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Build a granny flat: step-by-step guide

Last updated: 3 July 2026

This guide provides step-by-step instructions and process stages for building granny flats using the building consent exemption. It clarifies roles and responsibilities for key parties and explains important steps and considerations

Step 1: building work starts

The LBP builder(s) are provided with the plans, specifications and PIM. They carry out, record and certify building work according to plans and specifications, ensuring that all work complies with the granny flats exemption and the Building Code.

Step 2: construction monitoring is ongoing

The LBP site manager carries out construction monitoring throughout the build. The work is monitored at key stages to ensure that it complies with the plans and specifications, the exemption conditions and the Building Code.

Step 3: variations agreed, plans are updated

The homeowner and designer work with the builder to resolve any on-site variations, ensuring compliance with the Building Code and granny flats exemption conditions.

The designer updates plans and specifications to create an accurate record of the building work.

Step 4: project programme is monitored

The LBP site manager and homeowner keep track of progress of the project to ensure that the building work is on track to be completed within the two year timeframe.

Step 5: PIM timeframes are extended

The homeowner understands they need to apply to extend their PIM timeframe if the build is delayed.

An exemption requirement is that projects are completed within two years of the PIM issue date.

The council who issued the PIM makes decisions on PIM extensions. Extension applications must be made while the PIM is still current. 

Step 6: builders provide records to the homeowner

As work is completed the LBP builders involved with the project complete Records of Work for the restricted building work that they carried out or supervised.

They provide these to both the homeowner and the council that issued the PIM. The homeowner also receives certifications from specialist trades (electrical worker and plumber).

Next step: complete a granny flat

Complete a granny flat: step-by-step guide

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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: