He did Hajj ifraad then he did ‘Umrah after Hajj from his city; does it count as Hajj tamattu‘?
Question

                I work in Riyadh and I did Hajj this year, 1433 AH, praise be to Allah. I did Hajj ifraad [Hajj on its own, without ‘umrah]. Then I went back to Riyadh, then I entered ihram for ‘umrah on 28th Dhu’l-Hijjah. Am I now doing tamattu‘ [Hajj and ‘umrah together, exiting ihram in between]? Do I have to offer a hadiy (sacrificial animal) or not? May Allah reward you with good.
Praise be to Allah.
      One of the conditions of tamattu‘ being valid is that 
      ‘umrah should be done before Hajj during the months of Hajj. Then when the 
      pilgrim has finished his ‘umrah, he enters ihram for Hajj. If he does Hajj 
      ifraad, and then when he has finished the actions of Hajj he does ‘umrah, 
      this is not tamattu‘; rather it is ifraad. 

    An-Nawawi (may Allah have mercy on him) said: With regard to 
    tamattu‘, the original format is for the pilgrim to enter ihram from the 
    miqaat of his country, then enter Makkah and complete the actions of ‘Umrah, 
    then begin his Hajj from Makkah.

    End quote from al-Majmoo‘ (7/168) 

    Al-Kaasaani (may Allah have mercy on him) said: With regard 
    to tamattu‘, according to Islamic terminology, this refers to someone who is 
    not a resident of Makkah who enters ihram for ‘Umrah and does the actions of 
    tawaaf and sa‘i during the months of Hajj, then he enters ihram for Hajj in 
    the months of Hajj, and does Hajj in the same year (as his ‘umrah).

    End quote from Badaa’i‘ as-Sanaa’i‘ (2/168) 

    See also ash-Sharh al-Mumti‘ (7/82) 

    And Allah knows best.