Don’t think that is correct, I know other brands allow this.

Then go for the other brands to allow what you want, The companies mostly recommend what they find easily and conveniently.

Thanks! Any recommendations on other brands? We had been deferring to the GC on windows since we have no experience with this part of the project.

I would double check with your contractor first and even Marvin. Pretty sure Anderson Will do it .

Marvin will do the split finish on cladding vs trim.

Agree with millworkman but clad casing offerings are limited and chances of matching are not good. Do you have a close-up detail available that you can share?

Here's a picture of the double hung to be replaced--excuse the dried out garden in the reflection! Also, I realize I used the word casement incorrectly in part of the original post--I'll edit it now to be more accurate.

Thanks for all this. East Bay 10, that's exactly what I thought. We've reached out to our contractor to figure out why he's suggesting otherwise... or if there's been some email miscommunication.