Rotten Wood Window Repair for Sills, Sashes and Frames

MOST COMPANIES REPLACE – WE RESTORE WHAT STILL HAS LIFE!

Rotten wooden window sill, sash or frame? Rotten Window Repair company is your window surgeon!

40+ service areas across Chicagoland | 10+ years of experience | We save what others replace | 10‑year warranty on all woodwork | Honest pricing without hidden surcharge

4.9

Why rotten window repair:

Why Rotten Wood Repair Matters

Structural Risks

Rotten wood is a weak point of window construction. It leads to jammed sashes, warped frames, and in severe cases, the glass can become unstable.

Energy Loss

Poor insulation = higher energy bills every single month.

Growth Of Mold

Moisture penetration = quick mold spreading that causes damaging of surrounding materials and lowering indoor air quality.

Aesthetic Issues

Rotten wood ruins the appearance of your windows: peeling paint, soft spots, cracks, and dark stains.

Why Replace The Whole Window When We Can Repair Rotten Wood Part

We fix the real causes of your window problem

Signs that you need rotten window repair help:

SOFT WOOD

WOOD DISCOLORATION

SHIFTED AND DISLOCATED ELEMENTS

MOLD GROWTH

Thousands of happy clients across 40+ service areas

Testimonials

Rotten Window Repair- Window Repair Company

4.9

Based on 60 reviews

review us on

Tom Brzyski

15:36 13 Feb 26

Absolutely fantastic service. They replaced one of my cracked, custom shaped windows. Easy and quick process from quoting to installation. No pushy sales tactics like I have received in the past from other installers. Also, a fantastic crew doing the installation. Will definitely use again and recommend to anyone.

Tim

18:35 05 Feb 26

These guys were absolutely great to work with replacing a bunch of different windows throughout my house including my sliding door. Very professional and friendly during the entire process. Affordable as well! Will definitely use them again in the future cause they were the absolute best!

Kelli Wasielewski

00:50 29 Jan 26

Exceptional service! The repair of our windows was seamless from start to finish! From the quote appointment to the repair appointment! Professional and knowledgeable repair men! They even cleaned up after themselves! Thank you so much! Highly recommend!!

Joseph Fluder

19:55 27 Jan 26

Extremely responsive, good technician, and fair price. I appreciate the support in a pinch.

Jennifer Vojvoda

16:57 15 Jan 26

Had a good experience with this company. They got us an appointment in 2 days and were able to replace the glass in our window in a hour. The price was reasonable too.

Samantha Rutyna

20:16 10 Jan 26

Rotten Window Repair did an excellent job repairing my basement window. High quality workers, and very fair pricing. Excellent costumer service. I would recommend this company to others and I would use them again myself.

Ramie Hamdan

19:22 04 Dec 25

professional, clean, and timely. did a great job repairing my sash I would highly recommend them.

Ambrie Gordon-Carroll

18:24 04 Nov 25

Great work!

Debbie Grzonka

10:09 04 Oct 25

I love Tony and his crew. They are very honest and pleasant to work with. Awesome job and knowledgeable of windows and fixing them to look new. Saved lots of money and got to the root of the problem. Yes the windows were bad, but insulation of the home is my main problem. Thank you Tony and and crew. Love my new repaired windows. They all open and close. Now.

Mike Baron

20:56 15 Apr 25

I highly recommend this company. Quick response to initial request and they came out and quoted the same day. Work was completed ahead of schedule and very well done and clean. Great job.

Anthony Alsip

22:25 10 Mar 25

These guys are amazing the work that was completed was beyond my expectations. The professionalism and explanation that they offer and have is hands down the best I have had with a window company. Thank you guys so much for your hard work and dedication to the job

Completed projects

FAQ

What causes wood rot in window frames?

Wood rot develops when moisture penetrates the wood fibers. This usually happens due to damaged paint, poor sealing, condensation, or long‑term exposure to rain and humidity. Once moisture gets inside, the wood begins to soften, darken, and lose its structural strength.

Is it better to repair rotten wood or replace the entire window?

Repair is usually the smarter choice because it is up to 4x cheaper, preserves the original architectural style, and requires far less construction work. We recommend full window replacement only as a last resort.

Is the rotten wood repair durable?

With proper materials and sealing, restored wood is strong, moisture‑resistant, and long‑lasting. Rotten Window Repair Company provides a 10‑year warranty.

Will the repaired area look like new?

Professional restoration blends seamlessly with the existing window construction. After repair, sanding, and painting, the window looks uniform, clean, and structurally solid.

Will the repair improve energy efficiency?

Absolutely. Rotten wood breaks the insulation barrier, causing drafts and heat loss. Repair restores the frame’s integrity, reduces air leakage, and helps lower energy bills.

Is the process messy?

Minimal mess. Technicians work with precision tools, protect surrounding areas, and clean up fully after the job. Compared to full replacement, the difference is dramatic.

Need your rotten wood window repaired?

Get in touch with us for a free, no-obligation quote. We respond to all

inquiries within 30 minutes during business hours.

Hours of Operation:

Order Now and Get a 10% Discount!

Repair and Save Money with Rotten Window Repair! We only recommend replacement when necessary, offering cost-effective solutions.