Wooden outdoor deck stairs

How do you build wooden outdoor stairs?

In this blog post, we will explain how you can easily build outdoor stairs or garden steps yourself.
It is really not as hard as you might think, you can easliy do it yourself!

Then let us start by making our shopping list, what do you need in order to build your outdoor stairs?

  1. at least two staircase stringers for garden stairs
  2. stair steps for the steps (2 timbers per step)
  3. screws in stainless steel in order to fix the timbers on the staircase stringers
  4. galvanized fastening brackets in order to fix the stairs against a wall and on the ground
  5. an electric or manual screwdriver with the appropriate screwbit
  6. a drill for drilling holes in the wall in case it is made of stone
  7. screws for the fastening brackets
  8. Possibly timber in case you wish to make risers
  9. a level

New in 2021: a ready to go deck stairs kit to build your outdoor stairs!

You can stop counting and calculating, we have already done so for you.

After multiple requests from our customers, we have composed ready to go kits for outdoor stairs. You just simply choose the material you prefer, the number of steps you need in order to reach the necessary height, the width you desire, with or without treads and each dek stairs kit that we propose already contains everything that you need in order to build the outdoor stairs! The right number of stringers, steps, treads, all sawn to the right width, and with the right number of screws. Nice and easy, right?

Simply use the Deck stairs configurator!


If you prefer to do your own counting and calculating, you can of course do that too: you will find all the advices and supplies further on in this blog post.

If you want to fix the stairs to the wall or floor, please note that you will be needing mounting brackets, which are not included in the deck stairs kit.

Now we are going to explain to you step by step how best to make the staircase:

In this example, we will assume an outdoor staircase with standard timbers for the steps made from pressure treated pine wood, which you can order from us. You can also use deck timbers 145mm wide.

Mounting a standard outdoor staircase

  1. Place the stringers on their backs on the ground with the points up, side by side with a maximum of 60 cm between them. We sell timbers for your stair steps of 60, 80, 100, 120, 140 and 160cm wide. For a width of 60 to 100cm, you will be needing 2 staircase stringers, for a width of 120cm or more, 3 staircase stringers.
  2. First screw one step at the bottom of the staircase to the widest part of the stringer, and then one step at the top of the staircase, so that the stringers are equally spaced at the top and bottom.
  3. You can now put the staircase in place against the wall.
  4. Use a level to check whether your stairs are straight.
  5. Fix the stairs with fastening brackets on the wall and on the ground.
  6. Then screw all the steps to your staircase

And your outdoor staircase is ready!

Please find short cuts below for the products you'll need to build your own staircase.

Dimensions of wooden stair stringers Dimensions of wooden stair stringers
Dimensions of wooden stair stringers
Deck stair stringer 2 steps pressure treated wood
€26.95
Deck stair stringer 3 steps pressure treated wood garden stairs
€31.50
Deck stair stringer 4 steps pressure treated wood
€38.95
Deck stair stringer 5 steps pressure treated wood
€44.95
Deck stair stringer 6 steps pressure treated wood
€57.50
Deck stair stringer 7 steps pressure treated wood
€72.50
XL Deck stair stringer 3 steps
€39.95
XL Deck stair stringer 4 steps
€45.95
XL Deck stair stringer 5 steps
€62.50
Steel Deck stair stringer 2 steps
€37.50
Steel Deck stair stringer 3 steps
€47.50
Steel Deck stair stringer 4 steps
€57.50
Steel mounting bracket for Deck stair stringer
€5.95
4x galvanized fastening brackets 35x35x30mm
€6.95
Decking boards 27x145mm pressure treated - double ridge-smooth
€7.60
Decking boards hardwood Red Balau - Bangkirai 28x145mm
€14.95
1 Set stainless steel Carriage bolt M6x80mm + washer + nut
€1.85
RT UNI decking screw drill tip stainless steel - 5x50mm TX20 – 200pcs
€52.50

Out of stock

4x Heavy duty galvanized screw 8x65mm
€6.95