The Short Answer
In Christchurch, you don't need a building consent for a deck if it meets both of these conditions:
- The deck is no more than 1.5 metres above the ground at any point
- The deck area is no more than 20 square metres
If your deck exceeds either of those thresholds, even slightly, you need a consent from Christchurch City Council before you start building.
Why It Matters
Building without consent when one is required is a serious problem. The council can issue a notice to fix, which means you may have to open up the structure for inspection or, in the worst case, remove it entirely. It also creates issues when you sell: a non-consented structure has to be disclosed and can stall or kill a sale.
Beyond the legal issue, consents exist for a reason. Elevated decks need to be structurally engineered. The consent process checks that your deck won't collapse under load, that the fixings are correct, and that the drainage won't cause water damage to your house.
What the Consent Process Looks Like
For a standard deck in Christchurch:
- Application: we prepare drawings, specifications, and a producer statement. You lodge through the CCC online portal or we lodge on your behalf.
- Processing: council has 20 working days to issue a decision. Most straightforward deck consents come back in 10–15 days.
- Inspections: typically two: a framing inspection before the decking goes down, and a final inspection when the job is complete.
- Code compliance certificate: issued after the final inspection passes. This is the document that confirms the work is legal and is what you'll need at sale time.
Consent fees in Christchurch are currently around $1,200–$2,500 for a typical residential deck. We include these in our quotes so there are no surprises.
What About Pergolas?
A pergola attached to your house is treated as a building and almost always requires consent, regardless of size or height, because it attaches to the building structure. A freestanding pergola under 10m² may be exempt, but check with us before assuming.
Decks on Sloped Sites
Christchurch has a lot of sloped sections, particularly in the Port Hills and hill suburbs. A deck that's ground level at the back of a house can easily be 2 metres or more above ground at the front edge. Height is measured from the lowest point of the deck to the ground below, so slope is a common reason a deck that looks modest still needs consent.
We Handle the Consent for You
At Ecocare, we manage the full consent process, drawings, application, council correspondence, inspections, and code compliance certificate. You don't need to deal with the council directly.
When we quote your deck, we'll tell you upfront whether consent is required and include the cost in the quote. No hidden costs at the end.
Get in touch for a free quote and we'll give you a straight answer on consent from the start.