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Frequently Asked Questions - Windows

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How do I identify a thermal stress crack?

Thermal stress cracks are often identifiable because they begin at the edge of the glass and extend inward at a perpendicular angle. According to Pella customer support representative Faye Howard, the crack will typically run straight from the glass edge for about a half-inch before it may begin to spider in other directions. In some cases, cladding or trim may make the edge of the glass difficult to see.

What are the three types of window cracks?

Pella engineers recognize three general types of window cracks: thermal stress cracks, impact cracks and pressure cracks. Thermal stress cracks typically begin at the edge of the glass and form at a perpendicular angle due to sudden temperature swings or shading changes. Impact cracks create a starburst pattern that radiates outward from a central point after the glass is struck. Pressure cracks resemble the curve of an hourglass and can occur in insulating glass windows when there are significant elevation differences or drastic pressure changes in the weather.

Are bay windows good for kitchens?

Yes. Bay windows are popular in kitchens because they extend outward from the home to create a more open feel, provide panoramic views and add additional space for seating, plants or décor.

What is a garden window in a kitchen?

A garden window extends outward from the wall in a box-like configuration with glass on multiple sides. The extended sill creates additional space for herbs, plants and décor while bringing natural light into the kitchen from multiple angles.

What is the best window to put over a kitchen sink?

Casement windows are widely considered one of the best choices for over-the-sink placement. Their crank handle makes them easier to operate when reaching over a counter, and they open wide for ventilation. Awning windows are another popular option because their horizontal shape fits naturally below upper cabinets.

Can I Repair My Windows Instead of Replacing Them?

In some cases, yes. Minor issues like hardware problems, worn weatherstripping, or a single cracked pane may be repairable. However, if the window frame is damaged or rotting, the seal between panes has failed, or the window is failing multiple performance signs, replacement is typically the more cost-effective long-term solution.

What is a good U-factor for windows?

For cold climates, look for 0.25 or lower. For moderate climates, 0.30 or lower is generally recommended.

Do energy-efficient windows qualify for a tax credit?

Yes. ENERGY STAR® certified windows may qualify for a 30% federal tax credit of up to $600 through 2032.

Should I replace all windows at once or one at a time?

Replacing all windows at once can reduce labor costs and create a consistent look throughout your home. A phased approach works well if budget requires prioritizing certain rooms first.

How long do windows last?

Window lifespan depends on frame material and maintenance. Vinyl windows typically last 20–40 years, fiberglass up to 50 years, wood 30 or more years with proper upkeep and aluminum windows 15–30 years.

Does upgrading window material increase home value?

Window replacement projects can contribute positively to resale value, particularly when they improve energy efficiency, curb appeal and overall home condition. According to the Remodeling 2020 Cost vs. Value Report, new vinyl windows can return homeowners more than 73% of the project cost at resale.*

Beyond material selection alone, buyers often respond to the overall condition and performance of the windows. If a home’s windows appear near the end of their lifespan, it may influence perceived value during a sale. Upgrading window materials can play a role in strengthening that perception, especially when the improvement aligns with the home’s architecture and the expectations of buyers in your market.

Is fiberglass worth the extra cost?

Fiberglass often appeals to homeowners seeking added durability and dimensional stability, particularly in climates with wide temperature swings. Whether it’s worth the cost depends on performance priorities and long-term expectations.

What adds the most to window replacement cost?

While every home is unique, the most significant drivers of project cost typically include the choice of premium frame materials, the complexity of a full-frame installation compared to an insert and the selection of specialized glass or custom-shaped units. Additionally, addressing unforeseen structural issues, such as frame rot or water damage discovered during the removal process, can also influence the final investment.

Does replacing more windows reduce cost per window?

Generally, yes. Larger projects allow for better labor efficiency and streamlined logistics, which may make the project more cost-effective on a per-unit basis.

Can I replace windows in phases?

Yes. Phasing a project is a common way to manage budget flexibility while still addressing your home's most immediate needs.

How long do replacement windows last?

Lifespan varies by material, installation quality and environmental exposure. Proper installation plays a key role in long-term performance.

Does full-frame replacement cost more?

Yes. Full-frame replacement generally costs more due to additional labor and materials.

Why do window quotes vary so much?

Quotes reflect differences in materials, window sizes, installation methods, regional labor rates and project complexity.

Can you replace a bow window with a bay window?

Yes, but it may require structural modifications since bow windows are larger and may have different framing requirements.

How do I know what windows to buy?

