A1 BaseKIT | Timber Frame Shed Base

The A1 BaseKIT Wooden Shed Base is a Tanalised® (pressure-treated) timber frame system that can be fitted to hard, soft or uneven surfaces.
  • Strong pressure-treated timber
  • Free professional installation
  • No ground preparation required*
  • Great for uneven surfaces* (max. slope 30cm)
  • Keeps shed floor dry
  • Can be used on grass, concrete, soil, or mixed surfaces
  • Suits TGB Garden Buildings, Saltire Sheds, and A1 Sheds
  • More cost-effective than paving slabs or concrete


A1 BaseKIT™ Timber Shed Base System

This shed base is a rectangular Tanalised® (pressure-treated) timber frame system. A1 Sheds first developed this shed base back in the 1980’s in order to create a low cost, simple, fast and effective solution for gardens with uneven or mixed surfaces. Nowadays, this timber shed base is also known as an AirTech Base, Pin-Base, PortaBase, PowerBase etc. however the basic design remains the same.

** The A1 BaseKit is only available as an optional extra for the TGB, Saltire and A1 branded timber buildings only, and it cannot be delivered separately

If you choose us to assemble your shed, then we’ll assemble and install this shed base for you FREE OF CHARGE. There is NO GROUND PREPARATION REQUIRED* and we are able to fit it onto any firm surface… inc. grass, soil, gravel, uneven slabs, concrete etc. The ground below doesn’t need to be level either, therefore the A1 BaseKIT can be fitted onto gently sloping ground (max. 12″), uneven ground, and mixed surfaces if required, all you need is an area clear of any movable obstacles or shrubs.

Please note that the design of the A1BaseKit, the quantity of pegs, and their positions will vary depending on the size of building, and type of ground.


  • FREE INSTALLATION (only when purchased with a TGB, Saltire or an A1 branded timber building)
  • SUITABLE FOR ANY SURFACE* (max. slope 30cm)
  • Extra airspace keeps underside of shed dry (increasing longevity)
  • Can be used on grass, concrete, soil, or mixed surfaces (soft surfaces must be be firm enough to support ground pegs)
  • Suits most square or rectangular TGB Garden Buildings, Saltire Sheds, and A1 Sheds
  • Made from long-lasting pressure-treated timber
  • Significantly less expensive than paving slabs or concrete
  • Perfect for use with the QuickJack adjustable base system if fitting yourself

A1 BaseKIT Animation

Click below for an animated view of the A1 BaseKit.


Our assembly service is only available for slopes with a maximum drop of 30cm across the floor area of your building. We may be able to accommodate larger slopes, however there will be an additional charge (the amount will vary depending on the individual circumstances), and we must be advised prior to arrival in order to bring the appropriate materials otherwise the building and base will be left for self assembly. Alternatively a return visit can be arranged, however there would be a significant handling and return charge. *Ground must be firm enough to take the weight of your building. We are unable to provide a solid fixing into freshly disturbed, or boggy ground, as this can’t support the posts or the frame. Before ordering, please let us know if your ground is like this, and we’ll let you know what can be done.

PLEASE NOTE: It is the homeowners responsibility to check that there are no under-ground services i.e. electric, water, sewage pipes etc. before post or pegs are hammered into the ground, as we will not be liable for any damage caused.