Tiler on a residential job: scope, licensing, tolerances, working with other trades

TL;DR

The tiler fixes ceramic, porcelain, stone, and mosaic tiles to floors and walls on residential jobs. AS 3958:2023 (Installation of ceramic and stone tiles, superseded the 2007 edition) is the installation standard; AS 3740:2021 governs wet area waterproofing that precedes every wet-area tile job. In wet areas, the tiler follows the waterproofer: membrane must be fully cured and inspected before tiling starts. Licensing varies by state: NSW requires a separate contractor licence for tiling work over $5,000 and, critically, a separate waterproofing licence for wet-area membrane application; QLD QBCC includes waterproofing for tiling within the wall and floor tiling licence scope. Top job-killer on a tiling package is sequence clash: tiling into an uninspected or uncured membrane creates a defect trail that is expensive to remedy and hard to spot until grout or tiles crack.

What this trade covers

The tiler on a residential job works across two broad settings.

Wet areas: showers, bathrooms, ensuites, laundry floors, and around baths and spas. In these locations, the tiler follows the waterproofer (or in QLD, often carries the waterproofing scope within their own licence). Tile adhesive and grout applied to an uncured liquid-applied membrane can disrupt curing chemistry and compromise the bond. The waterproofing membrane inspection must be signed off before tiling begins.

Dry areas: living areas, hallways, alfresco, covered outdoor areas, feature walls, and pool surrounds where waterproofing requirements differ. Floor falls toward floor waste points are still a tiler responsibility in dry areas where drainage is present.

The standard governing tile installation across both settings is AS 3958:2023 (Installation of ceramic and stone tiles), which superseded AS 3958.1:2007 and incorporates Amendment No 1 (June 2024) (verified 2026-05-10).

What’s in scope (typical residential)

Supply or fix ceramic, porcelain, stone, glass mosaic, terracotta, and slate tiles to floors and walls per AS 3958:2023
Substrate preparation: checking flatness, cleaning, priming where required per AS 3958:2023
Back-buttering tiles where the adhesive bed alone does not achieve full coverage (required for large-format tiles and wet areas per AS 3958:2023)
Maintaining floor fall toward drains (1:80 minimum, 1:50 in wet areas per AS 3740:2021 and NCC 2022 HP 10.2)
Grouting and pointing, including flexible sealant at movement joints and internal corners
Cutting around penetrations (pipe collars, floor wastes, power points)
Tile trim and finishing edges (aluminium or PVC edge profiles, or stone bull-nose)
Slip resistance outcomes for finished floor surfaces, assessed under AS 4586:2013

What’s out of scope (often confused)

Wet area membrane application in NSW: under NSW Fair Trading licensing rules, applying a wet area waterproofing membrane (liquid-applied, sheet, or solid) is a separate contractor licence category (CPC31420 Certificate III in Construction Waterproofing). A tiler without a waterproofing licence cannot lawfully apply the membrane in NSW on work over the $5,000 threshold. In QLD, the QBCC wall and floor tiling licence explicitly includes “apply waterproofing for wall and floor tiling” within its scope (verified 2026-05-10).
Substrate screeds and falls built into concrete: achieving the fall in the structural slab or a thick screed is typically concretor or plasterer scope. The tiler tiles over the finished substrate; the fall must already be in it.
Grout selection for structural movement: the tiler grouts; the engineer or architect specifies whether a flexible grout or movement joint is needed at structural plane intersections. The tiler is not responsible for structural slab cracking that breaks grout lines.
Tile selection and procurement: the tiler installs supplied tiles. If the client or builder supplies tiles with inherent warpage (common in large-format porcelain), the tiler should document pre-installation to protect against lippage claims after fixing.
Plumbing rough-in and floor waste positioning: the plumber rough-ins penetrations and sets floor waste positions. The tiler works around them; incorrect waste position is plumber scope.

The scope of works should specify: who supplies tiles, adhesive, grout, and tile trim; who applies the waterproofing membrane; who is responsible for the substrate screed and fall; and what slip resistance P-rating is specified.

Engagement basics

Licensing, state-by-state

State	Scheme	Key rule
NSW	NSW Fair Trading contractor licence	Required for wall and floor tiling work over $5,000 in labour and materials (including GST). Qualification: CPC31320 Certificate III in Wall and Floor Tiling (or equivalent prior codes). Penalties: $22,000 individual / $110,000 company under the Home Building Act 1989 (NSW). Separate waterproofing licence (CPC31420 Certificate III in Construction Waterproofing) required for wet area membrane application (verified 2026-05-10).
VIC	Building and Plumbing Commission (formerly VBA)	Registration as Domestic Builder (Limited to Floor and Wall Tiling Work) required for residential tiling. Application form updated July 2025 under the transition from VBA to Building and Plumbing Commission. Verify current thresholds and requirements with the Building and Plumbing Commission (verified 2026-05-10).
QLD	QBCC wall and floor tiling licence	QBCC wall and floor tiling licence covers fixing ceramic, glass, marble, slate, stone, and terracotta tiles, constructing terrazzo, and applying waterproofing for wall and floor tiling within scope. Licence required for residential work over $3,300 (incl. GST). Managerial qualification (BSBESB402) required for contractor licence. Fit-and-proper person test applies (verified 2026-05-10).
WA, SA, TAS, NT, ACT	Each state has its own scheme	Verify current licence class, insurance requirements, and threshold with the state regulator before quoting.

