H Window Company
H Window Company is a US-based custom manufacturer of architectural-grade aluminum-wood composite windows, doors, and timber curtain-wall systems, serving architects, building owners, and dealers across the Upper-Midwest and major US cities through project-quoted sales and a direct Design Assist team.
- Company typePrivate
- Founded1987
- HeadquartersAshland, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What H Window Company does
H Window Company is a US-based, privately-held manufacturer of custom architectural-grade windows, doors, and timber curtain wall systems, founded in 1987 and headquartered in Ashland, Wisconsin. The company's core technology is an aluminum-wood composite construction combining extruded aluminum exteriors (available in powder coat, anodized, or Kynar fluoropolymer finishes) with kiln-dried, preservative-treated wood interiors drawn from FSC-certified species. Its signature proprietary element is the H Hinge, a reversible projecting hinge mechanism invented in Norway in 1959 by Harald Kvasnes, which allows casement and awning sashes to rotate a full 180 degrees for cleaning, supports windows up to 25 square feet and 250 lbs, and has been cycle-tested to 70,000 operations with a 0.0006% factory complaint rate across more than 45 million units sold worldwide. The product portfolio also extends into a Timber Curtain Wall system with a Total Unit U-Factor of 0.16 and laminated bamboo materials integrated through the 2026 acquisition of Lamboo Technologies.
The company serves architects and building owners across the United States, with named projects spanning high-end residential (e.g., Bayside Residence with 42-foot-wide Euro Lift and Slide doors), hospitality/wellness (Wild Rice Retreat Center), and education/commercial institutions (Rock Ridge High School, featuring 280,000 SF of Timber Curtain Wall). Go-to-market is hybrid: a trained authorized dealer network executes residential and commercial projects across the Upper-Midwest and major US cities, while a direct in-house Design Assist team of licensed architects and engineers (Kjell Hatlehol, Brice Aarrestad AIA, Jon Piff) provides spec-in services including structural sizing, thermal analysis, and constructability review. Marketing channels emphasize AIA-approved continuing education courses and project galleries to drive specification.
Revenue is generated primarily through custom one-off sales of windows, doors, and curtain-wall assemblies with project-specific pricing (quote-based, no public list prices), augmented by design-assist/technical services that effectively function as a sales-support layer. The company is privately held (President Greg Martinsen), has 11-50 employees per firmographic data, and has completed two material acquisitions in the past two years: the 123,000-square-foot Larson-Juhl Ashland facility in April 2024 (capacity expansion, with all 15 incumbent employees transitioning in) and Lamboo Technologies LLC in February 2026 (renewable-materials vertical integration). Both subsidiaries, MTTM Corporation and Lamboo, are wholly owned and operated within the H Window headquarters.
H Window Company firmographics
Firmographics- Name
- H Window Company
- Legal name
- H Window Company
- Website
- https://hwindow.com
- Company type
- Private
- Founded year
- 1987
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- H Window Company is a US-based custom manufacturer of architectural-grade aluminum-wood composite windows, doors, and timber curtain-wall systems, serving architects, building owners, and dealers across the Upper-Midwest and major US cities through project-quoted sales and a direct Design Assist team.
- Ownership category
- akta.pro rank
H Window Company industry classification
Industry- Product category
- Architectural Windows and Doors Manufacturing
- NAICS
- Wood Window and Door Manufacturing (321911), Metal Window and Door Manufacturing (332321), Custom Architectural Woodwork and Millwork Manufacturing (337212)
- SIC
- Prefabricated Wood Bldgs & Components (2452), Metal Doors, Sash, Frames, Moldings & Trim (3442)
- akta.pro primary industry
- Windows (IMADAIAC)
- akta.pro secondary industries
- Interior Doors (IMADAIAB), Custom Window & Door Fabrication & Replacement (HSAPAJAI), Mass Timber & Structural Engineered Wood (CLT, Glulam, NLT/DLT) (IMADADAC)
Keywords
Where H Window Company is headquartered
LocationHeadquarters
- HQ city
- Ashland
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
H Window Company business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Supply Chain, Infrastructure, Marketing or Sales, Technology or R&D
Revenue model
- Architectural Windows and Doors: H Window generates revenue primarily through the sale of custom architectural-grade windows and doors including awning windows, casement windows, tilt-turn windows, direct-set windows, Nordic outswing doors, and Euro lift and slide doors. Products are custom-manufactured for each project based on architect specifications with pricing provided via quote requests. The company also offers the Timber Curtain Wall system for commercial and large residential projects.
- Design Assist and Technical Services: H Window provides design assist services including system consulting, detailing and specification review, constructability review, structural sizing and anchoring design, thermal analysis, and budget pricing and value engineering. These services support the sales process and help architects and building owners specify H Window products for their projects.
