We only have proper accommodation for one wwoofer at a time with the exception of individuals who are up for camping which is far from ideal for the individuals concerned, especially for long periods of time. The solution came in the form of a tipi.
Tipis (provided they are kitted out properly i.e. proper beds, furniture and a fire for colder weather) are a very pleasant place to be, providing a space that anyone with an adventurous mind set (the same mind set that gets people out volunteering in the first place) would be more than happy to occupy.
We've found that with this new addition our wwoofers morale is greatly improved, purely because they have there own space in which they can hang out and get a bit of well needed privacy, especially with couples and families. This is also benefits the hosts in that the house doesn't feel so full all the time (not that it's a huge problem).
We explored other avenues such as more permanent structures and also yurts which are fantastic but without an endless pot of money we couldn't justify the initial outlay.
It was after attending a course which accommodated the participants in tipis that made me realise there potential. The problems started with realising the lack of available tipis in Portugal. The only one i found was including poles which pushed the price up beyond our capability (for an extra 400 euros for what can essentially be gathered in any given Portuguese woodland). Then we found a guy selling just the cover and liner (no poles) for significantly lower price, and there great.
I hope this is useful to somebody somewhere
all the best