Lush green plants line a wooden pathway beside a swimming pool.

Decking Material Guide for Perth’s Climate

Published on 24 Sep 2025

by Mike Tuhaka

Key takeaways

Perth’s climate (hot summers, coastal salt air) demands durable and low-maintenance decking materials.
Timber (Jarrah, Merbau, Spotted Gum, Blackbutt) offers natural beauty but requires regular upkeep.
Composite decking is rising fast in popularity due to low maintenance, UV resistance, and long warranties.
Costs differ sharply upfront, but composites often win on long-term value.
Preferences vary across Perth suburbs: heritage homes lean to hardwoods, new builds to composites.

Understanding Perth’s Climate

Perth has:

Intense UV exposure in summer, regularly above 40°C.
Coastal salt air in western suburbs.
Dry, hot summers and mild, wet winters typical of Mediterranean climates.

These conditions cause timber to fade, crack, or rot without maintenance. Composites are engineered to resist UV, moisture, and salt, making them a practical option for many households.

Timber Decking Options

Jarrah

Durability: Class 2 above-ground, lifespan 25 to 40+ years.
Strengths: Heritage appeal, rich colour, natural termite resistance.
Drawbacks: Requires oiling to maintain colour; higher cost.
Best For: Traditional homes, established gardens.

Merbau

Durability: Hard, stable, resists wear.
Strengths: Affordable compared to other hardwoods; rich warm colour.
Drawbacks: Needs ongoing sealing; not native to WA.
Best For: Large backyard decks, family entertaining spaces.

Spotted Gum

Durability: Class 1 above-ground, lifespan 40+ years.
Strengths: High dimensional stability; premium look.
Drawbacks: Expensive upfront.
Best For: Premium decks, pool surrounds, bushfire-prone areas.

Blackbutt

Durability: BAL-29 fire rating; lifespan 25 to 35 years.
Strengths: Light colour reflects heat; bushfire compliance.
Drawbacks: Needs sealing and care in coastal zones.
Best For: Coastal and fire-risk suburbs.

Composite Decking

Composition: Blend of recycled wood fibres and plastics.
Durability: Resistant to UV, moisture, rot, and termites.
Strengths: Slip-resistant, fire-retardant, minimal maintenance.
Drawbacks: Higher upfront cost; cannot be sanded or stained.
Brands: Trex, ModWood, NexGEN, Futurewood, NewTechWood.
Warranties: Up to 25 to 50 years.
Best For: Families, coastal homes, pool areas, modern builds.

Other Options

Treated Pine: Affordable, easy to install, but splinters and rots quickly.
Aluminium/PVC: Ultra-durable, fire and slip resistant, but industrial look and higher cost.
Eco-Composites: Made from recycled plastics, emerging in 2025 trends.

Decking Material Cost Comparison

Material	Maintenance Needs	Lifespan
Treated Pine	High: regular oiling	10 to 15 years
Jarrah	Medium: oil/seal every 12 to 18 months	25 to 40 years
Merbau	Medium: oil/seal every 12 to 18 months	20 to 30 years
Spotted Gum	Medium: oil/seal every 18 to 24 months	40+ years
Composite (mid-range)	Low: occasional wash	25 to 30 years
Composite (premium)	Low: occasional wash	30 to 50 years

Key point: Timber has lower upfront costs but higher lifetime maintenance. Composites cost more initially but save time and money over decades.

Pros and Cons at a Glance for Decking Materials

Material	Pros	Cons	Popularity in Perth
Jarrah	Natural beauty, heritage look, termite resistance	Regular oiling, colour fades	High in traditional homes
Merbau	Affordable hardwood, rich tone	Needs sealing, imports	Moderate-high
Spotted Gum	Premium, very durable	Expensive	Premium suburbs
Blackbutt	Light colour, good bushfire rating	Needs maintenance in coastal areas	Strong coastal choice
Composite	Low maintenance, eco-friendly, warranties	Higher upfront cost	Rising leader in 2025
Treated Pine	Budget-friendly	Splinters, short lifespan	Budget builds
Aluminium/PVC	Fire and salt resistant, no rot	Industrial look, costly	Niche (pools/commercial)

Regional Decking Material Preferences in Perth

Hills (Kalamunda, Mundaring): Jarrah, Spotted Gum, bushfire-rated, heritage style.
Coastal (Cottesloe, Scarborough): Premium composites, Pacific Teak, salt resistance.
New Developments (Ellenbrook, Baldivis): Blackbutt, composites, low-maintenance, family-friendly.
Inner Suburbs: Mix of hardwoods and composites, renovation and investment properties.

