Halsted S. Welles Associates, Inc.

What Halsted S. Welles Associates, Inc. does

Halsted Welles Associates, Inc. (HWA) is a privately held New York City Design-Build-Maintenance firm founded in 1973 by Halsted Welles, specializing in high-end rooftop, terrace, and townhouse gardens for affluent residential clients. The company operates exclusively within NYC from its headquarters at 630 Flushing Avenue, Brooklyn, and serves a distinguished clientele through personalized design, installation, and ongoing maintenance services. Its core deliverables include site assessment and schematic design, material specifications, horticultural and lighting plans, regulatory approvals (Landmark preservation, Department of Buildings, Local Law 11), installation of garden structures, hardscape, and integrated systems, plus recurring maintenance encompassing seasonal planting, soil conditioning, and Integrated Pest Management.

The firm's technology is horticultural and craft-based rather than software-based: custom components of stone, wood, and metal; ecological design integrating native plant systems into the built environment; and integrated irrigation, lighting, and audio systems. No proprietary software, AI/ML capabilities, APIs, or digital platforms are disclosed. Execution is powered by a multi-disciplinary on-site team of designers, horticulturists, artisans, and support staff, supported by project management, estimating, procurement, and delivery functions.

HWA generates revenue through three professional-services streams: Design (project-based), Installation (project-based), and Maintenance (recurring/subscription). Go-to-market is sales-led, driven by earned media in Architectural Digest, Luxe Interiors + Design, New York Spaces, and other publications, plus referral-based lead flow through the NYC architectural and design community. Current operational leadership consists of three co-owners — Tim Vigen (CEO), Matthew Amos (COO), and Maggie Gyftogiannis (CAO) — with founder Halsted Welles now focused on ecological work on Long Island. The company is privately held with no disclosed funding, no parent company, and no disclosed revenue.

Name

Halsted S. Welles Associates, Inc.

Legal name

Halsted Welles Associates, Inc.

Website

https://halstedwelles.com

Company type

Private

Founded year

1973

Operating status

Operating

Headcount range

11–50 employees

Short description

Halsted Welles Associates (HWA) is a privately held NYC Design-Build-Maintenance firm, founded in 1973, that designs, installs, and maintains high-end rooftop, terrace, and townhouse gardens for affluent residential clients exclusively in New York City.

Ownership category

akta.pro rank

Product category

Landscape Architecture Services

NAICS

Landscape Architectural Services (54132), Landscaping Services (561730), Landscaping Services (56173)

SIC

Services-To Dwellings & Other Buildings (7340), Agricultural Services (700)

akta.pro primary industry

Landscape Construction Project Management & General Contracting (HSAIABAK)

akta.pro secondary industry

Outdoor Kitchens & Living Space Build-Out (Softscape Integration) (HSAIABAH)

Keywords

• Rooftop garden design
• Landscape architecture services
• Garden installation
• Garden maintenance services
• Urban garden design

Headquarters

HQ city

Brooklyn

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Infrastructure, Others

Revenue model

1. Design Services: Design services including site assessment, schematic design, material specifications, horticultural plans, lighting plans, irrigation plans, and regulatory approvals (Landmark preservation, Commission and Department of Buildings approvals).
2. Installation Services: Garden structure installation (treillage, fences, gates, walls, decks), garden elements (shade structures, cabinetry, heaters, custom planters, water features), garden systems (lighting, irrigation, audio), hardscape, and Local Law 11 projects.
3. Maintenance Services: Ongoing garden maintenance including seasonal and specimen planting, plant care and nourishment, soil amendments, hardscape and systems maintenance, and Integrated Pest Management.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Halsted Welles Associates (HWA) is a published New York City Design-Build-Maintenance firm specializing in rooftop, terrace, and townhouse gardens. The company delivers three integrated service lines: Garden Design (site assessment, schematic design, material specifications, horticultural and lighting plans, and landmark preservation approvals); Garden Installation (structures, hardscape, irrigation, lighting, audio systems, planters, water features, and Local Law 11 projects); and ongoing Garden Maintenance (seasonal planting, plant care, soil conditioning, hardscape maintenance, and Integrated Pest Management).

