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I can not rememeber I did it a while back while researching.
Does any body own a cavity wall insualtion blowing machine?
Or do you know where a decent / small / and fairly cheap ones are for sale?
It costs in the region of 30k to set up a cavity team - tools, van etc and margins are in the region of 10% that's why you don't see many small insulation businesses, especially now Cert is finishing. You need to be trained to BBA standard which doesn't take long. I believe second hand machines can be picked up for around 10k but you need quite a big van (luton at a minimum) if you're planning to do it for a while because of the weight of the machine.
It's not practical to use an existing van for the machine taking it out when it's not needed - it needs to stay in place, hence the 30k potential set up costs because you need a dedicated van. Most installers use a class 3 van so it can hold enough material for a couple of days on the road. Teams of 2 installers knocking their pan in on average 3 bed houses can install 3 jobs a day but there's not a lot of care taken and they need to be close together.
Loft insulation and draught proofing are a lot lower risk the drop off in insulation once cert is finished is going to be so big that a lot of installers are going to be giving it away to keep staff employed - Fit all over again in the insulation industry.