Conclusion

Perth’s climate demands materials that balance beauty with durability. Timber remains a strong choice for tradition and heritage, but composite decking is rapidly overtaking it in modern suburbs thanks to low maintenance, warranties, and eco-credentials.

The right choice depends on your budget, design preferences, and lifestyle needs, but either way, a well-planned deck in Perth adds lasting value to homes.

Mike Tuhaka

Mike Tuhaka runs Perth Landscape Guys. He and his team design and build outdoor spaces right across Perth, from Currambine down to Mandurah, including paving, decking, retaining walls, artificial grass, lawn and reticulation. They are preferred installers for Freo Stone, Eco Stone and Remastone, and have worked on commercial projects for Murdoch University and Parsons Group. What customers mention most is Mike’s honest advice and the regular updates from the first plan to the final clean up.

We are extremely happy with the work that Michael, Mike, Sam and their team completed at our house. They re-did our whole front yard and were the easiest to work with throughout the entire project. Nothing was ever a drama for them and their experience came in handy when the project had to pivot mid way through. Would definitely recommend for large residential projects, and would have them back again.

Chris Prell

We had a fabulous experience with Perth Landscape Guys from the start to the end. It was a difficult job given they had to fill in our swimming pool then deck the entire area. Access was terribly hard given we have an internal courtyard with no external access. Despite this they managed the process so well. They communicated throughout and very hands on. We could not fault their service. We are so happy with the outcome.

Debra Hart

Brilliant! We could not be happier with our amazing outdoor space. Mike and his whole team did not disappoint. From the first point of contact with Michael and all the way through with each of the crew, all were excellent. Bonnie’s skill and workmanship must be commended. We are extremely happy with the transformation and new alfresco space, boardwalk along with the front garden beds and retaining walls. Throughly recommend engaging the Landscape Guys!

Bryony

I recently had my backyard transformed and couldn't be happier with the results. I started with a fairly 'arm-wavey' design, but the team successfully converted it into reality including limestone walls, paving, grass and a new reticulation system. Sam was excellent to deal with, he checked in every morning to discuss progress and provided clear options whenever issues arose. The entire project was completed quickly and on budget.

Samuel Bayford

Perth Landscape Guys carried out a large backyard renovation for us, including pavers, turf and pool landscaping. Every member of the team provided exceptional service, went above and beyond to make sure we were happy with the final product and were great to deal with. Mike, Jamie, Chris, Sam and James did an absolutely excellent job - would give more than 5 stars if I could!

Joseph Restifo

I am very impressed with the way the work was done on my garden, and the results. From the initial quote through demolition and removal of existing landscaping, construction of a small wall, extending brick paving, cladding a fence, installation of artificial turf and final clean up, the work was promptly and immaculately done. The price seemed reasonable, comparable with a couple of other quotes. I'm now enjoying going outside!

Christine W

We got Mike and the guys to do the landscaping around our new build house. The job had many different parts to it - paving, laying turf, tree planting, security gate installation etc. We're very happy with the result - job complete on time and to a high standard. We have no hesitation in recommending them for any landscape project.

Tadhg O'Reilly

Thanks to Mike and the Perth Landscape Guys awsome job and a special thanks to Chris and Joel for the paving and front limestone wall we are proud of our outdoor area Thank you

Shirley Hemley

We engaged the Perth Landscape Guys to enhance our pool surround (complete the paving, fencing, etc) following the installation of our pool, and are incredibly impressed with the results. From planning to completion, the team has gone above and beyond to bring our project to life, and ensured every detail met (and exceeded) our expectations. A huge thanks to the entire team! We highly recommend their services.

Lewis Taylor

Happy with our paving job. The guys were on time. helpful and when I had a minor issue on completion they didn't hesitate to come and rectify. Highly recommend them

Mario Samarelli

Decking Material Guide for Perth’s Climate

Key takeaways

Understanding Perth’s Climate

Timber Decking Options

Jarrah

Merbau

Spotted Gum

Blackbutt

Composite Decking

Other Options

Decking Material Cost Comparison

Pros and Cons at a Glance for Decking Materials

Regional Decking Material Preferences in Perth

Conclusion

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