Factors Influencing
Bat House Occupancy Rate

The following is data collected from the
BAT CONSERVATION
INTERNATIONAL'S BAT HOUSE PROJECT
 
For more than a decade 7,000 research associates, volunteers, and colleagues collected and shared data from bat houses in varied climates and habitats across the continent. These findings have dramatically increased bat house success.


Bat House Project Annual Surveys (% Number In Bold Reflect Wayne NJ Conditions)
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Mounting Location Occupancy Rate # Of Houses
Trees 20% 25 of 125
Poles 52% 503 of 960
Wooden/Masonry Buildings 64% 264 of 411
Roost Chamber Height Occupancy Rate # Of Houses
Less than 15" 44% 98 of 222
15 to 24" 51% 485 of 957
25" or more 64% 239 of 374
Rost Chamber Width (side to side) Occupancy Rate # Of Houses
Less tha 15" 51% 179 of 348
15 to 24" 55% 385 of 698
25" or more 72% 84 of 117
Number of Chambers Occupancy Rate # Of Houses
1 or 2 50% 243 of 490
3 or 4 50% 386 of 768
5 or more 65% 193 of 295
Urbanization Occupancy Rate # Of Houses
Urban 41% 46 of 112
Suburban 42% 112 of 267
Rural 57% 664 of 1,174
Dominant Land Use Within 1-mile Radius Occupancy Rate # Of Houses
Cattle Ranching 48% 32 of 66
Residential 48% 146 of 306
Farms/Natural Vegetation 57% 272 of 474
Natural Vegetation 59% 304 of 519
Dominant Natural Vegetation Occupancy Rate # Of Houses
Wetland 28% 19 of 67
Desert 31% 25 of 80
Forest 54% 409 of 753
Grassland 55% 142 of 259
Overgrown Field/Shrub 61% 132 of 217
Nearest Freshwater Source Occupancy Rate # Of Houses
Marsh (all sizes) 38% 32 of 85
Stream (less than 50' wide) 50% 229 of 454
Pond (less than 25 acres) 51% 234 of 463
River (greater than 50' wide) 60% 110 of 184
Lake (greater than 25 acres) 61% 190 of 313
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Bat House
Annual Occupancy Surveys

Mounted On Poles
52% Occupancy Rate

Chamber Height 25" or more
64% Occupancy Rate

Chamber Width 25" or more
72% Occupancy Rate

Chambers 5 or more
65% Occupancy Rate

Urbanization - Rural
57% Occupancy Rate

Nearest Freshwater Source
Stream - 50% Occupancy Rate
Pond - 50% Occupancy Rate
River - 60% Occupancy Rate
Lake - 61% Occupancy Rate

Time Until First Occupancy
1 to 6 Months - 48%
7 to 12 Months - 15%