Expiry of work visa

[LittleCamel]

I have 2 questions here.
First, my visa expiring on 27th April and IF i have an offer only on the 22nd April, is it still possible to apply for the extension/work visa? I mean is the timing an issue here.
Second, if I do not want to accept the offer, can I use the letter of offer to extend my stay?

Please advise!!
Thank you very much!

Job offer letters can not be regarded or treated like an employment contract you need for the visa application or extension. As you already mentioned it, job offers can be rejected or taken back by both parties applicant and hiring company at any time.
For your working visa application you need a company/employer ready to sponsor you.

[beeeie]

I really don't know because I was fortunate enough not to be in this situation (only one job change before I got PR and that was lined up before I left the previous job and I had 9 months left on my visa.

But my guess is that if you have made an application for transfer of sponsor before 27th April (and you have provided all the necessary paperwork, including the letters etc from your potential new employer) then they would grant you an extension whilst they process it. But I really can't be sure - only ImmD themselves can give you the definitive answer.

Thanks PDLM. Since my old employer has informed the Immg Dept about my resignation, does the new employer needs to fill in the "employment transfer" form since I am not employed anymore by the old company? (Btw, I can't see any such form from the Immg website.) Does the new company needs to submit all relevant documents again to apply for a new visa? or is it just updating the record?
I was vaguely told that I/new employer need to fill up the Explanatory Notes for Applications for Employment (Form ID428B) and Application for an Extension of Stay (Form ID91). Is it true? or there are more forms to fill in?

[PDLM]

Unless the process has changed in the last couple of years you fill in the same forms and with the same supporting documentation as in the original application (except that you don't need to resubmit your qualifications and stuff that hasn't changed). The new employer needs to submit the same justification why they can't find a local to do the job and evidence that they have tried.