If I am eligible for an extension, where do I go to obtain it? Is there a fee, and what documents do I need to produce?

Visitors possessing a 30-day visa waiver can request a 30-day visit extension from the Ministry of Interior (MoI) Immigration Office at Hamad International Airport (HIA), located behind check-in row 8 in the main departures hall, or at any MoI Service Center located throughout the country. 

You will not need to present yourself in person, but Immigration staff will require your original passport, copies of your confirmed onward tickets, and payment of QAR 100 (approximately $27 USD) to obtain a 30-day visit extension.

Please note that cash is not accepted at MoI Service Centres; only a valid credit or debit card is accepted.

You may find more info here.