Product overview

Halsted Welles Associates (HWA) is a published New York City Design-Build-Maintenance firm offering a comprehensive suite of landscape architecture and horticultural services. The company operates as a single integrated service offering rather than a modular software platform. Its core portfolio consists of three interconnected service lines: Garden Design Services (site assessment, schematic design, material specifications, and landmark approvals), Garden Installation Services (structures, elements, systems, hardscape, and Local Law 11 compliance), and Garden Maintenance Services (seasonal planting, plant care, soil conditioning, and Integrated Pest Management). These services are applied across specialized garden types including Custom Rooftop Gardens, Terrace Gardens, Townhouse Gardens, and Communal Rooftop Gardens. The company is powered by a multi-disciplinary team of designers, horticulturists, artisans, and support staff, and is built on 50+ years of experience in urban ecological garden design.

Differentiator

Problem solved

Functional benefit

Products and services

• Garden Design Services Site assessment, schematic design and development, material specifications and construction details, horticultural, exterior lighting and irrigation plans, and regulatory approvals including Landmark preservation, Commission and Department of Buildings approvals for rooftop, terrace, and townhouse gardens in New York City.
• Garden Installation Services Installation of garden structures (treillage, fences, gates, walls, decks), garden elements (shade structures, cabinetry and storage, heaters, custom planters, water features), garden systems (lighting, irrigation, audio), hardscape paving, and Local Law 11 projects for New York City residential properties.
• Garden Maintenance Services Ongoing garden care including seasonal and specimen planting, plant health and nourishment, soil amendments and conditioning, hardscape and systems maintenance, and Integrated Pest Management for New York City rooftop, terrace, and townhouse gardens.

Named customers3 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

One partnership is on record.

• Independent DesignersminorStrategic or Co-development PartnerHWA collaborates with independent designers, offering its experience and resources for partnerships on garden design projects. Designers can contact the company to explore potential collaboration opportunities at [email protected].

Scale indicators2 records

Recent moves4 records

Expansion highlights4 records

Direct peers

• Thomas Balsley Associates: Thomas Balsley Associates is a NYC landscape architecture studio known for high-profile public and residential projects. Direct peer of HWA in urban landscape architecture, and a former employer of HWA's own landscape designer Brendan Higgins.
• Edmund D. Hollander Landscape Architect Design: Hollander Design is a New York-based landscape architecture firm specializing in high-end residential gardens, terraces, and country estates. Directly comparable to HWA in client type, NYC luxury positioning, and integrated design-build services for private residences.
• Oehme, van Sweden Landscape Architecture: Oehme van Sweden is a Washington DC-based landscape architecture firm with a national portfolio of high-end residential and estate gardens. Comparable to HWA in integrated design-build services, horticultural depth, and prestige-tier client base.
• Paul Morocco Landscape Architecture: Paul Morocco is a NYC landscape architect known for rooftop, terrace, and townhouse gardens for private residences. Direct competitor to HWA in the same niche of luxury urban garden design with similar rooftop/terrace specialization.
• Andrea Filippone Design: Andrea Filippone is a NJ/NYC-based landscape designer focused on high-end residential gardens, often featured in Architectural Digest and House & Garden. Comparable to HWA in clientele, press recognition, and custom garden design scope.

Emerging players

• Latice Landscape Architecture: Latice is a NYC landscape architecture practice working on residential terraces, rooftops, and small urban gardens. Emerging peer comparable to HWA in niche focus on urban residential outdoor living spaces in NYC.
• Topographic Garden Design: Topographic is a NYC-based garden and terrace design practice serving luxury residential clients. Emerging peer comparable to HWA in rooftop/terrace specialization, though at smaller scale and with a more contemporary minimalist aesthetic.
• WM Design + Architecture: WM Design + Architecture is a NYC landscape and garden design firm serving high-end residential and boutique commercial clients. Emerging peer comparable to HWA in luxury NYC garden design, with overlap in rooftop and terrace project typologies.

Broad incumbents

• James Corner Field Operations: Field Operations is a globally recognized landscape architecture firm behind High Line and large-scale public projects. Comparable to HWA in urban landscape architecture but operates at much larger scale across public realm, infrastructure, and master planning rather than boutique residential.
• Nelson Byrd Woltz Landscape Architects: Nelson Byrd Woltz is an established landscape architecture firm working on estates, cultural landscapes, and ecological design. Comparable to HWA in design-build execution and ecological/horticultural depth, but operates nationally at larger scale and broader typology.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/halstedwelles
• LinkedInlinkedin.com/company/halsted-welles-associates

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 Halsted S. Welles Associates, Inc.