"Dpc" level with externall Path

[LAB]

1950s house, need to demolish and new build lean-to, house finish floor in to lean-to is only about 50mm above external concrete path, I will need, I assume 150mm, only remedy is to lower the path, this is not an option, not sure if there is DPC, help please

[welsh brickie]

you need to install a drainage system, ACO for example supply the ideal system for your needs.

[LAB]

Thanks for that advice, I have heard that 450mm cavity tray will do.
Diolch