Key things to think about...


This is what we've heard from the community so far…have we got this right? 
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Identify early on if you need a new septic system. If you are adding a second bathroom, this isn’t always the case. If you do: design to allow for the tank and effluent field (there have been recent changes in rules in terms of space required from the boundary). A starter guide from government is here.
 
Have your boundaries been surveyed? It's recommended before you start building to ensure you are building two metres from the boundary - fencelines are often wrong. Typical costs are discussed here.
 
Consider design options carefully: could this be an extension to your current home (it might be you who gets the new bathroom?!) A new design, or a prefab? Relocating and/or renovating an existing building? Does this dwelling need a full kitchen (This affects council fees). Have you considered a compostable toilet (only drainage needs building consent)?
 
Can you do this in phases to make it more affordable? Bathroom first with connections, kitchen later, for example?
 
Future proofing: what are the potential future needs you can envisage? Elderly and teenage housing? Renting? Downsizing for you? Office/holiday home hybrid? What design features might this entail? e.g. might a loft bed provide space for visiting children? Futureproof for solar power, or mobility issues?
 
Consider carefully the professionals you use, and utilise local knowhow. Getting good professionals involved may save you money in the end. They can often take you through the whole process as well.
 
Consider whether this might be an investment. With renting it’s possible for your additional dwelling to pay itself back over 10 years (based on a 10% of cost rental return).
 
Think about what your needs are first ahead of trying to fit it into the new 70 metre square and under new ‘granny flat’ legislation. It will provide some consent cost savings but restrict design features like a fire or a walk-in shower and restrict you to one level. Here is the official guidance.
 
Many projects will need the involvement of a structural engineer. See here to help you identify this.  
 
Read up about the consent process in the KCDC Additional Dwelling Guide here. From PIM to potential resource consent to potential building consent and signoff. 
 
Check out you and your builder's legal rights and obligations during a build here.
 
Avoid being surprised by hidden costs. Talk to other community members who’ve done a similar project (the housing trust can help hook you up) and it may change your plans. Check out these really valuable slide shows from Homes for Good and KCDC on indicative costs and process.  
 
Book a free meeting with a KCDC duty planner early to assess if you need a resource consent and what permits, but also talk through options with professionals in the community who may advise on a stepped process. Contact here.
 
All building work in New Zealand must meet the performance standards of the New Zealand Building Code, even if it doesn’t require a building consent. You can find these here. If you contract a licensed professional they will ensure you meet building standards. If using a kitset check with your provider what they can guarantee (a bathroom will see licensed professionals needed). Meeting standards and required consents can effect your ability to resell - judge the risks with your eyes open! And make sure the kitset provider meets wind ratings (Wellington has specific requirements).

Additional Dwellings do attract rates. Current estimates per additional dwelling for 25/26 for Kāpiti are approx. $1,500.00 P/A.
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If your dwelling will be used as a rental property, it must comply with the healthy home standards. See www.tenancy.govt.nz/healthy-homes
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When built there’s the question often of who is going to manage the new property. This can sometimes be tricky to do yourself. We offer a property management service with locals looking after locals. See here.
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Finally, the Paekākāriki Housing Trust aren’t the professionals but we can help connect you to the information and people who are. We are publishing six very different case studies to share learned knowledge, can direct you to locals who’ve done similar builds, and are developing a directory of  professionals for you to contact.
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We will continue to add or amend these considerations as we gain knowledge. Thanks!