Working From Home — Consenting a Home Clinic in New Zealand

More people are starting to use part of their home for work. Sometimes this decision is driven by cost, sometimes by flexibility, and often simply because the space already exists — a spare bedroom with a separate entrance, a room that could function differently. At first, it can feel like a small change because you’re not building anything major. But once clients start coming into the space, it’s no longer just an interior update. You are changing how part of the house is used, and that means certain rules start to apply.

In planning terms, living in a house is defined as a dwelling. Introducing a business in your home creates what is called a home occupation — an activity that remains secondary to residential use. Most councils, including Auckland, allow many home occupations without requiring Resource Consent, provided the activity stays low impact. This usually means limited staff, minimal traffic, low noise and no visible commercial character. Professional services, therapy, tutoring and small treatment practices often fall comfortably within this category.

Where the process becomes more technical is under the Building Act. Even small-scale business activity can trigger what is known as a change of use. This does not mean the house becomes a commercial building, but it does mean that the part of the house used for business must meet Building Code requirements relevant to that new activity, as nearly as reasonably practicable. This principle sits at the centre of most home clinic projects because it recognises the reality of existing buildings while still requiring risk to be assessed.

My recent project converting an existing bedroom into a small treatment practice illustrates how this works. The room planned for the new treatment space was created as part of a 2022 extension, which had already been approved under Building Consent and a Code Compliance Certificate was issued. The proposal did not involve any structural work, footprint changes or alterations to the building envelope. All changes related only to the internal layout required to accommodate the treatment equipment and supporting facilities. Although the physical changes were minor, the intended use of the room changed, which meant the space still needed to be assessed under the Building Code. Section 115 of the Building Act 2004 states that where a building, or part of a building, changes use, the building must comply — as nearly as is reasonably practicable — with the Building Code provisions relevant to the new use. The Act provides that a building consent authority must be satisfied that the building, “in its new use, will comply, as nearly as is reasonably practicable, with the provisions of the building code that relate to means of escape from fire, protection of other property, sanitary facilities, structural performance, and fire-rating performance.”

Section 112 of the Building Act is also relevant where alterations are undertaken to an existing building. It requires that, following the alteration, the building continues to comply with the Building Code to at least the same extent as before, and that the building consent authority must be satisfied that, after the alteration, “the building will comply, as nearly as is reasonably practicable, with the provisions of the building code that relate to the means of escape from fire and access and facilities for persons with disabilities.”

Where the new use involves public access, Section 118 and Schedule 2 introduce additional considerations relating to access and facilities for persons with disabilities, again subject to the reasonably practicable threshold. So, once change of use is identified, two areas almost always become central to the assessment: fire safety and accessibility.

In a standard dwelling, fire design is based on residential use — typically classified as Risk Group SH, which assumes sleeping occupants within a single household environment. The expectations focus on domestic smoke detection, simple escape routes and household-scale risk. When part of a home begins operating as a clinic or business space, even at a very small scale, the activity is no longer assessed purely as residential. A treatment room, consulting space or similar activity is typically classified under a different risk group, such as Risk Group CA (care or service) in our case. This shift does not automatically mean extensive upgrades are required, but it does mean the fire safety must be reviewed.

The assessment considers occupant load, whether users are awake and mobile, the clarity of escape routes, and whether the space functions as a separate firecell. In many home clinic scenarios the outcome remains proportionate, however the review itself is essential because the Building Code evaluates risk based on how a space is used, not simply where it is located.

Accessibility is the second major area that arises once public access is introduced. The requirement to consider accessibility sits within the Building Act but is strongly influenced by the broader intent of the Human Rights Act, which aims to prevent discrimination against people with disabilities. In practical terms, this means that when a service is provided to the public, designers and building consent authorities must consider whether people with disabilities can reasonably access and use that service.

Importantly, accessibility requirements are assessed through the “reasonably practicable” lens for existing buildings. The legislation recognises that full accessibility upgrades may not always be achievable without disproportionate structural intervention, particularly where works are minor and limited to a small part of a dwelling. The key requirement is that accessibility is actively considered, documented and justified, rather than assumed to be unnecessary.

Coming back to my project, both fire safety and accessibility were addressed through formal assessment. For fire safety, Concepts and Consents prepared a dedicated Fire Safety Report to evaluate how the change of use affected the existing dwelling. The analysis focused on the scale of the activity. The room was small, with a maximum of one practitioner and one client present at a time, resulting in a very low occupant load. The space had its own independent external entrance and a short, direct escape path to open air. Users were awake, mobile and capable of self-evacuation. These factors are critical in fire design because the Building Code assesses risk based on occupant characteristics and escape complexity rather than building type alone.

The fire report therefore established that the treatment room could be considered a separate firecell for functional assessment, but that the conditions that typically trigger fire-rated construction were not present. The building is single storey, the occupant load is minimal, and no sleeping or vulnerable occupants are introduced within the treatment space. As a result, extensive passive fire upgrades were not required.

Instead, the strategy focused on proportionate measures: confirmation of compliant smoke detection, review of means of escape, occupant load assessment, and evaluation of external wall proximity and unprotected areas. The documentation intentionally exceeded minimum information requirements to provide clarity for Council and demonstrate that the change of use did not introduce additional life-safety risk.

Accessibility was addressed through a separate ANARP analysis. The starting point was the legislative requirement under Section 118 to consider access and facilities for persons with disabilities where reasonably practicable. Rather than assuming accessibility upgrades were not required, the assessment examined the nature of the service, the physical constraints of the existing building and the scope of the proposed works.

The analysis recognised that the treatment itself requires independent mobility, physical positioning and direct practitioner interaction, meaning the service is inherently limited to clients who are able to transfer independently. It also considered that the proposal involved a minor internal alteration within an existing building and that providing full accessible access would require significant structural modifications beyond the scope of the works.

The documentation demonstrated that the new activity did not introduce additional life-safety risk and that accessibility had been properly considered within the constraints of the project. Following review of the submitted information, Council was satisfied that the proposal met the relevant Building Act requirements and Building Consent was granted.

This outcome reflects a broader reality for home occupation projects. Small clinics and similar professional activities can often be accommodated within residential buildings without extensive upgrades, provided the change of use is recognised early and supported by clear assessment.

Home occupations are likely to continue growing as more people choose flexible ways of working. When approached thoughtfully, they remain entirely achievable within the existing regulatory framework. Understanding how the Building Act applies, and documenting fire safety and accessibility appropriately, allows these projects to move forward with confidence while maintaining the safety principles that sit behind the Building Code.