Locally Designed, Manufactured, and Installed,
Energy Efficient Replacement Windows & Patio Doors
(609) 881-2400


Established in 1995, Jantek was determined to be an industry leader in the vinyl replacement window and patio door industry. The goal was to build a company that makes the window and patio door buying and installation process easy, trustworthy, and reliable.

The business model was built around manufacturing well made, energy efficient replacement windows and sliding patio doors at a fair price to their customers. Without using hard-sell or deceptive sales tactics.

Interior view of contractor installing windows.

To do this, an expert team was assembled that included, engineers, product specialists, and installers. Manufacturing was streamlined to ensure their products were accurate and turned around quickly.  


In 2019 Jantek was met with a new challenge when in home estimating was temporarily prohibited. But Jantek was in a unique position; because they manufactured and installed their own brand of vinyl replacement windows and sliding patio doors, and there is no middleman to contend with, they could accurately quote costs without having to visit the home. The on-line TeleEstimate form takes less than 5 minutes to complete and doesn't require measurements to get you a quote. 


Jantek rolled out their EnergyMiser product line in 2022 as part of their continuous improvement, comprehensive approach to manufacturing. EnergyMiser combined intelligent engineering with superior materials. Multi-chamber, reinforced frames, fusion welding, and triple pane low-E glass are just some of what allows Jantek to achieve their superior ratings.

Jantek continually improves their product lines and processes. Scroll down to read the reviews and see for yourself why Jantek is considered one of the best replacement window companies in the area. 


Get an accurate quote for replacement windows & patio doors without the sales visit.

Because we manufacture and install our custom line of windows and patio doors, we can accurately quote your project without a sales visit.


Jantek Window & Doors is a locally operated vinyl window replacement and sliding patio door manufacturer and installer. All Jantek’s replacement windows and doors are made to order and are custom sized to fit your needs.

  • While Jantek does staff an expert team of window and patio door installers, we only install Jantek manufactured products.
  • The minimum number of replacement windows with installation service is 3. However, our prices are very competitive-so getting 3 windows from Jantek may be the same price as getting just 1 from another supplier. Since we offer no-sales visit estimates, including Jantek’s pricing when getting comparative estimates won’t include a lengthy appointment with a sales representative.
  • If you are placing a product only order, there is not a minimum requirement.

    Need service on your Jantek windows or patio door? Click to visit the Jantek Service Portal.

  • We only provide service on Jantek products, as outlined in our transferrable warranty.
  • Our EnergyMiser windows and doors are an exclusive proprietary design. We cannot provide service to products other than Jantek as our parts are not compatible with other providers.
  • This restriction includes broken glass and screens.

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  • Southern New Jersey
  • Central New Jersey
  • Camden County
  • Ocean County
  • Atlantic County
  • Gloucester County
  • Mercer County
  • Monmouth County
  • Philadelphia, PA
  • Bucks County, PA


We welcome visitors to our showroom Monday through Friday- 9:00am-5:00pm.

Our EnergyMiser Windows and Doors are our Best Rated Replacement Windows. We encourage you to compare our prices, energy ratings, and product value before you buy.

What Our Customers Have To Say

We purchased 8 windows upstairs and sliding glass door for the back! The windows are beautiful and keep the cold out! Excellent windows. They go up and down easily and fold in for easy cleaning! Not heavy! Smooth! Excellent product! Thank you Jantek!

Michelle Bonomo Savino

via Facebook
I used Jantek to replace 12 windows and they did a great job. There was no high pressure sales and all measurements and installs were done on time and met all Covid requirements. I would definitely recommend!

Duane Jones

via Facebook
I recently had 3 windows replaced by Jantek and am very happy with my purchase. They were very responsive during this crazy Covid time, answered all my questions and did great quality work... I would definitely recommend their to others!

Laüren Skrabonja Davis

via Facebook
The reps that replaced all 23 of our windows were on time both days and efficient. They were mindful of cleaning up after themselves as they completed each window. All around it was a great experience.

Chase Hendrickson

via Facebook

Learn why this retired couple decided it was time to replace the windows in their authentic log cabin.

Hear what their experience was working with Jantek.