Apprenticeship pathway

Tilers typically complete a CPC31320 Certificate III in Wall and Floor Tiling through a TAFE or registered training organisation (RTO), usually via a 3 to 4 year apprenticeship. The current qualification code is CPC31320; older codes (CPC31311, CPC31308, BCG31303) are recognised equivalents under NSW Fair Trading licensing rules (verified 2026-05-10).

The Australian Tile Council (ATC) is the peak industry body for the tile industry in Australia. ATC membership is available to tilers and tile merchants; it is not a mandatory accreditation scheme, but ATC members are generally familiar with AS 3958:2023 and the NCC wet area requirements.

Insurance the tiler should carry

Public Liability: minimum $5m for sole-trader residential, $10m when working under a head contractor
Workers Compensation: required for any employees or apprentices
Tool insurance: not contractually required but standard for sole traders with significant tool inventory (angle grinders, tile saws, suction lifters)

Certificates of Currency for PL and Workers Comp should be sighted before work starts.

Pricing basis

Tiling is typically priced per square metre (m²). Rates vary significantly with:

Tile size and format: large-format tiles (600 x 600mm and above) require more care, full back-buttering, and slower production rates. Rates for large-format are higher.
Layout pattern: straight lay is the base rate; diagonal, herringbone, or feature patterns attract a premium (more cuts, more waste).
Wet vs dry area: wet area tiling typically attracts a premium for fall maintenance, membrane interface management, and PCI exposure.
Substrate condition: if the substrate is out of flat beyond the tolerance in AS 3958:2023, re-screeding or levelling compound adds to cost. Agree on substrate prep responsibility in the quote.

Day rates apply to complex or remedial work. Confirm whether the rate includes supply of adhesive and grout or tiles-only installation.

Tolerances and acceptance

Tiling is judged at PCI against the contract spec, AS 3958:2023 (the current edition, superseding AS 3958.1:2007), and the HIA Guide to Materials and Workmanship plus the relevant state Guide to Standards and Tolerances.

Standards baseline (AS 3958:2023)

AS 3958:2023 (Installation of ceramic and stone tiles) is the current deemed-to-satisfy standard for tile installation in Australia. It covers substrate preparation, adhesive selection, tile fixing, back-buttering requirements, grouting, and movement joints (verified 2026-05-10).

AS 3958:2023 sets a maximum lippage (height differential between adjacent tile edges) of 2 mm for standard tiles. For large-format porcelain with inherent warpage, achieving less than 1 mm is often not possible; document inherent tile warpage before installation to protect against post-installation lippage claims.

Wet area falls

AS 3740:2021 and NCC 2022 HP 10.2 require shower floor falls of no less than 1:80 and no greater than 1:50 toward the drain. The tiler is responsible for maintaining this fall in the tile bed over a correctly prepared substrate. A fall installed at the waterproofing stage but not maintained in the tile bed is a tiling defect.

Slip resistance (AS 4586:2013)

Slip resistance classifications for wet and dry areas are set under AS 4586:2013 (Slip resistance classification of new pedestrian surface materials). P-ratings (P0 to P5) apply to wet areas; higher P-ratings indicate better wet grip. The specification should nominate the required P-rating before tile selection; the tiler is responsible for achieving the specified P-rating with the selected tile (verified 2026-05-10).

Workmanship tolerances (HIA Guide pending)

Numerical workmanship tolerances for joint width consistency, adhesive coverage, and substrate flatness are set by the HIA Guide to Materials and Workmanship and the relevant state Guide. Values are pending HIA member access.

Item	Guide coverage
Grout joint width consistency	Per current HIA Guide to Materials and Workmanship and state Guide. Pending HIA member access. [HIA-124]
Adhesive coverage (full back-butter in wet areas)	Per AS 3958:2023 and HIA Guide. AS 3958:2023 requires full-bed adhesive contact in wet areas; numerical coverage threshold from HIA Guide pending member access. [HIA-125]
Finished tile surface flatness	Per HIA Guide and state Guide. Pending HIA member access. [HIA-126]

What can be assessed independently

Lippage: AS 3958:2023 sets the 2 mm maximum. A feeler gauge or straight edge is sufficient to assess at PCI.
Falls: check at floor waste with a spirit level or digital level. Falls running away from the drain are a defect.
Hollow tiles: tap-test at PCI. A hollow sound indicates loss of adhesive bond; debonded tiles are a defect under AS 3958:2023.
Grout cracking at movement joints: grout in internal corners, change-of-plane joints, and around penetrations should be flexible sealant, not rigid grout. Cracked rigid grout at these locations is a workmanship defect.

