Hi @els,
I am grateful for this initiative, and at the same time I worry that this choice comes a bit too early, and also that there are more options compared to what you are presenting.
What follows below are my personal views …
I would recommend everybody to take at least a very small private basement
The way I understand things, having a private basement increases the resale value of your apartment. It’s something that future buyers will want, and (you never know) which is also of interest for future tenants. It’s true it adds the your purchase price of your unit, but I would personally advice against not having a private basement.
It’s important to get a good sense of space
Before taking a decision, I think it’s important to get a feel, so my invitation is for everybody to have a look at my own here in the basement.
How to distribute the available square meters
In the current plans there are 83 m² of private basements available. Shared evenly, this comes down to 3.5 m² per unit.
One option could be to divide the private storage space equally, i.e. every unit gets the same amount of space. One can argue for or against this, but I’m not going to go there.
It could however be a good starting point: we could say for example that we put the square meters of those who want less than 3.5 m² into a common pot, and that we top up the square meters of those who want more proportionate to the size of their unit (so bigger units get a bigger extra).
If then we want to cater even more for people’s preferences, we can also add the question “how important is it for you to get extra square meters?”. For example, if there would be someone who, for personal reasons, would really like more than their fair share, maybe there are others who don’t care so much after all, so then why not accommodate that wish if it is possible.
Making it modular
Sharing space is the core idea of a cohousing, and storage space lends itself very well for it.
There are several options here, and I think it is possible to give everybody the option to participate in it or not: those who want a private storage space, with walls, a door and a lock can get one, and those who would like to pool their space have the possibility to create a bigger, shared space.
The way I imagine the pooling is that on paper you would be the owner of x square meters (the borders can be painted on the ground, and the space can always be reclaimed - or something like that).
And then I image we can set it up the way we see fit. It could include a bigger space, for example for people who want to store bigger items (e.g. the antique desk of your grandfather), event though we will need to make clear agreements about hoarding (which is doable). Or we could merge the private space of 3-4 units into a (walled) space with shelves, where everybody then leaves boxes with their name on.
Reducing the number of square meters
One of the options on the table is to move the laundry room to the basement (see Common spaces - where to put the washing area - #7 by Lee).
Say this reduces the available number of square meters to 73, then this still leaves 3 m² per unit. If some people would choose to go modular, I don’t see why this is not possible.
Next steps
I would personally first try to consent to the pre-final plans, i.e. where to put the laundry room, before going into the details of private storage space.