Plum Architects

What Plum Architects does

Plum Architects is a privately held, woman-owned architecture firm founded in 2004 by Roberta Wahl and headquartered in San Francisco, California. The firm provides project-based professional architectural design services across four primary verticals: educational facilities (K-12 public schools, libraries, child development centers), residential projects (remodels, additions, Eichler and Victorian restorations), historic preservation (Mills Act reports, adaptive reuse, National Register-listed buildings), and commercial tenant improvements including seismic retrofits. The firm operates as a sales-led, direct-service practice without standardized pricing, generating revenue through negotiated project fees covering design, project management, and construction administration across multi-year engagements.

The firm's technical differentiation centers on sustainable and adaptive reuse design rather than proprietary technology: documented competencies include solar integration providing up to 75% of building power, rammed-earth construction using indigenous materials, rainwater collection systems, and conversion of existing structures (e.g., modular classroom buildings) into modern functional spaces. Underlying technology is conventional architectural practice (CAD/BIM workflows implied but not specified), with no software product, API, or digital platform disclosed. The firm maintains a project portfolio website, an external blog, and relies on referral networks with construction partners (Webb Construction, Grand Finishes) and specialty collaborators (Stefan Lyon Foundation for international work) as primary go-to-market channels.

Plum Architects is certified as a San Francisco Local Woman-Owned Business Enterprise and a San Francisco Green Business, and is a member of the AIA. The firm's customer base is heavily concentrated in San Francisco Unified School District, with additional projects across California (Forestville Union, San Lorenzo Unified, Southwest Museum in Los Angeles) and one documented international engagement in Bungoma, Kenya. The team consists of approximately six core members plus an extended network of frequent collaborators across design, construction, and specialty trades. No external funding, acquisitions, or ownership changes have been disclosed.

Name

Plum Architects

Legal name

Plum Architects

Website

https://plumarchitects.com

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

1–10 employees

Ownership category

akta.pro rank

Product category

Architectural Design Services

NAICS

Architectural Services (54131), Residential Remodelers (236118)

SIC

General Bldg Contractors - Residential Bldgs (1520)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industries

Residential Design-Build & Renovation-Integrated Builders (IMAFABAE), Kitchen Permitting, Design & Project Management (HSAPAAAK), Whole-Home Interior Renovation (Non-Structural) (HSAPAEAC)

Keywords

• Architectural design services
• Educational facility design
• Historic preservation architecture
• Residential remodel design
• Adaptive reuse architecture

Headquarters

HQ city

San Francisco

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Architecture and Design Services: Project-based professional services for architectural design, ranging from initial concept through construction completion. Revenue generated through fees for design services, project management, and construction administration.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Plum Architects is a small San Francisco-based architecture firm that provides architectural design, project management, and construction administration services. The firm specializes in educational facilities (K-12 schools, libraries, child development centers), residential remodels and additions, historic preservation projects, and commercial tenant improvements, with an emphasis on sustainable and adaptive reuse design approaches.

Product overview

Plum Architects is a small San Francisco-based architecture firm founded in 2004 that offers architectural design services across educational, residential, historical, community, and commercial programs. Their portfolio includes K-8 school facilities, libraries, child development centers, historic preservation projects, residential remodels (including Eichler homes and Victorian restorations), and commercial tenant improvements. The firm does not offer a software product platform—its offerings consist of professional architectural services and project consulting rather than a technical product with modules or add-ons.

Differentiator

Problem solved

Functional benefit

Products and services

• Educational Facility Design Full architectural design services for K-12 educational facilities including new school buildings, libraries, career technical facilities, child development centers, and classroom buildings for public school districts such as SFUSD, Forestville Union School District, and San Lorenzo Unified School District.
• Residential Remodel and Addition Design Architectural design services for residential homeowners including remodels, second-story additions, kitchen and bath renovations, Eichler home renovations, Victorian and Edwardian home restorations, and landscape-integrated exterior alterations.
• Historic Preservation Architecture Architectural services for historic buildings and structures requiring preservation, restoration, or sensitive modernization, including Mills Act reports, historic evaluations, and comprehensive renovations. Notable projects include the Southwest Museum in Los Angeles.
• Commercial Tenant Improvement Design Architectural design services for commercial properties including tenant improvements, seismic retrofits, restaurant and café spaces, retail showrooms, and professional offices, addressing code compliance, seismic safety, space optimization, and brand-appropriate design.
• Adaptive Reuse Design Architectural design services specializing in the conversion of existing structures (modular buildings, historic facilities) into modern functional spaces while preserving character and maximizing cost efficiency by eliminating the need for site utilities and foundation work.

