Really your architect friend does not have this ability? . IMO you need an architect what do you propose to get out of a deisgn tool you have never used . IMO you go to an arcjticet with your want and need lists and go from there this is too big a job to do alone unless you have mega skills . You might get lucky and find a good interior designer with the skills to do this if your friend in not able .

The OP is simply looking to identify a tool. He already knows an architect, and would use him/her if appropriate. Pay more attention to those who give actual advice than those who just give their opinion.

I am sorry but her architect told them to look at a remodelling program on Houzz how is my answer wrong. What kind of architect sends a client to some tool they have no clue about.

They aren't a client, they're friends! And they probably don't want to jeopardize that relationship.

IMO then they should look for another architect not so DIY design program that IMO usually take weeks to figure out at best.I am freinds with lots of my clients I have no problem seperating the 2 one is business.

Am not aware that Houzz has such a tool.

There isn't a tool on houzz. I did find this link; hoping it is what you want.

https://www.thespruce.com/free-online-room-design-applications-1357750

what kind of remodeling are you wanting to do? inside? outside? architectural ?

Houzz Pro has some tools

https://www.houzz.com/for-pros/software-kitchen-bath-remodeler

or, this one

https://www.houzz.com/magazine/introducing-the-houzz-pro-room-measurement-tool-for-designers-stsetivw-vs~137625260

I think it is an excellent idea ..if you have the time and skills to figure out how to use the app elcieg suggests…it is a fun way to learn about the whole process a little better….to learn to think thru or establish what will or won’t work for you…but it is rare that it can successfully substitute for getting a pro …