Do you mean making the change for resale value, or for your family to live in?

I think it would depend on the specific layout.

Are you on a septic system? They are installed on number of bedrooms.

@Toronto Veterinarian for our family but don’t want to hurt resale value.

@eandhl2 we are not on septic

It's hard to endorse without seeing a proposed floorplan. Also, consulting with an established real estate agent in your area might be a good idea.

You might pay more property tax for the extra bedroom, check with your town.