I have a new home we just moved into with Andersonn 200 double hung and Anderson 400 casement series windows. We built a custom high end home.
When measuring for blinds we noticed that the casing on the double hung windows only extended out from the Anderson frame by 1/4 inch. The Anderson frame is 1 1/4 inches. The builder said this is the way Anderson windows are hung and we will need to hang outside the frame blinds.True or false??

We are having the same issue. Did you ever get a solution...I have the same problem. I called Anderson this morning to see if I could hang blinds as an inside mount...even if it stuck out a little. They said mounting anything inside would void the warranty. But I have beautiful crown moulding that I don't want to cover up...HELP!!!!!

Well make that 3 of us. We have the same problem with the double hung windows. No room for the blinds. Blind company says mount on the moulding.

On the casements narrow blinds will fit on the inside molding. For the double hungs, the installer suggested that I buy a firring strip and install it to the wall above the molding and attach the blinds to that.

Thanks for the hint. After requesting suggestions from the company they sent the warranty and warned about installing anything near the balancer. Felt like they were more interested in warning about violating the warranty agreeement than about helping.

For brand new windows, these things don't work all that great anyway. I'd suggest a different brand to someone else.

My husband and I are confronting the very same problem. Brand new, custom home. We're EXTREMELY unhappy with the Series 400 windows. The sales pitch was great, the Andersen windows we had in 2 prior homes were fine. These don't open with the ease of the others. We had to drill the frames ourselves to get the grilles to seat properly. Two double hung and one casement were defective from the manufacturer, and are still awaiting replacement. And now we confront the "can't hang blinds inside the molding problem". And, voided warranty or not, you won't hang blinds inside the double hung Series 400 unless you have 6" walls. That's something the salesperson should have told us.

Never again. "Andersen windows" has become synonymous with the word JUNK for us.