MI Windows and Doors

What MI Windows and Doors does

MI Windows and Doors, founded in 1947 and headquartered in Gratz, Pennsylvania with corporate offices in Harrisburg, is a manufacturer of vinyl, aluminum, and fiberglass windows and sliding patio doors. The company operates three consolidated brands — MI Windows and Doors, Milgard Windows & Doors (acquired from Masco in November 2019), and Sunrise Windows & Doors (acquired in December 2020) — under the MITER Brands holding company, which was rebranded in April 2022. Manufacturing is conducted at more than 10 plants across the United States, and products are sold exclusively through a network of 549+ authorized dealers in roughly 20+ states, with additional private-label/OEM manufacturing for partners including Window World.

The product portfolio spans entry-level to premium vinyl window series (V2000, V3000, V4500, V5500 Restorations), aluminum patio doors (A2000), hurricane impact windows and doors tested to ASTM standards, Low-E energy-efficient glass, and window opening control devices. MI holds ENERGY STAR Most Efficient certification (IRS Qualified Manufacturer code W2Q8) and VPP Star workplace safety certifications at its Gratz, PA and Prescott Valley, AZ facilities. Core technologies center on precision fenestration engineering and NFRC-verified thermal performance rather than software or AI capabilities.

The business model is B2B2C: MI manufactures windows and doors, prices them on a quote-based per-unit basis through authorized dealers, and captures revenue from three customer segments — replacement-market homeowners, builders/remodelers for new construction, and private-label/OEM partners. Per-unit pricing ranges from roughly $500–$700 for standard impact windows to $2,000–$7,000 for impact-rated sliding glass doors. The company is privately held, completed a $400 million senior notes offering in January 2022, and supports its brands through the MITER Foundation charitable arm.

Name

MI Windows and Doors

Legal name

MI Windows and Doors, LLC

Website

https://miwindows.com

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

101–250 employees

Short description

MI Windows and Doors is a U.S. manufacturer of vinyl, aluminum, and fiberglass windows and sliding patio doors, operating under MITER Brands alongside Milgard and Sunrise. It serves replacement homeowners, builders, and private-label partners through 10+ plants and 549+ authorized dealers nationwide.

Ownership category

akta.pro rank

Product category

Windows and Doors Manufacturing

NAICS

Metal Window and Door Manufacturing (332321), Glass and Glass Product Manufacturing (32721)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442), Glass Products, Made Of Purchased Glass (3231)

akta.pro primary industry

Windows (IMADAIAC)

akta.pro secondary industries

Exterior Doors (IMADAIAA), Window Replacement (Residential) (HSAPAJAA), Doors, Windows & Millwork Retail (Interior/Exterior Doors, Windows, Moulding) (CRAIAEAI)

Keywords

• Vinyl windows
• Fiberglass windows
• Aluminum windows
• Patio doors
• Replacement windows

Headquarters

HQ city

Gratz

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Revenue model

1. Window and Door Manufacturing Sales: MI Windows and Doors generates revenue through the manufacture and sale of vinyl, aluminum, and fiberglass windows and sliding patio doors. Products are sold through an authorized dealer network to homeowners, builders, remodelers, and contractors for both new construction and replacement applications. Pricing varies by product series and specifications, with windows ranging from approximately $500-$700 and sliding doors from $2,000-$7,000.
2. Private Label/OEM Manufacturing: MI manufactures windows and doors for private label partners including Window World. The company produces Window World 4000 Series and 8000 Series sliding glass doors under the MI Windows brand label.
3. Aftermarket Services: Revenue generated from warranty claims processing, replacement parts, and service requests for existing customers. The company offers replacement parts and warranty service through service request forms.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels7 records

Core offering

MI Windows and Doors manufactures vinyl, aluminum, and fiberglass windows and patio doors for residential and light-commercial applications. The company serves replacement, new construction, and remodeling demand through independent dealers, builders, remodelers, and private-label partners.

