Most structural work e.g. plumbing/drainage changes where there is no existing fixtures, decks over 1.5m, new windows/doors in bracing walls, etc. need a building consent. In certain minor cases an exemption from consent can be applied for. You’ll need a resource consent if your design breaches the Christchurch District Plan (e.g., setbacks, height in relation to boundary, site coverage) or is in a Character/Heritage area or Flood Management Area (FMA) or digging more than 20m3 outside of the building envelope.

They can restrict building locations and require specific clearances or approvals. Verify easements on the title and locate services before design.

Many small jobs are exempt. Common examples: decks up to 1.5 m high, same-size window/door replacements that don’t affect bracing, non-structural internal linings, and like-for-like bathrooms/kitchens (no new plumbing points). Exempt does not mean DIY - Restricted Building Work still needs LBPs, and council may ask for evidence of compliance later.

At minimum: LIM, topographical site survey, geotechnical assessment (if TC2/TC3 or uncertain), and an asbestos survey for pre-2000 homes.

You can’t confirm asbestos by sight. If your home or outbuildings were built or renovated before 2000, assume risk in materials like textured ceilings, fibre-cement cladding/soffits and “Super Six” roofing, vinyl floor tiles/black adhesive, pipe lagging, backing boards, and some gaskets. Pre demolition surveys by a licensed assessor can help in ascertaining if asbestos is present and help with planning.

Statutorily 20 working days for building consent once accepted, but Requests for Information (RFIs) pause the clock. Your designer will submit complete drawings/specs, geotech and engineering and ideally respond to RFIs quickly to keep things moving. An allowance of 6 weeks in reasonable.