Adding a loft to a room or building is an excellent way to utilise the available space for storage, work, or relaxing. It's important that you make it easy to get in and out of the loft so that you can make the best use of it. Here's a simple and easy-to-build wooden loft ladder design.
Measure the distance from the floor to the floor level of the loft.
Cut two pieces of 2-by-4 lumber so that they are 1-foot longer than the measurement you just took. These two pieces will be the outside supports of the ladder.
Cut 24-inch segments of 2-by-4. Each of these will be a rang in your ladder. You'll want enough so that you can space the rungs 12 inches apart.
Assemble the ladder, placing the rungs 12 inches apart, starting from the floor end of the ladder. Secure each rang in place with two 3-inch woodscrews. The 4-inch side of the board will be the part you put your feet on.
Place the ladder against the loft so that it is straight up and down. Screw the ladder into the timber of the loft with the two 6-inch lag bolts. Drilling a small pilot hole with your drill will make this much easier. The end of the ladder will extend 12 inches above the floor level of the loft--this provides a safety handrail for when you're getting on and exiting the ladder.