请问有经验人士，以下box gutter更换和屋顶维修报价合理么？有没有用过的gutter公司推荐以下，坐标墨尔本。谢谢
总报价6300含GST
Box gutter replacement to all box gutters around the property:
-A total of 4 box gutters totaling 31 lineal m
-The removal of existing cappings.
-The removal of existing rusted box guttering.
-The supply and installation of new COLORBOND® box gutter systems.
-New box gutters to be re-leveled as best as possible to prevent standing water.
-The supply and installation of new COLORBOND® water channel into rain
head.
-The re-installation of cappings.
The supply and installation of lead (wakkaflex) flashing to cover ridge line on
slate roof.
-A total of 13.5m supplied and installed.
10yr warranty on workmanship and materials to be supplied upon completion
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