I’m more on the side of your strata committee – there isn’t a lot that can be done in a practical sense to solve this problem. But there are some things you can do to improve matters.
Firstly, you haven’t mentioned your by-laws… What do they say about this problem? There should be a detailed by-law in place setting out the parameters that govern your visitors parking spots. Is there a definition of “visitor”? How long may a visitor park? Can residents use these spots – or in other words, are residents clearly prohibited from parking in these bays and on the common property? You mention that workers to the residents are parking there – they might be considered a bona-fide “visitors” – especially if you don’t have a clear-cut definition of that in your by-laws.
So, I’d suggest your first step should be to review your by-laws and then, if necessary, suggest editing them to make the problematic parking clearly a breach of them. You might want to suggest suitable changes, and submit a motion for your next General meeting, to update your by-laws. Note that this will cost your building money.
Secondly, you say that you’ve asked the strata committee to fix the problem… What do you expect them to do?
They can basically only do two things – issue a breach of by-law notice to any resident or owner who is actually, and clearly breaching a by-law – hence my first point above.
Otherwise, they can put in place some physical means of managing your visitors parking spaces. Such as a boom gate, CC TV cameras, bollards, chains, signage etc. This will all cost money, maybe a lot, for just 6 Units… So you need to get the other owners on side if you want to proceed in this direction. They need to convince them that this is a problem that can be fixed, (which you indicated may not be easy), and they need to then decide to spend the money.
The suggestion about getting your local council to fine people is basically a non-starter. My strata committee approached our local council about this, but they aren’t interested in getting involved. I’ve asked around, and as far as I can tell, no council is doing this, apart from in special cases, where certain large commercial buildings have public parking bays. Even so, they would require the right signage to be displayed, etc, which will cost money. And council inspectors cannot determine who are visitors and who are not – they can police people overstaying the time limits, but that doesn’t seem to be your problem, and you may not have this specified in your by-laws, anyway.
So, have a big think, and rather than focus on the problem, you need to focus on a practical solution, and then work to bring this about…