Premium vinyl windows. Limited lifetime warranty. One honest number. Take your time.
The mule is stubborn about the right things. We are too.
No fake retail prices. No 50% "today only" discounts. No calling your spouse right now. We show up, measure every opening, and hand you a written quote.
Covers frame, glass, hardware, and our labor — non-prorated, transferable to the next owner, for as long as you own the home.
Every opening sealed properly. Every trim piece finished. Every warranty registered before we leave.
Premium vinyl windows built for East Tennessee. Custom-manufactured to your exact openings. Backed for life.
The classic replacement window for Knoxville homes.
Learn MoreTightest seal. Best ventilation. Contemporary look.
Learn MoreWide openings. Simple operation. Modern homes.
Learn MoreMore light. More space. More character.
Learn MoreMaximum light. Zero interruption. Stunning views.
Learn MoreBring the outside in. Smooth. Energy efficient.
Learn MoreTwenty years in sales and operations. Started Stubborn Mule to bring homeowners premium windows without the corporate games.
Read Our Story →Take your time at every step. We’re not going anywhere.
One hour at your home — that’s our cap. We measure every opening and answer your questions, then we’re out. We only stay longer if you ask us to.
Itemized. Clear. Good for 90 days. Take your time.
Every window manufactured to your exact opening dimensions. 4-6 weeks.
Full crew, typically 1-2 days for whole-house. Sealed. Trim finished.
From Knoxville to Jefferson City — and everywhere between.
Whenever you’re ready — tomorrow, next week, next month — we’re here. No pressure, no follow-up spam, no games.
The story behind the mule. Two paragraphs. Then get your windows.
I spent twenty years in sales and operations — multi-unit franchise ownership, real estate, a tech company I founded and exited, and most recently corporate home improvement. That last chapter is what pushed me to start Stubborn Mule. I watched an entire industry train salespeople to manipulate homeowners into signing tonight, and it wasn’t for me.
That wasn’t the only mistake I watched them make. From the inside I saw bad orders, unnecessary overhead, and headcount they didn’t need — all of it driving the price up, all of it charged to the homeowner. Stubborn Mule is built the opposite way: a new-age company that cares about two things — the customer, and our promise of quality at every angle. Everything else is noise. Your money goes to a local company owned by someone who lives about five miles from you. When something goes wrong, I’m the one you call.
Get a straight quote from a company that shows up when they say they will, does the work right, and stands behind it for life. No pressure, no follow-up spam, no games.
Get your free in-home quote. Written estimate, good for 90 days. No pressure. No games.
Premium vinyl windows built for East Tennessee. Custom-manufactured to your exact openings. Backed for life.
Two operable sashes. Timeless look. Fits nine out of ten East Tennessee homes without breaking the aesthetic. The de...
Learn MoreHinged on the side. Cranks open with a single hand. The best window in the category for energy efficiency and unobst...
Learn MoreHorizontal glide. Simple operation. Perfect for contemporary architecture and wider openings. A clean visual li...
Learn MoreA room-changing architectural feature. Adds interior space, catches light from three angles, and delivers instant cu...
Learn MoreFixed glass. No moving parts. The strongest energy performance in the vinyl category and an uninterrupted view of wh...
Learn MoreSmooth operation. Energy-efficient glass. Built for Tennessee weather — from Knoxville summers to lake-effect winter...
Learn MoreThat’s what the style quiz is for. Five questions, and the mule will point you to the right window for your home. 45 seconds. No forms.
Two operable sashes. Timeless look. Fits nine out of ten East Tennessee homes without breaking the aesthetic. The default replacement window for a reason.
A double-hung window has two vertically-sliding sashes — both the top and bottom can open independently. It’s the most common residential window design in America for good reason: familiar look, easy to operate, easy to clean from inside the house (both sashes tilt in), and works in almost any architectural style.
Modern vinyl double-hungs are dramatically more efficient than the wood double-hungs they replace. Multi-chamber frames, dual or triple-pane glass, and modern weatherstripping deliver measurable energy savings.
Double-hung is the right pick when you want a classic look that works with any home style, easy operation for any homeowner, and simple maintenance forever. They’re the standard for a reason — homeowners rarely regret them.
One thing to know: because both sashes slide vertically, the maximum opening is only half the window height. For maximum ventilation you might consider casement instead.
