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Look at Silvatimber or Southgate Timber (my fave supplier) - for larch or maybe cedar. Larch is cheaper and paler in colour - think about finish too. Sioxx is the best (from russwood) to pre-weather to a silver grey, but there are plenty of options.
Id personally avoid general treated softwood cladding for a house - too much shed vibes and often shit quality but - Chesham timber do good feather edge barn cladding.
Cedral click smooth maybe worth a look (fibre cement). Which would quicker on account of no oiling / painting required.
If its just the ground floor you are cladding you'll need to think about a cladding head detail to flash into what ever is above and provide a vent to the battened cavity. Also consider insect mesh. We had wasps behind our cladding and they ate through the ceiling into my kids bedroom !
the back of our house has previously been rendered in sand-cement on the ground floor, and time plus putting in new openings mean it's a horrible cracked patchy mess.
don't have the money to get it re-done professionally or even patched up at the moment - but would rather hack it all off and essentially start again.
in a perfect world i'd get the whole back of the house externally insulated and k-rend'd (or similar) but again money is beyond tight now (narrator: the extra 5k loan to finish the renovation did not finish the renovation)
besides teaching myself how to render, preferably with lime, anything else that's cheap and effective? some kind of cladding that can be cut and screwed and doesn't cost the earth? cheaper/DIY version of some Russwood type stuff?