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. 

Our Learning Center has information on window styles, how to compare energy performance, new trends, and information to help you avoid getting scammed.


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 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.

What Our Customers Have To Say

I had windows installed by a different company a couple of years ago and the process was very time consuming and painful. Every company would not give a price over the phone or internet which resulted in a couple of hours of high pressured sales pitches. When I needed to replace my sliding patio door I knew I didn't want to go through my previous experiences and remembered my neighbor used Jantek and was completely satisfied with their work. So I submitted an online request for a quote, and received it within 24 hours. I went into the Medford showroom to check out the product and was pleased with the quality of the door. Within a couple of weeks I had a new well-crafted sliding door for the holidays. Ryan who installed the door did a great job. I highly recommend Jantek Windows and I am completely satisfied!

Donna C.

via Google
Replaced 45 windows with Jantek. They were awesome. Nice people. Great work. Quality windows at a great price.
Interior view of Casement Windows above kitchen sink

Mike G.

via Google
Our new windows look great and are easy to operate. Price was excellent when compared to other companies. Installers were professional and knowledgeable.

Jade C.

via Facebook
Our new windows look great and are easy to operate. Price was excellent when compared to other companies. Installers were professional and knowledgeable.

Debbie M.

via Facebook
Jantek Windows installers installing large slider windows.