How To Use Our Decking Builder

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Decking can be a tricky project to work out. It may seem daunting…..

How many decking boards do I need? 

Which size screws do I need?

What joists should I order?

So, Main Line Timber have created a brand new decking calculator to help make it an easy job for you. 

Garden Decking Complete Before Planting W600h400

Let's Begin

  • First of all, refer to our blog about planning your decking area.
  • First of all, refer to our blog about planning your decking area.
  • First of all, refer to our blog about planning your decking area.
  • Now, with a rough drawing of the deck are and all the measurements you need we can make a start.
  • Select the width and length of your deck area using the calculator.
  • Pick the thickness of your deck board. Either 32mm or 27mm, this is the finished size.
  • Then choose, 100 x 50 or 125 x 50mm joists, medium frame or heavy duty.
  • Select if you require stump posts in the ground, 600mm, 900mm long or 1.2m, this allows for some in the ground.
  • Then click calculate!

A price is now shown for all of the materials you will need to build your decking. If you need fixings, please choose and add to the order, decking screws, bolts etc. Then you can add or remove joists or add or remove decking boards to the total order.

Order & pay and we'll look after the rest!


Delivery will be made normally within 3 – 4 working days from the date of the order being placed. Now you have the materials you need, it’s time to fit it!

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COVID-19 Update

Main Line Timber Update

Since mid-April, demand for certain products has been twice as high as would normally be anticipated for the time of year. This gave rise to supply issues and therefore we have had to make the decision to cater for our trade and account customers only. As soon as this situation changes our website will be updated accordingly.

We are still working to government guidelines in relation to Covid-19 and continuing to follow social distancing.

Revised opening hours
8.00am to 4.00pm Week Days Only

Thank you to all of our customers for bearing with us during this difficult time.