Why Choose Duncan's?

Let us explain what our customers have said they loved.

Learn more

In-House Installers — Never Subcontracted


Why This Matters


Consistent Quality

Our installers work under the same standards, training, and leadership every day. That means every project meets the Duncan’s level of precision — no surprises, no inconsistencies.


Full Accountability

Because we never bring in subcontractors, you always know exactly who is in your home. Our team members carry Duncan’s reputation on their shoulders, and they take that responsibility seriously.


Respect for Your Home

Our installers treat your home like their own — protecting floors, cleaning up thoroughly, and minimizing disruption. Subcontracted crews often juggle multiple companies; our team is focused solely on you.


Better Communication

You deal with the same team from start to finish. No runaround, no confusion, no “let me check with another crew.” Clear communication = a smoother, stress-free installation.


Trained to Duncan’s Standards

Every installer goes through ongoing training for Wisconsin weather performance, energy-efficiency best practices, and the latest installation methods.

No Pressure.

No Gimmicks.

No Sales Tricks.

At Duncan’s, we believe homeowners deserve honest answers — not overly long sales appointments, fake “today only” discounts, or scare tactics built to close a deal. Our approach is simple: we educate, you decide.



What This Means for You

  • Respect for Your Time
    We keep appointments efficient, focused, and free from drawn-out sales pitches.
  • Honest, Upfront Pricing
    No games. No “let me call my manager.” No discounts that mysteriously expire at midnight.
  • Education Over Persuasion
    We take the time to explain products, options, features, and installation methods so you can make a confident decision.
  • Your Pace, Your Choice
    We don’t push. We don’t pressure. We simply give you the information — you choose when you’re ready.


Designed for Wisconsin Weather


Wisconsin weather is no joke — freezing winters, humid summers, heavy storms, and sudden temperature swings. Duncan’s windows and doors are engineered specifically to handle the extreme Midwest climate year after year.



Why That Matters

  • Winter-Proof Performance
    Our windows fight drafts, stop cold air infiltration, and maintain stable indoor temperatures.
  • Built for Humidity & Heat
    Materials are chosen to resist swelling, warping, and moisture damage.
  • Storm-Ready Construction
    Reinforced frames, strong seals, and durable glass stand up to severe winds and rain.
  • Seasonal Consistency
    You get reliable comfort and energy efficiency no matter what Wisconsin throws your way.


Energy Efficiency That Pays You Back

The right window isn’t just a home upgrade — it’s a long-term investment. Duncan’s products are selected for high efficiency, durability, and performance, helping you save money year after year.

Energy Benefits You’ll Notice

  • Lower Energy Bills
    Better insulation means your heating and cooling systems don’t work as hard.
  • Reduced Drafts & Hot/Cold Spots
    Your home stays consistently comfortable from room to room.
  • Better Indoor Temperature Control
    Engineered glass and frame technology help stabilize interior temperatures.
  • Long-Term Savings
    Efficient windows and doors reduce wear on HVAC systems, often paying for themselves over time.


A Style for Every Home


Your home deserves windows and doors that match its character — whether classic, contemporary, farmhouse, or somewhere in between. Duncan’s offers a wide range of options so you never have to compromise on aesthetics.


Options Homeowners Love



  • Multiple Frame Styles & Profiles
    Clean modern lines or traditional detailed frames — your choice.
  • Custom Colors & Finishes
    From bold exteriors to subtle interior woodgrains, we match your home’s personality.
  • Glass Options for Privacy, Style & Efficiency
    Choose from decorative glass, tinted glass, energy-efficient coatings, and more.
  • Hardware That Completes the Look
    Stylish handles, locks, and hinges designed to complement your home’s design.
  • Professional Design Guidance
    Our team helps you choose the perfect combination for beauty, comfort, and value.


No Finger-Pointing Warranty Service — Ever.

This is where we stand above the rest.

Many companies outsource installations to subcontractors and then tell customers:
“Sorry, call the manufacturer,”
or
“Call the subcontractor — they installed it.”


Not here.


When you choose Duncan’s Window & Door:

  • We buy direct.
  • We install with our own in-house employees.
  • We handle both product and labor warranties.


That means the only finger you’ll ever need to point… is at us.
And we’re proud of that.



If an issue ever comes up—whether product or installation—we’ll be here to take care of you. No runaround. No excuses. No blame game.

This is the Duncan’s Difference.


How the Process Works


1. Free, No-Pressure Consultation

We measure, we educate, we quote—no pressure to buy.


2. Product Selection

We help you choose the best window for your home, style, and budget.


3. Installed by In-House Craftsmen

Respectful, trained professionals who work for us—not a revolving door of subcontractors.



4. Warranty Support You Can Count On

If you ever need us, we’ll be there—because we installed it, we service it, and we stand behind it.


Contact Us

We can help you today, drop us a line and let's talk about what you would like to accomplish.