Shay Harrop, the council building services' transformation and change manager, said only certain suppliers were able and available to meet the technical requirements of the Building Consent Authority.
And because there was a shortage of building officials on New Zealand's skilled migrant list, staff were under pressure, he said.
The council looked at open tendering as a way to respond to the BDO review, but the market indicated suppliers were unlikely to respond to a tender process.
Councillors were also told direct procurement of these services would help accommodate city growth and promote safe buildings. Staff would provide letters to suppliers outlining the preferred supplier status, and issue contracts.
Staff would also keep in touch with industry groups like the Building Officials Institute to ensure they were kept up-to-date with all known suppliers.
"There is a strong belief that the council can negotiate competitive rates," the report said.
BDO's review said the council had been averaging double the statutory 20 working days to process consents, with staff turnover of 100 per cent in the building services department over the last two years.
Advantages and disadvantages of direct engagement with suppliers:
- Ability to respond to market
- More likely to meet legal timeframes to issue building consents
- Perceived loss of transparency
Source: Tauranga City Council