HDA

Architectural Serviceshdai.com

HDA is a St. Louis-based private architecture, interior design, and master planning firm founded in 1986, serving the construction and engineering sectors through a small professional services team of 11 to 50 employees.

Company typePrivate
Founded1986
HeadquartersSt Louis, United States
Headcount11–50
GTM type—
OfferingServices

What HDA does

HDA is a private, for-profit professional services firm founded in 1986 and headquartered in St. Louis, Missouri. The company delivers solutions across three core disciplines—architecture, interior design, and master planning—within the construction and engineering fields. Based on the limited publicly available data, HDA operates as a small practice with 11-50 employees, suggesting a boutique or mid-sized studio model rather than a large enterprise firm. The firm's website (hdai.com) represents its identified digital presence, though substantive product, service detail, or technology platform information was not extractable from the available source content.

The business model is characteristic of professional services firms in the architecture and design space: revenue is most likely generated through project-based fees tied to architecture, interior design, and master planning engagements. Pricing models, contract structures, customer segments, and go-to-market channels were not disclosed in the available data. There is no information on technology stack, proprietary tools, AI integration, partnerships, awards, or certifications. The firm has operated continuously since its 1986 founding, indicating a sustained presence in the U.S. construction and engineering services market, though its growth trajectory and current scale remain unclear from available sources.

HDA firmographics

Firmographics

Name: HDA
Website: https://hdai.com
Company type: Private
Founded year: 1986
Headcount range: 11–50 employees
Short description: HDA is a St. Louis-based private architecture, interior design, and master planning firm founded in 1986, serving the construction and engineering sectors through a small professional services team of 11 to 50 employees.
Ownership category
akta.pro rank

HDA industry classification

Industry

Product category: Architectural Services
NAICS: Architectural Services (54131), Architectural Services (541310), Interior Design Services (54141), Interior Design Services (541410), Architectural, Engineering, and Related Services (5413)
akta.pro primary industry: ADU Design, Architecture & Engineering (HSAPAMAF)
akta.pro secondary industries: Residential Design-Build & Renovation-Integrated Builders (IMAFABAE), Residential Interior Fit-Out (Multi-Family & High-End) (IMAFANAE)

Keywords

Architectural services
Interior design
Master planning
Construction engineering
Building design

Where HDA is headquartered

Location

Headquarters

HQ city: St Louis
HQ country: United States
HQ region: North America

Markets served

HDA product offering

Product offering

Core offering

HDA offers solutions in architecture, interior design, and master planning services within the construction and engineering fields. The firm delivers design and planning expertise for building and infrastructure projects based in St Louis, United States, founded in 1986.

Differentiator

Problem solved

Functional benefit

Products and services

Architectural Design Services Architectural design solutions for construction and engineering projects, serving organizations requiring building design expertise.
Interior Design Services Interior design solutions provided to clients in the construction and engineering fields.
Master Planning Services Master planning solutions for construction and engineering projects, providing site and project-level planning expertise.

Companies that use HDA

Customer profile

Ideal customer profiles1 record

HDA technology and API

Technology

Technology focussed No

API detail

Has API: No
API docs
API detail

Core technology

AI maturity

App detail

HDA competitors and assessment

Company assessment

Broad incumbents

HOK: HOK is a global architecture, engineering, and planning firm with deep St Louis roots and a broad portfolio spanning corporate, healthcare, aviation, and sports. It is comparable as a multi-discipline design firm competing for the same institutional and developer clients in the St Louis region.
Gensler: Gensler is a global architecture, design, and planning firm with significant offices across the US. Comparable to HDA on interior design and master planning offerings, though operating at vastly greater scale.
Perkins&Will: Perkins&Will is a global architecture and design firm with deep practices in healthcare, education, and urban design. It is a broad incumbent competing for the same institutional and master planning commissions HDA targets.
SmithGroup: SmithGroup is a large integrated architecture, engineering, and planning firm serving higher education, healthcare, and workplace clients. Comparable to HDA on the combination of architecture, interiors, and master planning capabilities.
CannonDesign: CannonDesign is a national architecture, engineering, and planning firm with strong higher education and healthcare practices. It is a broad incumbent that competes with HDA on institutional master planning and design work.

Direct peers

Christner Inc. Christner is a St Louis-based architecture and planning firm offering services across higher education, healthcare, and civic projects. It directly competes with HDA on local master planning and architectural commissions of comparable scale.
Arcturis: Arcturis is a St Louis architecture and design practice working in commercial, healthcare, education, and urban mixed-use sectors. It is a direct local peer competing for similar developer and institutional clients in the same metro.
Mackinlay Woltosz Partnership: Mackinlay Woltosz Partnership (MWP) is a St Louis architecture and interior design firm serving commercial, institutional, and residential clients. It is directly comparable in service mix, scale, and regional focus to HDA.
KAI Enterprises: KAI is a St Louis-based design-build and architecture firm offering architecture, engineering, and interior design across multiple markets. Comparable to HDA on integrated multi-discipline delivery and regional presence.
KTGY Architecture + Planning: KTGY is a national architecture and planning firm specializing in residential, mixed-use, and master planning developments. Comparable to HDA on master planning and architectural services, particularly for developer-led and residential projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat2 records

Key risks5 records

Key highlights5 records

Customer concentration

HDA financial estimates

Financial estimate

Revenue estimate

Valuation estimate

HDA leadership team

Management profile

Number of profiles

HDA funding detail

Funding detail

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

HDA M&A and investment

M&A and investment

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about HDA

What does HDA do?

When was HDA founded?

HDA was founded in 1986. It employs 11 to 50 people.

Where is HDA based?

HDA is headquartered in St Louis, United States, in the North America region.

Who are HDA's main competitors?

Broad incumbents on record are HOK, Gensler, Perkins&Will, SmithGroup and CannonDesign. Direct peers are Christner Inc., Arcturis, Mackinlay Woltosz Partnership, KAI Enterprises and KTGY Architecture + Planning.

Does HDA have an API?

No public API is recorded for HDA.

What industry is HDA in?

HDA's product category is Architectural Services. Its primary akta.pro industry code is HSAPAMAF, ADU Design, Architecture & Engineering, with a secondary code of IMAFABAE, Residential Design-Build & Renovation-Integrated Builders. Its NAICS code is 54131.