Every unit is built to your exact opening dimensions . Here’s what’s inside.
Multi-chamber fusion-welded uPVC reinforced with a K-Beam (Kevlar) core — marketed 5× stronger than steel and 700× warmer than aluminum. Won’t warp, rot, or need paint.
Double- or triple-pane Low-E with argon (krypton on premium triple). The Super Spacer warm-edge seal runs up to ~16°F warmer at the glass edge than metal spacers.
Both sashes tilt in for cleaning on the Endura-Force balance system — no lubrication, no adjustment. Invisible Tilt hardware (Elements) hides the latches for a clean sash line.
Every window is custom-built to your exact opening — premium American-made vinyl sold only through installers, never big-box. Good, better, best:
High-performance value with “practically limitless” customization. A strong, efficient everyday window that still outperforms most of what’s on the market.
The premium line — named ENERGY STAR Most Efficient 2025. K-Beam reinforcement with Kevlar and the UltraSmart triple-fin antimicrobial weatherseal.
The flagship. Industry-best 0.01 cfm air infiltration, ComfortFoam-insulated frame, Super Spacer, and the Dual-Action Invisible Tilt hardware.
Placeholder: which series we lead with as our standard offer is still being finalized — we’ll set that before launch.
A double-hung opens to about half its height — plenty for most rooms — and both sashes tilt in so you clean the outside from inside. For maximum airflow, compare casement.
Placeholder values from our published glass packages — your exact NFRC label (U-factor, SHGC, VT) is confirmed per configuration when we measure. The window carries our Limited Lifetime warranty; your installation carries ours.
Custom-built means you choose. A sample of what we offer — full menu at your in-home visit.
Double-Hung might be the right fit. It might not. Either way, we’d rather have that conversation in person than push you toward a decision on a website.
Hinged on the side. Cranks open with a single hand. The best window in the category for energy efficiency and unobstructed views. Built for the way modern homes are designed.
A casement window is hinged on one side and cranks outward like a door. That single design choice does a lot of work: because the sash presses tight against the frame when closed, the seal is the tightest of any operable vinyl window.
The result is measurable — better energy efficiency, better weather resistance, better sound insulation than double-hung or slider windows of the same size and glass package.
Casement windows are the right pick when you want maximum ventilation, minimum obstruction, or top-tier energy performance. They’re a natural fit for kitchens (crank open over the sink), bedrooms, or contemporary homes where clean lines matter.
One thing to know: because they crank outward, they take up outside space when open. If you’ve got a walkway or deck right against the window, that’s a consideration.
Every unit is built to your exact opening dimensions . Here’s what’s inside.
Same fusion-welded, K-Beam-reinforced uPVC frame as the whole line — rigid, weathertight, and finished to match.
Cranks shut against multi-point locking hooks that pull the sash into the frame on all sides. The result is the lowest air infiltration of any operating window we build.
One-hand roto crank with a folding nesting handle that sits flush behind blinds and shades. Sized to meet bedroom egress code.
Every window is custom-built to your exact opening — premium American-made vinyl sold only through installers, never big-box. Good, better, best:
High-performance value with “practically limitless” customization. A strong, efficient everyday window that still outperforms most of what’s on the market.
The premium line — named ENERGY STAR Most Efficient 2025. K-Beam reinforcement with Kevlar and the UltraSmart triple-fin antimicrobial weatherseal.
The flagship. Industry-best 0.01 cfm air infiltration, ComfortFoam-insulated frame, Super Spacer, and the Dual-Action Invisible Tilt hardware.
Placeholder: which series we lead with as our standard offer is still being finalized — we’ll set that before launch.
A casement seals like a car door and swings fully open, so it ventilates better and leaks less air than any other operating style — ideal over a kitchen sink or anywhere a crank is easier than a lift.
Placeholder values from our published glass packages — your exact NFRC label (U-factor, SHGC, VT) is confirmed per configuration when we measure. The window carries our Limited Lifetime warranty; your installation carries ours.
Custom-built means you choose. A sample of what we offer — full menu at your in-home visit.
Casement might be the right fit. It might not. Either way, we’d rather have that conversation in person than push you toward a decision on a website.
Horizontal glide. Simple operation. Perfect for contemporary architecture and wider openings. A clean visual line for mid-century and modern homes.
