Damp Coming through Floor

anotheruser

We have an extension.
The walls were done with some black breeze block type bricks.
When we moved in, we took up some thin wooden flooring and put carpet in. Underneath seems to be solid concrete.

Only noticed this over the winter but the edges of the carpet are damp.

Outside on one side there are stones with mint planted in them. Along another edge is a bit of compost with some plants in, one edge borders the neighbour and one edge connects to the house.

I have no idea of what the next steps would be. 

1) If we need to put a damp proof course in, I know the price will depend how big the room is (it's an odd shape), but what sort of figures are we looking at? Hundreds or thousands?

We haven't taken the carpet up yet so don't quite know what's going on but I'd guess water from the outside is somehow being sucked up by the carpet?

Appreciate advice on this.

FreeBear

anotheruser said: Outside on one side there are stones with mint planted in them. Along another edge is a bit of compost with some plants in, one edge borders the neighbour and one edge connects to the house.

Standard advice - Has the DPC been bridges by the external soil level & planting ?

Stock answer - Reduce the ground levels externally so that it is a minimum of 150mm below the DPC and install a French drain.

Don't waste money on having chemicals injected in to the walls - The extension will have been built with a DPC, and they do not fail unless it was built by Mr Wayne & Co.