Every standard, licence, and bit of trade shorthand on this site — translated into plain English.

Sets the wind force every Australian building must be engineered to resist. Cyclone zones use the most stringent category (C and D).

Defines safe glass thickness, type (toughened, laminated) and installation method for windows, splashbacks, balustrades, and pool fences.

Technical requirements for scaffold components, loading capacity, ties, and erection.

The framing bible. Specifies member sizes, fixings, bracing, and wind ratings for timber-framed Australian homes.

Fall protection guidance referenced where roof or facade work occurs above 2m.

Installation, fixing pattern, jointing and finishing levels (Levels 1–5) for plasterboard walls and ceilings.

Soil classification (A, S, M, H1, H2, E, P) and the footing design required for each. Dictates excavation depth and slab cost.

The electrical installation standard every Australian electrician works to. Switchboard layout, circuit protection, earthing, RCDs.

Sets the maths for gutter sizing, downpipe count, and stormwater connection. The catchment calculation behind every gutter quote.

Engineering standard for concrete slabs, beams, columns. Specifies reinforcement, cover, curing.

Bricklaying and blockwork engineering. Mortar grades, tie placement, control joints, wind-rated walls.

Subgrade preparation, slab thickness, joint spacing, and finish for driveways and paths.

The bathroom & laundry standard. Membrane types, falls, flange requirements at penetrations, junction details.

Compaction testing, fill placement, and verification for site cuts and engineered fill.

Pre-1970 homes likely contain lead paint. Specifies containment, removal method, and disposal.

Companion to AS 1576 — safe-use practices, inspection intervals, scafftag requirements.

Balconies, terraces, planter boxes, retaining walls. Differs from AS 3740 because it covers exposure to UV and weather.

Insulation product performance specs (R-value, fire rating, vapour permeability) for batts, blow-in, foam.

The umbrella code that incorporates many of the standards above. Replaced the Building Code of Australia (BCA) in name but same underlying framework.

Mandatory insurance NSW builders take out on residential work over $20,000. Covers the homeowner if the builder dies, disappears, or becomes insolvent during the work or within 6 years of completion.

QBCC-administered. Required on residential work over $3,300. Equivalent function to NSW HBC.

Required on Victorian residential work over $16,000. Covers non-completion, structural defects (6yr), and non-structural defects (2yr).

Required for scaffolding (SB/SI/SA classes), forklift operation, crane operation, working in confined spaces. Held by individuals, not companies.

Basic (SB) handles standard residential. Intermediate (SI) covers cantilever, tube-and-fitting. Advanced (SA) covers suspended, engineered, large commercial.

For asbestos that crumbles under hand pressure (pipe lagging, sprayed coatings). Highest-tier licensing, full containment required.

For bonded sheet asbestos (eaves, fences, wall cladding). Mandatory for jobs over 10m² in every state.

A standard plumber's licence does not cover guttering or roof drainage. Roof plumbing is a separate endorsement — the most common gap that catches buyers.

Installer-level credential. Required for any solar install that claims federal STCs (rebates) and for grid connection.

In QLD & NSW, new builds require termite management certification — chemical barriers, physical barriers, or both. Pest controller carries the cert.

Licences NSW builders, plumbers, electricians, and most residential trades. Administers HBC and consumer dispute resolution.

Licences Victorian building practitioners and plumbers. Administers DBI and building permits.

Licences Queensland builders and many trades. Administers HWS and the QBCC dispute resolution scheme.

Regulates demolition, asbestos, and HRW classes in Queensland.

NSW work-safety regulator. Administers demolition licensing, asbestos licensing, HRW.

Victorian equivalent of SafeWork NSW. Administers Registered Demolisher status, asbestos licensing.

South Australian regulator for trade licensing including plumbing, demolition, and building.

Western Australian regulator for builder registration and plumbing licensing.

Industry body that runs the installer accreditation scheme tied to federal solar rebates (STCs).

The source of rainfall intensity data (5-minute ARI) used in gutter sizing calculations.

The maximum deposit a builder can request before any work starts. NSW & QLD: 10% of contract price. VIC: 10% for contracts under $20k, 5% for contracts over $20k. Anything above is illegal.

