Landing in Canada
When you "land" in Canada and activate your permanent residence (PR) status, you have the option of applying for a PR card right there at your port of entry (POE). In order to do that, you need to be able to supply the Immigration Officer (IO) with a mailing address in Canada.
It's fine for this address to be the address of a friend or family member - it doesn't matter, as long as it's a Canadian address.
If you don't have any address to use then you can still do the application, but will have to notify CIC at a later date with a Canadian address to receive the card.
PR cards cannot be sent to PO boxes.
 Canadian address not yet available
If you do not yet have a mailing address in Canada, but if you have a relative or friend in Canada who is willing to forward your PR card to you, you can provide the address of the relative or friend.
If you do not have an address to which the PR card can be mailed, it does not matter. If you did not have an address in Canada when you applied for the PR card, but do before receiving it, you can input this new address on CIC's website here. (this can also be used, if you move after you gave your address to CIC with your application for a PR card.)
Again, PR cards cannot be sent to PO boxes.
 Time window for free PR card
- You have six months in which to supply an address to which a free PR card can be mailed.
- If you apply for a PR card outside of the six month window during which you are entitled to a free card, you will need to pay a fee of $50.
- Outside of the six month window, you will need to pick up your new card in person at your local Citizenship and Immigration Canada (CIC) office. You will receive a notice in the mail telling you the card is ready to be collected.
 What you need to know about eTAs, PR Cards, and PR Travel Documents
If you "landed" in Canada to activate your PR status, returned to the UK to settle up your affairs, and now are returning to Canada to live, but have not yet applied for or received a PR card, you are going to run into some problems.
From 15 March 2016, an eTA is required for anyone who enters Canada who is neither a Canadian citizen nor a Canadian PR. The scenarios below will hep you work out what you need to enter Canada.
eTAs are only required for border crossings at an airport, NOT border crossings by car. So you can avoid the eTA requirement if you are driving into Canada from the USA.
 Scenario 1: I have a COPR document, but have not yet landed.
Until you actually LAND in Canada, you are not a PR of Canada, and therefore you need an eTA before travelling to Canada. The airline will not board you without this eTA - the COPR document is NOT conclusive proof that you will be allowed into Canada. So until you actually become a PR, you need to have an eTA to board the plane.
 Scenario 2: I have landed, but have not yet received my PR card.
You are not able to apply for an eTA because Canadian PRs are not allowed to apply for eTA. However, the airline will not board you without proof that you are a PR, and the only proof they will accept is either a PR card or a PR Travel Document (PRTD). So if you are landing in Canada without a PR Card, you have to apply for a PRTD: http://www.cic.gc.ca/english/information/applications/travel.asp . Be sure to allow adequate time for processing!!!
 Scenario 3: I have landed and I have a PR card.
Just make sure you have the card with you and you are good to go.
 Renewal of PR card
In order to maintain your PR status, you have to accumulate 730 days (approximately 2 years) inside of Canada in a 5 year period (or 730 days living abroad with your Canadian spouse).
PR cards are valid for five years from the date they are issued.
Your PR card will have an expiry date on it, and that date is 5 years from the date the card was printed.
It is important to note, though, that the expiry date on the card is NOT the same as the deadline for your 5 years' residency requirement. The 5 year requirement for residency begins on the day that you land, NOT on the day that your card was printed.
For example, say you landed on 20 April 2014.
Roughly two months later you receive your PR card with an expiry date of 15 June 2019.
You have until 19 April 2019 to accumulate your 730 days inside Canada. The fact that the card is valid until 15 June 2019 is completely irrelevant to your residency requirement.
When your PR card expires (or is about to expire), you need to apply for a new one. When you apply for a new PR card, you have to demonstrate that you have met your PR residency obligations.
New PR cards have to becollected from your nearest CIC office. You will receive a notice in the mail telling you the card is ready to be collected.
 More information