the flooring supports/joists in our whole bottom floor were rotten/wood worm riddled. we were removing the back of the house so that got rid of half the job in one fell swoop - replacing unsalvageable joists and treating the others cost about 1500/2000 I think. that's for a 1920s 3-bed terraced house so not a massive footprint - and we have easy access to the subfloor due to having a basement/underhouse
the flooring supports/joists in our whole bottom floor were rotten/wood worm riddled. we were removing the back of the house so that got rid of half the job in one fell swoop - replacing unsalvageable joists and treating the others cost about 1500/2000 I think. that's for a 1920s 3-bed terraced house so not a massive footprint - and we have easy access to the subfloor due to having a basement/underhouse