A slider window has one or more sashes that glide horizontally on a track. The design is common in mid-century ranch homes and contemporary architecture where the horizontal line matters more than the vertical.
Because sliders open horizontally, they fit well in wide openings that would be awkward for a double-hung or casement. And with fewer moving parts than either alternative, they tend to require less maintenance over time.
Slider windows are the right pick when you want a horizontal design language, wide openings without a center mullion, or minimal hardware maintenance. They’re a natural fit for ranches, contemporary homes, and rooms where a low horizontal line matters.
One thing to know: sliders open only half the width at a time. For maximum ventilation across a wide opening, casement or awning windows deliver more airflow per square foot.
Every unit is built to your exact opening dimensions . Here’s what’s inside.
Fusion-welded, K-Beam-reinforced uPVC on a low-profile sill built for wide, short openings.
DuraRoller stainless ball-bearing rollers carry the sash for smooth one-finger operation that keeps working for decades — no springs, no cranks.
Swing & Clean sashes tilt in for easy cleaning. Available as a 2-lite glider or a 3-lite end-vent for very wide openings.
Every window is custom-built to your exact opening — premium American-made vinyl sold only through installers, never big-box. Good, better, best:
High-performance value with “practically limitless” customization. A strong, efficient everyday window that still outperforms most of what’s on the market.
The premium line — named ENERGY STAR Most Efficient 2025. K-Beam reinforcement with Kevlar and the UltraSmart triple-fin antimicrobial weatherseal.
The flagship. Industry-best 0.01 cfm air infiltration, ComfortFoam-insulated frame, Super Spacer, and the Dual-Action Invisible Tilt hardware.
Placeholder: which series we lead with as our standard offer is still being finalized — we’ll set that before launch.
Sliders suit contemporary elevations and openings that are wider than they are tall. Nothing to crank or lift — just a clean horizontal glide.
Placeholder values from our published glass packages — your exact NFRC label (U-factor, SHGC, VT) is confirmed per configuration when we measure. The window carries our Limited Lifetime warranty; your installation carries ours.
Custom-built means you choose. A sample of what we offer — full menu at your in-home visit.
Slider might be the right fit. It might not. Either way, we’d rather have that conversation in person than push you toward a decision on a website.
A room-changing architectural feature. Adds interior space, catches light from three angles, and delivers instant curb appeal. The choice when you want a room to feel different.
A bay window projects outward from the house in three sections — typically a large picture window in the center with operable double-hungs or casements on either side. A bow window uses four or more equal-sized sections curved gently outward.
Both add interior space (usable for seating or storage), pull light from three different angles, and dramatically change how a room feels. They’re also the strongest curb-appeal upgrade in the window category.
Bay and bow windows are the right pick when you want to transform a specific room, add architectural character, or create a natural reading nook. Common in living rooms, breakfast nooks, and master bedrooms.
One thing to know: because they project out from the wall, installation is more complex than a flat replacement. Structural support, roof cap detail, and interior finish all matter. Not every opening is a candidate — we’ll tell you honestly when we measure.
Every unit is built to your exact opening dimensions . Here’s what’s inside.
A factory-assembled projection unit with insulated head and seat boards (birch veneer or laminate) and a concealed cable and knee-brace support system rated for the load.
Bay: three units at a 30° or 45° angle. Bow: four or more in a gentle curve. Operating end units (double-hung or casement) for airflow, a big fixed unit in the center for the view.
Same Low-E and triple-pane glass packages as the rest of the line, so the whole assembly performs as one.
Every window is custom-built to your exact opening — premium American-made vinyl sold only through installers, never big-box. Good, better, best:
High-performance value with “practically limitless” customization. A strong, efficient everyday window that still outperforms most of what’s on the market.
The premium line — named ENERGY STAR Most Efficient 2025. K-Beam reinforcement with Kevlar and the UltraSmart triple-fin antimicrobial weatherseal.
The flagship. Industry-best 0.01 cfm air infiltration, ComfortFoam-insulated frame, Super Spacer, and the Dual-Action Invisible Tilt hardware.
Placeholder: which series we lead with as our standard offer is still being finalized — we’ll set that before launch.
