How to Build Fences on Hillsides

Mark where you plan to build the fence with a string tied between two stakes. The string helps you keep the fence row straight as you dig the posts. Measure and mark where you plan to install each fence post. This distance depends on the length of the fence panels you obtained for the project. If you have an odd-sized section of fence, adjust the length of the fence so you don’t have to alter the length of the fence panel.

Dig the post holes below the frost line in your part of the country. Dig the holes by hand with a pair of hand-held posthole diggers, or rent a power auger. Place 2 to 3 inches of gravel in the bottom of each posthole with a shovel to allow for drainage.

Mix a bag of quick-set concrete according to package directions. Set the corner post in its posthole. Hold a carpenter’s level against the side of the post to ensure it is straight up and down, or plumb. Once it is plumb, shovel the concrete mixture into the hole. Create a mound of concrete on top of the posthole to make sure water runs away from the post.

Add the remaining posts to the fence row following the directions from Step 3. Take care that each post is in a straight line and plumb. Let the concrete cure 24 to 48 hours before proceeding.

Set a panel in place between two fence posts. Either balance the panel on blocks while you level it or have an assistant hold the panel. Set a carpenter's level along the top rail to ensure the panel sets level. Use the level to ensure the panel is straight up and down as well. Mark the location for the installation of the bottom panel brackets on the facing posts.

Drill pilot holes for the panel brackets. Attach the brackets to the posts, using screws that came with the brackets. Set the fence panel in place. Drill pilot holes through the panel connectors on the brackets. Attach the brackets to the panel with the screws from the assembly kit.

Turn the top panel brackets upside down and fit them over the top of the fence panel. Drill pilot holes in the posts and the panel. Secure the top brackets with their accompanying screws.

Move to the next panel and attach it in a similar manner as the first panel. Continue installing the panels. As you work your way along the fence, level the top horizontal bar of each panel with the carpenter’s level.

Cut the tops of the fence posts so approximately the same amount of post shows on each one. Use a circular saw to make the cuts. Coat the tops of the cut posts with wood preservative applied with a paintbrush. Depending on how the posts are set and how steep the hillside, you may not need to do this step.