Do I need a TM30 form if I'm staying in a hotel or just in an apartment?

ALWAYS !

If you stay in a hotel then the hotel manager will make one. If you stay in an apartment or condo or house, then the landlord should produce one.

no

I've just moved house and the owner did a tm30 online but I had to also go immigration and fill in a tm28 and give them with copy's of passport and home contract

Why would you be concerned about a TM30? I have been to Thailand more than 20 times and never seen one or touched one.

What is a TM30?

When I sign in at a hotel or apartment, I ask the reception for a copy of the TM30, then it is practicaly no extra work for them to print it out, when they file it.

(perhaps a little tip, when I get the copy)

Much easier for them, than comming 3 ½ to 7 weeks later, and they have to search through papers to make a copy.

yes

You don't need a TM30 unless you are going to immigration. If you won't be going to immigration then don't worry about it.

Otherwise, it's a legal requirement regardless of where you are staying. EVERY property owner in Thailand is legally required to report a foreigner staying at their property within 24 hours of arrival.

Yes

If you are staying in a hotel in Thailand, the hotel is responsible for submitting the TM30 form on your behalf, as they are required to report foreign guests’ stays to immigration. However, if you’re staying in a private apartment, condo, or house, the landlord or property owner is required to file the TM30 to notify immigration of your stay.

In either case, the TM30 is necessary, but the responsibility for filing it differs depending on the type of accommodation. It’s a good idea to check with your accommodation provider to ensure the TM30 is properly submitted.

No they want it even if you are with friends/family I believe.