Field-tested technical guides, Australian Standards breakdowns (AS 1684, AS 3008, AS 3500, AS 5601), and ATO tax strategies for Aussie tradies and subcontractors.
Master AS/NZS 3000:2018 maximum demand calculations for Australian homes and switchboards. Complete Table C1 diversity factors, step-by-step single & 3-phase worked examples, EV charger rules, and 3-phase upgrade triggers.
Quick-reference sizing guide for Australian split system air conditioners (2.5kW to 10kW). Complete sizing chart for Type C circuit breakers, 2.5mm² vs 4.0mm² cable, AS/NZS 3000 Clause 4.19 outdoor isolator rules, and voltage drop limits.
Do you need council approval for a retaining wall under 1m in Australia? Learn the real NSW 600mm exempt rule, Victoria 1m limits, boundary setback laws, surcharge load triggers, and AS 4678.
Australian builder guide to NCC 2022 stair regulations. Learn the 2R + G formula, max 190mm riser / min 240mm going limits, stringer throat math, 125mm open riser rules, and how to avoid certifier fails.
When should you oil a new Merbau deck in Australia? Learn why oiling too early ruins your finish, the 30-second water drop test, and how to fast-track tannin removal in 48 hours.
What size gap between Merbau decking boards? Learn exact mm spacing for 90mm & 140mm wide boards, how to lay, screw fixing rules, and avoid deck cupping.
Burying H3 treated pine in soil causes rapid rot and termite failure within 2 to 5 years. Learn why AS 1604 prohibits H3 in-ground, how H3 compares to H4 and H5, and how to set posts correctly.
Complete guide to electrical cable selection in Australia under AS/NZS 3008.1.1 and AS/NZS 3000. Master the Three-Check Method: current capacity, voltage drop limits, fault loop impedance, derating factors, and earth conductor sizing.
Australian plumber guide to minimum drainage gradients under AS/NZS 3500.2. Sizing rules for 1:40, 1:60 and 1:100 fall, self-cleansing velocity, bedding depths and inspection tips.
Step-by-step guide to calculating Floor Load Width (FLW) for subfloor bearers and joists under AS 1684.2. Sizing formulas for single vs continuous spans, cantilevers, and MGP10/F7 span tables.
Complete guide to calculating your tradie & contractor hourly charge-out rate in Australia for 2026. Real billable hours, business overheads, ATO tax brackets, 11.5% super, and trade rate benchmark tables for chippies, plumbers, sparkies & handymen.
Every trade guide on OzTradie Calc is backed by free, interactive tools built to Australian Standards. Explore over 50+ specialized calculators for chippies, sparkies, plumbers, and subbies.