Affiliate Marketing Secrets

Hello,
I live in 3 bedroom house consisting of ground floor ( kitchen, dining room, bathroom ), staircase to 1st floor ( street level ) bedroom, lounge, staircase to 2nd floor ( 2 bedrooms ).
Unfortunately we have a boiler in bedroom on the 1st floor, with no option to move it ( has been installed there by previous owners of the house ), because this room is above kitchen and next to staircase to the ground floor, there is a room in the wall we have this boiler and one of the boys is complaining of the noise the boiler makes when starting up heating water in the morning. ( starts at 5am due to shift work ).
Is it possible to sound insulate the niche by some board ? is it allowed ? The niche is sort of prism approx 2,5 x 2,7 x 2,7 feet.
thanks for your help