Hanging Gardens

What Hanging Gardens does

Hanging Gardens, LLC is a Milwaukee-based, privately held green infrastructure and stormwater management company founded in 2002. The firm curates and distributes a portfolio of more than 400 products — organized into Rooftops, On Grade, and Below Grade categories — covering vegetated roof systems (extensive, semi-intensive, intensive, plus specialty Food Roof and Hops Roof variants), blue roofs, stormwater harvesting and infiltration cells, permeable pavers, waterproofing, root barriers, drainage, growing media, vegetation, and proprietary monitoring and leak-detection systems such as Greenformation®, Smartex®, EFVM, and Electronic Leak Detection (ELD). Underlying technology includes IoT-style sensor monitoring (soil moisture, leaf wetness, cameras, leak detection), a web-based cloud computing Smart Drain system that uses optimization algorithms with real-time weather data to schedule stormwater release across networked blue roofs, and a ceramic-based Microporous Paver System that maintains high long-term infiltration rates.

The company monetizes through two streams: hardware product sales across the HG 2000–8000 catalog, and a six-step professional services engagement (Initial Review, Systems Integration, Design Integration, Grant Procurement, Project Delivery, and Maintenance/Monitoring). Go-to-market is sales-led and project-based, with direct enterprise engagement of building owners, architects, and project teams, supplemented by a nationwide network of certified contractors for installation and a maintenance partnership with AD Greenroof. Customers span commercial real estate, municipalities, institutional/educational facilities, hospitality, residential, and craft brewery/agriculture verticals, with named projects across the U.S. and Canada. Pricing is quote-based per project, and the company does not publicly disclose pricing.

Name

Hanging Gardens

Legal name

Hanging Gardens LLC

Website

https://hanging-gardens.com

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

11–50 employees

Short description

Hanging Gardens is a Milwaukee-based green infrastructure firm that curates 400+ stormwater management and vegetated roofing products and delivers project-based consulting, design integration, and maintenance services to commercial, municipal, institutional, and residential clients across the U.S. and Canada.

Ownership category

akta.pro rank

Product category

Green Infrastructure and Stormwater Management

NAICS

Landscaping Services (561730)

akta.pro primary industry

Roof-Mounted Systems Integration (PV, Green Roofs, Roof Gardens, Snow Guards) (IMAFAMAI)

Keywords

• Stormwater management solutions
• Green infrastructure systems
• Vegetated roofing systems
• Permeable pavement products
• Consulting services stormwater

Headquarters

HQ city

Milwaukee

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Product Sales: Sale of 400+ green infrastructure components and systems including vegetated roof systems, permeable pavers, drainage components, stormwater harvesting cells, and related materials for stormwater management applications.
2. Professional Services: Comprehensive service offerings including Initial Review, Systems Integration, Design Integration, Grant Procurement, Project Delivery, and Maintenance/Monitoring services.
3. Grant Procurement Services: Assistance finding financial incentives for green infrastructure and stormwater management projects, helping clients take advantage of available grants and funding opportunities.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Hanging Gardens sells 400+ green infrastructure products and systems for stormwater management, organized across rooftop (vegetated roofs, blue roofs), on-grade (permeable pavers, bioswales), and below-grade (stormwater harvesting and infiltration) installation categories. The company complements these physical products with professional consulting services covering initial project review, systems and design integration, grant procurement, project delivery, and post-installation maintenance and monitoring.

Product overview

Hanging Gardens is a green infrastructure company offering a comprehensive portfolio of 400+ products and systems for stormwater management. The portfolio is organized across three installation categories (Rooftops, On Grade, Below Grade) and includes: (1) Systems - vegetated roof systems (HG 2000 series) ranging from extensive sedum roofs to intensive rooftop gardens, plus stormwater systems for harvesting, infiltration, and permeable paving; (2) Components - the HG 3000-8000 series covering waterproofing, root barriers, drainage/retention boards, growing media, vegetation, pavers, pedestals, and monitoring equipment; (3) Services - six service offerings from initial review through project delivery and ongoing maintenance. The company provides complete solutions by combining multiple product categories into integrated systems tailored to each project's aesthetic and functional requirements.

