UK Timber Sizes

UK Timber Sizes

Most Independent Timber Merchants in the Uk will offer a range of both Sawn and Planed Timber. Care needs to be taken in understanding the sizes stated, some are stated in ‘sawn’ sizes and others in ‘finished’ (ie planed). Below is a guide that should prove useful for those of you looking to buy Timber but are not fully conversant with Timber sizes.

Sawn Timber

Usually refers to Sawn Carcassing that is ordinarily used for building and construction, ie joists, beams etc. Traditionally this material was sold in sawn sizes such as 4” x 2” or 47mm x 100mm, now days the Uk market is used to offering this material ‘regularised’, ie it has smooth planed eased edges making it easier to work with and these sizes are slightly under the sawn sizes as the table below indicates. Regularised Timber can be purchased both untreated and treated, also in C16 and C24 structural grade. Sold in lengths 2.4m – 6.0m in increments of 300mm.

Sawn Size	Regularised Size / Finished Size
47mm x 50mm	45mm x 45mm
47mm x 75mm	45mm x 70mm
47mm x 100mm	45mm x 95mm
47mm x 125mm	45mm x 120mm
47mm x 150mm	45mm x 145mm
47mm x 175mm	45mm x 170mm
47mm x 200mm	45mm x 195mm
47mm x 225mm	45mm x 220mm

75mm x 75mm	70mm x 70mm
75mm x 100mm	70mm x 95mm
75mm x 150mm	70mm x 145mm
75mm x 175mm	70mm x 170mm
75mm x 200mm	70mm x 195mm
75mm x 225mm	70mm x 220mm

Planed Timber

Also known or referred to by Timber Merchants as PAR (Planed all round) and PSE (Planed square edge). Ordinarily this type of timber is used for second fix, joinery, shelving etc and is far superior to construction and building timber. Machined from Scandinavian Vth or Unsorted Pine Redwood and ordinarily sold in lengths of 1.8m – 5.4m.

Sawn Size	Planed / Finished Size
16mm x 25mm	12mm x 20mm
16mm x 38mm	12mm x 34mm
16mm x 75mm	12mm x 70mm
16mm x 100mm	12mm x 95mm

19mm x 50mm	14mm x 45mm
19mm x 75mm	14mm x 70mm
19mm x 100mm	14mm x 95mm
19mm x 150mm	14mm x 145mm

25mm x 25mm	20mm x 20mm
25mm x 50mm	20mm x 45mm
25mm x 75mm	20mm x 70mm
25mm x 100mm	20mm x 95mm
25mm x 125mm	20mm x 125mm
25mm x 150mm	20mm x 145mm
25mm x 175mm	20mm x 170mm
25mm x 200mm	20mm x 195mm
25mm x 225mm	20mm x 220mm

50mm x 50mm	45mm x 45mm
50mm x 75mm	45mm x 70mm
50mm x 100mm	45mm x 95mm
50mm x 150mm	45mm x 145mm
50mm x 175mm	45mm x 170mm
50mm x 200mm	45mm x 195mm

75mm x 75mm	70mm x 70mm
75mm x 100mm	70mm x 95mm

100mm x 100mm	95mm x 95mm

The above list is not exhaustive, it is generaly reflect standard stock sizes that most Merchants would expect to offer, in addition many Merchants will also offer a range of Ex 32mm and Ex 38mm Planed stock. Those with their own maching facilities such as TimberClick London will also be able to machine to your specific requirement.