building permit question

In a bit of a problem

I am an owner builder but have a traddie at the moment giving me a hand with the roofing

The plans clearly state that I use 190 x 45 mgp 12 for rafters but the stuff is hard to get and i cant get the correct lengths.so I want to use LVL instead now

The building permit surveyour is on holidays so my question is do i have to notify him first before i install the different material and thats a drama due to the fact that the traddie helping me is booked out for another five weeks after this week

Any ideas


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