Outdoors Wood Fencing Required Items Pressure-treated posts Pressure-treated boards Outdoor wood screws Earth Auger, 40V Electric or Gas Ryobi 40V Auger 10-inch Bit Temporary 3ft Stakes  Twine Concrete/Gravel, estimate 3 60-lbs bags per hole Quick Reference All wood should be  Pressure Treated to last exposed to the elements Verify utility lines before you dig Ontario One Call Fence posts are generally 4x4' Fence posts should not be further apart than 8' Fence posts need to be buried The hole must be as deep as 30-50% of the post's above-ground height Deeper burials provide better rigidity in structure The hole's diameter must be 3x wide as the post used - ex: a 4x4' post is 3.5" wide, requiring a hole diameter of 10.5"  The post should sit flat and level in the hole, and be arrested with collars while concrete or gravel is poured in Fill the hole almost entirely, leaving 4" to be filled with soil Do not attach fencing to posts until concrete is cured Installing Posts Dig holes for the end posts of the fence Install temporary stakes in the same line as the planned fence Run a length of twine between the steaks, overlapping the dug holes.  This serves to ensure that the installed end posts maintain the same facing as one another Flatten the earth at the bottom of the holes, and drop posts within Install Post Collars around the posts Bring the posts level while maintaining facing Pour concrete/gravel around the posts, while performing fine-tuning leveling adjustment Do not  lift the posts once concrete/gravel has been added, as the material will slip under the post's base, reducing its depth Wait for concrete to set Post Collars Collar should be constructed with 2x4's Two boards should run for at least 2' Two other boards should be cut to the width of the post used + 3/16" for tolerance The end result will be a bracket with a hole in its center the same size as the used post It aid in the post holding its position while leveling adjustments are made, and cement/gravel is poured Reference photo: