It also depends on what you want to use the room for, and who/how many people will be using it at one time. How does the room relate to the adjacent rooms?

This is a question only you can answer . How many people use the room every day? Is there TV in there ? Do you have a FP If you really want help you need to post a to scale floor plan of not just the LR but the whole main living space.

I would say NO it's not. But we would need to know total square footage of house as well as the number of bedrooms.

Yes. Many people have much less.

With windows on 3 sides furniture placement might be tricky and the effective space may be smaller. But I think it would probably be fine and I wouldn’t give up the windows. A floor plan and information about the size of the house could help

Thank you all for your comments. This is my first post on Houzz and I’ve been figuring out how to post a picture of the downstairs plan.

Each square is 2’ x 2’

Can you add a few feet to the right side of the house? That would solve a lot of problems.

Thank you Diana, can you tell me why I should add a few feet to the right of the house? What problems do you for see?

Dianne, do you for see 16 x 16 living room being not as good as 16 x 18?

Is the only entrance for the Den through the pantry? That seems very odd to me (but I'm in England)

@Celyse Mclaren, adding a few feet will make both the living and dining rooms a better size. A 13' x 13' dining room will accommodate more guests than a 10'x10' one. And a 16' living room is not going to serve you well when you have guests either. My suggestion is to try to arrange furniture in your current configuration. You'll see that you will be cramped. If you are building the house and have the option to make these rooms larger, it will serve you better.

Thank you Diana. I will try that.