Quantifiable outcome

• Solar panels provide up to 75% of building power for John O'Connell Technical High School
• +2 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eight partnerships are on record, tiered core and regular.

• Roberta WahlcoreOthers · 1 January 2004Roberta Wahl is the founder of Plum Architects, established in 2004. She graduated from Rhode Island School of Design with a Bachelor of Architecture and Bachelor of Fine Arts, and earned an Associates Degree in Culinary Arts from Johnson & Wales. She has decades of professional experience in the US and Europe with emphasis on educational projects, libraries, and restaurants.
• Webb ConstructioncoreImplementation/ SI/ Consulting PartnerWebb Construction, owned by Kevin Webb, collaborated with Plum Architects on the Carerra interior and exterior remodel project in Mill Valley. Plum was retained by Webb Construction to design the renovation.
• Grand FinishesregularImplementation/ SI/ Consulting PartnerGrand Finishes, led by expert craftspeople, has collaborated with Plum Architects on multiple projects including the 500 Quintara Second Story Addition and the Wooden Café project. Provided expert skill in constructing projects.
• The Foxy GardenregularImplementation/ SI/ Consulting PartnerThe Foxy Garden, owned by Audrey Newell, provided expertise in natives and drought tolerant plants for the Saratoga exterior alterations project.
• Stefan Lyon FoundationcoreStrategic or Co-development Partner13-year-old Stefan Lyon and his eponymous foundation partnered with Plum Architects and The Brothers of Saint Charles to build schools for children in Africa. The result was Mjengo Panda ('We build and grow') classroom project in Bungoma, Kenya.
• The Brothers of Saint CharlescoreStrategic or Co-development PartnerThe Brothers of Saint Charles, whose mission is to care for and educate poor and orphaned children in Eastern Africa, partnered with Plum Architects and the Stefan Lyon Foundation on the Mjengo Panda school project.
• Cesar Rubio PhotographyregularOthersCesar Rubio Photography provided photography for the Oak Street residential project in San Francisco.
• JD PetersonregularOthersJD Peterson provided photography for the Bessie Carmichael Middle School, Filipino Education Center project.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• LPA Design Studios: California-headquartered integrated design firm with a major dedicated K-12 education practice and deep expertise in sustainable, cost-efficient school design. Comparable to Plum in educational specialization, California base, and emphasis on sustainable design outcomes.
• Page & Turnbull: San Francisco-based architecture and planning firm specializing in historic preservation, adaptive reuse, and rehabilitation of significant structures. Directly comparable to Plum in historic preservation expertise (e.g., Southwest Museum work) and adaptive reuse projects like Forestville Library.
• HMC Architects: California-based architecture firm with one of the largest dedicated K-12 and higher education practices in the Western US. Directly comparable to Plum in target market (California public school districts) and project type (educational facilities, libraries, career technical buildings), but at much larger scale.
• Cody Anderson Wasney Architects: San Francisco Bay Area architecture firm focused on K-12 educational facilities, serving school districts throughout Northern California. Highly comparable to Plum in size, regional focus, K-12 specialization, and project types including libraries and classroom buildings.
• WLC Architects: Bay Area education-focused architecture firm serving K-12 and community college districts throughout Northern California. Comparable to Plum in target clients (public school districts), project types (modernizations, new construction, libraries), and regional service area.
• Noll & Tam Architects: Bay Area architecture firm with a strong K-12 and civic practice serving public school districts and municipalities across Northern California. Directly comparable to Plum in educational sector focus, regional Bay Area footprint, and project types (schools, libraries, community facilities).
• Quattrocchi Kwok Architects: Northern California firm specializing in K-12 educational facility design, with deep relationships across Bay Area school districts including work for SFUSD neighbors. Comparable to Plum in regional focus, education specialization, and project scale, but with a substantially larger team and broader district portfolio.
• Mark Cavagnero Associates: San Francisco architecture firm with significant civic, educational, and institutional project portfolio. Comparable to Plum in Bay Area focus, civic/institutional client base, and project sophistication, though operating at a larger scale on higher-profile public buildings.

Broad incumbents

• SmithGroup: National integrated design firm with a substantial K-12 and higher education practice, including California offices. Comparable to Plum in education sector focus and sustainability emphasis, but operating at much larger scale across multiple geographies and building types.
• Perkins&Will: Global architecture firm with significant education, civic, and adaptive reuse practices, including a San Francisco office. Comparable to Plum in sector focus and project types, but as a broad incumbent with significantly larger resources, broader geographic reach, and deeper R&D investment.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/plum-architects

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 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 Plum Architects