input credit on works contract for office /home renovation

hiii i have client who is engaged in interior designing & has bagged home/ office renovation contract
he is registered himself under gst sac 995419 for works contract.

now he purchases materials, plywoods for furniture, decorative item from a sub contractor in his name and than bills the final product prepared to client aftr adding his margin..

1) can he now claim Input Credit on materials, plywoods, etc. bought by him for his works???

2) does he require to register under goods section in GST for the items he bought for works contract...???

pls help....