Stephen Tilly Architect

What Stephen Tilly Architect does

Stephen Tilly Architect is a privately-held architecture practice founded in 1985 and headquartered in a repurposed collection of 19th century buildings at 22 Elm Street, Dobbs Ferry, New York. The firm provides professional architectural design services organized across five integrated service lines: Historic Preservation, Adaptive Reuse, New Construction, Residential, and Community. Its work emphasizes climate-responsive design, sustainable building practices, low-carbon materials, and energy efficiency, with the stated mission of creating, rehabilitating, and preserving environments that address climate change from concept through construction detail.

The firm's portfolio spans a diverse mix of institutional, religious, cultural, community, and residential clients primarily in Westchester County and the broader New York metropolitan area, with select projects executed in New Jersey. Notable engagements include the adaptive reuse of Sarah Lawrence College's Center for the Urban River at Beczak, the Sharp Sustainability Education Center at Ramapo College in Mahwah, NJ, the preservation of the 1916 Maverick Concert Hall in Woodstock, NY, and the Warburton Affordable Housing development in Hastings on Hudson. The firm serves educational institutions, religious congregations, community developers, and municipal/cultural entities through direct engagement.

The business operates as a project-based professional services firm, generating revenue through design, planning, and construction administration fees quoted on a project-by-project basis. The practice is founder-led by Stephen Tilly, the named principal architect, with no disclosed institutional investors, parent company, partnerships, or external ownership. Distribution is regional and relationship-driven, supported by a website portfolio that showcases completed work as the primary marketing channel. The firm reports 11-50 employees and operates with no disclosed digital platform, proprietary technology, or AI capabilities.

Name

Stephen Tilly Architect

Legal name

Stephen Tilly, Architect

Website

https://stillyarchitect.com

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

11–50 employees

Short description

Stephen Tilly Architect is a privately-held architecture practice founded in 1985 in Dobbs Ferry, NY, providing historic preservation, adaptive reuse, new construction, residential, and community design services with a focus on climate-responsive, sustainable building practices across the New York metropolitan area.

Ownership category

akta.pro rank

Product category

Architectural Services

NAICS

Architectural Services (54131)

SIC

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

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industry

Interior Design Services (BPAHAKAB)

Keywords

• Historic preservation architecture
• Adaptive reuse design
• Sustainable building design
• Residential architecture services
• Community development planning

Headquarters

HQ city

Dobbs Ferry

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, Infrastructure

Revenue model

1. Architectural Design Services: Professional architecture services including historic preservation, adaptive reuse, new construction, residential, and community projects. Revenue is generated through project-based fees for design, planning, and construction administration services.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Stephen Tilly Architect is a regional architecture practice providing integrated design services across five lines: historic preservation, adaptive reuse, new construction, residential, and community-focused projects. The firm delivers design, planning, and construction administration services for institutional, religious, educational, governmental, nonprofit, and private residential clients, with climate-responsive design and low-carbon materials applied across all engagements.

Product overview

Stephen Tilly, Architect is an architectural firm offering five integrated service lines: Historic Preservation, Adaptive Reuse, New Construction, Residential, and Community projects. The firm specializes in creating, rehabilitating and preserving environments that address climate change through energy-efficient design, low-carbon materials, and sustainable building practices. Projects range from individual residences to institutional buildings, with the studio located in Dobbs Ferry, NY serving the New York metropolitan region.

Differentiator

Problem solved

Functional benefit

Products and services

• Historic Preservation Preservation services for historic buildings, including restoration and conservation work to maintain architectural heritage. Intended for institutions, congregations, municipalities, and nonprofits seeking to preserve significant cultural landmarks such as the Maverick Concert Hall (1916) and Congregation Shearith Israel.
• Adaptive Reuse Transforms existing buildings for new purposes and continuing use, breathing new life into old structures to meet present needs. Applied to educational institutions such as Sarah Lawrence College's Center for the Urban River at Beczak.
• New Construction Design and construction of new buildings with focus on environmental cues, low-carbon materials, and sustainable delivery modes. Delivered for institutional and educational clients such as Ramapo College (Sharp Sustainability Education Center) and North Country School.
• Residential Custom residential architecture services for private homes in the Westchester County region, exemplified by the Hudson Chateau residence.
• Community Community-focused architectural projects including affordable housing and community development initiatives. Representative project: Warburton Affordable Housing in Hastings on Hudson, NY.

Named customers8 records

Segments5 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators1 record

Recent moves4 records

Expansion highlights3 records

Direct peers

• WXY architecture + urban design: NY-based firm with strong community development, civic, and sustainability focus. Comparable to STA's community/affordable housing and adaptive reuse segments, particularly in projects emphasizing public engagement and existing building transformation.
• TenBerke (formerly Deborah Berke Partners): NY-based architecture firm with strong institutional, cultural, and residential portfolio emphasizing sustainability and contextual design. Comparable to STA in regional focus, project types (institutional, residential, cultural), and sustainability orientation.
• Beyer Blinder Belle Architects: NYC-based architecture firm specializing in historic preservation, adaptive reuse, and institutional projects. Highly comparable to STA given shared emphasis on landmark preservation (Grand Central Terminal, Brooklyn Academy of Music) and adaptive reuse work in the same regional market.
• Marmol Radziner: Architecture and design practice specializing in adaptive reuse, restoration, and residential work with strong sustainability credentials. Comparable to STA's adaptive reuse and preservation services though operating primarily on the West Coast.
• Selldorf Architects: NY-based architecture practice known for cultural, institutional, and adaptive reuse projects with a sensitivity to context and materials. Comparable in scale and typology to STA's institutional and preservation work in the NY metro region.

Emerging players

• Canning Studios (formerly John Canning & Co.): Specialist in historic preservation, restoration, and conservation of significant architectural landmarks. Comparable to STA's preservation service line though focused primarily on interior restoration and decorative conservation rather than full architectural design.
• Walter B. Melvin Architects: NY-based firm specializing in historic preservation, restoration, and adaptive reuse of landmark buildings. Closely comparable to STA on preservation-focused service line, though operating at a smaller scale with a narrower institutional focus.

Broad incumbents

• Ennead Architects: Established NY architecture firm with major institutional, cultural, and civic portfolio. Comparable to STA in serving educational and cultural institutions in the region, but at substantially larger scale and project scope.
• Perkins Eastman: Large, established architecture firm with significant historic preservation, senior living, and institutional practices in the Northeast. Overlaps with STA on preservation and institutional work but operates at much greater scale across many market segments.
• FXCollaborative: Major NY architecture firm with strong sustainability practice and broad institutional portfolio. Overlaps with STA on sustainable design and adaptive reuse but at significantly larger scale across mixed-use, commercial, and institutional segments.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/stephen-tilly-architect

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Stephen Tilly Architect