There is currently a bug with The Sims 4 Snowy Escape Expansion Pack. The lot that Lilsimsie designed was supposed to be a starter home, but something changed and the price is now $20,248.
A single Sim moving into a home for the first time only has $20,000. This makes it impossible to afford this lot unless you either have more than one sim, or you use cheats. You can use the following cheats
- testingcheats true
- freerealestate on
This will allow you to move into any lot regardless of lot value. It’s not ideal, but until this gets resolved it’s the only things you can do.