I was building a granny flat and have already paid them $4,000 in plumbing works. The last bit of work left to complete the project was to install a gas flow meter, which I was quoted $170 in writing. Later the quote increased to $315. I didnt want to change plumber as they have done all the plumbing works on this project. We later agreed on a fee to install the gas mater of $300. Job done and paid and my bad not to ask them for a plumbing certificate for the job for the whole project before paying them. I was then forced to pay another $55 for the certificate as requested by the council and reason given by them was I lost money on the gas meter installation. I ended up paying $355 for the gas meter, which is even higher than the revised quote of $315. In terms of the standard of plumbing works, they are barely acceptable.