High-Performance Replacement Windows

Free Quote

Ask About Financing

Bright window seat surrounded by three large arched windows with white frames and views of a green landscape.
White vinyl bay window with a brown metal roof overhang, installed on a red brick exterior wall with sky and telephone pole reflections.

Serving Brooklyn, Queens, Staten Island & Central New Jersey

Transform Your Home With Window Replacement

TopLine Home Improvement has been a leader in window replacement for homes in Brooklyn, Queens, Staten Island, and Central New Jersey since 1981. As a local, family-owned and operated replacement window company with an A+ Better Business Bureau rating and hundreds of five-star reviews, we understand which windows perform best on local homes. That’s why we offer OKNA replacement windows, which deliver a lifetime of enhanced curb appeal, energy efficiency, and performance.

A Wide Selection of Window Styles

Two-story grey home with white trim, multiple gables, and a porch swing under a covered front entryway.
Double-Hung Windows

The most common window style, double-hung windows give a traditional look to any home. These windows have two separate vertically adjustable sashes so they can easily be moved up & down for ventilation. The sashes interlock for great energy efficiency and they can tilt in, allowing you to easily and safely clean the window from inside your home.

Arched window with decorative grilles set into the green stucco gabled upper story of a house with dark roof shingles.
Casement Windows

These windows have an adjustable sash that’s hinged from one side and opens outwards. The sash is controlled by an easy to use, fold in crank handle and is versatile, opening to a full 90-degree angle or less for easier cleaning and more ventilation options. A lever lock on the side of the window ensures an airtight seal between the sash & frame for exceptional energy efficiency.

Line of white-framed awning windows, with one opened, set into a modern light-grey curved wall.
Awning Windows

Awning windows provide a sash that’s hinged from the top and crank out from the bottom via an easy-to-use, fold-in handle. It opens to a 45-degree angle, giving it an awning-like profile and allowing for ventilation even when raining or snowing. Being a smaller size, awning windows are great for tight areas in a home where you want to obtain more sunlight and ventilation.

Four-lite white bow window installed on a light-colored faux stone exterior wall next to a white storm door.
Bay & Bow Windows

These windows project outwards with an insulated head & seat board that has a furniture grade birch finish. A bay window provides a deeper projection of either 30- or 45-degree angles and comprises a choice of double-hung, casement, or picture windows. Bow windows are arranged with casement or picture windows, have a shallower projection of 10- or 15-degree angles.

Bright, minimalist bedroom featuring a bed in front of large picture windows, flanked by potted bamboo trees.
Picture Windows

These windows offer a great choice for homeowners looking to make the most of their views and ensure optimal energy efficiency. Picture windows are typically larger and provide large, unobstructed views of the outdoors. They are known for their efficiency and durability, having a fixed sash and being without moving components like rails or mullions.

Modern kitchen with grey cabinets, white tile backsplash, and a wide horizontal hopper window above the sink.
Hopper Windows

A popular style for basements or other tight areas of a home where you want to add sunlight and ventilation, hopper windows are hinged from the bottom and tilt 45 degrees by way of an easy-to-use, locking handle that gives an air-tight seal when closed. This style prevents dirt or other debris from entering a living area while brightening up a space with light and fresh air.

Outdoor wooden deck with patio furniture, a freestanding porch swing, and a white sliding glass door leading into the house.
Horizontal Sliders

Horizontal slider windows offer a sleek, functional design perfect for modern living. With smooth-gliding sashes, they provide easy operation, excellent ventilation, and wide views of the outdoors. Their low-maintenance design makes them a practical choice, while energy-efficient options help improve comfort and reduce utility costs. Available in various materials, sizes, and finishes, horizontal slider windows complement a wide range of home styles while adding lasting value and visual appeal.

Sunroom dining area surrounded by large arched windows with grid patterns overlooking a lush green yard.
Custom Shaped Windows

These windows provide options for more dissimilar or different types of window openings in a home. Custom shaped windows are typically manufactured with either a stationary window sash, like a picture window, or a crank-out sash, like either a casement or awning window. Such windows lend a home greater distinction while securing more sunlight and possible ventilation.

Two white double-hung windows with Prairie-style grids installed on a house with dark grey lap siding and a low brick accent wall.

Expert Window Installation & White-Glove Service

At TopLine Home Improvement, our window installation process ensures your new windows provide lasting performance, energy efficiency, and beauty.

