My daughter is a second year currently so read all the info from Durham carefully as it may have changed - get your dc to check junk regularly as well and ensure they reply by deadlines - last year a number didn’t and there were dc left without accommodation.
the first thing your dc needs to do is express college preferences (I’m not sure if they need to have firmed / insured before they can do this) - this is where they rank all 16 colleges.
there will also be a form they need to fill out to say they want college accommodation- last year many didn’t do this and therefore didn’t get college accommodation. This is separate from ranking colleges - everyone has a college - not everyone wants college accommodation.
Durham will then issue all prospective students with a preliminary college allocation - again check Durham info for dates. This is not a confirmed college.
After A level results then students are given a confirmed college allocation - this may be the one they already have but they may be reallocated. It says on the website the priority for not reallocating.
Once you have a confirmed college allocation (this may take sometime - my daughter and some of her friends waited 10+ days before they were confirmed into their provisional college (Chads) then the college will contact you and send an accommodation preference form. This will vary from college to college. The college will then allocate you accommodation.
i don’t think timings matter as long as before deadline.
Basically everything up so when you have a confirmed college is done at University level. When you have a confirmed college it is done at college level.
With the exception of Chads and Johns uni accommodation has a set pricing structure. Chads and Johns do their own thing. No idea about Johns but Chads costs are on their website. All uni food is the same except Chads and Johns.
Approx 80% first years at Chads share a room - I know people (maybe parents?) get anxious about this but it’s no big deal as it’s just the norm. My daughter shared - her desire to go to Chads outweighed any worry about sharing. She had a massive room with ensuite. All the rooms at Chads are different as it’s a selection of listed buildings.
good luck! Dd adores Chads and Durham - she is living out this yr but very excited to be back in college next yr (it’s a very normal thing in Durham to live in in 3rd year and always over subscribed). She’s in college everyday as it is to use the library and for meetings etc.