Just because you're renting doesn't mean it's not your home. Can a landlord put a limit on the amount of times you can have someone stay over, how many visitors you can have because it'll affect wear and tear?
Yes he can, but it would have to be in the terms of contract.
reasonable to expect to be allowed to have 1 person per single and 2 people per double room without it adversely affecting wear and tear?
That would depend on the people, the landlord has a right to look for siutable tenants.
2 double rooms mean it was built to accomodate 4 people and I wouldn't think it unreasonable to put 4 people in there without the landlord being able to up the rent
That would depend on if there were allowances made for the fact that only 2 people were renting.
I suppose the question now is, can a landlord give permission for additional licencees renege on this verbal agreement?
Not worth the paper its written on I would say.
The fact that in this case the property is registered with the PRTB and says that it is suitable for 4 people would mean he has no grounds for denying the extra people here.
Of course he has grounds for refusal. So far we know nothing about the other two and are they dependable, good character etc. All we know is that the apartment has 4 bed spaces, but does it have adequate common living space 2 bathrooms etc that a doubling in tenants could bring about. As this is in its infancy the tenant should either renegotiate terms or move on cause the whole set up seems to be a bit of a shambles.