After reading that article, I don't think many people stick to those guild-lines, judging by the sizes of hutches sold in pet shops which are shockingly small :shock:
Our bun will probably remain an indoor rabbit, I don't think I would feel content leaving him outside all the time but I will definitely have to look into this. Before buying the cage I researched about housing for dwarf rabbits I came across many sites which give the measurements of 18X24x14 cage or larger to which our cage is bigger so being a new bunny owner I thought this was ok for him but yeah, I already feel when he's bigger I would not be happy with him in this cage.
Our bun has been sleeping for ages now, think his big run around the kitchen today has wore him right out :lol:
Some people don't stick to the guidelines, but in not sticking to them they are ignoring the RSPCA five freedoms. Some of the hutches/cages sold can actually result in health problems from a lack of exercise too, remember wild rabbits can run 5 miles in a day, and domestic rabbits are not that different.
I have a feeling that those measurements that you found are what is used for factory-farmed meat rabbits, which is definitely not good by welfare standards. In America the housing sizes are much smaller and should be disregarded, so be careful where you look for info. The link I posted is the official guidelines. The RSPCA sets out the same minimum hutch sizes.
The thing is, whilst dwarf rabbits are small, they tend to be faster and more active than bigger rabbits, meaning that they need the same size accommodation as a normal sized bun. This doesn't mean indoor buns need to be put outside, it just means that they need to be given space inside the house. The size of accommodation must not be smaller than 6x2ft, however if you are going to give plenty of time out of the cage it does not have to be the full 6x2ft hutch attached to a 8x4ft run. Instead it depends on how much time, realistically, they get out. 18 hours or more and just the 6x2ft will be fine, I would say. Anything less than 18 hours free-ranging and you need bigger than 6x2ft, as they will be in there for a long time each day. It is also worth considering where the rabbit will be at their peak awake-times, at dawn, dusk and in the wee hours of the morning - because ideally this is when they will need the most space.
If you have a look at the stickied thread on indoor housing, there are some ideas there. Free-ranging all day and night is obviously preferable but if you have to keep him confined I have always found pens that can fold away to be best, as I can set it up when I am going out and take it down when I get back in and the rabbits can free-range. This means that it doesn't matter how much space it takes up, because you are not there using the space anyway. However, recently I was thinking to move my pair back indoors and saw this, which can be made to your specifications, as it is much prettier than a cage:
https://www.facebook.com/Manorpethousing?fref=ts