A bay or bow pushes the wall outward — adding a light-filled interior sill, capturing views from three angles, and genuinely changing how a room feels. It’s the one window that’s also a small remodel.
Placeholder values from our published glass packages — your exact NFRC label (U-factor, SHGC, VT) is confirmed per configuration when we measure. The window carries our Limited Lifetime warranty; your installation carries ours.
Custom-built means you choose. A sample of what we offer — full menu at your in-home visit.
Bay & Bow might be the right fit. It might not. Either way, we’d rather have that conversation in person than push you toward a decision on a website.
Fixed glass. No moving parts. The strongest energy performance in the vinyl category and an uninterrupted view of whatever’s outside your home.
A picture window is a fixed pane of glass — it doesn’t open. Because there are no moving parts, no operable sash, and no hardware, picture windows deliver the tightest possible seal in the vinyl category.
They’re also cheaper per square foot than operable windows, and they let you frame views without any visual interruption. Common uses: capturing a mountain view, a backyard oasis, or a large architectural focal point.
Picture windows are the right pick when you want to frame a specific view, maximize daylight, or pair with operable windows to create a larger visual expanse. Often used as the centerpiece with casements or awnings flanking for ventilation.
One thing to know: because they don’t open, picture windows offer zero ventilation. In any room that needs airflow, you’ll want at least one operable window paired alongside.
Every unit is built to your exact opening dimensions . Here’s what’s inside.
No moving parts means the tightest seal and the best thermal numbers we offer — let the picture window carry the view and let the units beside it do the venting.
Bainbridge LE slimline frames maximize glass and viewing area, so you see more window and less vinyl across a big opening.
Fusion-welded, K-Beam-reinforced uPVC with the full Low-E / triple-pane menu. Tempered safety glass where code requires it.
Every window is custom-built to your exact opening — premium American-made vinyl sold only through installers, never big-box. Good, better, best:
High-performance value with “practically limitless” customization. A strong, efficient everyday window that still outperforms most of what’s on the market.
The premium line — named ENERGY STAR Most Efficient 2025. K-Beam reinforcement with Kevlar and the UltraSmart triple-fin antimicrobial weatherseal.
The flagship. Industry-best 0.01 cfm air infiltration, ComfortFoam-insulated frame, Super Spacer, and the Dual-Action Invisible Tilt hardware.
Placeholder: which series we lead with as our standard offer is still being finalized — we’ll set that before launch.
A fixed picture window doesn’t open — which is exactly why it seals tighter and insulates better than anything that does. Flank it with double-hungs or casements for airflow.
Placeholder values from our published glass packages — your exact NFRC label (U-factor, SHGC, VT) is confirmed per configuration when we measure. The window carries our Limited Lifetime warranty; your installation carries ours.
Custom-built means you choose. A sample of what we offer — full menu at your in-home visit.
Picture might be the right fit. It might not. Either way, we’d rather have that conversation in person than push you toward a decision on a website.
Smooth operation. Energy-efficient glass. Built for Tennessee weather — from Knoxville summers to lake-effect winters.
A sliding patio door is a large glass opening that connects an interior room to an outdoor space — patio, deck, or backyard. One or both panels slide horizontally on a track.
Modern vinyl patio doors are dramatically more efficient than the aluminum doors they typically replace. Multi-point locks, dual-pane insulating glass, and modern weatherstripping deliver energy performance closer to a wall than to an old door.
Sliding patio doors are the right pick when you want to open up a room to outdoor living, maximize the visual connection to your yard, or replace a failing older door. Most common on the back of the home connecting to a deck or patio.
One thing to know: patio door installation typically involves more framing work than a standard window because you’re working with a larger opening. We’ll assess the framing when we measure and tell you honestly what the install involves.
Every unit is built to your exact opening dimensions . Here’s what’s inside.
Kingsroyal Glide sliding patio door in fusion-welded, foam-filled vinyl. Tandem stainless rollers carry the panel on a reinforced sill; available up to 8-ft heights.
A 2-point mortise lock, interlocking meeting rails, and multi-fin weatherstripping. A BetterVue high-definition fiberglass screen is included.
The same Low-E / argon (and triple-pane) glass packages as the windows, so the whole opening performs as one system. Tempered safety glass standard.
