Short answer: Apply through your provider with a sale and purchase agreement. Money goes to your lawyer. Allow 2-3 weeks.
You apply through your KiwiSaver provider, not the government. They need a sale and purchase agreement and a letter from your lawyer. The money goes straight to your lawyer, not to you. It takes 10-15 working days. Do not wait until the last minute.
Step1: Sign sale and purchase agreement
Step2: Contact KiwiSaver provider for withdrawal forms
Step3: Lawyer completes statutory declaration
Step4: Submit to provider
Step5: Provider pays lawyer directly at settlement