Hard to say without knowing what furniture layout options you are ok with. TV sets above fireplaces have almost become a default location despite the fact that that's a poor choice, both design-wise and ergonomically. The midpoint of the TV should approximately align with your eye level in a sitting position. If it's substantially higher, you're watching TV with your neck craned up. Unless you have no other options, or you have a low, minimalist fireplace, like a linear one, please consider an alternate location. As much as I like my big screen TV, I don't want it dominating the room, or giving me a sore neck.

I'd be more concerned about the awkward entrance into the master bedroom.

Thank you. The designer’s first sketch showed furniture arrangement like this. I’m not sure if this is to scale. But the sofa is forward where the TV would be on the side. Pushing the sofa back wouldn’t work because you need to be able to walk behind there from the entry.

There is a lot of circulation space in that living room, 462 square feet to seat seven people.

Sorry not following. Everything is up for consideration as I’m trying to gather final changes to be made to the plan.

Where’s the lake? Hopefully within view of the living room. We like being able to sit on the sofa to watch TV and see the lake at the same time. I would place the TV in the corner, (thin red line) which may mean a redesign of that area.

Everything outside the red rectangle in the living room is circulation space. Is there a compelling reason for the angled walls?

Dining room is at an angle so that we can get that area closer to the lake and nest views and also get the living room closer to the lake. Basically it’s about maximizing views. The adjacent lot does not have a house and we feel like we need to get close or else we will loose even more view when they build there.

I would eliminate the window (or door?) to the Outdoor Deck that is next to the fireplace and build shelving there that could hold a tv on an articulating arm. It could then recess flat or be pulled out at an angle when in use.

I looked briefly at those brackets but the problem being for us we hardly use the fireplace and so the TV would be extended most of the time, and it looks worse that way. Why have something that looks worse when it's in the most common configuration.

We have the same situation in our new family room being built. I browsed a lot of pics on Houzz of TVs alongside the fireplace and while I liked a few of them my wife felt they all looked odd. So we ended up with TV above a linear fireplace. It's still higher than I would like but our couches are far enough back that neck strain shouldn't be too much of a problem (I hope!).

Then don't build a fireplace?

It is interesting to me that we have a design trend of TV over fireplace that is widely known to be terrible for watching TV (unless I guess you are a chiropractor) and yet it has persisted for so long.

We do it to be able to have a place for Santa Claus to come down or stare at a fire - something that we don't need anymore.

I would suggest you consider the number of hours per year that you have a fire running vs tv running.

Full disclosure - I have a fireplace. Built in a very traditional area. But the TV is not above it, nor to the side of it.

When I was trying to look at alternatives, I realized that your primary back door opens to uncovered space despite a covered patio. So letting the dog out during rain or going to sip wine outdoors during a rain storm becomes no fun. Not to mention, you exit stage left instead of going right outside. Because, I think you know that wall isn't going to be open very much. I can't think of too many lakes without mosquitos near by (maybe you are out West but then you have to wonder if the lake has any water in it...). The Master bedroom wall is an even stranger design feature - make sure you have a way to cover it. Should absolutely be electrified and make sure partial open situations are acceptable.

We faced a very similar issue w/ our LR. We did ours beside the FP and had a custom furniture made for it. Our architect originally had a much wider opening to the dining room (your foyer) and we narrowed it down twice and glad we did.

FWIW, we use our FP a couple of days per week (or more) throughout winter but even if we only used it for Thanksgiving and Christmas I'd still want it.

Another angle:

Is this lake house only to be used in the summer? If so, I would eliminate the FP altogether and put the TV there.

No, we would use it year around. Different experience in the winter but still a nice, scenic escape.

We have ours above the fireplace and love it. Make sure your mantle and fireplace are low and the fireplace insert is wider than your tv and enjoy.

There is no way I would delete doors to porch on a lakefront property. I assume the whole reason for lakefront is to open doors and enjoy outside etc.

This is the mock up of our fireplace wall. And in real life. We fully regret not realizing the tv was wider than insert but hindsight is 20/20. Sorry it’s a Christmas pic!

This is the plan.