Every window is custom-built to your exact opening — premium American-made vinyl sold only through installers, never big-box. Good, better, best:
High-performance value with “practically limitless” customization. A strong, efficient everyday window that still outperforms most of what’s on the market.
The premium line — named ENERGY STAR Most Efficient 2025. K-Beam reinforcement with Kevlar and the UltraSmart triple-fin antimicrobial weatherseal.
The flagship. Industry-best 0.01 cfm air infiltration, ComfortFoam-insulated frame, Super Spacer, and the Dual-Action Invisible Tilt hardware.
Placeholder: which series we lead with as our standard offer is still being finalized — we’ll set that before launch.
A slider brings the outside in without swinging into the room, and it matches the windows in color, grid, and glass so the elevation reads as one system.
Placeholder values from our published glass packages — your exact NFRC label (U-factor, SHGC, VT) is confirmed per configuration when we measure. The window carries our Limited Lifetime warranty; your installation carries ours.
Custom-built means you choose. A sample of what we offer — full menu at your in-home visit.
Patio Doors might be the right fit. It might not. Either way, we’d rather have that conversation in person than push you toward a decision on a website.
Six cities. Same standard. Local company. Local crews. Same phone number.
From Sequoyah Hills to Fountain City, Bearden to West Hills — premium vinyl windows for the neighborhoods we know.Learn More
For the West Knoxville homes built to last — windows that match the standard....
Learn MoreFor Blount County homes — historic and new — installed by neighbors, not a call center....
Learn MoreFor the Secret City’s homes — from the original Cemestos to modern builds....
Learn MoreFor Fort Loudon Lake homes and Loudon County residents — waterfront quality installations....
Learn MoreFor Jefferson County homes — installed by a company that actually shows up....
Learn MoreIf you’re anywhere within about a 45-minute drive of Knoxville, we probably serve you. Give us a call and we’ll tell you honestly.
From Sequoyah Hills to Fountain City, Bearden to West Hills — premium vinyl windows for the neighborhoods we know.
Knoxville is a city of neighborhoods with real character. From 1920s bungalows in Old North Knoxville to mid-century ranches in West Hills, from sprawling colonials in Sequoyah Hills to newer builds in Farragut — most Knoxville homes are past the useful life of their original windows.
Our crews live here. This isn’t a franchise or a corporate branch office — this is a Knoxville company serving Knoxville homeowners.
Most Knoxville homes we work on are 20-40+ years old. The original single-pane or early double-pane windows have failed seals, drafty frames, and rising energy bills to show for it. Our typical Knoxville project is a whole-house install of 10-15 double-hung vinyl windows.
Get a straight quote from a company that lives about thirty minutes from your front door. Written estimate good for 90 days. No pressure. No games.
For the West Knoxville homes built to last — windows that match the standard.
Farragut’s a town of newer builds, quality schools, and homeowners who care about their properties. Most Farragut homes were built in the 1980s and 1990s — which means the original windows are 30-40 years old and ready for their first replacement.
We work through Farragut neighborhoods every week. Village Green, Concord, Fox Den — we know the housing stock, the HOA nuances, and what looks right on West Knoxville homes.
Whole-house replacements are typical here — homeowners investing in the long-term value of larger properties. Double-hung and casement combinations are common on Farragut colonials and transitional-style homes.
Get a straight quote from a company that lives about thirty minutes from your front door. Written estimate good for 90 days. No pressure. No games.
For Blount County homes — historic and new — installed by neighbors, not a call center.
Maryville’s a mix. Historic downtown craftsman homes with original wood windows past their useful life. Newer developments along Alcoa Highway with builder-grade windows that never performed well. Both need real replacement — not cheap upgrades.
We know the difference between preserving character on a historic home and modernizing efficiency on a 90s ranch. Different jobs. Same standard.
Historic homes need windows that respect the architecture — often double-hung with grille patterns matching the original. Newer homes typically want efficiency upgrades. We do both without compromising either.
Get a straight quote from a company that lives about thirty minutes from your front door. Written estimate good for 90 days. No pressure. No games.
For the Secret City’s homes — from the original Cemestos to modern builds.
Oak Ridge is a unique housing market. The original alphabet houses (A, B, C, D, E, F, K) from the Manhattan Project era have distinctive window configurations that need careful matching. Newer developments in West Hills and beyond need modern efficiency.
