Free Estimate!

Call or Text us too!

Free Estimate!

Call or Text us too!

In addition to being one of the most popular replacement windows here at Wonder Windows, the OKNA 520 Series window has features commonly found on more expensive designer windows.

They've soared in popularity in the past decade, and are a popular favorite here in Rochester. Artisan-inspired craftsmanship, coupled with distinct lines and a neutral design style, the 520 Series is ideal for those seeking a perfect balance of energy efficiency, low maintenance and traditionally modern design.

OKNA 520 Sliding WindowEnhance your window with stainless steel, brass or bronze handles and locking mechanisms.

  • Ideal for both replacement windows and new home construction
  • Dual-layered insulation interlocks tightly for enhanced efficiency
  • Designed to work universally with a broad scope of hardware
  • Innovative condensation and draft-prevention technology
  • Thermal efficiency enhanced by patented Heatseal® spacer
  • Renowned for its chambered maintenance-free vinyl design
  • Rugged 3.25" deep-welded frame for exceptional durability
  • Increased security with locking screens and enhanced locks
  • Comes standard with high-quality fiberglass mesh half-screen
  • Specially designed to withstand harsh WNY weather conditions
  • Looking for picture windows in a special shapes or sizes? The OKNA 810 Series of high quality picture windows is available in a huge selction of shapes, sizes and custom designs.  You will never have to settle for a design you don't like, or make much more expensive structural alterations.

  • The rugged 3.25" durable welded frame, increases the support and strength of the 810 series picture window, while adding to its already exquisite design.  It's one of the benchmark characteristics that makes OKNA Picture Windows one of the most long-lasting & popular windows in Rochester NY.

  • It is well known that OKNA picture windows have extraordinary wind, sun and moisture resistance properties.  This has made them one of the best-selling picture windows in Western NY.  You'll get year-round protection from whatever Mother Nature can subject your new windows to. No leaks, no condensation, no astronomical price tags.

  • The OKNA 810 Picture Window series has been specifically designed to prevent and eliminate drafts.  Whether it's keeping the AC in during the summer, or keeping the heat inside during the winter months, you can trust that your 810 series will be going strong.

    Wonder Windows has decades of expereince installing OKNA picture windows, and guarantee that yours will be installed perfectly, professionally and at the very best rates.


Interior Options

Our company offers two interior colors in addition to our standard Euro-White to give your home a distinct look.

Optional colors are available at additional cost.




Onyx Black

Exterior Options

Okna Windows offers six exterior stock color selections in addition to the standard Euro-White option to give your house a distinct look and enhance its curb appeal. You can also select custom exterior colors from a virtually unlimited selection of paints. Our paints are environmentally safe and durable, giving your exterior a vibrant and long-lasting color finish.



Terra Brown


Basic Brown


Nicol's Black

Custom Colors


GBG grilles consist of aluminum bars sealed in the insulation airspace between the two panes of glass. Because the interior and exterior glass surfaces are not affected, cleaning your windows is a much easier task.

Permanent interior and exterior grids with spacer will provide a truly authentic look. Interior grids are available in Euro-White or wood laminates to match your home's decor. External grids are available in Euro-White or colors to match product exterior.

Flat Grid

Contour Grid

Grid Patterns

Are you looking for a stunning design detail to instantly set your home apart both inside and out? A choice of decorative grilles for your Okna Windows & Doors can highlight the architectural style that speaks to you.




Performance Options Available - Insul-Tec

          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed            
with ESP 0.27 0.30 0.54 62 0.30 10% Better than ENERGYSTAR®
Deluxe 0.26 0.30 0.54 62 0.30 13% Better
Triple Glazed            
with ESP 0.21 0.26 0.42 70 0.30 30% Better than ENERGYSTAR®
Deluxe 0.20 0.26 0.42 71 0.30 33% Better
Deluxe w/krypton 0.16 0.26 0.42 74 0.30 47% Better than ENERGYSTAR®
U-Value, SHGC, VT, CR values may slightly change for windows made with GBG (Grids Between Glass)
  • SHGC - Solar Heat Gain Coefficient
  • VT - Visible Transmittance
  • CR - Condensation Resistance
  • Deluxe - ESP & Foam
  • * Northern Climate Zone
**   Industry Comparison To
  Our Windows Minimum Industry Minimum
AAMA Rating (38 x 63) R40 R15  
Air Infiltration cfm/ft2 0.09 0.3 333% Better than ENERGYSTAR®
Water Penetration mph 59 33 79% Better than ENERGYSTAR®
Structural Integrity mph 153 94 63% Better than ENERGYSTAR®

Water Penetration mph - Specifies wind load pressure in mph a window can withstand without leaking, under rain equivalent to 8" per hour. Structural Integrity mph - Wind load in mph a window can withstand before breaking.

All results numbers are based on tested window sample by NFRC & AAMA testing window guidelines. Use for comparison purposes only. Actual values may vary depending on installation, size of the window, and other conditions.