Step One
Decide on the features of platform bed you want to build. Factors to consider: 1) Are you going to attach a headboard and/or footboard? 2) Do you want a rim around the edge to keep the mattress from sliding? 3) Do you need a more flexible bed or a very firm bed capable of supporting more weight? Sketch your design, or purchase a plan online if you prefer (see Resources).
Step Two
Determine the size of your platform bed. Measure the length and width of the mattress you want to use. Then add 4 inches to the length. The width will depend on whether you are using a rim; add the width of the rim to the width of the mattress. Decide on the finished height of the bed including the mattress. Then subtract the thickness of the mattress from the total height; this measurement is the height of the platform. Remember to consider your headboard and footboard, if any, in your calculations.
Step Three
Choose your materials. 3/4-inch plywood is a good option because it is cost effective and provides some flexibility. Particleboard offers a good value but is stiffer. Consult your purchased plan for the suggested materials.
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Step Four
Cut your materials, or have them cut at your lumber yard or home products store. Refer to your plan, or subtract the thickness of the top surface material from the desired height of the platform; the resulting measurement is the height of the 2 side supports from the floor. The length of the side supports equals the measurement for the length of the platform bed.
Step Five
Sand the wood, if necessary, in the direction of the grain.
Step Six
Stain or seal the wood before assembly. After the platform bed you build is put together, you can go over any raw wood with a cloth coated with stain or sealant.
Step Seven
Assemble the platform bed where you want it to be located. You are basically building a box to support the mattress. Follow your sketch or the instructions on your plan, if you have one.
Step Eight
Attach your headboard and/or footboard, if any. Use 2 sets of L-brackets at each attachment to avoid shifting, which could damage the headboard and/or footboard, or follow the directions on your purchased plan.
More tips are provided at:
eHow / How to build platform bed