We understand both. Oak Ridge homeowners often care about historical character and energy bills. We can deliver both without compromise.
Historic alphabet houses often need custom-sized replacements to match original openings — we can source these. Modern homes typically benefit from full-house double-hung or casement replacements for immediate energy savings.
Get a straight quote from a company that lives about thirty minutes from your front door. Written estimate good for 90 days. No pressure. No games.
For Fort Loudon Lake homes and Loudon County residents — waterfront quality installations.
Lenoir City’s growing fast. New developments along Fort Loudon Lake, waterfront properties needing serious weather protection, older homes in the historic downtown. All benefit from the same standard: premium vinyl, done right, warrantied for life.
Lakefront homes see brutal weather cycles. Sun, humidity, wind off the water. The windows have to hold up. We install for the environment they’ll live in.
Waterfront installations get our attention on hardware — stainless steel across the board. Newer developments often benefit from casement upgrades for tighter seals against lake weather.
Get a straight quote from a company that lives about thirty minutes from your front door. Written estimate good for 90 days. No pressure. No games.
For Jefferson County homes — installed by a company that actually shows up.
Jefferson City’s a smaller market with older housing stock and strong community. The homes here have been maintained for generations — often waiting for the right time for a full window replacement.
We’re not a Knoxville company that says they serve Jefferson City. We’re a Knoxville company that actually shows up. Same crews, same standards, same phone number.
Older brick homes typically need traditional double-hung replacements with authentic grille patterns. Newer builds often benefit from efficiency upgrades to reduce heating costs.
Get a straight quote from a company that lives about thirty minutes from your front door. Written estimate good for 90 days. No pressure. No games.
Same-as-cash promotional plans. Reduced-rate long-term financing. Or just pay cash. We don’t push financing.
Every window company has a financing pitch. Ours is short: use it if it helps you, skip it if it doesn’t.
We don’t get paid more if you finance. We don’t get paid less if you pay cash. Our prices are the same either way.
Something most companies won’t tell you: we pay a dealer fee to the finance company on every financed project. That fee is built into our prices already. Same price whether you finance or pay cash.
No. Same price whether you finance or write us a check.
Not with the plans we offer. Pay off any loan early without penalty.
We’ll tell you honestly and move on. Nobody gets pressured, nobody gets ghosted.
We’ll give you an exact project quote — good for 90 days — and walk through the options. No pressure to finance. No pressure to sign.
Non-prorated. Transferable. Covers frame, glass, hardware, and our labor. Not just the good parts — the whole thing.
Most window companies use the word "lifetime" and hope you don’t ask what it means. Here’s what it means at Stubborn Mule:
For as long as you own the home, your windows are covered. If you sell, the warranty transfers to the next owner. No re-registration fee. No lapse.
Non-prorated means we don’t reduce coverage over time. A twenty-year-old failed seal gets the same treatment as a two-year-old failed seal.
We publish the exact coverage on this page — no fine print, no PDF download.
You call the number on the truck. Or the contract. Or this website. All go to the same place. We schedule a service visit within a week — usually within 48 hours in Knoxville. No claim forms. No proof-of-purchase to dig up.
Take our warranty to any other window company and ask them to match it — in writing, non-prorated, transferable, covering labor. Most won’t.
How a Stubborn Mule project actually goes. From first call to lifetime warranty.
We’re not going anywhere.
One hour at your home — that’s our cap. We measure every opening and answer your questions, then we’re out. No sales pressure, no "manager approval" theater, no three-hour living-room presentation. We stay longer only if you want us to.
Itemized. Clear. Good for 90 days. Take your time. Get other quotes. We’ll still be here.
Every window manufactured to your exact opening dimensions. 4-6 weeks.
Full crew, typically 1-2 days for whole-house. Sealed. Trim finished. Warranty registered.
Most window companies use the visit as a sales presentation. Two to three hours in your living room, escalating discount tiers, "manager approval" theater, pressure to sign tonight.
We don’t do any of that. Our visit is a measurement and a conversation. We get you a written quote. We leave. If you want to hire us, you tell us — days or weeks or months later. The price on the quote is the price. It doesn’t move.
Get a straight quote from a company that shows up when they say they will, does the work right, and stands behind it for life. No pressure, no follow-up spam, no games.