rhiza A+D

What rhiza A+D does

rhiza A+D (rhiza Architecture + Design) is a privately held architecture and design-build firm founded in 2005 in Portland, Oregon, operating as rhiza A+D LLC. The firm is owned and operated by four founding partners — Ean Eldred, Richard Garfield, John Kashiwabara, and Peter Nylen — who have collaborated continuously since the mid-1990s, supported by at least one in-house fabricator (Eva Morris). The business combines a design studio with a building workshop certified in steel and aluminum welding, allowing seamless integration from schematic design through fabrication and installation. Core offerings span full-service architecture (planning, schematic design, construction documentation, permitting, construction administration) for residential new homes, ADUs, additions, and remodels; commercial new structures, adaptive re-use, and tenant improvements; and cultural projects including public art and historic landmark work. Design-build services deliver custom exterior landscape elements, architectural interior and exterior elements, furnishings, and prefab structures; a growing productized line includes the Prefab Garden Pavilion (1.0 and 2.0) and Prefab Shoji Studio. Revenue is generated through custom project-based professional services engagements plus one-time prefab product sales; pricing is quote-based with no public tiers, and contracts run multi-year. Clients range from individual homeowners (primary) to commercial operators (e.g., Hunt & Gather Events and Catering) and government agencies across Oregon, Washington, Tennessee, and beyond.

Name

rhiza A+D

Legal name

rhiza A+D LLC

Website

https://rhizaaplusd.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

1–10 employees

Short description

rhiza A+D is a Portland-based architecture and design-build firm offering full-service design, in-house metal fabrication, and prefab pavilion products to individual homeowners, commercial clients, and government agencies across the Pacific Northwest and select U.S. cities.

Ownership category

akta.pro rank

Product category

Architecture Services

NAICS

Industrial Design Services (541420), Industrial Design Services (54142)

SIC

General Bldg Contractors - Residential Bldgs (1520)

akta.pro primary industry

Residential Design-Build & Renovation-Integrated Builders (IMAFABAE)

akta.pro secondary industries

Industrial/Product & Furniture Design (BPAHAKAM), Community Engagement & Participatory Planning (BPAHAKAO)

Keywords

• Architecture services
• Design-build services
• Custom metal fabrication
• Prefab structures
• Public art commissions

Headquarters

HQ city

Portland

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Architecture and Design Services: Full-service architecture from planning, schematic design, design development, construction documentation, permitting, bid/estimate/negotiating to construction administration. Includes residential (new homes, ADUs, additions, remodels), commercial, and cultural projects.
2. Design-Build Services: In-house design-build for custom exterior landscape, art elements, architectural interior and exterior elements, furnishings, and prefab structures. Includes fabrication and installation.
3. Prefab Product Sales: Prefabricated pavilion structures sold and installed for clients, including Prefab Garden Pavilions (200sf) and Shoji Studio.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

rhiza A+D provides architecture, design-build, and public art services through an integrated practice that combines design with an in-house fabrication workshop. The firm delivers custom architectural projects, prefab structures including the Garden Pavilion and Shoji Studio, and commissioned artwork, serving clients ranging from individual homeowners to city agencies.

Differentiator

Problem solved

Functional benefit

Products and services

• Architecture Services Full architectural design services for residential, commercial, institutional, and civic projects, delivered as part of rhiza A+D's integrated design-build practice.
• Design-Build Services Integrated design and construction delivery combining architectural design with the firm's in-house fabrication workshop, allowing projects to move from concept through fabrication under a single firm.
• Public Art Services Commissioned artwork and sculptural installations produced in rhiza A+D's fabrication workshop for civic, institutional, and private clients.
• Custom Metal Fabrication Bespoke metalwork and millwork produced in rhiza A+D's in-house fabrication workshop for architectural projects, public art, and prefab components.
• Prefab Garden Pavilion Prefabricated garden pavilion structure produced by rhiza A+D as a standardized design-forward product for residential and small-scale buyers.
• Prefab Shoji Studio Prefabricated shoji-style studio structure designed and fabricated by rhiza A+D as a standardized product in its prefab structures line.

Named customers5 records

Segments3 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

One partnership is on record.

• Portland Opera to Go!minorStrategic or Co-development PartnerDesigning set for mobile opera 'Shizue: An American Story' presented by Portland Opera to Go!, part of their 'Our Oregon Series' youth operas highlighting Oregonian experiences.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• Hacker Architects: Portland-based architecture firm with deep residential, cultural, and civic portfolio. Comparable to rhiza as a similarly sized Portland practice serving overlapping client segments across residential and cultural/institutional work.
• Fieldwork Design: Portland architecture and design-build firm focused on craft-driven residential and small commercial projects. Comparable to rhiza A+D's design-plus-fabrication model and Pacific Northwest residential focus.
• Allied Works Architecture: Portland architecture firm known for cultural, residential, and institutional work with a strong material-craft focus. Comparable to rhiza in Portland base and emphasis on bespoke detail across residential and cultural projects.
• Mutuus Studio: Seattle-based design-build architecture practice integrating fabrication and craft into residential and small commercial projects. Directly comparable to rhiza A+D's integrated design-and-make approach in the Pacific Northwest.
• Lake|Flato: San Antonio-based architecture firm celebrated for craft, regional modernism, and integration of design with making. Comparable to rhiza A+D in combining a small studio ethos with hands-on fabrication sensibilities across residential and cultural work.
• Olson Lewis + Associates: Portland-based architecture and interiors practice working across residential and commercial projects. Comparable to rhiza A+D as a similarly scaled Portland firm in the regional residential/commercial architecture market.
• Skylab Architecture: Portland architecture and design studio with a portfolio spanning residential, commercial, hospitality, and cultural projects. Comparable to rhiza as a Portland-headquartered design studio serving similar client types.
• Olson Kundig: Seattle-based architecture and design-build firm famous for integrating custom metal fabrication and 'machine-like' detailing into residential and cultural projects. Highly comparable to rhiza A+D's combined architecture-plus-in-house-workshop model and craft-driven ethos.
• Build LLC: Portland architecture and design-build studio working on residential, commercial, and interiors projects with hands-on maker culture. Directly comparable to rhiza A+D's design studio + workshop integration in the same Portland market.

Broad incumbents

• ZGF Architects: Large, established Portland-headquartered architecture firm operating broadly across healthcare, civic, commercial, and residential sectors. Overlaps with rhiza in Portland architectural market but at vastly greater scale and project complexity.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Instagraminstagram.com/rhizaaplusd
• LinkedInlinkedin.com/company/rhiza-a-d

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 rhiza A+D