Our OKNA-certified professionals deliver exceptional craftsmanship by carefully measuring, fitting, and sealing each window, guaranteeing optimal performance and longevity. With our exclusive white glove service, we manage every aspect of your installation—from initial consultation through final cleanup—ensuring your home remains spotless and your experience stress-free. Trust our highly trained team to treat your home with utmost care, delivering flawless results every time.

Premium OKNA Windows to Suit Your Needs & Budget

Woman reading a book on a sofa in a brightly lit room featuring three large white picture windows with transom lights above them.
Enviro-Star
(800 Series)

The premium Enviro-Star (800 Series) by OKNA represents the pinnacle of window technology, combining ultra-high efficiency HeatSeal glass with insulated frames for unparalleled energy savings. Engineered for maximum durability, security, and style, these windows drastically lower heating and cooling costs, offering the ultimate blend of luxury, performance, and sustainability for discerning homeowners.

Suburban home featuring cream siding, green trim around arched accent windows, a front garage, and green porch steps under a bright blue sky.
Casement
(700 Series)

OKNA Casement (700 Series) windows deliver optimal ventilation and unobstructed views, operated smoothly by an easy-to-use crank mechanism. With superior weather stripping, advanced locking mechanisms, and robust construction, these windows offer unmatched protection against harsh weather, enhancing security while maintaining elegant aesthetics and efficient thermal performance for any home.

Bright, modern living room featuring a white couch with pink pillows positioned in front of three large double-hung windows framed by sheer white curtains and potted plants.
Insul-Tec
(500 Series)

OKNA’s Insul-Tec (500 Series) windows offer excellent thermal performance with advanced insulated frames and sashes. Engineered with a multi-chambered vinyl construction and optional foam insulation, these windows significantly improve energy efficiency, reduce noise, and maintain consistent indoor temperatures. Ideal for homeowners looking to balance comfort, energy savings, and affordability.

OKNA Enviro-Star Windows

Incredible Performance at an Incredible Value
Line icon of a glass window repelling cold wind and snowflakes, symbolizing thermal insulation or energy efficiency.

Air Infiltration

Air infiltration measures the volume of outside air passing through window joints or cracks. Measured in cubic feet per minute on a scale of 0 to 1, windows with lower numbers perform best.

OKNA Enviro-Star Windows have air infiltration rating of .01 cfm/ft, which is 2,000% better than the industry average

Line icon showing a double-pane glass window bouncing thermal energy waves back, accompanied by a thermometer indicating cold temperatures.

U-Factor

U-factor measures how effectively windows prevent heat transfer, expressed. Lower numbers indicate better insulation and improved overall energy efficiency performance.

OKNA Enviro-Star Windows have U-ratings between .26 and .16

A line icon depicting a double-pane glass window blocking and reflecting solar heat/radiation from a bright sun, with only a small portion passing through. This illustrates the Solar Heat Gain Coefficient (SHGC) or Low-E glass thermal protection.

Solar Heat Gain Coefficient

Solar Heat Gain Coefficient (SHGC) indicates how much solar radiation passes through windows, measured from 0 to 1. Lower ratings indicate reduced unwanted heat entry.

OKNA Enviro-Star Windows’s SHGC is .26 to .22

A line icon showing a window reflecting interior heat waves back inside while preventing drafty wind elements from penetrating, illustrating Design Pressure (DP) or structural/air infiltration resistance.

Design Pressure

Design pressure (DP) assesses window strength, resistance to wind pressure, and structural integrity, measured in pounds per square foot (psf); higher DP indicates greater durability.

OKNA Enviro-Star Windows can withstand winds of up to 187 mph

Keystone Certifications Logo

Keystone Certified Replacement Windows

When you purchase a window or patio door that is advertised as the most energy efficient, you want to be sure the claims are based on facts, certified by a truly independent and objective authority.

All OKNA windows and doors meet rigorous North American Fenestration Standard (NAFS). Certification is performed by The Keystone Certification Program.

A white horizontal sliding window positioned directly above a kitchen sink, set against a light grey stacked stone backsplash. The window frames a lush, green view of trees and foliage outdoors, while a dark bronze gooseneck faucet is mounted on the white marble countertop in front of it.

