Building a Custom Home on Acreage in the Southern Downs and Granite Belt: What to Sort Out Before You Design

Quick Answer

Before you design a custom home on acreage in the Southern Downs or Granite Belt, settle six things: where the house sits on the land, how you will supply water, how wastewater will be treated on site, whether bushfire or flood mapping affects the house position, how the home will stay comfortable through cold winters, and which approvals apply. These decisions shape the floor plan and the construction cost. Sorting them out first means the design is drawn for your land, not adjusted to fit it later.

Why is acreage different from a town block?

On a town block, the street, the services and the setbacks decide most things for you; on acreage you choose the house position, the driveway, the water supply and the wastewater system yourself. Our acreage home design guide covers those general decisions in detail, so this article concentrates on what is specific to the Southern Downs and Granite Belt.

Where should the house sit on the land?

Start with the land, not the floor plan. Walk the site and look at:

• Slope and drainage. Where water runs in heavy rain, and where it sits afterwards.
• Orientation. Living areas that face north collect winter sun, which matters more here than on the coast.
• Wind. Exposed ridges have the best outlook and the coldest winter winds.
• Access. The driveway needs to work in wet weather and for delivery trucks during construction.
• Distance to power. The further the house is from the existing supply, the more the connection is likely to cost.
• Rock. Check whether there is rock at or near the surface, because it affects footings, trenching and wastewater design.

If your land slopes, our guide to building on a sloping block explains how slope changes the design and the cost.

Do I need tanks for water?

Most rural and acreage properties are outside the town water network, so the house relies on rainwater tanks. Southern Downs Regional Council’s rural water supply plan covers existing connections and does not allow for additional rural connections, so do not assume a new connection is available.

Inside the town water network, new houses in the Southern Downs must include a rainwater tank of at least 5,000 litres, plumbed to toilets, the washing machine and an outdoor tap. On tank-only properties the storage needs to be far larger, and it should be sized to your roof area, your household and local rainfall. Plan the roof and gutters as part of the water supply, and allow for water storage for firefighting where the land is in a bushfire area.

How is wastewater handled without town sewer?

Many properties in the Southern Downs are not connected to sewer. Wastewater is treated and disposed of on the property through an on-site sewerage facility, which needs council plumbing approval.

A site and soil evaluation decides which system suits the land and how much area is needed to disperse the treated water. That area has setbacks from buildings, boundaries, dams and watercourses. On shallow or rocky ground it can take up more room than people expect, so it needs a place on the site plan before the house position is fixed.

Does bushfire or flood mapping affect my land?

The Southern Downs Planning Scheme includes overlay maps for bushfire hazard, flood hazard, biodiversity, heritage and water resource catchments. If an overlay covers the part of the land where you want to build, it can change the house position, the materials or the approval pathway, so check the overlays for your lot first.

Council is also reviewing the planning scheme, and the draft includes changes for houses in the Rural zone, so confirm the current requirements at the time you apply. Our guide to flood and bushfire overlays explains how overlays and bushfire ratings work in general.

How should a home be designed for cold winters?

The Southern Downs is in a different climate zone from the coast. Under the National Construction Code, the Southern Downs is climate zone 5, warm temperate, while the Gold Coast is zone 2, subtropical. Stanthorpe sits high enough to have a highland climate, with frosts and cold winter nights.

A plan that works on the coast will not perform the same way here. The design should allow for:

• Living areas facing north, with eaves sized to let in winter sun and shade summer sun.
• Insulation and glazing chosen for cold nights, not only hot days.
• A compact, well-sealed layout that is easy to heat.
• A heating method decided early, because it affects the plan.

What approvals do I need?

A new house needs building approval and plumbing approval. Whether it also needs a planning application depends on the zone, the overlays and whether the design meets the planning scheme’s requirements for a house in that zone. This is specific to each lot, so it should be checked at the start of the design, not after the drawings are finished.

We prepare the documentation and coordinate with the building certifier and consultants. Our council approval guide describes the general process in Queensland.

How does Design Science work with regional clients?

Design Science is a Gold Coast building design practice that also designs homes for clients in Warwick, the Southern Downs and the Granite Belt. It is led by David Steadman, a licensed builder and licensed building designer, so the design is prepared with construction in mind.

Once you have purchased your land, we meet you on site for an initial consultation. Follow-up discussions can be held by phone or video call, which suits clients who are still living in the city. The consultation fee is $280, payable upfront, and it is credited in full against your design fee if you proceed. Design fees start from $3,000 and depend on the size and complexity of the project.

To see how a full project runs from brief to finished home, read our Southport case study. For more on our regional work, see building design in the Southern Downs and our custom home design service.

Frequently Asked Questions

Should I buy the land before I talk to a designer?

Yes. We start once you have purchased the land, because the design depends on that specific site. The first meeting is held on the land.

Can I use a plan designed for a town block?

You can, but it rarely makes the most of acreage. A standard plan is drawn for a narrow lot with a street at the front. On acreage the views, sun and approach can come from any direction, and the plan should respond to them.

How long does a custom home take?

Construction typically takes about 6 to 18 months, depending on the project. Allowing for design and approvals as well, most custom homes take about 12 to 24 months from the first design meeting to keys. Our guide to how long it takes to build a house sets out each stage.

How much does a custom home cost to build?

Cost depends on size, site and finish. Our 2026 building cost guide gives current rates per square metre for the Gold Coast. Regional sites add their own costs, such as water storage, on-site wastewater, power connection and longer access.

Do you design for towns outside Warwick and Stanthorpe?

Yes. We work with clients across the Southern Downs and Granite Belt, including Allora, Killarney and Ballandean, and in nearby areas within about an hour and a half of Warwick.

Ready to Plan Your Home?

If you have purchased land in the Southern Downs or Granite Belt and want a home designed for it, Request a Consultation.