Common defects to look for

What inspectors and clients flag at PCI and final inspection:

Lippage: height differential between adjacent tile edges exceeds 2 mm (AS 3958:2023 limit for standard tiles). Especially visible in raking light. Large-format tiles on wavy substrates are the most common source. Pre-installation substrate flatness check is the control.
Hollow or debonded tiles: audible on tap-test at PCI. Caused by insufficient adhesive coverage (failure to back-butter large-format tiles, or adhesive skinning before tile placement), contaminated substrate, or movement in the substrate after fixing. Debonded tiles in wet areas are a waterproofing integrity risk as well as a finish defect.
Grout cracking: rigid grout in movement joints (internal corners, around penetrations, plane changes) cracks under thermal or structural movement. The fix is to rake out, clean, and re-apply flexible sealant per AS 3958:2023.
Falls incorrect or insufficient: shower floor draining poorly or not at all. Often caused by membrane-applied fall not being maintained through the tile bed, or a substrate that was never set at the correct fall. Rectification typically requires removal of tiles and re-screeding.
Slip resistance non-compliant: tiles installed that do not meet the specified P-rating for the area. Most commonly caught when a client reports a wet-surface slip incident. Check the tile specification before ordering; R-rating (DIN standard, not AS 4586) is common in product literature but is not the Australian standard.
Sealant missing or wrong product at tile-to-frame junctions: the joint between tiles and window frames, shower screens, or bath surrounds should be flexible sealant, not grout. Cracked grout at these junctions is a maintenance item that becomes a waterproofing failure if left.
Grout colour inconsistency: varies with grout-to-water ratio, mixing consistency, or use of different grout batches. Flag at PCI; often unrectifiable without full grout removal.

Most hollow tile and fall defects are caught during installation rather than at PCI. The cost of tile removal, substrate re-prep, and re-tiling is high relative to the cost of checking at the time of fixing.

Subbie quote pack, what should be in it

A complete tiler quote pack covers:

Scope: which areas are in (wet, dry, feature, pool surround), which are explicitly out; supply boundaries for tiles, adhesive, grout, tile trim, and flexible sealant; who applies the waterproofing membrane
Tile specification: confirm tile size, format, and P-rating or R-rating; who is responsible if supplied tiles have inherent warpage
Layout and pattern: straight lay, diagonal, herringbone, or feature pattern; confirm origin point and direction before setting out
Pricing basis: m² rate for each area type; rate for day-work on unscoped items; minimum charge if applicable
Substrate prep: confirm who is responsible for substrate flatness and fall; what the tiler will do and charge if the substrate is out of tolerance
Programme commitment: days for each area; programme dependencies (waterproofing membrane inspected and cured, substrate prep complete, plumbing rough-in complete, floor waste set)
Licence and insurance: contractor licence number (and waterproofing licence if applicable), Certificates of Currency for PL and Workers Comp
Site obligations: tile waste and adhesive disposal; WHS obligations including SWMS for any elevated work; tile storage area access
Variation mechanism: how extras are priced; day rate for unscoped work; written authorisation required before proceeding

The same list reads from different sides:

For the engaging party (builder or client direct): use this list as the quote template. Require all items before signing.
For the tiler quoting: providing all of these without being asked wins jobs and reduces disputes.
For the client reviewing a builder’s engagement: this is the bar the builder should be applying.

References

AS 3958:2023 Installation of ceramic and stone tiles (Standards Australia) (verified 2026-05-10)
AS 3740:2021 Waterproofing of domestic wet areas (Standards Australia) (verified 2026-05-10)
AS 4586:2013 Slip resistance classification of new pedestrian surface materials (Standards Australia) (verified 2026-05-10)
NCC 2022 Volume Two, Part 10.2 Wet area waterproofing (ABCB) (verified 2026-05-10)
NSW Government: Wall and floor tiling work (verified 2026-05-10)
NSW Government: Waterproofing work (verified 2026-05-10)
QBCC: Wall and floor tiling licence (verified 2026-05-10)
Building and Plumbing Commission (VIC): Registration and licensing (verified 2026-05-10; VBA transitioned to Building and Plumbing Commission July 2025)
CPC31320 Certificate III in Wall and Floor Tiling (training.gov.au) (verified 2026-05-10)
HIA Guide to Materials and Workmanship, pending member access for numerical workmanship tolerances
NCC 2022 Volume Two for Class 1 and Class 10 buildings, ABCB (verified 2026-05-10)