Questions we are frequently asked – Is it difficult to assemble one of your garden sheds?  No its not hard to do. In this guide, you will learn and see how easy it is to build a your own Garden Shed from Shed Monkey.

Is it difficult to build a Garden Shed?

Believe it or not, you don’t need to be a professional to build a Garden Shed! With some assistance, Shed assembly is a DIY task that is easier than you may think.

We have put together a simple guide on how to build a traditional Shed.

Your new Garden Shed will arrive with full assembly instructions. These instructions are a simple step-by-step guide to Shed assembly. Remember – your Shed might have more than four side walls to it so assembly would be a little different in this case!

What do I need to build a Shed?

Before even considering assembly of a Garden Shed, there are three things you need to do first.

  • Check your base is firm and level
  • Check all of your shed components are there
  • Check you have the right tools required and at least one other person to assist


You need to have a firm and level base prepared to build your new Garden Shed on. This must be made using a suitably durable material such as concrete or paving slabs. If you’re unsure how to do this or would like some guidance please speak with one of our dedicated sales advisers.

Important! Check you have all of the Shed components in order to complete the full assembly of your new Garden Shed upon delivery, you will receive the components list which will allow you to check off the parts received against the parts you should have. Generally, each Garden Shed will comprise of panels for the four walls, floor, and roof, felt, and fixings.

Tip: Take the time to check through your components before assembly, this will aid in a swift and efficient building process.

The final preparation you need to make for assembly of your Garden Shed is ensuring that you have all the tools you are going to need. For assembly of all Garden Sheds, you will need the following.

  • Hammer
  • Correct size of spanner or Adjustable Spanner
  • Step Ladder or ladder
  • Suitable spirit Level
  • Tape Measure
  • Safety Gloves or appropriate hand protection


Tip: For your safety, we would advise that Garden Shed assembly is always carried out by a minimum of two able bodied people – One person to hold the components/sections in place and a second to nail or bolt into position.

If you have checked and prepared everything required to build, you’re ready to assemble the Garden Shed.


Step One – Positioning the Wooden Floor Panel

Lay the wooden floor panel(s) down in the desired position and check that the floor is level. If the floor is not perfectly level, you may need to pack under the bearers with some blocks or packings to level out the base. At this stage, you may wish to check that the floor is square by measuring diagonally across the floor from corner to corner. Each diagonal measurement should be the same.

Tip: If your floor is not square, you can measure the panels to check that they match up to the corresponding side of the floor. If they do, it may be that the panel has simply been knocked out of alignment during transit. You can resolve this by tapping the floor at either corner to straighten it out again.


Step Two – Position, Secure Gables and Sides

First of all, position one gable end panel on to one end of the floor panel.

Next, offer-up a side wall panel and secure this to the gable by using the 38mm nails. You should nail through the side into the gables internally. Using the coach screws provided, secure the gable panel to the side panel, through the pre-drilled holes in the gable from the outside.

Now, you need to place the second gable panel in position and secure this to the side panel you have just put in place. Again, use the 38mm nails and coach screws provided.

Finally, position your final side wall panel and secure with the nails and coach screws as before.

When all of your wall panels are in place and you are satisfied that they are sitting square, secure them to the floor using the 65mm nails provided. You will need to nail through the side and gable panel base rails, through the floor boards and into the floor joists/bearers below.

Tip: You will see lines of nails across each floor panel where the floor boards have been fixed to the floor bearers/spars. These can be used as a guide to ensure that you secure the bottom base rails in the correct position to penetrate into bearers/spars below.


Step Three – Position and Securing the Roof Panels

Placing the roof panels in position, secure these internally to each other with the 65mm nails provided. Tip: You may need to pull the two panels together at the apex/ridge before you can nail/fix them to each other.

Next stage will be to nail the roof to the outer gables and side wall frame with 38mm and 65mm nails provided.

Tip: If at any point the roof panels do not correctly align or the door will not open/close properly, this may suggest your wooden building is not sitting square to your base and may have become twisted. To resolve this, you may need to lift a corner slightly to straighten out the twist. If square, you can now secure all of the roof panels. If you are still having trouble to resolve this, and need extra help and advice, please call our sales team without delay.


Step Four – Felting the Roof

Before you start, please be aware that some certain sizes of wooden buildings may need the roofing felt cutting into two or more pieces. Please consult the felt leaflet, you will receive this with your wooden building.

Once you’ve checked the number of lengths of roofing felt required, cut the roofing felt received (if necessary) and roll out along the lower part of one side of the roof, allowing sufficient overhangs to fold down onto the roof edge framing (do not fix to the underside of the roof). Use the galvanised clout nails provided in the pack to secure along the top edge of roofing felt. Repeat this process on the other side of the roof.

Depending on the size of wooden building, you may need to repeat this process again along the upper sections of the roof, overlapping the felt at the top apex. Note: Not all wooden buildings require a ridge piece so it is best to check the felt guide if you are unsure.

Tip: Don’t set your roofing felt too low when positioning the first strip/row as you will find, you won’t have enough to cover the roof area. You will only need to overlap around 3 inches, you will then have enough to cover with the roofing felt supplied.


Step Five – Fitting Bargeboards and Decorative Finials

Securing the wooden Bargeboards to the end Roof Panels, trap the overhanging roofing felt between the roof and Bargeboard to provide a weatherproof seal. When you are happy with the position of the Bargeboards, secure the pre-cut diamond shaped finial to the Bargeboards at the Apex.

Tip: The wooden Bargeboards are generally longer than the roof panel sections. However, you can trim them down to be flush with the edges of the roof if you would prefer. To do this, hold the Bargeboards up against the gable end and cut before securing them in place.


Step Six – Fitting, Sealing the Glazing

Slot the Glass or Perspex into position and secure using the panel pins provided. You will need to gently tap the pins into the window-frame to avoid scratching the windows.

If you have the Perspex windows for your building, you will need to remove the protective film from the panes.

You will need to seal the windows after the panes have been fitted to ensure they are weatherproof. To do so, use a suitable sealant product such as silicone, mastic, putty, etc. and your choice of beading to reinforce the panes if preferred.

Tip: To prevent you scratching the Perspex whilst hammering in the panel pins, we advise leaving the protective film on the panes until fitted in place. You could use a piece of thin cardboard to stop the hammer coming into contact with the panes.


Step Seven – Fitting the Corner Trim Strips

Finishing assembly, use the 38mm nails provided to secure the corner strips to each exterior corner of your Shed, this is where the panels meet on the corners. These may need cutting to fit correctly.

Now all that’s left is to treat your Garden Shed with a suitable waterproofing preservative inside and out.

Don’t forget to share your completed building with us! Send all images to [email protected] or post to our facebook timeline #shedmonkey