Deck 4: Deck Stairs

During the last few years answering questions on this website, I've retained a few good examples of different types of deck stairs.

Basic Deck Stairs

Diagram of deck stairs with hand railings showing stringer, treads, ledger post, scab, ground grade, concrete or treated wood pad and footing with measurements.Here is an example of the basic deck stairs off a raised backyard wood deck. Notice that the one piece 4x4 posts holding the deck stairs railing also carry the weight of the stair stringers. When attaching stair stringers to a backyard wood deck with only a 2x6 box joist, there usually is nothing to attach the stair stringers to. Here the stair stringer is bolted to the posts and a ledger board is installed under the stair stringer for those with a longer run. Either pressure treated wood or concrete pads are shown under the posts and bottom stair of the stair stringer, rather than having the stair stringers and posts just sitting on the ground.

Special Deck Stairs

Diagram of tapered steps in a set of stairs between an upper and lower deck with miter angles.In this drawing, tapered deck stairs are shown with the stair treads having equal depths as they turn the corner. This example shows a run of deck stairs between two levels of a backyard wood deck.

Drawing showing extended treads as they go around a corner.Notice in this drawing that the deck stair treads are extended in depth so that the stair nosings are all the same lengths.

Diagram of deck stairs with returns.In this drawing is a raised backyard wood deck of about 5' with deck stairs returning back to the deck. A set of deck stairs such as this is a bit more complicated than the simple deck stairs in the first drawing. This example is from a custom plan that I drew up for Tom, a member of our site. Refer to my article Deck Stairs with Returns. for the plans for these deck stairs.

Other ideas for deck stairs may be to climb up to a pool or hot tub.

Diagram of pool stairs showing front elevation and side elevation with measurements.

Diagram of pool in a deck.Rather than climbing up to a pool, here is a sketch of a pool or hot tub enclosed by a deck, but not sitting on it. The pool or tub is sitting on a level bed of compacted sand.

Diagram of deck stairs with stringers down onto ground sloped perpendicular to the line of the stringers with measurements.

Here is a drawing I did for a couple who had to contend with the back garden sloping 90 degrees to the direction of the deck stairs. Notice how we divide up the vertical height difference as well as the width of the deck stairs for the supports, so that each support has a different height. Since the height difference is 4" we can still stay in the safe envelope of riser height by starting with a height on the left of about 4" and ending with a height on the right of 8".

I hope some of these drawings will help you in deciding how to build your deck stairs and your backyard wood decks.


(Ask Dave) (About Dave)

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Hi, I'm Dave Osborne. With over 50 years experience as a journeyman carpenter, foreman and contractor in heavy construction I enjoyed working with apprentices and sharing the tricks of the trade that others shared with me. Now I get emails from Members all over the world and we include many of my answers in our Free Monthly Newsletters. Some of my answers include drawings and instructions specific to a project, but may also answer your questions. I use correct construction terminology, so you can confidently inform your building supply dealers or contractors exactly what you need.


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