The former director has brought a claim against KA No 4's trustee, which is being heard in the High Court Auckland this week before Justice Helen Winkelmann.
Appearing as a witness yesterday, Hotchin said the trust had ended up with the benefit of the house improvements:
"I believe KA4 Trust has been enriched as a result of the improvements I paid for".
"I never expected to gift these to KA4 Trust," he said.
But an accountant who did work for both Hotchin and the trusts, Dwyane McGorman, today said he believed there was no obligation for reimbursement to be made.
"I don't believe there was ever an obligation for him to be reimbursed," McGorman said.
When KA No 4 took over the completion of the mansion, McGorman said the ownership of the unfinished improvements Hotchin had paid for was a "grey area".
"A view I took was Mark potentially didn't own anything [from the house improvements] at that time because he hadn't fulfilled what he set out to do - which was complete the house - and left that with the trust," McGorman said.
Earlier today, Hotchin was questioned in the witness box by Financial Markets Authority Queens' Counsel, Colin Carruthers.
The FMA is known as "an intervener" in these proceedings and the court heard yesterday how Hotchin and KA4 would have settled the claim if not for the market regulator's involvement.
The FMA has freezing orders over the Paritai Drive property and is taking civil action against Hotchin and five other former Hanover directors or promoters in an attempt to get compensation for the finance group's investors.
Carruthers said during his opening statements this week that because of its claim against Hotchin, the authority has an interest in his asset position.
Carruthers said yesterday that Hotchin's $12 million payment for the construction was an advance from him to KA4.
Hotchin did not agree when this was put to him in the witness box this morning.
The proceedings continue today.