They make a big difference, but MUST go all the way around all sides. MUST MUST MUST.

Yes, they should go everywhere.

Show pictures of your house front and sides for the best suggestions.

Frieze boards also serve a practical purpose of closing up gaps and strengthening the soffits.

But if you've got raccoons on the prowl, at the least, cover it all or back it up with hardware cloth.

Architect drew our plans with it only on the front and I’m afraid to ask our builder for a price to add them all around because he has less than fair on several things.

If your "architect" represents themself as an architect, verify their license with your state.

Why would you not ask? Get the information you need to make a decision and for us to help.

Ask now or regret it later. IMO mostly decorative now so do you want them or not .If yes then bite the bullet and put them all around or if not then they look cheap stuck on for n purpose.

I kept my house design quite simple, but whatever details I did add, they were added all the way around the house.

I just did my morning walk around the neighborhood and way too many houses with molding and trim just stuck on the front of the house. You can clearly see the sides of most houses too and it just looks unfinished, like you only applied full makeup to half of your face!