How to Build a Weatherproof Outdoor Storage Bench

Benches in a backyard serve two masters: they offer a place to rest and a way to hide the clutter that inevitably migrates outdoors. Building your own allows you to customize the dimensions to fit a specific corner of your patio or deck while ensuring the construction is rugged enough to handle heavy winter snow or a scorching summer sun. Done well, this project yields a piece of furniture that stays dry on the inside and sturdy on the outside. We prioritize structural framing with pressure-treated lumber and simple cladding to keep the costs reasonable and the maintenance manageable. Follow these steps to ensure the lid operates smoothly and the frame remains square for years of service.

  1. Measure and Cut Straight. Measure and cut your 2x4 pressure-treated lumber into eight 18-inch vertical corner posts and the necessary lengths for your front, back, and side aprons. Ensure all cuts are perfectly square to prevent the bench from rocking once assembled.
  2. Lock the Frame Together. Build two rectangular frames for the front and back, then connect them using the side rails. Use 3-inch exterior-grade deck screws, driving two screws into every joint for maximum stability.
  3. Reinforce the Bottom. Attach 2x4 cross-members across the bottom frame spaced 16 inches apart on center. This provides a platform for your base panel and prevents the bottom from sagging under the weight of stored items.
  4. Skin the Frame. Screw 1x6 cedar or pressure-treated boards to the exterior of your frame, starting from the bottom and working upward. Leave a 1/8-inch gap between boards to allow for wood expansion and contraction due to humidity.
  5. Install the Hinged Lid. Construct a separate 2x4 frame for the lid slightly larger than the box, then attach the decking boards. Secure the lid to the back frame using a continuous heavy-duty piano hinge for smooth operation.
  6. Seal Against the Elements. Sand any rough edges until smooth, then apply two coats of high-quality exterior wood stain or sealer. Pay extra attention to the end grains of the wood, as these soak up the most moisture.