Energy-Saving Features of OKNA Replacement Windows

OKNA replacement windows offer homeowners advanced technology designed specifically to maximize energy efficiency, minimize heating and cooling costs, and ensure year-round comfort. From durable construction to innovative insulation methods, these windows are an investment that significantly reduces energy bills while enhancing your home's overall thermal performance. Key features contributing directly to energy savings include:

  • Insulated uPVC Vinyl Frames and Sashes – Engineered with multiple insulating chambers, these frames and sashes greatly improve thermal performance and prevent energy loss.
  • HeatSeal Insulated Glass Unit (IGU) – This advanced glass unit provides superior insulation, significantly enhancing interior comfort and cutting down on long-term energy expenses.
  • Magnetic Seal – Creates an airtight closure, effectively blocking drafts and further reducing energy consumption.

OKNA Windows Thermal Performance Packages

A cross-section diagram of an insulated vinyl window frame corner, showcasing internal foam filling (pink insulation) inside the multi-chambered sash and frame profiles, alongside a double-pane glass unit.

HeatSeal Deluxe

  • Double-Pane Glass Unit
  • Low-E Glass
  • Argon Glass
  • Foam-Filled Extrusions
  • Locking Screen
  • U Factor: 0.26
  • SHGC: 0.26
  • Air Leakage: 0.01 cfm/ft
Cross-section diagram of a triple-pane vinyl window corner with foam-insulated frame chambers.

HeatSeal Triple Deluxe XR15

  • Triple-Pane Glass Unit
  • Low-E Glass
  • Argon Glass
  • Foam-Filled Extrusions
  • Locking Screen
  • U Factor: 0.19
  • SHGC: 0.22
  • Air Leakage: 0.01 cfm/ft
Cross-section diagram of a triple-pane vinyl window corner with foam-insulated frame chambers.

HeatSeal Triple Deluxe XR10

  • Triple-Pane Glass Unit
  • Low-E Glass
  • Krypton Gas
  • Foam-Filled Extrusions
  • Locking Screen
  • U Factor: 0.16  
  • SHGC: 0.22
  • Air Leakage: 0.01 cfm/ft

Ironclad Warranties Badge

Outstanding Warranties

TopLine Home Improvement backs our products and workmanship with some of the best warranties in the industry, including true lifetime warranties for workmanship and material on our windows and doors. You can enjoy decades of guaranteed worry-free performance and style.

Brochures

Certified Quality and Energy Performance

Logos for industry certification bodies and energy efficiency standards: NFRC (National Fenestration Rating Council), Energy Star Most Efficient 2025, Keystone Certifications, Inc., and AAMA (American Architectural Manufacturers Association).

See the Difference Quality Craftsmanship Makes

Windows Transformations

Customer Testimonials

See What Homeowners Have to Say About Partnering With TopLine Home Improvement

“Working with TopLine was a great experience. They made me and my mom feel valued as customers. Their prices were competitive and their work impeccable.”

Karen W.

“Great service, high quality product and good price. We were replacing windows in two rental apartments, TopLine was recommended by a neighbor and I could not be happier with the final result.”

Justyna K.

“We couldn’t be happier with the finished product. The team was courteous and respectful. Did a great cleanup when the job was complete. We would recommend TopLine to anyone looking to give their home an upgrade!”

Patrick B.

“Highly recommended! Excellent windows and craftsmanship at a reasonable price. Nick was professional, responsive, and easy to work with. We are very happy with our new windows.”

Jack F.

“Windows arrived when they were promised. The work was thorough and the workers were meticulous. I am delighted that my drafts are gone. Thank you TopLine!”

Mary A.

“To rate TopLine would take so many words. They get the job done and the guys who came to install my doors were fantastic and extremely professional. Words are not enough to rave about how everything went from start to completion.”

A.C.

BBB A+ Logo
A+
Rating
Facebook Logo
5.0
Rating
Google Logo
4.9
Rating
Yelp Logo
4.5
Rating

Trusted by the best in the business!

OKNA logo
James Hardie Logo
Home Guard Doors & Windows logo
Provia
Alside Logo
Andersen Windows & Doors Logo
Owens Corning Logo
PlyGem Logo
Your Local Experts

Contact Us

Bright, sunny daytime view of the Topline Home Improvement brick building with blue signage advertising windows, doors, roofing, and siding.

Address
2056 Utica Avenue
Brooklyn, NY 11234
Get Directions
Hours

Monday - Friday: 9:30 AM - 4:00 PM
Saturday: 10:00 AM - 3:00 PM (evenings by appointment)
Sunday: Closed

Phone Number
(718) 769-4555
© 2026 TopLine Home Improvement. All Rights Reserved
Lead Safe Certified Form Badge

NYC HIC #834535
NJ HIC #13VH13206300