Here is a list of other products and services we provide:


  • Custom duplication of almost any wood window sash no longer manufactured.
  • Historically correct profile matching for preservation or landmark status
  • Repairing all parts of windows: rotted bottom rails and stiles, broken muntin bars and glass.
  • Custom made wood storm windows and screens
  • Custom wood window grilles (colonial, diamond, prairie style, etc.)
  • We specialize in the repair or replacement of most aluminum clad wood sash including:
    • Biltbest
    • Rockwell
    • Sealrite
    • Lincoln
    • Eagle and Others.

    -We carry Kolbe & Kolbe, and Winstrom window product lines.
    -We also carry "Truth" brand window hardware (single and dual arm casement operators, replacement sash tracks, replacement hinges, sash locks, crank handles, etc...


  • Residential and architectural flush wood doors.
  • Unlimited hardware options for locksets, hinges, etc...
  • Unlimited shop capabilities including prehanging, custom jamb widths, custom heights

-We carry Simpson, Woodharbor, Easychange, Castlegate, and Winstrom Doors


You Are Only A Call Away from Solving
Your Damaged or Rotting Wood Window Sash Problems

Are you looking to replace or repair your wooden windows, or window hardware? Do you have moldy or rotten sash joints, bowed meeting rails or a broken sash?

This may be the most important letter you've ever read about your windows...

Here's why,

Hundreds of wood window units are removed from homes every year - with thousands of dollars being spent - Unnecessarily!

In most cases Accurate Custom Sash can save you money and allow you to keep the character and beauty of your current wood windows.

Since 1981 we have been known for duplicating complete wooden sashes or simply replacing rotting, cracked, split, or warped parts. From a bottom rail only - to a broken muntin bar - we do it all!

Don't replace your wood windows until you give us a call!

In most cases we can save you money by simply repairing the windows that you would have spent hundreds of dollars replacing!


From: Mark Sirvin, Wood Window Repair Consultant
Wednesday, 11:49am
Phone: (708) 423-0423

Dear Friend,

My name is Mark Sirvin. I and my wife Pat own Accurate Custom Sash & Mill Corp. We are a family run, custom window and door millshop. We pride ourselves on the highest quality customer service, workmanship and a personal touch. Our business mission statement is to provide each potential client with as much detailed information possible, so they can make the most informed decision before their purchase.

We will never subject any potential client to pressure sales tactics - PERIOD!

No product leaves our shop unless we are proud to showcase it in our own home.

I encourage you to give me a call at (708) 423-0423 and let my expertise guide you in making the best decision for your home.


Here are just a few of the things you could discover on 15 minute phone call with me:

  • How to save over $100 per window by having your wood windows repaired rather than replaced!
  • Discover how affordable custom duplication of wood sashes really is!
  • Preserve the original look of your wood windows!
  • Avoid warping, splitting, cracking vinyl windows... instead make your current wood windows more durable!
  • Learn how to make your wood windows last 10 to 15 years longer than average.
  • Discover how to avoid falling under the spell of the window replacement salesman. Let us help you sort through their claims.
  • Are your windows oddly sized or shaped? We can duplicate and repair any size and style of wood window.
  • Quickly locate any type of wood window hardware. We provide obscure and no longer manufactured replacement hinges, replacement operators, casement locks, and other hard to find window hardware!
  • Learn the secrets of effective repair and maintenance for sash, sills and frames. This insider information will add years to the life of your windows, and will put money in your pocket!
  • Save the character of your home by keeping the beauty of your current wood windows intact. Minor repairs may be all that are needed.

But don't take my word for it... read what my customers have to say:

I am a very satisfied repeat customer of Accurate Custom Sash. The professionalism and workmanship they provided is unmatched.

They took the time to layout and install a door opening that I was told could not be done. It was a pleasure to work with such a knowledgable and courteous staff.

I will certainly call again for any future work, and would highly recommend them.

Carole Dorian
Oak Lawn, Ilinois


We were so impressed with Accurate Custom's attention to detail, from the estimate... to the completion of the project.

We are very pleased with the results, and have received many compliments on the quality of craftsmanship, even from other tradespeople.

We look forward to working with the nice, professional people at Accurate Custom again!

Dan and Beth

Again, I encourage you to give me a call at (708) 423-0423 and let my expertise guide you in making the best decision for your home.

Mark Sirvin, Owner
Accurate Custom Sash
5516 W 110th St # 1,
Oak Lawn, IL 60453

Phone: (708) 423-0423