Hello,
We are renovating our house and initially had plasterboard going on all walls. Since the contract was signed we decided to get Hardiegroove wallboard installed to one of the walls in lieu of plasterboard, which is 16.47m2 in total. After the work has been completed the builder has advised us this change cost $1778 on top of what it would have cost us to install plasterboard, which I find hard to believe. They stated that Hardiegroove is much more labour intense and requires more screws (fixing every 200 mm, plasterboard every 300mm). Does anyone of you know how much time would take to install and flush plasterboard for that area vs Hardiegroove? I calculated Hardiegroove material cost to be approx $51/m2. There is one door, 1 light switch, 3 GPOs, sheet height matches the ceiling height and only one sheet had to be cut for the doorway.
Thanks in advance!