There's no single licensing scheme restricting who can carry out a Healthy Homes assessment in New Zealand. In practice, assessments are typically carried out by property inspection companies, qualified builders, insulation installers, or specialist Healthy Homes assessment providers with experience across all five standards. Landlords and property managers can also assess their own property using the government's published guidance and tools, though the Tenancy Tribunal has consistently treated independent, qualified assessments more favourably than self-assessments, particularly where a technical judgement like heating capacity is involved. Where a capacity calculation has been challenged at the Tribunal, assessments carried out by unqualified people, including family members or the landlord themselves, have regularly been rejected as unreliable evidence.