Templeton Built

If you’re planning wall materials and construction methods for Adelaide renovations, understanding the local landscape is essential. Adelaide’s unique combination of climate, soil conditions, and planning regulations means your extension project needs to be designed and built with South Australian conditions front of mind.

This guide covers what Adelaide homeowners need to know — from planning approval to construction, costs to material choices — so you can make informed decisions about your project.

Understanding Your Options

Every extension project starts with a question: what do you need, and what does your site allow? In Adelaide, the answer depends on your block size, council zoning, existing structure, and budget.

The most common extension types in Adelaide include rear extensions (opening up to the garden), side extensions (using unused side passage), second storey extensions (going up when you can’t go out), and wraparound additions that combine multiple approaches.

Your site’s constraints will guide the design. In the eastern suburbs (Burnside, Norwood, Unley), smaller blocks and character overlays often push homeowners toward rear extensions or second storey additions. In the Adelaide Hills (Stirling, Crafers, Aldgate), sloping sites require engineered foundations and careful integration with the existing terrain.

Planning Approval in South Australia

All extensions in Adelaide require approval under the Planning & Design Code. The pathway depends on your project’s scale and location:

• Deemed-to-satisfy: Extensions that meet all standard setback, height, and site coverage rules can be approved quickly — typically 5–10 business days.
• Performance assessed: Projects that vary from standard criteria go through a merit assessment, which may include neighbour notification. Allow 4–8 weeks.
• Heritage and character zones: Properties in heritage overlays (common in Unley, Norwood, North Adelaide) face additional scrutiny to ensure extensions are sympathetic to the existing streetscape.

Your builder should manage the entire approval process. At Templeton Built, we prepare all documentation, liaise with council, and handle any conditions — so you’re not left navigating bureaucracy on your own.

Adelaide-Specific Building Considerations

Reactive Clay Soils

Much of Adelaide sits on reactive clay that expands when wet and shrinks when dry. Your extension’s foundation design must account for this soil movement to prevent cracking and structural issues. This typically means deeper footings, engineered slabs, or pier-and-beam foundations depending on the soil classification.

Connecting Old to New

One of the biggest challenges in any extension is the junction between existing and new construction. Adelaide homes span every era — sandstone and bluestone in the inner suburbs, double brick from the 1950s–70s, and lightweight framing in newer areas. A good builder understands how to create a weathertight, structurally sound connection that looks seamless.

Summer Heat Design

With Adelaide summers regularly exceeding 40°C, your extension needs passive cooling built in: deep eaves on the north and west, operable windows for cross-ventilation, appropriate glazing, and thermal mass where it helps. Getting this right at the design stage saves thousands in air conditioning costs over the life of the home.

Bushfire Zones

If your property is in the Adelaide Hills or other bushfire-prone areas, your extension must comply with the relevant BAL (Bushfire Attack Level) rating. This affects materials, window specifications, deck construction, and landscaping within the asset protection zone. Your builder should factor these requirements into the design and budget from day one.

What It Costs

Extension costs in Adelaide vary significantly depending on scope, site conditions, and finish level. As a guide for 2025–2026:

• Single storey rear extension: $2,800–$4,500 per square metre
• Second storey addition: $3,500–$5,500 per square metre
• High-end extension with premium finishes: $5,000–$7,000+ per square metre

These figures include design, engineering, approvals, construction, and standard finishes. Site-specific factors like soil conditions, slope, asbestos removal, and heritage requirements can add to the cost. Always get a detailed, itemised quote before committing.

Choosing Your Extension Builder

Your builder choice is the single biggest factor in your project’s success. Look for custom home builders in Adelaide who hold a current BLD licence, carry mandatory Home Building Work Indemnity Insurance, and have a track record of successful extensions in Adelaide.

Ask about their process, communication style, contract terms, and how they handle variations. A quality builder will be transparent about costs and timelines — and won’t pressure you into signing before you’re ready.

Templeton Built specialises in home extensions in Adelaide and renovation builders in Adelaide across Adelaide — from the Hills to the beaches. We bring local knowledge, transparent pricing, and a commitment to quality to every project.

Ready to Get Started?

Templeton Built has been helping Adelaide homeowners bring their renovation and building projects to life — from the Hills to the beaches. We understand local regulations, soil conditions, and what it takes to deliver a quality result in South Australia.

Contact Templeton Built today for a no-obligation chat about your project.