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IMO the trouble is that 'good' is quite hard to discern.
They might be punctual, polite, neat and well priced but it doesn't mean they've done a good job.
Would suggest a read of this https://www.thepebbletrust.org/wp-content/uploads/2023/08/230814_SRG-ed2_Digital-V2_compressed.pdf
To help inform what it is you're asking for because insulating floors and lofts in older buildings in particular needs to be done sensitively to avoid problems with moisture/damp/mold.
Anyone have any recommendations for trades to fit insulation - both under floorboards and also probably loft?