A soft white or light cream.

I'd also stay away from grey - go with a neutral cream.

If you can , go pick up some poster boards and some samples of your top picks tomorrow morning Paint the boards and move them around at different places in the house. That will give you a much better idea than pics in different houses off the internet.

Grays can pull a big surprise undertone in a north facing house, especially in a wooded area. Spend tomorrow buying samples and testing them in the house. There is no magic answer to this, each house has its own lighting and surroundings. A full house paint job is expensive, don't rush into this.

Thank you! It's a big decision and I do feel rushed.

We are very happy with grey owl. Super neutral and easy

Not the question you asked, but which Benjamin Moore paint line is he planning to use?

Yeah, the timeline is unfortunate. The right paint color depends on your furnishings and lighting (both natural and not). A soft white goes with everything and is a classic look.

IMO this is a much more neutral color than any gray or beige or even white . I always use this when builders are pushing for wall color . I sometimes cut it even up to 25% if you just want a hint of color

I suggest White Down, OC-131, which is a creamy off-white with a hint of gray.

I really like the barely there. I think it is a nice neutral. We are considering BM Balboa Mist which is similar but a little darker I think.

Yes! It looks very similar just with a lower LRV. Just hoping Barely There doesn’t have any surprise undertones

Barely There has a green undertone. You need to do a sample to find out if this is going to be perceptible and/or undesirable in your house.

Who died and made your builder the boss? You're the boss because you're the client. Don't let him bully you into a rash decision you don't feel good about and may regret. If you can't reason with your builder, go to his boss, or if he's the final word, tell him you need a good 4 or 5 days to decide on a color. Bullies often back down when called out. But if he doesn't, then I suggest you make the most CONSERVATIVE decision regarding the color you can. It's much less likely to haunt you than a statement color would.

Bold advise without knowing anything. What kind of build is this? Was the homeowner given time and they didn’t decide? Was this rare known? And so on…

And these days if the painters got an unexpected opening in their schedule, the builder would be a fool not to take it, which might be the reason for rushing the paint decision.

BM Classic Gray is nice, but yes, it could come off a bit cool in some rooms. Another color to consider is BM Wind's Breath.

Thank you everyone for commenting and offering advice! These are new builders. They’re doing a fantastic job (we have walked through after each step and they are clearly hiring skilled contractors); however, their process in terms of communication with us is not smooth yet. Definitely frustrating at times, but we will have a beautiful and well built house at the end of this despite some short notice on finish choices! Also a very good point about availability of painters…or anyone else. We have been delayed several times because of Covid and supply chain issues, etc.

Try BM Soft Chamois - we have it in our house except for the bedrooms. Looks different though in different rooms and at different times so you will need to test it,

OP, what stage is your house build? It's surprising that you feel rushed. We had colors selected before the architect finished. LOL.

I had good luck with Behr ”Weathered White” (don't use their paint - just the color) it doesn't give weird undertones in the changing light. Warm, but neutral. We have the same natural light issues and I needed something with a hint of grey, but still bright enough to cope with our low light in the back of the house. It is a great choice. White without that that stark feel. Just a mellow kind of greyish white.

This is the related slightly darker color we used in adjacent rooms on the sunny side of the house.

They blend and hardly noticable that there are two different colors. It balances the light in the house well.