Technical Information


The sizes on this website are the EXTERNAL FRAME SIZE of the building. The thickness of the cladding should be added to get the maximum overall size of the building excluding any roof overhang. We are very happy to make all of our buildings to any size. Please do not hesitate to ask if you would like a bespoke size.


To stabilise the timber and maintain the appearance of your building, a quality preservative should be applied. We use Sovereign SX70 which is a top quality oil based product available in a range of colours and designed to maximise protection and minimise maintenance.

We recommend that at least 2 coats be applied as soon as possible. All of our buildings come with a Top Coat of SX70 as standard. A further coat should be applied within a few weeks. Please contact us if you would like us to do this for you or you can purchase the preservative from us and apply it yourself. We treat all exposed surfaces except the underside of the roof and floor. External doors are treated on both sides. Floor joists are supplied pressure treated in either green or brown and do not need further treatment. Buildings that are NOT top coated by ourselves will be finished With one coat of dip coat preservative to give short term protection only. If you wish to take your building with no treatment please advice us at the time of ordering.


Erecting your own building is not difficult given reasonable DIY skills, a few basic tools, an extra pair of hands and a few hours to spare. When Poultons are erecting a building at the customer’s request, it is the customer’s responsibility to ensure that the proposed site is clear, flat, and of a firm level nature. Where it is necessary for our staff to carry out any site preparation we reserve the right to make an additional charge in accordance with the time taken and any materials used.

To maximise the life of any building it is important that it is kept clear of the ground and any surface water or dampness. Concrete slabs and/or pressure treated timber posts provide an economical solution provided they are firm, level and square. Wooden pressure treated bearers are probably most popular due to their ease of laying. One bearer should be laid at each end of the building across the run of the floor joists and the others equally spaced between, ensuring that each bearer is level with the next. The table below gives a suggested number of bearers for different sizes of building. The floors of our buildings are made so that the joists run in the longest direction. The bearers are always set across the run of the joists. 75×75 bearers are adequate in most cases.

All dimensions quoted on this website are approximate only and nominal before machining in the case of framing and cladding etc.


We have used metric sizes on the website as all timber is now supplied in metric lengths. However, if you prefer, please do not hesitate to ask for your building size in ‘feet and inches’. To help, we have below a table of conversion that we use.

6’ = 1.8m 9’ = 2.7m 12’ = 3.6m 15’ = 4.5m 18’ = 5.4m 7’ = 2.1m 10’ = 3.0m 13’ = 3.9m 16’ = 4.8m 19’ = 5.7m 8’ = 2.4m 11’ = 3.3m 14’ = 4.2m 17’ = 5.1m 20’ = 6.0m

We reserve the right to alter the specification of any building without notice provided that the basic character of the building is not affected.