Doing your research on costings means you won't either spend to much or worse run out of cash for the project. Again maybe tripple it, i don't want to put you off, but it adds up quickly, even things like rubbish removal, paint, door knobs stuff you didn't think of adds up fast.
I can't emphasise enough how mysterious renovation costs are. I allowed what I thought were really generous allowances for everything, and it cost more - even though I got the builder and main subbies (electrician and plumber) to help me estimate the costs. You truly will be staggered how many "little things" add up.
Also, learnt to get recommendations for tradepeople rather than look in the Yellow Pages.
Great tip. If you've got one tradie you're happy with, ask him for recommendations, as they'll probably recommend people with a similar work ethic/quality. And if they like working together, it's more incentive for them to turn up.
Everything costs more than you think it will
You'll always forget *something* (yesterday we got some plasterboard delivered, we've got fill, we've got adhesive, we forgot tape)
You always need more no more gaps than you think
Things take longer than you hope
I can see you speak from experience! All this is true, but in addition to "no more gaps", I'd add masking tape, measuring tapes (where do they all go?), sandpaper, paint, and energy, patience, stamina, fortitude, and self-control.
* Make sure you know exactly what you need permits for, and what you don't, and that you have them all applied for in plenty of time.
* Make sure you're properly insured during renovations - both for your contents, for the tools on site, for the work being done, for any damage caused by you or your workers to neighbouring properties, etc.
* Keep on top of accounting for costs as you go - it's a nightmare to reconstruct later from piles of receipts! And if you can, pay for everything with one credit card or account, and nothing else - it helps double-check you've remembered every cost in your accounting.
* Use uni students for unskilled/low skilled labour, such as removing rubbish, some prep work (eg washing walls), maybe painting if you have confidence in their skills and/or unfussy about finish, etc. If you employ them, rather than your builder, make sure you buy a workers' compensation policy from your state government (costs very little, < $100) which will even cover day labourers (ie not formal employees) working for you on site.
* If your works are likely to affect your neighbours in any way - noise, traffic, dust, etc - then make sure you've met them and explained what you're doing before you start, and
try to keep them on side. Complaints from neighbours to Council can cause grief. Even if you've tried to do everything by the book, complaints will cause their inspectors to look hard for something wrong, and despite your best efforts, there'll probably be
something that isn't quite right, and it could be expensive. (In my case, they found a window - existing when I bought the property, and which I wasn't touching with my renovation - which didn't have an approval, and it cost me about $15K in architects, certifiers, and delays to get it approved.
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