# NZ Ceiling Heights: Building Code and Housing Rules

Check the Building Code and the separate housing regulations before choosing a ceiling height. New and existing have specific legal meanings.

- Canonical HTML: https://www.chippy.tools/building-codes/nz/rooms/minimum-ceiling-heights/
- Publisher: Chippy Tools
- Updated: 2026-09-06
- Market: nz
- Code edition / reference: NZ Building Code G5 (1st ed., Amendment 2, 2011); Housing Improvement Regulations 1947
- References: NZ G5


## Check both sets of rules

Do not choose a ceiling height from one headline. Check the code, your plans and the housing rules. Ask the council if you are unsure. Do this before you set the height of the frame.

**G5 Interior Environment** has no general house ceiling-height table. Its Acceptable Solution covers matters such as heating and space in certain buildings. That does not remove other rules for the room or access route.

## What the housing regulations say

[Housing Improvement Regulations 1947, regulations 2 and 10](https://www.legislation.govt.nz/regulation/public/1947/0200/latest/versions.aspx) give house age a set meaning. An **existing house** was built before those rules became law. A **new house** was built after that. A house built decades ago can therefore be a new house for these rules.

Regulation 10 sets these habitable-room heights:

| Category under the regulations | Height |
|--------------------------------|--------|
| Existing house                 | 2.1 m  |
| New house                      | 2.4 m  |

For a sloping ceiling, the height applies over at least half the floor area. Leave out areas below 1.5 m when doing that test. Regulation 2 also includes a kitchen of at least 80 square feet in its habitable-room meaning.

Do not assume an owner-occupied house is exempt. Confirm how the regulations apply to the property and work. Check both the building consent and the housing rules.

## Keep a clear site record

Before you mark the ceiling, note the room use and the height on the plans. Check finished floor layers too. They reduce the space beneath the ceiling. For a sloping ceiling, mark the height zones on a measured plan. Do not use a general room-height example to check stair headroom.

## Sources

- [MBIE G5 current Acceptable Solution](https://www.building.govt.nz/building-code-compliance/g-services-and-facilities/g5-interior-environment/acceptable-solutions-and-verification-methods).
- [Housing Improvement Regulations 1947](https://www.legislation.govt.nz/regulation/public/1947/0200/latest/versions.aspx), regulations 2, 3 and 10.

## Related

- [New Zealand building-code hub](https://www.chippy.tools/building-codes/nz/).
- [NZ stair and barrier rules](https://www.chippy.tools/building-codes/nz/stairs/stair-and-barrier-requirements/).


Sourced from the New Zealand Building Code, © Crown copyright, reused under NZGOAL / Creative Commons Attribution.

This page is general information for tradespeople and is not compliance, engineering or legal advice. Requirements are subject to state and territory variations and adoption timing. Always confirm requirements with your building certifier and relevant state authority.


## Frequently asked questions

### Can I choose any ceiling height for a New Zealand house?

No. Check the consented design and all applicable rules. G5 does not give one general house ceiling-height number. Separate housing regulations also need checking.

### What does existing house mean in the 1947 regulations?

It means a house erected before those regulations were enacted. It does not mean every house that already exists today.

### Does living in my own house create an exemption?

Do not assume that. Ask the council which housing provisions apply to the property and proposed work.