Product overview

MI Windows and Doors is a fenestration products manufacturer offering a portfolio of vinyl and aluminum windows and patio doors under three brands: MI Windows and Doors, Milgard Windows & Doors, and Sunrise Windows & Doors. The MI brand offers three vinyl window series (V4500, V3000, V2000) and aluminum patio doors (A2000), with various operating styles including double-hung, single-hung, picture, horizontal slider, casement, awning, and specialty windows. The product line also includes sliding patio doors, pocket glass walls, and stacking glass walls. Products serve both new construction and replacement applications, with specialized hurricane impact windows for coastal regions.

Differentiator

Problem solved

Functional benefit

Brands

• MI Windows and Doors: Primary brand for vinyl, aluminum, and fiberglass windows and sliding patio doors for both new construction and replacement applications.
• Milgard Windows and Doors
• Sunrise Windows and Doors

Products and services

• Vinyl Windows
• Aluminum Windows
• Fiberglass Windows
• Patio Doors

Quantifiable outcome

• Products meeting ENERGY STAR Most Efficient qualify for federal energy tax credits (30% of cost up to $600 max for windows, up to $250 per door/$500 total for doors)
• +1 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature5 records

Partnerships

Seven partnerships are on record, tiered core and major.

• Brian and Mika KleinschmidtcoreGTM or Marketing Partner · 10 March 2026MITER Brands renewed its ambassador partnership with celebrity designers Brian and Mika Kleinschmidt for a third year, expanding to include MI Windows and Doors alongside PGT Windows and Doors and the MITER Foundation. The Kleinschmidts, known for HGTV shows including 100 Day Dream Home and Rock the Block, will have access to the full suite of PGT and MI window and door products for approximately 50 projects annually in the Tampa Bay area. Partnership includes in-person trade show appearances, social media collaboration, and guest blogs.
• Penn State AthleticscoreGTM or Marketing Partner · 11 February 2026MI Windows and Doors and MITER Foundation partnered with Penn State Athletics to support THON 2026 pediatric cancer fundraising event. 18 student-athletes from football, wrestling, volleyball, and baseball teams will mobilize community outreach. MITER Foundation will match up to $50,000 in donations to the collective fundraising page through February 22, 2026. THON is the world's largest student-run philanthropy having raised more than $254 million for Four Diamonds at Penn State Health since 1977.
• MITER FoundationcoreStrategic or Co-development Partner · 11 February 2026The MITER Foundation is the charitable arm of MITER Brands, encompassing MI Windows and Doors, Milgard Windows & Doors, and Sunrise Windows & Doors. Foundation supports veterans' affairs, children's wellbeing, cancer support, and local community outreach. Raised record $2.3 million at 2022 annual golf outings and committed $1 million to Penn State's Four Diamonds childhood cancer initiative.
• Window WorldmajorOEM/ Whitelabel/ Licensing PartnerMI Windows and Doors manufactures private-label sliding glass doors for Window World, including Window World 4000 Series (DP50 upgrade only) and 8000 Series products. Products are sold through Window World's independent distributors and installers in U.S. eastern and southern coastal regions from April 2018 through March 2023 at price points between $2,000 and $7,000.
• Four Diamonds (Penn State Health)coreGTM or Marketing PartnerFour Diamonds is Penn State Health's pediatric cancer support initiative. MI Charitable Foundation has partnered with Four Diamonds since 2017, raising $33,300 in 2021-22 academic year and committing $1 million total to help conquer childhood cancer.
• Masco CorporationmajorOthersMI Windows and Doors completed acquisition of Milgard Windows & Doors from Masco Corporation in November 2019, combining two leading brands in the residential window industry and positioning MI to become the most well-known window business in America.
• Sunrise Windows & DoorsmajorOthersMI Windows and Doors acquired Sunrise Windows & Doors, a Temperance, Michigan-based vinyl replacement window manufacturer, in December 2020, expanding the company's brand portfolio and manufacturing capabilities.

Scale indicators7 records

Recent moves7 records

Expansion highlights5 records

Market position

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/mi-windows-and-doors

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries2 records

Funding overview

Funding rounds

Investors

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

M&A1 record

Investments

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

Frequently asked questions about MI Windows and Doors