I played TS1, then TS2 and eventually TS3. But I started having issues with my TS3 so the release of the Sims 2 Ultimate Collection shoved me right back into TS2. There's one thing from TS3 I miss though: the ability to make a tiny house (like a 10x10 house) but then move it into a bigger lot (like 20x20) if somewhere in the future I decided that house would need to have been built on a bigger lot since my sims now have had children and I'm really craving an outdoor swing I currently have no room for.

On TS2, there's no way to move a house to a bigger lot, you need to rebuild the whole thing. So, I was browsing the web for solutions to my problem and found several pages talking about this "biggerlotexpander on/off" code. The idea is that you open the cheat console (ctrl+shif+c), type in "biggerlotexpander on" and the hold your right mouse button at one of the lot's extremities and then drag it on the direction you wish to expand the lot to. Supposedly, with this cheat you can make your lot as big as you want.

Except that, just like another person, the code wouldn't work for me. I'd get a "ERROR TSCheatSystem: ERROR IN CHEAT: Unknown command in command 'biggerlotexpander on'. OnErrorClearParserTempState called. with command biggerlotexpander on .\source\TSCheatSystem.cpp(68)" message. And yet, I did find several sites mentioning this cheat, all explaining how to use it.

So I decided to try something else and typed "boolprop biggerlotexpander on" instead. No more error message. The code seemed to have worked. Except for the fact that, although I no longer get an error message, I still don't seem to be able to change the size of my lot. Has anyone ever used this cheat before?

Never heard of that cheat, but what you want to use is Lot Adjust by Mootilda.

The largest lot size you can have in Sims 2 is 6x6, this is hard coded and Mootilda's Lot Adjuster will do this for you.

http://www.modthesims.info/download.php?t=384656

As far as I know this is the only program/cheat you can use to make lots bigger.