This is biggest one I have caught so far:
They would occasionally walk into my house and wait for the night to go out and about.
With the limited info and only a side image (top/bottom photos more helpful for ID), it's hard to pinpoint a specific species. To complicate matters, Manaaki Whenua Landcare research suggests:
Over 90% of New Zealand spiders are endemic, the rest are natural introductions through windborne or human activities. The species we frequently see around are houses and gardens are usually introduced species. Most of the endemic species are restricted to native habitats, from forest to alpine regions
One possible group are the sheetweb spiders (family Stiphidiidae).
According to Wikipedia, most species are speckled brown with long legs with a body length < 2.5 cm and leg-span < 15 cm. This family of spiders is nocturnal, and they can be found in gardens or (ales) even enter homes.
Here's an example specimen from this family:
Source: Manaaki Whenua Landcare research
According to Arachne.org.au, the Stiphidion genus is the most commonly seen group from this family.
Credit: Dr Greg Anderson, Source: Arachne.org.au