Te Whakaruruhau Waikato Women's Refuge currently manages five safe houses, supporting 65 women and their children from all ethnic backgrounds from throughout the Waikato region.
Refuge chief executive Roni Albert thanked Refuge chair Annah Stretton for calling in every contact she had to get help to finish the project.
"This home will accommodate up to five families - that's legally - and give them a chance to work towards living without violence," she said.
She called for new government legislation which would allow women to leave violent relationships.
"Stop holding her responsible for not being able to protect her kids, or imposing consequences on her for damages she did not do, or expecting every women should have the strength or confidence to walk away from an abusive relationship."
Former Refuge user Taydia Heta-Morris spoke at the opening ceremony, emphasising the importance of similar buildings and the service they provide to help women escape abusive relationships.
"I wanted out but I didn't know how. I didn't know how to get out. I went to rehab in Auckland and came back down to Hamilton. After a while I was able to let go of the drugs but I wasn't able to let go of the relationship."
Ms Heta-Morris said she had hope for her future now which she never had before.
"I wouldn't be where I am today without their help, especially from Roni. They loved me until I could learn to love myself."
The most recent house has taken several years to complete due to funding difficulties, and provides 10 bedrooms.