its not so much safty, you cant explain to him what is happening, he wont understand the noise.
does he startle easilt, get stressed by fierworks, loud TV. you dont want him stressed, it might creat problems he has never had before, like barking all day long when your out, chewing things, ripping things apart, not wanting to leave the house, becoming overly sensative to noise. barking in the middle of the night at any noise, change his behovur to people entering the house.
personaly i would realy want him to go stay atleast next door or with a falily frieand for a couple of hours atleast till they are done.
if you must leave him perhapst pot him in a room further from where they will be working, leave the TV or radio on for him. stuff a konck with some soft cheese, tind dog food, anything like that and freez it then takeing out for him just before you leave. anything that migh help him take his mind off the noise.
he may well not be bothered, but i would rather not chanse it