O'SULLIVAN ARCHITECTS

What O'SULLIVAN ARCHITECTS does

O'Sullivan Architects is a Reading, Massachusetts-based architecture practice founded in 1997, operating with a 12-person team across multifamily residential, mixed-use, commercial, historic preservation, and sustainable/Passive House design. Its work is concentrated in the New England and Greater Boston region, with documented projects including a 76-unit multifamily development in Melrose in partnership with Szecon Development and 20+ repeat engagements for East Boston Savings Bank. The firm holds multi-state architectural licensure, LEED and Passive House accreditation, and maintains active affiliations with AIA and HBRAMA; principal David O'Sullivan was installed as 2025 HBRAMA President and Jon Stone was elevated to part-owner after 24 years with the firm.

The firm delivers services through traditional project-based architectural engagements, supported by technical capabilities in zoning and regulatory navigation (notably Massachusetts Chapter 40B), historic preservation, and sustainable design certification. Its business model is professional service fee-based, with no public pricing — engagements are quoted per project. Go-to-market is sales-led and relationship-driven, relying on referrals, developer and municipal relationships, industry association memberships, and a recently launched online initial consultation booking channel that lowers friction for prospective clients. No AI/ML or proprietary technology products are part of the offering; the practice competes on talent credentials, regulatory expertise, and project execution.

Name

O'SULLIVAN ARCHITECTS

Legal name

O'Sullivan Architects

Website

https://osullivanarchitects.com

Company type

Private

Founded year

1997

Operating status

Operating

Headcount range

1–10 employees

Short description

O'Sullivan Architects is a Reading, MA-based architecture firm founded in 1997, serving New England and Greater Boston with a 12-person team across multifamily, mixed-use, commercial, historic preservation, and Passive House design via project-based professional services.

Ownership category

akta.pro rank

Product category

Architectural Services

NAICS

Architectural Services (54131), Interior Design Services (54141)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industries

Landscape Architecture & Site Design (BPAHAKAC), Custom Home Building (IMAFABAC), Senior Living & Assisted Living Facility Construction (IMAFACAJ), Luxury Whole-Home Renovation (High-End Finishes & Custom Build) (HSAPAEAI)

Keywords

• Multifamily architectural design
• Mixed-use development architecture
• Historic preservation services
• Sustainable building design
• Commercial architecture services

Headquarters

HQ city

Reading

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Architectural Design Services: O'Sullivan Architects generates revenue through professional architectural service fees for designing multifamily residential, mixed-use developments, commercial projects, historic renovations, and custom residential homes. Revenue is project-based, sourced from developers, property owners, municipalities, and commercial clients across New England.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels9 records

Core offering

O'Sullivan Architects is a full-service architecture firm providing design services for multifamily residential, mixed-use, commercial, and historic preservation projects across New England. The firm delivers architectural design, municipal approval navigation, LEED/Passive House sustainable design, and multidisciplinary coordination with engineers, consultants, and contractors.

Product overview

O'Sullivan Architects is a full-service architecture firm offering a unified portfolio of design services centered on multifamily residential design, mixed-use developments, and land planning. The firm's core offering encompasses architecture and design services for residential (single-family, multifamily, suburban, urban), commercial, and mixed-use projects, complemented by historic preservation and renovation capabilities. Supporting services include sustainable/green design with LEED and Passive House expertise, municipal approval navigation and zoning consultation, feasibility studies, and an initial 30-minute consultation module. The practice serves clients throughout New England from its Reading, Massachusetts office.

Differentiator

Problem solved

Functional benefit

Products and services

• Architecture and Design Services Full-service architecture firm providing residential and commercial design services, including historic restorations, modern designs, renovations, and new construction projects for developers, property owners, and municipalities.
• Multifamily Residential Design Specialized design services for multifamily residential developments including apartments, condominiums, and mixed-income housing communities for developers and housing authorities.
• Mixed-Use Development Design Design services combining residential and commercial spaces within a single development, integrating retail, office, and living spaces for developers and property owners.
• Commercial Architecture Design services for commercial projects including retail spaces, offices, and institutional buildings for businesses and organizations.
• Historic Preservation and Restoration Expert services for historic building preservation, adaptive reuse, and renovation projects that maintain architectural heritage while modernizing functionality.

Named customers1 record

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Eleven partnerships are on record, tiered core, flagship and minor.

