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  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon335
    Verified door services reviews

Top-Rated Door pros in Mountainside - Updated Nov 2026

Avatar for Monk's Home Improvements Inc.
Monk's Home Improvements Inc.
4.7(
600
)
Doors (Exterior) - Install or Replace

Serving Mountainside, NJ and surrounding areas

Approved (Corporate)

In business since 2007

Free estimates

Credit card accepted

Along with the Monk's Kitchen & Bath Design Studio, we are a full-service home improvement provider. Monk's will help you plan, design, and purchase everything you need for a remodel. Then our expert craftsmen will install everything and our painters will come and complete the job.

Recessed Shelving
Reach-In Closets
My jobs
My jobs
My jobs

+19

4 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for A Condo LLC
A Condo LLC
4.8(
124
)
Doors (Exterior) - Install or ReplaceDoors (Interior) - Install or Replace

Serving Mountainside, NJ and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"I had a plain living room wall and wanted to install a electric fireplace with a stone wall accent. I had an idea of what i wanted but didn't have an exact plan etc.. A Condo LLC were professional and very easy to work with especially with some of the changes i made. The tile guy was very detailed and the project came out wonderful!"
Bathroom remodeling
Built in bookshelf
Bathroom remodeling
Before
Bathroom remodeling

+57

Response time3 days
Response rate100%
1 neighbors recently requested a quote
Avatar for Indigo Construction Co.
Indigo Construction Co.
5.0(
24
)
Doors (Exterior) - Install or ReplaceDoors (Exterior) - Install or Replace - For BusinessDoors (Interior) - Install or Replace+6 more

Serving Mountainside, NJ and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Emergency services offered

"We couldn’t have replaced this door with a better expert. Ryan took measurements and photos, then recommended several doors in various price ranges. We didn’t realize how many options come with storm doors. Ryan gave us some really good recommendations and helped us make a great choice. He installed the door in a half day while we were out. Came back to a gorgeous door/screen storm door combo- something we weren’t even sure could have been done to begin with. Important to know:Throughout the entire process, Ryan was responsive and easy to reach. That’s vital in a world where ghosting is the norm (unfortunately). Ryan is the expert you need for your remodeling needs. Highly recommend!"
Doors Project
Remodeling - Kitchen & Bathroom Project
Buena Vista
N. Mich
Remodeling - General Project

+64

Response time1 day
Response rate100%
4 neighbors recently requested a quote
Avatar for Mr. Handyman of S. Orange/Westfield/Scotch Plains & Metuchen
Mr. Handyman of S. Orange/Westfield/Scotch Plains & Metuchen
4.5(
516
)
Doors (Exterior) - Install or ReplaceDoors (Exterior) - Install or Replace - For BusinessDoors (Interior) - Install or Replace+12 more

Serving Mountainside, NJ and surrounding areas

Approved

In business since 2008

Warranties offered

Credit card accepted

"Kassi scheduled our work very promptly and another staff member followed up on the details. Everything went smoothly on the day, and took less time than I expected. John was friendly and efficient -- taking care of business in short order. Replacing the light fixtures by our front door was a little tricky re: the cedar siding, but he effortlessly adapted the installation to the situation. Perfect! The old wooden post mailbox was rotted and barely standing...he took it all away, dug a deep new hole and installed the steel post, using quick setting concrete, and fitted the new mailbox. He even scalped some sod to leave on top... When John was finished, you would have thought the mailbox had always been there. I plan on calling on Mr. Handyman, and John, in the future."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+350

Response time3 days
Response rate100%
2 neighbors recently requested a quote
Avatar for AMS Home Improvements, LLC
AMS Home Improvements, LLC
4.8(
100
)
Doors (Exterior) - Install or ReplaceDoors (Interior) - Install or Replace

Serving Mountainside, NJ and surrounding areas

Approved

In business since 1996

Free estimates

Warranties offered

"Very pleased with the new deck and patio door installation. Armando and AMS team did all the work on time and to our specifications. I am bumping AMS up to five starts for Armando's responsiveness and attention to detail. Nights or weekends, Armando always made time for us and was always responsive to our questions and concerns. A+++"
AMS
AMS Home Improvements
AMS Home Improvements
AMS Home Improvements
AMS Home Improvements

+38

Response time1 day
2 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for CSZ Construction
CSZ Construction
4.6(
69
)
Doors (Exterior) - Install or ReplaceDoors (Exterior) - Install or Replace - For BusinessDoors (Interior) - Install or Replace+11 more

Serving Mountainside, NJ and surrounding areas

Approved

In business since 1998

Free estimates

Emergency services offered

"Cesar does great work. He is reliable, kind and responsive. He replaced my kitchen cabinet doors, he installed my new bathroom: including vanity, medicine cabinet, light fixture, tile flooring, and toilet. All came out perfect. He replaced old closet doors with new bi-fold doors, and he helped with many other details I needed. I will definitely be using him again, I am very happy with everything!"
 ALL COLUMNS FINISH
OLD DECK
Livinroom
 PAINTING
PREPARING FOOTINGS

+168

Recommended by93%of homeowners
Avatar for NJ Window Experts LLC
NJ Window Experts LLC
4.9(
10
)
Sliding Door - Install

Serving Mountainside, NJ and surrounding areas

Approved

Free estimates

Warranties offered

Small jobs welcome

"I had a few things that I wanted done it all started with one bedroom window, five new window shutters and a front door shutter. The house being 41 years old needed a face lift. I also had them repair the front doorstep / sill. Family company that has a great crew and was able to complete everything in one day, I couldn't have been happier with the results and my wife is very happy to have all these repairs done. I highly recommend them and will use them in the future for other repairs"
5 neighbors recently requested a quote
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Doors FAQs, answered by experts

Professionals guarantee a secure fit, weatherproofing, and enhanced curb appeal.

While not strictly required, it is highly recommended to shim both sides of a door. Shimming both sides allows you to make minor adjustments for wall framing that isn't perfectly plumb, ensuring the door is level and hangs evenly. This practice helps the door swing open and close smoothly, reduces the chances of the frame warping, and can be used to center the door within the wall opening. If you are working alone, you may find it easier to remove the door slab to lighten the weight while supporting the frame and inserting the shims. With two people, the process is generally faster and easier, whether the slab is left in place or not.

Yes, you can add a door to your basement—it might even be required, depending on building codes in your area and whether or not you’re using the basement as a bedroom. A basement contractor can give you some advice on installation and help you add a door to your basement.

When choosing between an inward- or outward-swinging door, there’s no right answer. Inward-swinging doors are great for avoiding debris and keeping hinges inside for added security. Alternatively, outward-swinging doors can give you more space inside your home, and some homeowners feel they’re harder to force open. Ultimately, neither is “better,” but a door expert can help you figure out which fits your needs.

The average fiberglass door that you purchase from your local door company or home improvement store will last around 20 to 40 years, so fiberglass doors are considered durable compared to other door materials. When properly maintained, it's not unheard of for a fiberglass door to last up to 80 years.

The Mountainside, NJ homeowners’ guide to door services

From average costs to expert advice, get all the answers you need to get your job done.