Consider your climate, budget, and how each room is used. Look for energy-efficient features, durable materials like vinyl or fiberglass, and a style that fits your space. A window professional can help guide your choice.

Is it worth it to buy expensive windows?

Yes—higher-end windows often offer better energy efficiency, durability and long-term savings on energy bills. They may also help boost your home’s resale value and require less maintenance over time.

Can I replace a flat window with a bow window?

In many cases, yes—but it may require structural changes. A professional installer can assess your space and determine what’s needed.

What’s the average cost to replace a bow window?

Costs can range widely depending on size, materials, and installation needs. On average, expect to pay between $3,000 and $10,000 or more.

What are the pros and cons of garden windows?

Garden windows house indoor plants which offer several health benefits including enhanced air quality, reduced stress and increased creativity. Plus, they bring in an abundance of natural light and add an aesthetic appeal.

Having plants inside your home requires daily upkeep such as watering and routine maintenance. They can also bring unwanted condensation and moisture.

What is the purpose of a garden window?

The purpose of a garden window is to offer plants and flowers a dedicated area to flourish in direct sunlight indoors.

Are arched windows back in style?

Arched windows are becoming popular for a variety of home types from traditional to modern. They offer a unique focal point while adding plenty of light to any space with their curved design.

What are the benefits of arched windows?

Arched windows add unique charm and character to any home. They are known to enhance natural lighting and fresh air, creating a brighter and more open space.

Did Victorian houses have sash windows?

Yes, sash windows were extremely common in Victorian homes — especially double-hung sash windows. These feature two movable panels (or sashes) that slide vertically, often adorned with decorative grilles or muntins. While similar in operation to their Georgian predecessors, Victorian sash windows tend to be larger and more elaborately styled, sometimes incorporating stained glass or arched tops for added character.

What is the difference between Victorian and Georgian windows?

Georgian windows are typically more uniform and symmetrical, often featuring smaller panes divided by glazing bars in a grid-like pattern. They commonly use six-over-six sash windows with minimal decoration. Victorian windows, by contrast, embraced more ornate design — larger panes, decorative glazing, stained glass, and asymmetrical placements were all common. Victorian styles also introduced bay and bow windows, as well as more elaborate trim and woodwork around the frames.

Are casement windows OK for egress?

Yes, casement windows are suitable for egress applications. Due to their design, which allows the entire window to open, they can provide a large enough opening to meet egress requirements. This makes them a favorable option for basements and bedrooms where emergency exits are necessary.

What are the standard sizes for casement windows?

Casement windows typically come in a range of standard sizes, usually starting at widths of 1 foot 2 inches (14 inches) and increasing in increments of 2 inches up to about 3 feet (36 inches). Heights usually range from 2 feet (24 inches) to 6 feet (72 inches), also in 2-inch increments. These standard sizes can vary slightly based on manufacturer, but they generally adhere to these dimensions to fit common architectural needs.

How thick should window trim be?

Window trim thickness typically ranges from 1/2" to 1" deep, with 3/4" being the most common. The width usually varies between 2.5" to 3.5" for standard windows, though craftsman and colonial styles may be wider.

What is cottage style window trim?

Cottage style window trim typically features simple, charming designs that complement casual, cozy aesthetics. It often includes:

Wider trim profiles than standard options
Slightly ornate but not overly decorative details
Often painted white or light colors
Sometimes includes a simple header piece above the window

What is the most popular window trim?

Currently, white painted trim remains one of the most popular choices for window casings. Its versatility, clean appearance, and ability to brighten spaces make it a favorite among homeowners and designers alike. For material, pine trim is particularly popular due to its affordability and versatility for both painting and staining.

How can you tell if a window is good quality?

Check for energy ratings like ENERGY STAR®, durable materials, solid construction, and smooth operation. Quality windows will seal tightly, resist warping, and offer performance features suited to your region.

What is the best type of window glass?

The "best" window glass depends on your specific needs. For most homes, Low-E glass with multiple panes offers an excellent balance of energy efficiency and comfort. However, your climate, budget and specific requirements should guide your choice.

What role do color and finishes play in mid-century window and door designs?

Colors and finishes in mid-century designs strike a balance between natural tones and bold accents. Wood finishes or neutral hues like brown and gray provide warmth and harmony, while vibrant colors like teal, orange, or avocado green add a playful touch. Matte or satin finishes are often chosen to keep the look polished yet understated.

How do door styles in mid-century homes differ from other designs?

