Day instead never had his building work reviewed.
Rather he knew the identification number of a licenced builder and used that number to complete paperwork for the jobs without the builder's knowledge.
In one instance the paperwork was provided to a real estate company for use in the sale of the property.
"Mr Day deceived not only the people who hired him to undertake building work, he fraudulently used another person's details to his own benefit, not considering the impact this would have on them," MBIE's Duncan Connor said.
"This type of offending is undertaken to deliberately mislead people for the individual's own financial gain.
Connor said the LBP scheme was introduced to ensure consumers can make informed decisions about builders when hiring them for more technical building work.
Day's crimes helped to undermine the scheme and bring it into disrepute and would not be tolerated, he said.
"MBIE will not hesitate to prosecute people who commit offences under the Building Act and/or the Crimes Act."
Day will be sentenced in the Christchurch District Court on September 24.