Bird Box in mahogany

Hi SingD, I would suggest being a new box it may just take the birds longer to get used to it being there, even though it is in the same position as the old successful nest-box and as long as it is raw wood (ie., not pre-varnished or painted) then I don't see why you couldn't use mahogany wood just as successfully. . Although the size of nest hole for blue tit is suggested 25mm latterly I opted for 28mm entrance as minimum when buying new boxes and added a 28mm metal hole plate to the entrance which will protect the hole being pecked at and widened by any wood-be predators such as G.S.Woodpeckers.. If the dimensions are roughly what are in the guidelines and similar to your old nesting box (even 25mm hole) then I think it may be just a matter of giving the birds more time to get used to the new box in situ although some blue tits will have already chosen a box by now; they are quite fussy little blighters when choosing and will often revisit a box many times before finally deciding to give it a go ! Fingers crossed and after all your hard work on this lovely sounding new nest box I hope you have some takers for it.