- Continuing Education Programs: H Window offers AIA Approved continuing education courses for architects including Introduction to Composite Aluminum-Wood Windows, Introduction to Timber Curtain Walls, Integrated Facade Design, and Regenerative Facades. These courses help build relationships with the architectural community and position H Window as a knowledge partner in glazing system design.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom Architectural Products - Quote Based |
Go-to-market motion3 records
Distribution channels3 records
Marketing channels9 records
H Window Company product offering
Product offeringCore offering
H Window Company designs, engineers, and custom-manufactures architectural-grade aluminum-wood composite windows, doors, and timber curtain wall systems for commercial and high-end residential projects. Its signature products — The H Awning, Casement, Tilt-Turn, Direct-Set windows, Nordic Outswing Door, Euro Lift & Slide Door, and Timber Curtain Wall — are built to architect specifications and supplied through an authorized dealer network across the United States. The company complements its products with a Design Assist technical service and AIA-approved continuing education courses for architects.
Product overview
H Window Company is a manufacturer of architectural-grade aluminum-wood composite windows and doors, founded in 1987 in Monticello, MN and now headquartered in Ashland, WI. The company's product portfolio centers on The H Awning Window (featuring the original 1959 Norwegian H Hinge design), The H Casement Window, The H Tilt-Turn Window, Direct-Set Windows, Nordic Outswing Door, and Euro Lift & Slide Door—all built with proprietary aluminum-wood composite construction. The company also offers the Timber Curtain Wall system for large glass façades. Following the 2026 acquisition of Lamboo Technologies LLC and the 2024 acquisition of Larson Juhl's Ashland facility, H Window has expanded into laminated bamboo materials (Lamboo brand) and increased manufacturing capacity. The products integrate sustainable materials including FSC-certified woods, bamboo, and recycled aluminum content.
Differentiator
Problem solved
Functional benefit
Brands
- Lamboo: Brand within H Window family focusing on interior and exterior architectural products including structural components, cladding, and specialty bamboo solutions.
Products and services
- The H Awning Window Projected awning window with the proprietary H Hinge allowing full 180-degree sash rotation for easy cleaning and maintenance. Aluminum-wood composite construction supports windows up to 25 square feet and 250 lbs. Designed for architects and building owners specifying high-performance residential or light commercial projects.
- The H Casement Window Projected casement window with a sliding hinge design allowing full 180-degree rotation for easy cleaning. Aluminum-wood composite construction supports double and triple pane windows up to 15 square feet for residential and commercial applications.
- The H Tilt-Turn Window Dual-action window combining European-style in-swing casement and tilt-in hopper functionality. Aluminum-wood composite frame provides natural ventilation and high thermal performance for residential and commercial projects.
- Direct-Set Windows Fixed or operable windows with aluminum-wood composite construction providing strength for large-format views. Offers custom shapes, wood species, finishes, and specialty glass combinations for architects specifying expansive or uniquely shaped glazing.
- Nordic Outswing Door Aluminum-wood composite outswing door maximizing views with high thermal efficiency. Outward-swinging design saves interior floor space and provides a superior weather seal, targeted at residential and commercial openings.
- Euro Lift & Slide Door Heavy-duty lift and slide door with aluminum-wood composite construction enabling medium to jumbo-sized openings. Designed to connect interior and exterior spaces with superior performance and natural wood beauty for luxury residential and commercial projects.
- Timber Curtain Wall Curtain wall system crafted from high-quality engineered timber or bamboo. Provides expansive glass facades with Total Unit U-Factor of 0.16, air infiltration under 0.06 cfm/ft² at 6.24 psf, and timber's high insulative properties with low embodied carbon. Targeted at commercial and large residential projects such as schools, offices, and public buildings.
- Lamboo Laminated Bamboo Materials Laminated bamboo building materials (mullions, structural components, cladding, and specialty bamboo solutions) for architectural applications. A rapidly renewable, low-carbon alternative to traditional wood with comparable structural strength, durability, and warm natural aesthetics. Offered to architects and building owners specifying sustainable building products.
Quantifiable outcome
- U-Factor of 0.16 for Timber Curtain Wall (total unit)
- +4 more outcomes
Companies that use H Window Company
Customer profileNamed customers3 records
Segments3 records
Ideal customer profiles3 records
H Window Company technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
H Window Company partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Lamboo Technologies LLCcoreH Window acquired Lamboo Technologies LLC, a long-time partner and leading innovator in laminated bamboo building materials. For more than a decade, Lamboo had supplied H Window with laminated bamboo materials used across H Window's windows, doors, and timber curtain wall systems. Lamboo also offered window products manufactured by H Window under its own brand name, Lamboo Vue. As part of the transition, Lamboo's manufacturing operations relocated from Litchfield, Illinois to H Window's headquarters in Ashland, Wisconsin. The Lamboo Vue brand will be sunset, with all fenestration products aligning under the H Window name. Lamboo will continue operating as a brand within H Window focusing on interior and exterior architectural products.
