Standard timber sizes are as follows
TR26
35×72 47×72 35×97 47×97 35×122 47×122 35×147 47×145
47×175 47×197 47×223 47×247 All the above come in stock lengths from 2.4m 6.0m (0.6 increments)
CLS grade C16 (we would typically use this for timber frame wall panels)
38×63 38×89 38×140
The above is stocked as 4.8m lengths
Glulam grade C24
90×315 90×360 90×405 90×450
115×315 115×360 115×405 115×450 115×495 115×540 115×630
140×315 140×360 140×405 140×450 140×495 140×540 140×585
Sheet materials
11mm OSB sheathing 1.2×2.4 15mm Bitroc 12×2.4 Weyroc Chipboard 2.4×0.6 Plywood 2440×1220
Flooring: 22mm Egger Protect P5 chipboard