Hexagonal Birdhouse made in Sarnia and Guelph Ontario. Made from a 30+ year old design improved with peer-reviewed literature, this birdhouse makes it easy to attract wrens, chickadees, and nuthatches. With this design, it is easy to mount, clean and maintain the birdhouse for years of enjoyment and functionality. To order contact Travis Cranmer at cranmer.earthdesign@gmail.com. Birdhouses are currently available in both Bright's Grove / Sarnia and Guelph.Cranmer Earth Design
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Favourable Hole Size Mounting Bracket Easy to Clean Drainage Holes Polywhey Natural Finish

Favourable Hole Size - The Benefits of Native Birds

Favourable Hole Size
The Hexagonal Birdhouse uses a 1 ⅛" hole to exclude birds larger than beneficial native birds, such as the house wren. (Troglodytes aedon) This style of birdhouse is placed near the vegetable garden to attract wrens because they eat a large amount of pest insects daily.
Wrens have an average mass of 10.6 grams and are found to eat up to 48% of their body weight per day (Dykstra & Karasov, 1991). However, when wrens are nesting an adult house wren would need to collect 38.8 grams/day (wet mass) of insects to maintain itself and its nestlings during peak nestling food demands (Dykstra and Karasov, 1993b). While only females incubate the eggs, males generally assist in feeding nestlings (Pearse et al., 2004). In comparison, the little brown bat (Myotis lucifugus) native to Ontario will consume 5-10 grams/day of insects (Eder, 2002). House Wrens generally create a nest with a stick foundation, in which a cup is formed, and a linking of bark, dried grass, hair, feathers and occasionally snakeskin and cellophane. Males generally build the nest foundation and then the female adds the lining (McCabe 1965).The depth of the nest box was modified to be most favourable to wrens found in scientific literature. A study completed by Kennedy & White in 1991 showed smaller nest boxes of 808 cm3 to be more successful than those that had a larger volume of 1498 cm3. Cranmer Earth Design's turned box averages around 720-820 cm3. Small nest boxes are better than larger ones because Wrens are able to fill the available cavity and focus on egg laying faster (U.S. Dept. Interior 1979:8).

Species Diet Clutch Size & ID Incubation Period Growth Period
Troglodytes spp.
Insects 5-8 white eggs often heavily speckled with brown to red dots ~12 days ~16 days
Poecile spp.
Insects, seeds and berries 6-8 white to cream colour eggs with light brown to reddish speckles ~14 days ~15 days
Sitta spp.
Insects, small seeds, berries and acorns 5-6 white eggs often speckled with brown to red dots ~14 days ~24 days
Parus spp.
Insects, seeds and berries 5-6 white eggs often speckled with brown dots ~13 days ~16 days

House Wren
Black-capped Chickadee
Red-breasted Nuthatch
House Wren in Turned Birdhouse built by Cranmer Earth Design in Guelph, Ontario, Canada. Black-capped chickadee in Hexgonal Birdhouse built by Cranmer Earth Design in Guelph, Ontario, Canada. Red-breasted Nuthatch
Picture by Hugh Gibbons Picture by Travis Cranmer Picture by Sarah Dykeman


Simple Installation - Selecting a Location

Favourable Hole Size
Finding the optimal spot in your yard can be a tricky task. The mounting bracket makes this step that much easier. Try to find an area free of predators. The harder it is for the predator to reach the birdhouse, the better chance that every brood will survive. Locations could include:
Metal post/pole(most favourable)
Slippery building facade
Brick building facade
Wood siding
Wooden fence post
Tree trunk
(least favourable)
Birdhouse by Travis Cranmer - Turned Birdhouse - Cranmer Earth DesignTurned Birdhouse by Cranmer Earth Design built by Travis CranmerTravis Cranmer First Turned Birdhouse - Cranmer Earth Design - Turned Birdhouse
Birdhouse mounting height should be between 5 to 12 feet The birdhouse should be mounted 1.5-3.7m (5-12') from the ground facing west, south or east.

Easy to Clean - The Effortless Bracket System

Favourable Hole Size
Just like the hexagonal birdhouse design, all turned birdhouses come with a bracket system. After the eggs have hatched and the birds have fledged, the birdhouse should be cleaned. If cleaned regularly, you can have up to three fledges of birds in a year. Clean by removing birdhouse from bracket, taking off the roof, and turning upside down allowing old nests to fall out. Reassemble and the birdhouse is ready for another family.