• Szecon DevelopmentcoreStrategic or Co-development PartnerO'Sullivan Architects collaborated with Szecon Development on a 76-unit sustainable multifamily development in Melrose, MA, which received ZBA approval. The project features Passive House design, over 2,000 square feet of amenity spaces, and proximity to MBTA transit.
• American Institute of Architects (AIA)coreOthersO'Sullivan Architects is a member of the American Institute of Architects. Principal David O'Sullivan holds AIA membership and the firm displays the AIA logo as part of its affiliations.
• National Council of Architectural Registration Boards (NCARB)coreOthersO'Sullivan Architects maintains affiliation with NCARB, supporting architectural licensure standards across multiple states.
• U.S. Green Building Council (USGBC)coreOthersAffiliation with USGBC reflects the firm's commitment to sustainable design and LEED certification expertise, with team members holding LEED AP credentials.
• National Association of Home Builders (NAHB)coreOthersDavid O'Sullivan is active with NAHB; the firm has received multiple awards from NAHB including Best of 55+ Housing Silver Awards.
• Home Builders & Remodelers Association of Massachusetts (HBRAMA)flagshipOthersDavid O'Sullivan, principal of O'Sullivan Architects, was installed as the 2025 President of HBRAMA. This leadership position represents the firm's highest-profile industry role and enables significant influence over Massachusetts housing policy and industry standards.
• Builders and Remodelers Association of Greater Boston (BRAGB)coreOthersO'Sullivan Architects is a member of BRAGB and is a highly recognized recipient of multiple PRISM Awards from this organization over the years.
• Boston Society of Architects (BSA)coreOthersAffiliation with BSA connects the firm to the Boston architecture community and local design standards.
• Reading Chamber of CommerceminorOthersLocal chamber affiliation supporting community connections in the Reading, MA area where the firm's headquarters is located.
• Better Business Bureau (BBB)minorOthersBBB accreditation provides consumer trust and credibility for the firm's professional services.
• 50+ New England Housing CouncilcoreOthersThe firm has received multiple awards from this council, recognizing excellence in active adult and multi-family housing design across New England.

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• Hacin + Associates: Boston-based boutique architecture firm with multifamily residential and mixed-use expertise. Comparable size, similar regional focus, and similar client base of developers, property owners, and municipalities in the New England market.
• CBT Architects: Boston-based architecture firm with extensive multifamily and mixed-use project history before integration into Stantec. Comparable as a major Boston architecture competitor pursuing similar large-scale New England residential and mixed-use developments.
• Merge Architects: Boston-based boutique architecture firm focused on multifamily residential, mixed-use, and community-focused design. Similar size and comparable project portfolio to O'Sullivan Architects with overlapping client base in the Greater Boston region.
• The Architectural Team (TAT): Chelsea, MA-based architecture firm of comparable size specializing in multifamily residential, mixed-use, and hospitality projects across New England. Directly comparable as a similarly-sized competitor with overlapping service offerings, multifamily focus, and regional footprint targeting the same developer and municipal clients.
• DiMella Shaffer: Boston-area architecture firm with strong multifamily residential, hospitality, and mixed-use portfolio. Directly comparable as a competitor for similar developer relationships and project types across New England with similar scale and regional focus.

Regional players

• Sasaki Associates: Watertown, MA-based planning, urban design, and architecture firm with significant New England presence and master planning capabilities. Competes for similar regional development projects at a slightly larger scale with broader planning and landscape capabilities.

Broad incumbents

• HOK: Global architecture firm with substantial presence in residential, mixed-use, and commercial design. Competes for large institutional multifamily and mixed-use projects across the Northeast with deep firm-level resources.
• NBBJ: Global architecture and design firm with broad multifamily, mixed-use, and commercial portfolio. Competes for larger-scale regional projects with significant firm-level resources and brand reputation, often pursuing institutional-grade developments.
• Perkins&Will: Global architecture firm with Boston studio providing architectural services for multifamily, mixed-use, and institutional projects. Competes for large-scale developments in New England, drawing on significant global resources and brand recognition.
• Stantec: Global design and engineering firm with significant Boston presence following CBT Architects acquisition. Offers comprehensive architecture services across multifamily, mixed-use, and commercial segments, representing a larger-scale competitor entering the same Massachusetts market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/o_sullivan_arch
• Facebookfacebook.com/osullivanarch
• LinkedInlinkedin.com/company/o'sullivan-architects-inc
• Instagraminstagram.com/osullivanarchitects

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 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 O'SULLIVAN ARCHITECTS