Mid-century modern doors are known for their clean, minimalist approach, with simple flush panels, geometric patterns, and horizontal lines. Common features include sidelights and transoms, which invite more natural light into the home. Unlike more ornate styles, mid-century doors focus on subtle elegance, complementing the home’s overall streamlined aesthetic.

What are the most common window styles in mid-century homes?

Mid-century homes often highlight large picture windows, clerestory windows, and sliding glass doors. These designs embrace open spaces and blur the line between indoor and outdoor living. Picture windows offer expansive views and fill interiors with natural light. Clerestory windows, positioned high on walls, bring in light while preserving privacy. Sliding glass doors create seamless access to patios or decks, reinforcing the connection to nature that defines mid-century modern design.

What is the difference between Craftsman and Prairie style?

The main difference between Craftsman and Prairie style lies in their architectural focus and design elements. Craftsman style emphasizes hand-crafted woodwork, exposed beams, and earth tones, creating a warm, rustic look. Prairie style, on the other hand, focuses on horizontal lines, flat or hipped roofs, and the integration of the building with its landscape, often using a geometric window design and open interior spaces.

Can prairie grid windows work in modern homes?

Absolutely! Prairie style windows’ clean lines and simple designs complement modern architecture while adding visual interest.

What age is a Victorian house?

Victorian houses were typically built during Queen Victoria’s reign, from 1837 to 1901, making them over a century old today. Their exact age depends on the specific year they were constructed within that timeframe, typically placing them in the late 19th century.

How many bedrooms are in a Victorian house?

The number of bedrooms in a Victorian house varies widely depending on its size and design. Built as family homes, Victorian houses typically include three to ten or more bedrooms, often accommodating large families and live-in household staff. The spacious layouts reflect the social and practical needs of the era.

What state has the most Victorian homes?

California boasts a notable concentration of Victorian homes, particularly in cities like San Francisco, where historic neighborhoods showcase these architectural treasures. The Gold Rush and economic prosperity of the late 19th century spurred the construction of many Victorian-style homes in the state. Other states with significant numbers of Victorian houses include Massachusetts and New York.

Is 1900 Victorian or Edwardian?

The year 1900 falls within the Victorian era, as Queen Victoria’s reign lasted until January 1901. However, this transitional period between the Victorian and Edwardian eras means homes from around this time may feature a blend of both styles, reflecting evolving architectural trends and influences.

Are colorful window frames appropriate for cottage homes?

Absolutely. While natural wood and neutral tones are common, colorful frames — like red, green or blue — add a unique, inviting personality to your home.

Can I mix and match window shapes?

Yes! Combining arched windows, casement styles and dormer windows adds character and enhances the cozy charm of cottage-style architecture.

What should I consider when choosing the size of my front windows?

When selecting window sizes, consider the balance of your home’s facade, the amount of natural light you want and privacy needs. Ensure the size aligns with your home’s architectural style for a cohesive look.

Can I mix and match different window shapes on my front facade?

Yes, combining various window shapes, such as casement windows with transoms or specialty shapes, creates a unique and visually appealing design. This approach adds character and complements your home's overall aesthetic.

How can I balance natural light and privacy with front windows?

To balance light and privacy, consider innovative window treatments like between-the-glass blinds and shades, sheer curtains or frosted glass. Between-the-glass blinds and shades offer a unique solution by being tucked between panes of glass, protecting them from dust, damage and little hands. This design not only enhances privacy but also ensures easy maintenance and a sleek, uncluttered look.

What is the average cost of a bay window?

The average cost of a bay window typically ranges between $2,800 and $4,500, though prices vary based on factors like size, material and additional features or options. Customizations such as grilles, built-in blinds or more energy-efficient glass can also influence the final cost.

What style homes have bow windows?

Bow windows are a beautiful addition that can be found in a range of architectural styles. Frequently associated with Victorian and colonial homes, their gentle curves enhance the ornate details of these classic designs.

Are bow windows still in style?

Yes, bow windows continue to be in style, offering a unique and graceful architectural feature. As homeowners seek ways to increase natural light and create inviting living environments, bow windows remain a stylish choice that blends beauty with functionality.

What are the benefits of a bow window?

Bow windows provide a graceful, curved design that enhances a home's aesthetic while maximizing natural light and panoramic views. The multiple windowpanes create a sense of openness, making rooms feel larger and airier. Bow windows often create a charming nook for plants or seating, which can be particularly appealing for homeowners looking to add a unique touch to their living spaces.

