That is my plan.
Due to the small size of my loft, I'm afraid this is not possible. My birds need the nest boxes as extra space. They often hang in the nest boxes, but they do not roost there, only on the perches.
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Hi. If they don't roost in the boxes, and they won't be breeding in them off season, you can block them up (as you say they have enough space not to need to roost in them)... or, cut some wood / wire panels and set them a few inches inside the nest boxes to close off most of the space in them, but still give them a ledge to perch on (if you are worried they have not got enough space).
If they have formed a pair they will not pair up with any other female birds in your loft if left to nature, unless you physically separate them for some time and pair them up with females in a closed nest box. Even then, if you allow them both free in the loft after they have got their new partners, they will see each other and get back together!
Your other option is leave them as they are... and maybe one or both of them will mate with some females in the loft, so you will get some young off them.
Because, even thought pigeons form a strong pair bond, they are not at all monogamous and often 'cheat' on their mates![/QUOTE]