As others have said the cost/m2 will vary massively depending on the spec you are going for - and the complexity of your build - sloping, access, 2 storey, non-std shaped home etc
It will also depend on how much work there is in your neck of the woods - ie. supply and demand.
I understand this is driving m2 rates up in high demand areas like Akl, Tga etc.
So rates could vary anywhere between $3k to $5k+ for the build alone depending on the above.
Other things to consider/not forget about these as many will be in ADDITION to the above:
- Earthworks can be very exp / retaining etc.
- Ditto landscaping depending on what you want the builder to do vs what you may do yourselves - later - planting, lawn, paths, driveway, patios, decks, garden shed, letter box, washing line etc (as many of these may not be in the std spec).
- What services/utilities do you need to fund - water, power, sw, sewer?
- Council fees - eg. BC, RC and Development Contributions?
- Legal costs?
- Valuation costs ie. will your bank require these in order to release payments?
- Check the builders STD spec - not what you may have seen in a show home, as they tend to be higher specced. As you may well want to upgrade against the std spec. This will of course cost $$. We upgraded many items - kitchen, bathroom (showers, tiling), electrical allowance, bench tops, flooring, cladding, windows and doors to bi-folds, garage door, extended eaves for passive cooling, increased insulation, network, AV gear cabling, HT room, external garden lighting, spa cabling etc, etc.
- Try and pin down as many PS's as you can and get these converted to LS's - in order to reduce potential unforeseen overruns.
- Do some of your own price checking for big ticket items as you may well be able to get them cheaper than the builder will supply eg. for us the wood burner, whiteware, timber flooring, carpet, granite bench tops/plinth etc - we could all get cheaper.
- Get a design and price you are happy with before you sign up. DO NOT MAKE CHANGES AFTER THIS AS IT WILL COST YOU DEARLY.
- Consider what other stuff you may need to fill out your home - esp if it has more rooms.
- Allow a contingency.
Do your due diligence on the builder - quality of work, duration of company, who will be the PM etc. Seek out recent customers if possible - look at their homes - ask them about their exp and how the process worked for them - warts and all.
Ensure you get a good contract in place - one that looks after YOU (as it will be drafted to favour the builders interests). Ensure you have it reviewed by a lawyer or someone in the know - look for a completion date, liquidated damages clauses etc to keep them on their toes, payment clauses that align with your banks needs etc.
Negotiating? - Right now the builders probably have the upper hand - so good luck with that : /
And finally - hope it all goes well!!!