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Hi Nat. I think it depends on what birds you hope to attract. Blue Tits and Great Tits will readily nest in boxes. House Sparrows will too although they seem to prefer to live communally and often seem to prefer crevices under the eaves of houses. AS far as I know Goldfinches don't use nest boxes and Robins if they use them prefer open fronted boxes.
Here's a link about nest boxes and some information about preferred hole sizes.
www.rspb.org.uk/.../making.aspx
Adding a plate to reduce the hole size for you preferred species can also help to deter woodpeckers (if you have any in the area) which will attack boxes if the hear the youngsters cheeping.
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Tony
My Flickr Photostream
Hi
Blue tits- 1 inch
Great Tits - 1 inch and an 8th
House Sparrow - 1 inch and a half
S
For advice about Birding, Identification,field guides, binoculars, scopes, tripods, etc - put 'Birding Tips' into the search box
Hi, I have done bit of surfing on the net and what i can find is:
Gold Finches: Don't nest in boxes prefer bushes and Trees
Bluetits, Coal tits and Marsh tits: 25mm hole (i have a blue tit in mine atm so hoping it will nest next year) - will check its hole size.
Great Tit & Tree Sparrow:28mm
Robin & Pied wagtail: Small box, 100mm high front pannel rest open
Wren: 140mm high front pannel
Spotted fly catcher: prefer low 60mm front box
House Sparrow:32mm
Starlings: 45mm
I hope this helps, and wish you good luck :)