Hardwood Beam Sizes

Suggested Sizes:

The table below shows common lumber sizes used in British construction along with suggested lengths that are often use for lintels, beams and posts. Durable posts in oak, alder and sweet chestnut are likely to be sought for timber traffic signs etc.

Beam Dimensions Hardwood Beam Sizes – Length (m)
Depth (mm)	Width (mm)	1.5	2.0	2.5	3.0	4.0	5.0	6.0	6.5	7.0
100	100	X	X	X	X
120	100	X	X	X	X
120	120	X	X	X	X
150	100	X	X
150	150	X	X	X	X
150	215	X	X
150	300	X	X	X
215	100		X	X	X	X	X
215	215		X	X	X	X	X
215	300		X	X	X	X	X
250	100			X	X	X	X
250	215			X	X	X	X
250	250		X	X	X	X	X	X
250	300			X	X	X	X	X
300	215				X	X	X	X
300	250				X	X	X	X	X	X
300	300			X		X	X	X	X	X