CARPENTER COSTS IN WA

Carpenter hourly rate

$70–$120/hr

Licensed, experienced

Timber deck (per m²)

$300–$600/m²

Hardwood, supply and install

Composite decking (per m²)

$350–$700/m²

Trex/Modwood, supply and install

Pergola (freestanding)

$4,000–$12,000

Timber, 4m x 4m approx

Alfresco structure

$6,000–$20,000

Attached, roof sheeted, structural

Garden shed installation

$500–$1,500

Kit assembly, concrete base extra

Door hanging (per door)

$150–$350

Internal, includes hardware

Custom joinery (per day)

$600–$1,000

Day rate, materials extra

Timber selection for WA conditions

Perth's UV intensity, termite pressure and summer heat make timber selection critical for outdoor structures. Jarrah and Kwila (Merbau) are the dominant hardwood choices for Perth decks — both are durable but Kwila is significantly cheaper due to local supply of jarrah becoming limited and expensive. Composite decking (Trex, Modwood) has grown rapidly in Perth due to its termite resistance and low maintenance requirements. Pine is not suitable for ground-contact applications in WA due to termite risk — any carpenter suggesting pine posts in contact with soil in Perth should be questioned.

Termite risk in Perth

Perth has significant termite pressure — particularly in sandy soils in suburbs from the Hills down to the coast. Any timber structure requires either naturally termite-resistant species (jarrah, redgum) or H2 or H3 treated pine for above-ground applications. Ground contact timber must be H4 or H5 treated or naturally durable. A carpenter who does not discuss termite treatment for a deck or pergola in Perth is either inexperienced or cutting costs on materials.

Building permits for structures

Structures over a certain size in WA require a Building Permit from your local council. A freestanding pergola or alfresco structure over 10m² in most Perth councils requires a permit. The permit process typically costs $300–$800 and takes 2–6 weeks. Your carpenter should know the thresholds and advise you — not leave you to find out after the structure is built that it is unpermitted.

Perth's alfresco demand

Covered outdoor entertaining areas (alfresco, patio, pergola) are the most requested residential addition in Perth. Demand is consistently high, particularly in the September–November spring lead-up to summer. Experienced pergola and alfresco builders book out 6–12 weeks ahead. Do not expect to get a job done in November if you only start quoting in October.

What timber species are you specifying and why is it appropriate for this application in Perth?

Is the timber termite resistant or H3/H4 treated — which standard applies?

Does this structure require a Building Permit and who will obtain it?

Are you a registered Building Service provider?

What is the maintenance requirement for this timber/composite over 10 years?

What is your warranty on the structure and the finish?

Can you provide references for similar work in Perth with photos?

Is the concrete footings work included in your scope?