Step 1
Step 2
Step 3
Step 4
This birdhouse plan makes it extremely simple to clean out old nests Travis Cranmer Hexagonal Birdhouse

The mounting bracket is designed to avoid ice build up if the birdhouse is taken inside during the winter. (As seen to the right) To attach to a pole, simply use a stainless steel hoseclamp around the lower portion of the mounting bracket instead of using a screw. (As seen to the right)

Optimal Water Drainage - Built to Last

Favourable Hole Size
The bottom of each turned birdhouse has one or more holes allowing water to flow out and prevent moisture buildup. By allowing the interior moisture to escape you are providing a dry environment for the occupants as well as preventing the structure from deteriorating. Drainage Holes in Turned BIrdhouse
Original Turn Birtdhouse Bert Cranmer, Travis Cranmer's grandfather. Handcrafted with attention to detail and built to last. The turned birdhouse design could be compared to the rounded cavity of a tree which may be preferred by the birds building nests. The design has been passed down from Bert Cranmer, Travis' grandfather. This design is composed of 14 sides that are glued together and then spun on the lathe to create a perfectly round birdhouse. The birdhouses that are different colours are composed of two different types of wood, typically seven sides of maple, and seven sides of the other type of wood. The pine birdhouse to the left built by Bert Cranmer has lasted over 20 years outside and had no additional preservatives applied after the initial coats. However, if a waterproof coating is applied every few years it will ensure the turned birdhouse maintains its colour and structural integrity. A birdhouse of the same quality and value is hard to come by.
Finished with a Environmentally Friendly PreservativeFavourable Hole Size

PolyWhey provides a tough and water-proof coating created from whey, a bi-product of the dairy industry. Unlike oil-based wood finishes that rely on petroleum, PolyWhey is derived from a renewable resource, has a VOC level of ≤180g/L (very low) and does not require a year to outgas - it is safe for birds the day it is finished.

Vermont Natural Coatings PolyWhey Exterior Caspian Clear
Many birdhouses require a year to 'outgas'. PolyWhey eliminates this problem and the birdhouse is safe for birds from the day it is finished.
Cranmer Earth Design uses PolyWhey coating Although birds prefer a weathered look, after a few years the PolyWhey coating may start to show signs of wear. Another coat of preservative can be applied to extend the life of the birdhouse. Birdhouses mounted under an eave or porch will maintain their finish better than those fully exposed to the elements.
All wood products are affected by changes in the environment, (temperature and humidity) which can cause hairline cracks and slight warping over time if not sealed regularly. Cranmer Earth Design uses PolyWhey Exterior Wood Finish (Caspian Clear) from Vermont Natural Coatings. To find a retailer nearest you please click here.

Made in Canada - Materials Used as Local as Possible

Made in Canada
While not all materials used in making these birdhouses can be produced in Canada, these birdhouses are manufactured from the raw materials below in our workshops in Guelph and Sarnia from start to finish.
Wood - Eastern Canada (Maple, Walnut, Butternut & Oak)
Exterior wood glue - Columbus, Ohio, USA
PolyWhey® Exterior Wood Finish - Vermont, USA

Unique Birdhouses & Burnt Designs

Unique Birdhouses
Several birdhouses have had extra attention when it comes to the production process while others have had some decorative woodburning added on the birdhouse body. Not all birdhouses are found on the Online Store, so if you are interested in a particlar type, please E-mail cranmer.earthdesign@gmail.com. Turned birdhouses have been made out of:

•Black Walnut - Juglans nigra
•Butternut - Juglans cinera
•Oak - Quercus spp.
•Maple - Acer spp.
•Padauk - Pterocarpus soyauxii
•Pine - Pinus strobus
•Purple Heart - Peltogyne paniculata
•Zebrawood - Microberlinia brazzavillensis

Zebrawood Turned Birdhouse built by Travis Cranmer of Cranmer Earth Design Travis Cranmer's Unique Checkered Turned Birdhouse Pine Burned American Chestnut Turned Birdhouse with a burnt design of American Chestnut by Sara Stricker

Turned Birdhouse

The Turned Birdhouse

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Aug 20th, 9-5
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