Information about specific planning requirements if you are wanting to build an additional small residential unit on your residential zoned property.
A minor residential unit is a small self-contained, detached building that is intended to contribute to a range of housing choices within the District.
The Christchurch District Plan recognises that small residential units can be accommodated on existing zoned properties of a certain size that already contain one existing residential unit, without affecting the character of the area. These units are eligible for some exemptions from the usual rules for residential units in the residential zones where they are permitted.
To qualify for these exemptions minor residential units must be detached from the existing residential unit and be the following size:
|Zone||Size of minor residential unit|
Residential Suburban, Residential Suburban Density Transition, Residential New Neighbourhood, Residential Banks Peninsula, Residential Hills, Residential Large Lot, Residential Small Settlement
35-80m2 gross floor area
In the Residential Suburban, Residential Suburban Density Transition, Residential Banks Peninsula and Residential New Neighbourhood zones the existing site containing both units shall have a minimum net site area of 450m2. In the Residential Hills zone the site must have a minimum net site area of 650m2. In the Residential Large Lot zone the site must have a minimum net site area of 1500m2 – 5000m2 depending on whether the site is located within an overlay area – refer Rule 126.96.36.199 of the District Plan. In the Residential Small settlement zone the site must have a minimum net site area of 1000m2.
The parking areas of both units must be accessed from the same access. The minor residential unit must provide one parking space and the existing residential unit one or two, depending on the size of the unit.
On sites in the Residential Suburban, Residential Suburban Density Transition and Residential Banks Peninsula zones there must be a total outdoor living space on the existing site (containing both the units) with a minimum area of 90m2 and a minimum dimension of 5m. This total space can be provided as:
If the site is within a Character Area overlay, additional rules apply and a resource consent will be required if the minor residential unit is:
Minor residential units must meet the built form standards for residential units other than those relating to site density and outdoor living areas or resource consent obtained for any non-compliance. Minor residential units must also be a maximum height of 5.5m and single storey only in the majority of zones.
There are no limits to occupation of the minor residential unit i.e. it is not restricted to dependent relatives or older persons and no encumbrance is required to be registered on the title.
There is no specific provision in the District Plan for subdividing minor residential units from the primary residential unit. This means that resource consent would be required to do this, usually as a non-complying activity due to the inability to meet the minimum net site area requirements for standalone residential units.
There is still the ability to construct a family flat in conjunction with a residential unit in all residential zones. Family flats are different from minor residential units in that they must only be occupied by family member/s who are dependent in some way on the household living within that residential unit. This requirement is secured by an appropriate legal instrument on the title of the site which ensures that the use is restricted in this way.
Family flats can be attached or detached and are considered to be part of the residential unit on the site. They must comply with all the built form and other standards for residential units in the zone in which they are located. If the family flat is no longer required by the dependent relative, it must be removed from the site, have its kitchen removed or otherwise demonstrate compliance with the requirements for a minor residential unit if it is located in a zone where minor residential units are permitted.
A minor residential unit is considered to be a development under the Council's Development Contribution Policy 2015 and is therefore subject to a development contributions (DC) assessment. A minor residential unit is however entitled to have the benefit of the small residential unit adjustment which can reduce the DC requirement by up to 40%. A further 10% reduction can be applied to developments that meet Council's Small Residential Unit Rebate Criteria.
Any applications to develop a new family ﬂat or convert a family ﬂat that did not exist prior to 6 December 2013 into a residential unit will be assessed for development contributions. However, these developments will also be eligible for a small residential unit adjustment.
For general enquiries regarding resource consents please contact the Customer Centre on (03) 941 8999 or email DutyPlanner@ccc.govt.nz.