What is the trim you are considering? A picture would help. No one really notices different trim in different rooms if they are all white.

Something more along the lines of the one on the left. The style on the right is pretty much what we have now. (Trim and baseboard.) I was even wondering if I could just replace the header but leave the sides? Add a piece to the outside of the existing trim to make it bolder? Or do all the doors but not the windows? Below is all of our interior doors and trim now.

@tozmo1, when you say it was expensive what ballpark are we talking? And did you use pre-primed boards, real wood, or something else?

@Kathleen Cox - Very pretty. I like the proposed door trim. Honestly, you can do the doors and not the windows. That's what I did. I redid the trim in my master and did the baseboard and doors and left the windows as is. They have drapes on them so no one notices. Did the same in the family room. Doors and baseboard and left the windows alone. You also don't have to do everything now. You can go room by room, however, the painting is labor intensive and if you're going to change it out later on you may just want to wait.

@Design Girl Do you have any thoughts on leaving the sides but adding that header and baseboard? I wouldn’t mind replacing the sides but I am going to run into light switch clearance issues, and I really don’t want to have to move the wiring!

Maybe do a little research before making any decisions, https://www.thriftbooks.com/ has lot of inexpensive books on trim-work to help answer your questions.

HI, I used unpainted wood, the kind intended to be painted, not stained. The trim is sold by the linear foot. It's amazing how much trim there is in a room once you start adding it up, especially when you are doing doors and windows. In my case it was several hundred dollars a room just to buy the trim. If you're adding quarter round, that's even more. So if you're doing an entire house, that could be several thousand dollars, just for the trim.

Is this a DIY project? I did mine myself but I had good tools including a trim nailer. If you are doing DIY and you don't have a nailer, this will be a long and frustrating project. Trim work is an exacting job to ensure it looks good. Is there wall to wall carpet in any of the rooms? That add another complexity if there is.

I would do one area really well, paint the rest of the existing trim and then see how you like it.

Try a header with the existing trim. If you don't like it, remove it. I picked up some headers very inexpensively at my local Habitat Reuse Center. I was going to do exactly what you're thinking of, but decided to renovate my kitchen instead. I still have them in a closet. If you're in North Carolina, I can fix you up with headers for free!

@tozmo1 thanks for the info! I wish I lived in NC, my husband actually grew up there but we live in ND now. Fortunately I am the ‘fixer’ in the house and have done just about everything from hanging and mudding drywall to electrical to building furniture, so I am not worried about installation. 😊 I am actually an artist by trade, so am thinking I can make this work, I just wish there were more examples I could find of mixing styles. To save some money, I am considering doing something like what this women did in this video ( https://youtu.be/4K4sll21o3M ), and then just putting in new baseboards. I was also hoping to rebuild the windows to include aprons but I think that is out of my budget at this time. I guess I am still just a little concerned about bulking up the colonial trim when so much of the house is Craftsman, but at the same time, I am kind of already getting sick of all the Craftsman style trim everyone is making tutorials about, so perhaps it will make thinks more interesting.

I wouldn't do the header unless you changed out the sides as well. The two don't marry well together.

@Design Girl I don’t know, I kind of like something like what I found below, especially if I add an extra piece to the existing sides to bulk them up a bit.

Well, if you like it then do it. To me it doesn't go and looks very top heavy.

@Kathleen Cox Sounds like you're ready! I watched some of the video and I agree, adding another trim piece to the doors will probably work. You should try it in a room that isn't totally open to the whole house and see how it looks with the larger trim and header. I definitely recommend getting/renting a nailer if you do a big trim project and don't already have one. Pounding those little nails close to the floor is a nightmare! Post pictures when you're done.

@tozmo1, ha thanks! Fortunately I already have one. Yeah, I guess I should just do a test section and see how I feel about it.