The city has withdrawn plans to extend national medium-density standards across more suburbs, so what you can build depends on your site

Two Christchurch sections a few streets apart can now come with very different possibilities. That follows the city’s decision to withdraw the remaining parts of Plan Change 14 that would have extended the Medium Density Residential Standards (MDRS) across more residential areas. The national standards would have allowed up to three homes of up to three storeys on many residential sites without resource consent, subject to other rules and qualifying matters.

In September 2025, Christchurch City Council voted to ask the Government to let it withdraw the undecided parts of its housing plan change. The Government approved the request in November, and the council formally withdrew those parts shortly afterwards.

The council could withdraw because it had already zoned enough land for growth. Legislation passed in 2025 allowed withdrawal if the operative District Plan had enough feasible housing capacity to meet 30 years of adjusted demand.

This was based on high-growth household projections, with an additional 20% of demand. Christchurch’s assessment put the required capacity at about 65,600 homes.

Where the density goes

Christchurch retained medium-density zoning around the central city and a range of suburban centres and surrounding areas. The amount of medium-density zoning increased by about 50% compared with the pre-Plan Change 14 position, covering almost a quarter of the city’s residential zones. Elsewhere, existing District Plan rules continue to apply.

Stats NZ figures for the year to August 2026 show Canterbury consented 8,933 new dwellings, up 35% on the previous year and the region’s highest annual total in at least a decade. Christchurch accounted for 4,904 of them, up 31%. Selwyn consented 2,420 new homes, up 62%.

It also had the country’s second-highest rate of new homes consented per 1,000 residents, behind Queenstown-Lakes. Waimakariri consented 820, up 20%.

Cross the city boundary and the rulebook changes again. Selwyn and Waimakariri operate their own district plans, so developers must check the rules applying to each property.

Small homes, separate rules

Since January 2026, an eligible new, stand-alone, single-storey home of up to 70m² can be built without a building consent if it meets the exemption’s conditions. The owner must obtain a project information memorandum (PIM) from the council before work starts. Relevant work must be carried out or supervised by appropriately licensed building professionals.

The owner must also provide the council with the required completion documents within 20 working days of finishing. No building consent or code compliance certificate is issued under the exemption, but the dwelling must still comply with the Building Code and other applicable rules.

Two further conditions are worth checking early. The site must not be subject to a natural hazard identified by the council, unless adequate provision has been made to protect the land and the building.

The home also can’t be built across the boundary between two or more existing allotments. An owner who fails to send the required completion documents on time commits an infringement offence and can be fined up to $1,000.

Changes that took effect on 8 October 2026 allow eligible certified composite structural products, including some structural insulated panel and solid timber systems. The changes also clarify when existing water, wastewater and stormwater connections can be used, subject to the relevant requirements and available capacity.

Before you draw anything

Finding out what your site allows comes first.

· Check the council’s current District Plan maps and property search to identify zoning and relevant rules.

· Check site constraints and planning requirements early. A PIM is required before construction under the granny-flat exemption, but doesn’t replace other approvals.

· Find out whether water, wastewater and stormwater arrangements can accommodate another dwelling.

· Work with professionals familiar with the relevant district plan. Identifying problems early can cost far less than discovering them during the consent process.

Zoning determines what may be possible on a site. Local professionals can help turn those rules into a workable plan.