"If you focus on one group for a 12 months period you can go hard, and build, and support."
He's had a full-on year and needs a rest. After a summer break in "sandals, shorts and T-shirt" he'll begin the new role in late January or February next year.
He's cleared it with the board of his Castlecliff trust. It will find other people for administration and projects.
Mr Warahi first got involved with the Matipo trust in 2014, helping with governance training and getting it charitable status. He continued to mentor it last year.
It has been offering education to Whanganui families and whanau affiliated with the Black Power gang.
It was a winner in the Trustpower community awards in October last year, for its work to improve the lives of people in the Matipo St area of Castlecliff-Gonville.
One of the prime movers was Craig "Rip" Rippon, who was murdered on November 8. After his death the work continued, with the help of Rotary, the YMCA, the Wai Ora Christian Community Trust and Whanganui UCOL.
Mr Warahi has been blown away by the successes achieved - qualifications in literacy, numeracy, horticulture and carpentry. The trust's current chairwoman is Rosemary Rippon.
Both the foundation and Mr Warahi want whatever is achieved to be long-term. He's envisaging reverting to a mentoring role with the Matipo trust in 2018.
The Vodafone New Zealand Foundation has been funding community organisations since 2007. It has given out $20 million in grants so far, all aimed a helping youth.
Award recipients receive ongoing mentoring and attend hui both during the year of the award and afterward.