tbh though not even the PAH hutch is really big enough at 5ft. and I can say from experience that its not. once you have bowls, litter, toys the amount of space is tiny. no rabbit should ever be locked in it fully. your best bet is a hutch & run combo, so they can chose to come outside and have space to stretch and run around. a hutch by itself (or shed) will never be enough.
plus you really get what you pay for. I've had a PAH hutch but the reality was was that it was very cheap wood and cheaply made. it had started to rot after 2 years. putting it together was a nightmare too, as the holes didn't always align. the mesh on it was also only chicken wire, to which I can assure you any determined fox or cat could rip through with ease, or any human as there are some sickos out there. the bolts aren't very secure on there either, a fox could easily open them. or, I had the issue of that some of the bolts didn't align to opening the door (or closing it) was a real issue. you're really going to get what you pay for, go cheap and you're going to get a cheap poor quality hutch that will last a few years if that. go more expensive and you'll get something that will last longer and be better quality.
so sure the PAH bluebell hutch costs like £85 but you're not factoring in costs for the fact that you'll probably need and want to upgrade the chicken wire for peace of mind, and redo the bolts. which could easily be another £50-100 when I looked at doing it.
either way, a hutch will never be enough by itself. nor would a shed likely. its much better to offer a hutch/run combo or shed/run combo. it allows them to come out if they want too, eat some grass if its on grass, get some fresh air, stretch their legs - on their terms. rabbits don't like having bedtimes or being told what to do lol.
you could also consider an aviary, many people use these and find them cheaper and good quality.
for any shed or aviary you're going to need to consider roofing and guttering, for the rain. you'll also want to consider insulation for the cold months either for a hutch, shed or aviary. likewise for a hutch you'll probably want to consider a hutch cover.
the RWAF recommends a minimum space of 10ft x 6ft x 3ft high (3m x 2m x 1m) for a pair of rabbits. even so, it wouldn't be much smaller if you had only a single. you'd still be looking at that size for one rabbit as when you add a second the space usually doesn't double.
https://rabbitwelfare.co.uk/rabbit-housing/
https://rabbitwelfare.co.uk/rabbit-housing/outdoor-rabbit-housing/
if you're in the UK, some of these might be good ideas
https://www.runaround.co.uk
https://www.manorpethousing.co.uk - I believe they do monthly payment plans. expensive yes, but built to last for years upon years.
so tbh with you I would suggest searching for a 6ft hutch, and then getting a 4ft x 10ft run or so. that would cover the space recommended.
Chartwell do a 6ft hutch that is said to be good quality, along with being large. the plus thing is too is that they also do their own runs, which are meant to be connected to the hutch. so no worry about how to connect them.
https://homeandroost.co.uk/product/hutch-6ft-chartwell-double/
https://homeandroost.co.uk/product/hutch-6ft-chartwell-single/
you could probably find it cheaper elsewhere so its good to shop around.
generally though I wouldn't put a rabbit in a hutch any smaller in a 5ft hutch, and I wouldn't keep them in just a hutch alone without 24/7 access to a run. 6ft is better, and offers a lot more room. having onced used a 5ft hutch, it really wasn't big enough for anything leaving little room for the rabbit to hop around.