In light of the current global situation, the Singapore government last week issued a mandatory 14-day stay home notice for people returning to Singapore from other ASEAN countries, Japan, Switzerland or the UK effective 16th March 2020, 11:59PM. Only a few days later, the government expanded its scope and made it mandatory for residents returning from ANY country to stay home for 14 days.
I was in another ASEAN country when I first heard about the stay-home notice affecting returnees from ASEAN countries. Although there was a bit of a grace period, I could not return to Singapore prior to it kicking in as I was overseas due to an urgent personal matter. I eventually returned to Singapore on the 19th March, days after the restriction kicked in.
Update: As of 18th June 2020, there are now slightly different variations of the stay-home notice which depend on (a) which country you come from and (b) your residency status in Singapore.
If you are arriving from these countries: Australia, Brunei, Vietnam, New Zealand, China (including Hong Kong and Macao), Taiwan, Japan and South Korea – you can serve your stay-home notice at your place of residence regardless whether you are a Singaporean/PR or a Long-Term Pass Holder. If you are a Long-Term Pass Holder, you should also possess a valid approval letter for entry into Singapore. In addition to the stay-home notice, all arriving passengers must also do a covid-19 test before the SHN ends and this is chargeable (S$200, regardless of residency status).
If you are arriving from a country other than what is mentioned in the preceding paragraph, then you can only do your stay-home notice in an approved facility. If you are Singaporean/PR, this is not chargeable if you last left Singapore prior to the 27th May 2020 travel advisory (chargeable at S$2,000 if you left Singapore after the travel advisory). If you are a Long-Term Pass Holder with valid approval letter to enter Singapore, the stay-home notice in a facility is also chargeable (S$2,000). Again, the covid-19 test is also required and is chargeable regardless of residency status.