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  • Our places
  • Home buyers and builders angle down arrow angle up arrow
    • Residential land for sale
      Residential land for sale
      Residential land for sale Sales team
      Talk to our sales team
      Talk to our sales team
    • Home buyers
      How to buy land through SLA

      Your complete guide to buying process.

      Display village

      Everything to make your dream home a reality.

      Affordable Home Purchase Scheme

      Helping low to medium income households.

      Mingle, our community development program

      Our community development program that builds thriving and sustainable communities.

      Rebates and initiatives

      Explore how our rebates can help you achieve your dreams of sustainable, affordable living.

    • Builders
      Buying methods for builders

      The Suburban Land Agency has several ways for builders to purchase land.

      Put and call

      Put and Call gives you the opportunity to secure blocks of land with an extended settlement.

  • Developers angle down arrow angle up arrow
    • Developers land for sale
      Land for sale
      Land for sale Developers current opportunities
      Current development opportunities
      Current development opportunities
    • Developers
      Developers guide

      Learn about our sales process and find land for sale.

      Why develop in Canberra

      Find out about our vision for the ACT.

      Build-to-Rent

      Growing the number of rental homes in Canberra.

      Upcoming releases

      See what's coming up in the future.

      Sales results

      Browse our latest commercial and industrial sales results.

  • Sustainability and Innovation angle down arrow angle up arrow
    • Sustainability Strategy
      Our Sustainability Strategy
      Our Sustainability Strategy Sustainability case studies
      Case Studies
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    • Commitment to sustainability
      Why sustainability is important

      Learn why we need to live in happy, green and prosperous communities.

      Our vision for a sustainable future

      Find out how we aim to create great places where communities thrive.

      Showcasing our innovation

      Learn about our Built Form Program that is delivering climate-wise building projects.

      Supporting you to be sustainable

      Find guides and rebates that can help you build a sustainable home.

      Sustainable case studies

      Find out how we embed sustainability into all our work.

    • Our key priorities
      Placemaking

      Learn how we use Placemaking to understand the needs of the community and the environment.

      Resilient communities

      Discover how we're protecting our communities against climate change.

      Zero emissions suburbs

      Learn how we're making the ACT the most energy efficient place in Australia.

      Responsible production and consumption

      Find out how we're transitioning to a more circular economy.

      Healthy prosperous and inclusive places

      Learn how we're improving the wellbeing of communities through design, development and engagement.

  • About us angle down arrow angle up arrow
    • Join the team
      Join the team and grow your career
      Join the team and grow your career
    • Our people
      Who we are

      Our vision, our team, our CEO and Board.

      Working with Aboriginal and Torres Strait peoples

      Learn about out Reconciliation Action Plan.

      Careers

      Help create vibrant communities and sustainable neighbourhoods for ACT.

      Sponsorships and partnerships

      We sponsor a range of organisations, activities and events.

      Awards and achievements

      View our latest awards and achievements.

    • Our work
      What we do

      Delivering residential, commercial and industrial developments.

      How we price land

      Valuations and setting reserve prices.

      Housing Strategic Action Plan

      The framework that guides our actions.

      Indicative Land Release Program

      Find out when land is likely to be made available.

      Resources

      Find all our published documents in one place.

  1. Sustainability and Innovation
  2. Sustainable case studies

Whitlam living infrastructure project

Building resilience through living infrastructure

As we experience growing urbanisation and environmental challenges, cities around the world are re-evaluating their approach to urban planning and development. 

Population projections estimate Canberra will need to cater for more than 600,000 people by 2050. Known for its abundant green spaces and sustainable living credentials, Australia’s capital has emerged as a beacon of innovation in urban design. The ACT Government's 2018 Living Infrastructure Plan and Urban Forest Act play pivotal roles, offering guidance on how to integrate nature within the urban fabric. These ambitions are directly supported by the Suburban Land Agency’s Resilient Communities approach to sustainable development.

Redesigning for resilience in our streetscapes

According to research done by the Victorian State Government, our roads and footpaths make up the largest area of public space in our cities. This provides an opportunity to improve environmental resilience through a range of solutions, especially by focusing on tree canopies.

