Retaining wall for garden room - worried

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6 Feb 2026
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Hi guys
Very new to this but wanted some opinions and answers. Long story short, building a garden room.
Concrete base poured 200mm, floating with dpm and a142 reinforced.
Built a retaining on top to hold back next doors field. The field slopes away from our boundary is about 1m high, we’ve installed a french drain and back filled with gravel. The wall is 5.5m long. Pics attached.
The retaining wall is black jacked, and going to be used as the the wall for the room. Concrete wall has been built round, but no DPC has been installed by the builder. Timber frame is going on top. what can I do to counter act no dpc on the brick course? Should I also black jack that whole back wall on the inside?
 

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