Do bow windows increase home value?

Yes, bow windows can boost home value by enhancing both the exterior charm and interior ambiance. Their elegant, curved design adds a unique architectural element that stands out, while the expansive glass area brightens rooms and creates an inviting, open feel. This blend of style and practicality can make a home more appealing to buyers and contribute to a higher resale value.

What is the average cost of a bow window?

Bow windows generally range in price from $2,800 to $4,500, though costs vary widely based on details like dimensions, materials and any added customizations. Features like unique finishes, more energy-efficient glass or integrated blinds can add to the overall investment, allowing you to tailor the window to your home’s style and needs.

What is a garden window?

Garden windows are a designated place for plants to grow in the sunlight of a window. In many cases, a garden window extends outward beyond an exterior wall, creating a three-dimensional glass box for plants to live. Bay, bow and picture windows are popular choices but there are many window types that can help achieve the effect of a garden window.

How long does it take to install windows?

Depending on the type of installation (pocket replacement or full-frame replacement), it can take anywhere from a few hours to two days for a professional to install a window. This estimate assumes that the conditions of the project are ideal and no unexpected issues arise. It usually takes longer for homeowners who choose to install windows themselves.

What is a left vs. right venting sliding window?

Viewing from outside the home, a right-venting sliding window means it will slide open from left to right, and a left-venting sliding window means it will slide open from right to left.

What are the different types of windows?

Pella offers many different types of windows including: casement, double-hung, single-hung, awning, bay and bow, sliding, picture, custom and specialty. Discover the fundamentals you need to know when shopping for new windows, starting with the basics.

What are the benefits of wood windows?

Wood windows bring warmth and highly customizable features and options, while delivering excellent energy efficiency.

When should you use awning windows?

Awning windows are commonly found in bathrooms, living rooms or anywhere else where extra ventilation and light are required. Because of the top-hinged design, awning windows can still be opened in the rain.

What are the advantages of casement windows?

Easily opening and closing with a crank that folds away when not in use, casement windows are a great option for hard-to-reach spaces, like over the kitchen sink. They offer refreshing ventilation that is easy to control and direct in your home. Casement windows are also available with Pella exclusive hardware designs such as the Easy-Slide Operator which allows you to open and close your window with the same simple motion as dimming the lights with a dimmer switch.

How much do replacement windows cost?

A number of factors affect the price of a window, including window type, material, features and options such as grilles and hardware and more. To get accurate pricing for your unique project, schedule an in-home appointment with a local Pella expert.

When should you use a picture window?

Picture windows do not operate, so they are common in areas that are out of reach. They add natural light and increase curb appeal in places where you don't need the window to ventilate, such as tall foyers and stairways.

Are awning windows secure?

Awning windows are very secure. They can only be opened with a crank on the inside and the common placement high on the wall further increases security.

How do I clean a single-hung window from the inside?

On select product lines, the bottom sash of single-hung windows tilts in, making it easy to clean both the interior and exterior surfaces from inside the home. Since the top sash is stationary, the exterior surface of the upper half will need to be cleaned from outside the home. View step-by-step cleaning instructions in this video.

Where is a casement window used?

Because casement windows are easy to operate with one hand, they are commonly used in hard-to-reach areas like over a kitchen sink or bathtub. Casement windows are also popular in bedrooms, living rooms and home offices.

How are replacement windows installed?

There are two types of methods for installing replacement windows. The complexity of your window renovation project will determine which method is right for you. Pocket installation is the easiest route. This type of installation is used when you are replacing the same type or size of the window. If you’re doing a more complex upgrade to your existing windows, you’ll have to look into full-frame installation. As far as who does the installation? You can work directly with one of our distributor installers who are versed in all things Pella windows or look into hiring an independent contractor locally.

What are French windows?

Similar to a hinged French door, French windows have two sashes with hinges on the side. One sash opens to the left and the other to the right to create a wide opening. With no central post in the window frame, French window panels offer more ventilation and an unobstructed view.

What are glazed windows?

Glazing refers to the glass installed in the window frame. A window with one pane of glass is called a single-glazed window. Windows with two panes of glass are double-glazed windows. Double- and triple-glazed windows are more efficient than single-glazed windows.

What are egress windows?

Egress windows are large openings that offer a secondary exit in case of an emergency. They can also add more natural light and make your basement feel more inviting. Basement bedrooms and living spaces are required to have egress windows.

What are clad windows?

