This site is designed mainly to provide . The latest research data from BCI suggests that 2 or 3 or more large bat houses in one location with different characteristics (color, sun exposure, size etc.) could be most attractive to bats, although one well built bat house should have good success rates as well. Building a bat house can be a big job, so I also have BCI approved bat houses for sale.
Follow the red links below to see the two newest (Updated for 2010) bat house plans I have.
A 5-chamber bat house from one sheet of plywood and a
2x6x8 with very little waste. This is my
new and improved big bat house. If you
only build one bat house this is the one I suggest. Improvements in this bat house plan over the
original ‘big bat house’ include taller chambers, much simpler plywood cuts,
slightly less overall weight, and slightly easier assembly.
Chamber dimensions: 22.5” wide x 27” tall
Two 3-chamber bat houses
from one sheet of plywood and two 2x4x8’s with very little
waste. Choose this plan if you
want multiple bat houses, but don’t want to spend too much on supplies. Each bat house is much lighter than the big
bat house, which is an advantage when mounting. Perfect for
lower cost experimentation. Try
venting one and not the other or painting them different colors. Improvements
in this plan over the original ‘medium bat house’ include taller chambers, much
simpler plywood cuts, and slightly easier assembly.
Chamber dimensions: 14” wide x 30.5” tall each
Experiments are still needed to see which factors affect bat house success. For experiments to be most helpful build several bat houses and keep all factors, except one, the same to test the effect of that single factor.
If you are interested in buying a bat house that is already constructed click here:
To inquire about commercial use of my plans, send payment by check (US$ only), or to ask any other questions email me: firstname.lastname@example.org
Bat conservation international (BCI) has a very helpful page that everyone who puts up a bat house should read. BCI has the latest research and is where I got most of my information. BCI’s The Bat House Researcher free online magazine also has great research results from 2001 (latest available online) showing which factors contribute to bat house success. also has helpful articles ( ) that have much the same information you get if you buy The Bat House Builder's Handbook.
The Bat House Builder's Handbook – new second edition by BCI -Very helpful!
Here are a few free bat house plans. I strongly recommend my plans, but these different styles of bat houses might be fun to try in addition to mine. Rocket boxes must be installed on a pole. This design has worked well in some places and might be worth a try especially in combination with my other bat house plans (see Bat house researcher v.9 and ):
I don’t recommend these plans because research has found that bigger bat houses, like my bat house plans, work better. The bat house is small and easy to build however so it may be better than no bat house at all.
BCI Bat house FAQ – Bat links from Bat Conservation International
The Bat House Researcher – from BCI – lots of bat house research results and info
Evicting unwanted bats – Bats in Buildings, Evict bats, These links should help you if you want to remove bats from a building. You shouldn’t evict bats when babies are young. This can vary by species, but to be safe wait until at least August or before the babies are born in early spring. Put up alternate housing (i.e. bat houses) a few weeks before you begin bat exclusion. I am not really a bat removal expert so please see those webpages for more info.
Insulation - (e.g. spray foam or Styrofoam) Unlike heat sinks, which store heat in the bat house, insulation limits the amount of heat (or cold) entering and leaving a bat house. There is a subtle difference in the mechanics but the end result is similar: moderating bat house temperature. Try insulating the bat house attic and maybe also the top 10” or so of a few (non adjacent) bat house chambers. Just as with a bat hosue heat sink too much of it can keep your bat house too cool, which is bad.
Venting – Vary the amount of venting on your second bat house. Either add more vents to the bat house or take them away as you see fit depending on your climate. NOTE: Bat houses in warmer climates should include venting on most bat house models.
Canadian Provinces and Territories: Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Northwest Territories, Nova Scotia, Nunavut, Ontario, Prince Edward Island, Québec, Saskatchewan, Yukon, North America
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Last update 4/19/2010, SMH