practices in K-12/higher education, healthcare, and civic markets — directly comparable in service mix, sector focus, and integrated design-build delivery.
• Quattrocchi Kwok Architects: California-based architecture firm with a primary focus on K-12 and higher education — directly comparable regional peer with similar vertical concentration and client base.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/williams_paddon
• Facebookfacebook.com/williamspluspaddon
• LinkedInlinkedin.com/company/williams_and_paddon

Revenue estimate

Valuation estimate

Number of profiles

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 Williams + Paddon