Building a dedicated listening room

@8th-note Your room sounds like a well-lived-in, well-loved audio space which is a big, non-quantifiable, aspect of its musicality. I like a room to look as if people live in it vs. a space that is antiseptically designed for one task that must be enjoyed in a certain aesthetic way.

My current room is the open-plan living room/kitchen area of our current home and it's not what anyone would consider audiophile-worthy. That's ok. Most of the time I'm playing music over the speakers as background music. There is furniture and all sorts of family stuff about. But it sounds better than my last space which was more isolated from the house. My wife likes listening to music as background music and can't wait for me to have my own space for my books and music. Primarily so she doesn't have to look at it. So I'll wire the house with wi-fi speakers for streaming background/wallpaper.  And my space will be where I'll spend some time on dialing things in but, like you, will take a laid-back approach to "treatment" because ultimately I want to spend my time listening and enjoying music vs. spending my gray years tinkering with the room. 

I’ve built multiple dedicated audio rooms in my latest custom houses. The best room was a room inside another room to get the ideal dimensions. The whole house had closed cell spray foam insulation (the attic in the south during the summers never got above 70 degrees), and the room within a room had acoustic insulation in its walls. Had 4-20 amp runs put in the room. The ceiling was 2” thick cedar tongue and groove. Door was behind the listening chair. Still incorporated audio panels and diffusers in the room from ATC and GIK. Speakers were 9’ out from the front wall and the listening chair was about 9’ from the wall behind it, and 9’ from the speakers to the chair. 

Once you figure out the room, learn REW.

OP,

In a similar situation as you are, building a dedicated listening room....unfortunately mine will be on a tight budget. Some suggestions, many of which you've already considered.

(1) Power is crucial, you are already know this.....I would recommend using high quality receptacles like Furutech GTX-D(G - Gold), Furutech DTX-D(R - Rhodium), or Oyaide R1.

(2) If you are going to stream, make sure you have a high quality ethernet or mesh system that you can connect a streamer into via an ethernet cable

(3) Reach out to GIK Acoustics (Mike Majors is a really helpful designer), their assistance and software has been really helpful. The one thing he highly recommended is to not overly deaden the room, it's hard to overcome this failing.

(4) I'm using hardwood floors with area rugs to "tune" the room, has been recommended to use thick tight weave wool rugs

(5) When placing receptacles, think about how your cables will lay in relation to signal cables, speaker cables, and power cords; so you can keep crossovers to a minimum.

Good luck on the build, sounds like you're starting from a great place!