Abstract: A support for layout lines utilized in laying out construction sites. The support is slidably carried on a stake and includes a clamping bolt to fix it in position on the stake and to allow it to be moved along the stake for adjustment purposes. The support includes a transit pole tab, on which the bottom of a transit pole can be placed for positioning purposes, and a tab for supporting a layout line platform. A clamping member, such as a thumbscrew, is carried in a bracket and overlies the platform to allow the thumbscrew to clamp the layout line in position against the upper face of the platform, which can include a groove or slot for receiving the layout line. The upper surface of the transit pole tab lies in the same plane as the upper surface of the layout line platform.