Durable aluminum cladding on the exterior of wood windows makes them easier to maintain and provides advanced protection against the elements. Learn more about wood windows.

What causes condensation in windows?

Most of the time, interior or exterior condensation on your windows is a matter of temperature and humidity. When the air is hotter and more humid on one side of the glass, moisture collects on the window panes. If you see condensation in between pieces of insulated glass on dual-pane or triple-pane windows, it’s usually an indication of glass seal failure. You can help reduce window condensation with these tips.

How do you know when it's time to replace windows?

Great windows offer ventilation, look beautiful, help save energy, reduce noise and keep your space safe. If your windows aren’t doing one or more of those things, it may be a sign your windows need replacing. This article shares five situations to help you decide if your windows could be doing more for you and your lifestyle.

Can you put new construction windows in an existing home?

For most existing homes, replacement windows are the best option, but in rare cases it is beneficial to put new construction windows in an existing home. If the window frames in your existing home are in poor condition, the existing window frames would have to be removed and replaced before adding a new window. New construction windows require the studs in your home to be exposed, so in this situation new construction windows might be the best choice.

What product lines are made of vinyl?

Pella offers the following product lines made of vinyl: Pella® 250 Series, Encompass by Pella®, Pella® Hurricane Shield Series™ and Pella® Defender Series™. Pella® 150 Series is also made of vinyl, sold exclusively through Lowe's. ThermaStar by Pella® is available in the East only, exclusively through Lowe's.

What product lines are made of fiberglass?

Pella® Impervia® is the only product line made of our proprietary fiberglass. This product line offers windows and sliding patio doors. There are also many front entry doors available in fiberglass.

How long do fiberglass windows last?

There are many factors that affect the actual long-term performance, appearance and functionality of fiberglass windows, but Pella's fiberglass windows are designed for a lifetime of everyday use.

What is the most durable window?

Pella’s proprietary fiberglass is the strongest material for windows, engineered for lasting durability.⁶¹ Our exclusive fiberglass will never rot or corrode, and it resists dents, bends and breaks.

Are wood windows worth it?

Wood windows have a lot to offer: beauty, warmth, design flexibility, energy efficiency, durability, customization and more. But the answer depends on your unique needs. If you're looking for a window that's low maintenance and budget friendly, vinyl might be a better choice.

Are wood windows expensive?

We offer several wood product lines to meet your style and budget needs. The final price will depend on which product line and window type you choose, along with the features and options you select. In terms of wood window product lines, Pella® Reserve™ and Architect Series® windows are tailor-made and feature detailed craftsmanship, usually more expensive than Lifestyle Series windows.

How do sliding windows open?

Sliding windows glide sideways on a track from either the left or the right side. One operable sash overlaps the other stationary sash when opened.

What is the difference between casement and awning windows?

The difference between casement and awning windows is the placement of the hinged side. Casement windows are hinged at either the left or right side. Awning windows are hinged at the top. Both casement and awning windows swing outward to open and close with a crank that folds away when not in use.

How do double-hung windows open?

Double-hung windows have two sashes that slide up and down independent of one another. They can be raised from the bottom or lowered from the top with sashes that tilt in for easy cleaning.

How long do windows last?

It depends on the quality and type of material the window is made of, the local climate and weather events, how well the window was installed, how often the window is opened, how often maintenance is performed and more.

Why are my windows foggy?

Condensation on the interior or exterior of a window often indicates high humidity levels and is nothing to worry about. Condensation between panes of insulating glass, however, can develop when the seal between panes of glass fail and allows moisture to leak in.

What are half circle windows called?

Half circle windows are also known as semicircle windows, full chord windows, or half round windows.

Are windows cheaper than walls?

Walls of windows are typically more expensive than a traditional wall. Window walls require special structural considerations, and windows are typically more expensive than drywall.

Why should I choose a local Pella store for my window and door replacement?

Window and door replacement is simple and worry-free with the Pella Promise. You’ll get a dedicated expert to guide you through the process, the right products for your needs, and a no-mess installation by certified installers. Available exclusively through an in-home consultation, we can ensure you have peace of mind with our industry-leading warranties. Experience the difference with Pella. Read more about the Pella Promise.

How do I evaluate the cost of a window or door replacement project?

There are two main sources of cost. First, the products – including the features and options you choose. And second, the installation cost – including labor. The cost of your project will depend on the needs of your unique home. When you're ready, you can schedule a free, in-home consultation for a quote.

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