Period after signing where the homeowner can rescind the contract. 5 business days in NSW for HBC-required contracts. Varies by state.

A change to the original contract scope. Must be in writing, signed by both parties, with a stated cost and time impact. Verbal variations are unenforceable in most disputes.

A line in the contract for an item whose final cost can't be determined at signing (e.g. tiles, kitchen). PSs typically reconcile up — budget +15–25% on average.

Similar to a PS but for products supplied by others (taps, appliances). The contract states a budget; final cost depends on selection.

The point at which work is substantially complete and the homeowner can occupy — minor defects excepted. Triggers final payment and starts the defects liability period.

The window after practical completion during which the builder must return to fix defects. Typically 13 weeks for non-structural; 6–7 years statutory for structural.

A pre-work photographic record of neighbouring properties. Protects the homeowner against future claims that demolition or excavation caused damage. $400–$900.

Free service (formerly Dial Before You Dig). Returns plans of all underground services on your property. Mandatory 3-day notice before any excavation.

A registered right of access or utility crossing over your land — sewer mains, stormwater, telecommunications. Shown on title. You cannot build over an easement without authority approval.

BlueScope Steel's pre-painted steel for roofing, walling, fencing, and guttering. 22 standard colours. 15-year paint warranty (subject to nine voiding conditions).

Aluminium-zinc-coated steel without paint — silver-coloured. Cheaper than Colorbond, used on sheds and rural roofing.

AS 2870 classification. M = moderately reactive clay (most common); H1/H2 = highly reactive (footing cost +25–45%); P = problem site (bespoke engineering).

Asbestos categories. Friable = crumbles under hand pressure (sprayed insulation, pipe lagging) — Class A licence required. Non-friable = bonded sheet (eaves, fences) — Class B.

Six levels (LOW, 12.5, 19, 29, 40, FZ) that grade a property's bushfire exposure. Dictates required construction standards and materials.

Low-pressure cleaning (100–500 PSI) with biocidal chemistry that kills algae, mould, mildew. The correct method for roofs, render, and painted surfaces.

De-ionised water cleaning method for windows. Telescopic pole reaches 8m+ from ground. Water dries with no mineral residue — streak-free.

Thermal resistance rating for insulation. Higher = better. Australian climate zones each have minimum R-value targets for ceiling, wall, and floor insulation.

Federal solar rebate mechanism. Number of STCs depends on system size, location, and install date. Traded for cash by the installer.

Landscaping shorthand. Hardscape = structural elements (paving, retaining walls, decks). Softscape = plants, lawn, mulch.

Material placed in compacted layers (typically 300mm) with density testing between layers. Used to bring a site to required levels.

After cleaning pavers, fresh kiln-dried sand is brushed into joints. Failing to reinstate causes pavers to rock and weeds to grow.

The overlap between joined metal sheets. Minimum 20mm for guttering, riveted and sealed with neutral-cure silicone.

Sealant chemistry that does not release acid as it cures. Required on Colorbond — acetic-cure silicone reacts with the paint and voids the warranty.

Pressure unit. Standard high-pressure cleaning operates at 2,500–4,000 PSI. Soft wash <500 PSI. Render limit ~800 PSI.

Earthworks pattern. Cut = remove soil from higher ground. Fill = place soil to raise lower ground. Most sites do both.

The prepared, compacted, level surface ready for slab pour. The endpoint of excavation work.

Excavated soil and rock. Either retained on site as engineered fill or carted away to a tip / recycler.

Equipment hire terms. Wet = with operator and fuel. Dry = machine only, you supply operator. Residential almost always wet.

Contractual obligation to repair damage caused during the work (drilled holes, marked walls, dug-up gardens). Spell out specifically in writing.

A coloured inspection card visible on the scaffold access point. Green = safe to use; red = do not use. Inspected and signed at least every 30 days.

A 150mm-high board at the edge of every scaffold platform, preventing tools and debris from falling off.

Garage door types. Sectional = horizontal panels that lift overhead. Panel-lift is older terminology for the same concept.

A pest or building inspection commissioned before exchanging contracts. Different to a routine inspection — carries indemnity weight.

Locksmith design where one key opens multiple locks while individual keys remain restricted. Common in apartment buildings, schools, businesses.