The evidence is piling up when it comes to shoddy building work in Auckland.

This week we've seen Auckland Council prosecutions for shoddy building work without consents, and Newstalk ZB's heard from members of the public who've been affected by their neighbours doing work including demolition without permission.

Now, two licensed building practitioners have been fined by their industry body and had their accreditation cancelled for incompetent work.

In the first case, the Building Practitioners Board says Aucklander Hao Zhang displayed a serious lack of care and competence in constructing a retaining wall.

It's found he showed a flagrant disregard for the law by not getting consents, despite his extensive knowledge of the process.

Zhang was fined 25 hundred dollars, had his carpentry and foundation licence cancelled and name removed from the Licensed Building Practitioners register.

The complaint related to the construction of a specifically engineered retaining wall.

The Board said that Zhang failed to understand the potential ramifications of his decision to cut reinforcing steel off to fix an error.

He also drilled and placed new starter bars in the foundation without any form of bonding to the concrete.

Zhang failed to consult with the engineer or the designer and instead continued with a solution that did not meet the required performance factors for the retaining wall to be constructed - something the board says displayed a serious lack of care and competence.

In the second case, a builder whose name has been withheld, was fined three thousand dollars and ordered to pay costs for negligent and incompetent work that also didn't comply with consents.

He was also found to have brought the regime for LBPs into disrepute.

The Board found that he showed a “flagrant disregard for the law by not uplifting the building consent and for the requirement for resource consent despite his extensive knowledge and experience of the building consent process”.

Registrar of LBP’s Paul Hobbs says both cases highlighted the importance of builders' obligations leading to public confidence in the scheme.

“It’s imperative to the overall regime’s success that people who are licensed are seen to be playing by the rules and not adopting a different set when it comes to their own work,” he said.

A guide to making a complaint about a licensed building practitioner is available from the Boards website located at www.lbp.govt.nz.