Business Details
50+ Years
experience
Your Trusted Exterior Contractor in Duluth, MN
Les Grumdahl Window & Siding has been a trusted name in exterior home improvement since 1947. Founded by Ivar Grumdahl and rebranded in 1994 by Les Grumdahl, our family-owned business now enters its third generation of service excellence. We specialize in certified installation of windows, siding, roofing, decks, and more, with most products backed by limited lifetime warranties. Our Duluth, MN showroom serves residential and commercial clients across Northland, offering top brands and a commitment to meeting or beating qualified written estimates. With a dedicated installation crew and a new 2021 facility, we combine decades of expertise with modern resources to deliver quality solutions tailored to each customer's needs. 
Services
Windows
Siding
Roofing
Metal Roofing
Gutters
Doors
Awnings
Decks
Additions
Boral Stone
Details
- Year established: 1947
Highlights and features
- 75+ years of local exterior improvement expertise
- Certified installation teams for quality assurance
- Limited lifetime warranties on most products
- Family-owned commitment to personalized service
- Free estimates and price-matching guarantee
Associations and certifications
- GAF
What people say
Fantastic job
No complaints
Thrilled with windows
Professional crews
Beautifu exterior results
Services
Windows
We offer premium window replacement solutions with energy-efficient options that enhance home comfort and aesthetics. Our certified installers work with top brands to ensure proper fit and performance. Limited lifetime warranties protect your investment while improving insulation and curb appeal.
Siding
Our siding solutions combine durability with visual appeal using high-quality materials that withstand Minnesota's climate. Certified crews install siding that enhances energy efficiency and property value. Limited lifetime warranties cover materials and workmanship for long-term protection.
Roofing
As GAF Certified contractors, we provide premium roofing systems with superior weather protection. Our metal roofing options offer longevity and energy efficiency. Certified installations come with comprehensive warranties, ensuring peace of mind for residential and commercial properties.
Gutters
We install durable gutter systems that protect foundations from water damage. Professional crews ensure proper drainage and seamless integration with existing structures. Our solutions combine functionality with aesthetic appeal to complement your home's exterior.
Decks
Custom deck construction transforms outdoor spaces with durable, low-maintenance materials. Our experts design and build functional entertainment areas that enhance property value. Certified installations ensure structural integrity and long-lasting performance.
People
Les Grumdahl
Owner
Third-generation exterior specialist with decades of hands-on experience overseeing installations and customer satisfaction. Continues family legacy started in 1947 through quality craftsmanship and personalized service.
Ryan Grumdahl
Partner
Joined family business in 1995, bringing modern expertise to traditional values. Manages operations while maintaining commitment to certified installations and customer care.
Rick Wallin
Sales Representative
Experienced team member providing expert guidance on product selection and solutions since joining the company. Combines technical knowledge with personalized service approach.
Tim Herstad
Sales Representative
New team addition with industry expertise, offering personalized assistance for exterior improvement projects. Brings fresh perspective while upholding company standards established over 75 years.
Questions
What exterior services do you offer?
We provide windows, siding, roofing, gutters, decks, awnings, and doors with certified installation and limited lifetime warranties.
Are your installers certified professionals?
Yes, we employ certified installation crews for all major services, ensuring quality workmanship and warranty compliance.
Do you offer warranties on your work?
Most products include limited lifetime warranties covering materials and professional installation workmanship.
Can you match competitors' pricing?
We'll meet or beat any qualified written estimate from local competitors while maintaining our quality standards.
Do you serve commercial properties?
Yes, we provide exterior solutions for both residential and commercial buildings across Northland.
Where is your showroom located?
Our Duluth, MN showroom at 2801 W Michigan St showcases our product selections for local customers.