Scale indicators5 records
Recent moves6 records
Expansion highlights6 records
H Window Company competitors and assessment
Company assessmentBroad incumbents
- Andersen Corporation: Largest US window and door manufacturer with E-Series and Architectural Collection lines competing in the premium custom segment. Comparable to H Window's high-end composite and clad-wood window offerings, but with substantially broader product portfolio and dealer reach.
- Marvin Windows and Doors: One of the largest premium window and door manufacturers in North America, offering wood, aluminum-clad wood, and composite lines including the Signature Ultimate line. Directly comparable to H Window in the high-end custom residential and architectural specification market, but with vastly greater scale, dealer network, and product breadth.
- Pella Corporation: One of the largest US window and door manufacturers with broad product lines including premium wood and aluminum-clad offerings (Pella Reserve, Pella Architect Series). Overlaps with H Window in the architectural specification market but serves a much wider price and product range through a national dealer network.
- JELD-WEN: Global building products manufacturer with wood, clad-wood, and aluminum window lines including premium IWP and Pozzi brands. Overlaps with H Window in custom wood window manufacturing but serves a much broader market through mass and premium channels.
Direct peers
- Loewen Windows and Doors: Canadian-based manufacturer of high-end wood and aluminum-clad windows and doors targeting luxury residential and architectural projects. Comparable in custom fabrication, premium pricing, and architect-driven specification sales, with similar tilt-turn, lift-and-slide, and large-format capabilities.
- Kolbe Windows & Doors: Premium custom manufacturer of wood, aluminum-clad wood, and all-aluminum windows and doors serving architects and luxury residential customers. Highly comparable to H Window in product positioning, custom-engineered approach, and architectural specification focus, with overlapping awning, casement, tilt-turn, and lift-and-slide offerings.
- Western Window Systems: Manufacturer of large-format aluminum and aluminum-wood composite sliding doors, pivot doors, and windows for high-end residential and commercial projects. Comparable to H Window's Euro Lift & Slide door and Direct-Set window offerings in serving architects seeking expansive glazing and contemporary aesthetics.
- Wasco Products: Manufacturer of custom architectural windows, curtain walls, and skylights serving commercial and high-end residential projects. Comparable to H Window's Timber Curtain Wall and commercial glazing offerings, with similar custom engineering, thermal performance emphasis, and architect-specification go-to-market.
Regional players
- Quantum Windows & Doors: Canadian manufacturer of vinyl and aluminum windows serving residential and light commercial markets with thermal performance focus. Loosely comparable as a regional custom window manufacturer but operates in a more mass-market segment than H Window's premium architectural focus.
Emerging players
- Vitrocsa: Swiss-origin minimalist framing window and sliding door manufacturer targeting ultra-premium architectural projects with extremely slim profiles. Comparable to H Window's positioning in the high-end architect specification market, particularly for expansive glazing, but with a differentiated minimal-frame aesthetic.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
H Window Company social profiles
Digital presenceH Window Company compliance and trust
Trust signalCompliance1 record
H Window Company financial estimates
Financial estimateRevenue estimate
Valuation estimate
H Window Company leadership team
Management profileNumber of profiles
Profiles4 records
H Window Company subsidiaries and ownership
Company hierarchySubsidiaries2 records
H Window Company funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
H Window Company M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about H Window Company
What does H Window Company do?
H Window Company designs, engineers, and custom-manufactures architectural-grade aluminum-wood composite windows, doors, and timber curtain wall systems for commercial and high-end residential projects. Its signature products — The H Awning, Casement, Tilt-Turn, Direct-Set windows, Nordic Outswing Door, Euro Lift & Slide Door, and Timber Curtain Wall — are built to architect specifications and supplied through an authorized dealer network across the United States. The company complements its products with a Design Assist technical service and AIA-approved continuing education courses for architects.
Is H Window Company a public or private company?
H Window Company is a private company. It is classified as management employee owned and is currently operating.
When was H Window Company founded?
H Window Company was founded in 1987. It employs 11 to 50 people.
Where is H Window Company based?
H Window Company is headquartered in Ashland, United States, in the North America region.
How does H Window Company make money?
Three revenue lines are on record. Architectural Windows and Doors are the primary driver. The others are design Assist and Technical Services and continuing Education Programs.
Who are H Window Company's main competitors?
Broad incumbents on record are Andersen Corporation, Marvin Windows and Doors, Pella Corporation and JELD-WEN. Direct peers are Loewen Windows and Doors, Kolbe Windows & Doors, Western Window Systems and Wasco Products. Quantum Windows & Doors is listed as a regional player. Vitrocsa is listed as an emerging player.
Does H Window Company have an API?
No public API is recorded for H Window Company.
What industry is H Window Company in?
H Window Company's product category is Architectural Windows and Doors Manufacturing. Its primary akta.pro industry code is IMADAIAC, Windows, with a secondary code of IMADAIAB, Interior Doors. Its NAICS code is 321911 and its SIC code is 2452.