Question
Having recieved a job offer and signed the associated contract, relocation is taking far longer than expected, and I no longer expect to have anywhere to live in the new city by the time I originally agreed to start the job comes around.
Is it OK to ask for a delay in the start date of my new job for this reason? If so, how long of a delay would be reasonable?
Background
On July 15th 2019, I found out that I had been successful in my application to join one of my dream companies. However, I will need to relocate for this job.
The following day, I handed in my month's notice at my current employer.
When sent the offer of employment by my prospective new employer, I was asked to provide a start date. I provided them with the September 2nd 2019.
Given I was intending to rent a flat, my reasoning was that I would have time to move down with plenty of time to spare in case things went wrong. This was agreed, and I signed my employment contract which stated September 2nd 2019 as the start date.
Unfortunately, I had underestimated the sheer amount of demand for rental properties in the city I will be moving to. I kept on booking viewings, then arranging to take a trip down to the new city to attend those viewings, only for every single one of those viewings to be withdrawn due to the properties being let to someone else, sometimes within less than a day of the property going on the rental market.
Instead, I started looking into buying a house via shared ownership, and I have been successful in doing so. A mortgage application is progress (with an agreement in prinicple already received), and I have a conveyencer currently proceeding with the legal side of things.
I have been given the date of September 6th 2019 as the very latest the exchange of contracts could take place, and have been told the very latest completion could take place is 14 days after the exchange of contracts takes place. Obviously, I hope that things won't take as long as this (It is not in the interest of other parties to cause delays, as the conveyencer is paid a flat fee, and the property is currently empty so the housing provider is not making any money).
This means that in the worst-case, I won't have anywhere to live in the new city until 3 weeks after the originally agreed start date.
Is it OK to contact my new employer and ask for a delay in start date, or would this risk my job offer / contract being withdrawn?
In addition, if asking such a question is OK, what propotion of that 3 week period would be considered acceptable? (I might be able to reduce this by staying in a bed and breakfast near my new employer for a small number of days, but this is NOT cheap in the city in question)