Differentiator

Problem solved

Functional benefit

Products and services

• HG 2100 - Extensive Vegetated Roofs Extensive vegetated roof system using drought-tolerant plantings such as sedums, available in variants including Sedum Cuttings, Perennial Plugs, Cuttings/Plugs Hybrid, Sedum Mat, Sedum Tile, and Sedum Tray.
• HG 2200 - Semi-Intensive Vegetated Roofs Semi-intensive vegetated roof system with expanded plant palettes including perennials, ornamental grasses, shrubs, and evergreens. Variants include Perennial Garden, Native Prairie, Food Roof, and Hops Roof.
• HG 2300 - Intensive Vegetated Roofs Intensive vegetated roof system supporting large plant palettes including trees and shrubs, with Formal Roof Garden, Informal Roof Garden, and Plaza Deck Garden variants.
• HG 2500 - Stormwater Roofs Stormwater management roof systems that maximize retention while allowing design creativity, including Blue Roof (HG 2510), Stormwater Catchment (HG 2530), Hybrid Blue and Green Roof (HG 2540), and Recycled Irrigation Garden (HG 2550).
• HG 2610 - Stormwater Harvesting Porous Parking Stall System that captures and stores stormwater runoff in sub-surface infiltration storage tanks, scalable from individual parking stalls to larger configurations with optional bioswale integration and smart valve controls.
• HG 2640 - FlowPro Permeable Pavers High-strength compressed concrete permeable pavers that filter stormwater through joints while supporting pedestrian and vehicular traffic. Engineered to capture pollutants and comply with freeze/thaw durability testing.
• HG 2660 - Microporous Paver System Ceramic-based porous paving unit with microscopic pores that do not clog, installed flush to reduce cracking risk, offering exponentially higher long-term infiltration rates with minimal maintenance requirements.
• Greenformation Monitoring System High-tech monitoring system using 24/7 feed cameras, soil moisture monitors, leaf wetness sensors, and interactive websites for data reporting to ensure maximum system vitality without physical site visits.
• Smartex Leak Detection System Permanently installed sensor modules under the roofing membrane connected to an online computerized system providing 24/7 monitoring with pinpoint leak location and time-of-occurrence tracking.
• HG 1100 - Initial Review Initial project assessment service that evaluates stormwater mitigation potential and explores opportunities for incorporating stormwater technology, with optional LEED consultation.
• HG 1200 - Systems Integration Customized review session that helps clients understand system options and find optimal solutions for project aesthetic and functional requirements, including stormwater holding calculations.
• HG 1300 - Design Integration Expert architectural collaboration to design, specify, and create unique systems that achieve client vision using over 300 proven products from the global catalog.
• HG 1400 - Grant Procurement Assistance identifying and applying for financial incentives and grant opportunities available for green infrastructure and stormwater management projects.
• HG 1500 - Project Delivery Comprehensive project management including shipping and logistics coordination, contractor network management, project close-out, and system warranties.
• HG 1600 - Maintenance/Monitoring Post-installation monitoring using the Greenformation system with 24/7 feeds, soil sensors, and data reporting, plus remediation consulting and on-site maintenance services.

Quantifiable outcome

• Stormwater held on-site instead of contributing to sewer overflow
• +1 more outcomes

Named customers10 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Four partnerships are on record, tiered core and supporting.

• AD GreenroofcoreImplementation/ SI/ Consulting PartnerHanging Gardens has teamed up with AD Greenroof to perform specialized maintenance services with local crews across the U.S. AD Greenroof is a site inspector and contractor trainer for Hanging Gardens' systems and products.
• International Vendors and ManufacturerscoreTechnology or IntegrationHanging Gardens partners with international vendors and manufacturers to bring state-of-art technologies and products for stormwater management to the North American market. They are described as the largest marketing organization for green infrastructure for stormwater management products.
• Municipal Testing FacilitiessupportingImplementation/ SI/ Consulting PartnerHanging Gardens partners with numerous testing facilities depending on necessary product testing required for projects. They work with municipalities on pilot projects and green infrastructure programs.
• U.S. Green Building Council (USGBC)supportingStrategic or Co-development PartnerRecognition through USGBC Wisconsin Leadership Awards for stormwater management projects. The company supports clients in achieving LEED certification.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• American Hydrotech: American Hydrotech manufactures waterproofing membranes (Monolithic Membrane 6125) widely used as the substrate beneath vegetative roof assemblies. Comparable to Hanging Gardens' HG 3100 waterproofing line as a combined waterproofing-plus-green-roof systems provider.
• LiveRoof: LiveRoof is a global supplier of modular pre-vegetated green roof systems with a sizeable North American installer network. Overlaps directly with Hanging Gardens' HG 2100/2200 vegetated roof systems on design flexibility, plant palette, and certified installer program.
• Columbia Green Technologies: Columbia Green designs and supplies vegetative roof systems, stormwater management solutions, and green roof components to commercial projects. Direct competitor to Hanging Gardens across rooftop green infrastructure and stormwater harvesting product lines.
• Xero Flor America: Xero Flor America is a leading North American provider of pre-vegetated green roof systems and components. Directly competes with Hanging Gardens in extensive and semi-intensive vegetative roof installations, serving similar architects, contractors, and building owners in the green infrastructure market.
• Roofscapes: Roofscapes is a Wisconsin/Midwest-based green roof design, installation, and maintenance contractor. Operates in the same regional market and competes for many of the same municipal and institutional vegetation projects as Hanging Gardens.

Broad incumbents

• Sika Sarnafil: Sika is a global construction chemicals and roofing powerhouse whose Sarnafil division supplies single-ply membranes frequently specified beneath green roof assemblies. Larger and more diversified than Hanging Gardens, but addresses the same waterproofing-plus-greenery specification on commercial projects.
• Carlisle Construction Materials: Carlisle is one of North America's largest roofing and waterproofing product manufacturers, offering EPDM, TPO, and vegetative roof solutions. Overlaps with Hanging Gardens' waterproofing and green roof system offerings through its broad commercial building envelope portfolio.
• Tremco Roofing and Building Maintenance: Tremco is a major building envelope and roofing solutions provider offering waterproofing, vegetated roofing, and maintenance services as part of a much broader portfolio. Competes with Hanging Gardens on large institutional green roofing projects where Tremco can bundle roofing and green infrastructure together.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/HangingGardensL
• Facebookfacebook.com/hanginggardensllc
• LinkedInlinkedin.com/company/hanging-gardens-llc

Revenue estimate

Valuation estimate

Number of profiles

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 Hanging Gardens