Acro Props (removing ext wall)

Hi, I am planning the fitting of a roller door to the rear of our garage to improve access to the rear yard. (I will have the actual door professionally installed - the firm quoted $80 which I think is reasonable). The house is 1 year old and is single storey, brick venear with timber stud load bearing inner walls. I presume that before removing the inner timber leaf wall and inserting a timber lintel (will match the size of the engineered ply lintels that the builder used over the front...

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