Street trees are such an important part of Canberra's streetscapes. Providing homes for our local bird populations and shade to our footpaths and front gardens, these trees help grow Canberra's urban forest towards reaching our target of 30% tree canopy cover by 2045.

We partnered with the Environment, Planning and Sustainable Development Directorate (EPSDD) and Transport Canberra and City Services (TCCS) to trial a number of ‘living infrastructure’ initiatives. Centred around the roads and verges in SLA’s Display Village in Whitlam, a core initiative aimed to get bigger trees into our new suburbs, faster.

Planting improvements

Getting bigger street trees into new suburbs helps fast-track the classic leafy feel of Canberra’s suburbs. But trees require significant water in their early years. This lead to the question as to whether a more passive use of water would allow them grow to their full potential in their early years through a more passive use of water.

A demonstration project in the Suburban Land Agency’s Display Village in Whitlam sought to understand the benefits of a range of new initiatives in how we can plant street trees.

Deeper pits to support better growth

Zelkova (Zelkova serrata) and Ash (Fraxinus pennyslvanica) trees were planted along Klaus Moje Street and St Leon Street in the SLA Display Village in Whitlam. The trees were planted in larger that usual 100L pots to fast-track the growth of Whitlam’s tree canopy.

A meta-analysis of 65 individual studies found that a doubling of the pot size increased biomass production by 43%. Biomass is the total weight of organisms within a certain volume area.

Improved soil conditions for healthier organic matter

To support the health and growth of these trees and the native plant mixes in the ‘tree pits’ surrounding the trees, higher quality soils were used in our experiment. These soils were made up of sandy soils and loams, tree planting mix and sand.

The higher quality soils were used  to promote healthier root growth in the early stages of the trees' development. The soil also supports an increase in organic matter levels so that a positive feedback loop is created. Where roots supporting greater exchange of nutrients to microorganisms that then feed back into the root systems.

Twelve months after planting, we found that the zelkova and ash trees were growing taller and bushier than the control trees planted further along Klaus Moje Street. The control tress had been planted with the existing method, without special soils and kerb inlets to support their growth.

A passive use of storm water with kerb inlets

Typically, street trees need a lot of watering to support their growth in their early years. The demonstration project investigated how stormwater could irrigate the trees in a passive way through 3 different, specialised kerb inlets. This would reduce the need for active watering and reducing the resourcing needed to support tree growth.

The 3 kerb inlet types are all designed to capture and divert stormwater into the tree pits before it runs into the stormwater drains, which are further downhill on the streets.

Kerb 1: A concrete kerb where concrete was cut out to allow water ingress.

Kerb 2: A readily available product with a steel grate that allows water through but blocks sticks and leaves.

Kerb 3: Custom-designed grates to allow water flow.

It’s likely that the above-average rainfall across 2021 and 2022 saw large amounts of rain falling directly into the tree pits as well as coming through the specialised kerb inlets, making observable differences between the three hard to identify in the first couple years of growth. But we did notice some differences.

Observing the kerb inlets during heavy rainfall and with a ‘water truck test’ facilitated by our TCCS colleagues, the kerb inlets with the steel grates (Kerb 1 and 3) saw water flowing less freely into the tree pits due to sediment build-up blocking the grates. The modified concrete kerbs (Kerb 2) were able to capture water successfully as the sediment didn’t build up on them as much.

In the future, using kerb inlets that require less maintenance (like the concrete Kerb 2), might therefore be a better option for allowing passive irrigation and reducing the burden on maintenance resources.

With drier years forecast for 2023 and 2024, we’ll be keeping a close eye on the trees to see if those planted with different kerb inlets grow differently.

Learn more

Visit SLA's Display Village in Whitlam to see the trees growing around our innovation precinct.

View Display Village

We acknowledge the Ngunnawal people as traditional custodians of the ACT and recognise any other people or families with connection to the lands of the ACT and region. We acknowledge and respect their continuing culture and the contribution they make to the life of this city and this region.

Acknowledgement artwork by Leilani Keen-Church

Artwork by Leilani Keen-Church

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