Locally Designed, Custom 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, custom sized, energy efficient replacement windows and sliding patio doors at a fair price to their customers. Jantek does not use 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.

Join our team! Visit our Job Opportunities page for current job openings.


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 energy efficient, made to order, and are custom sized to fit your needs.

  • Jantek is a full service home replacement window provider. Your custom windows are made in Medford, NJ and installed by a staff of qualified window install experts.
  • 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 replacement 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.


  • 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 home replacement Windows and Patio Doors are our energy efficient and some of the best rated replacement windows on the market. We encourage you to compare our prices, energy ratings, and product value before you buy.

Skip the sales visit with our

or call (609) 881-2400

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

Here's what our customers are saying:

I needed to replace a patio door. I went to 3 different places to try and get an estimate, but kept getting the run around. I was told it would take 2 to 3 months to order the door. Walked into Jantek and picked out a door and ordered it. Within 3 weeks it was installed. Wow.   SCOTT M.

I am extremely satisfied with my new triple pane, double hung windows. Jantek was the fairest quote of 3 and offered the best window rating to keep my home insulated from winter and reflective to the suns hot heat in the summer. I already see my HVAC system working less.  JACQUELINE M.

Recently used Jantek to replace my sliding glass door, which I love, as it has now cut down on drafts in my front room!! They were very quick and professional from taking measurements to installation! I will definitely be having them back out to replace my bay windows later this year!!  ELIZABETH P.

Jantek installed a new custom slider to replace the existing 37-year-old wood doors. Pricing was much better than the large companies and beat the other two estimates we got. The door looks great, and the process was simple. In and out in a few hours with no mess.    DOUGLAS M.

After comparing Jantek to Lowes, we decided Jantek service and prices was the winning choice. Now that our installation is complete, we are happy we went with Jantek. The guys worked super hard and neatly on the coldest day of the year. Our house is already warmer.    KAREN W.