How to Build a Seawall

One of the biggest challenges in owning a waterfront property is erosion. Building a seawall provides ample solution to the problem of shrinking property line by stopping the gradual migration of the shore to the bottom of the lake.

Before building a seawall for your property, it is best to consult the local authorities for permission to carry out the project.




  1. Inspect the area and determine the ideal location or shoreline where the wall would be built. Note the variations displayed by the seawater, taking into account the time when the seawater covers your property to its maximum level. The seawall should be tall enough to stop the water being brought in by high tides. It also should not be submerged in such situations.
  2. Upon determining the location where the seawall would be built, mark some areas on the shoreline with an interval of about eight feet, as these areas are where the posts would be placed. Dig holes at these areas with the use of a jack hammer since the ground near the shoreline could be hard. The holes should be at least two feet deep and about ten inches wide. Secure the posts in these holes, using a string as guide to ensure that each post has been evenly placed. The area around the post should be filled up with concrete to further secure the posts. The concrete should be left to set and dry out for at least 24 hours.
  3. Cut the boards according to the distance between each post. Make sure the distance between each post is accurately measured, since placing the posts in an uneven shoreline might not allow for even intervals.
  4. Drill holes on the boards to mount them on the posts. Separately measure the mounting points on the post, and mark them on the board accordingly.
  5. With assistance, mount each board unto the post. Fill with some gravel, crushed rock, and sand the lower portion of the side of the board facing the house. Cover the filling with soil. Place the boards on the outer side of the shoreline to allow for easy replacement of damaged boards without ruining the layer of gravel and sand. Seal the lower portions of the wall with concrete to avoid erosion.