Building a custom home is one of the largest projects most people will ever take on. It is also one of the most rewarding, provided you know what is coming. This guide walks through the stages of a typical custom build in South East Queensland, what happens at each one, and where your decisions have the most influence on the result.
Why the early stages matter most
A useful rule from commercial project delivery applies to homes too: your ability to influence cost and outcome is highest at the start and falls sharply once construction begins. Moving a wall on a sketch costs nothing. Moving it after the slab is poured costs thousands. Most of the effort in a well-run custom home goes into the first few stages, so that the build itself is calm and predictable.
Stage 1: Brief and feasibility
Everything starts with a clear brief. It should cover how you live now and how you expect to live in ten years, the rooms and spaces you need, the feel you want, and an honest budget that includes land costs, fees and a contingency.
If you already own land, a feasibility review checks what the site will allow: zoning, overlays, slope, soil, services, easements and any flood or bushfire constraints. If you are still looking, this review is worth doing before you sign a contract on a block (see our guide to choosing the right block).
Stage 2: Site investigation
Before serious design work begins, the site needs to be understood properly. This usually means:
- A contour and detail survey showing levels, boundaries, trees, services and neighbouring structures.
- A geotechnical (soil) report to classify the site and inform footing and slab design.
- Service searches for sewer, stormwater, water, power and telecommunications connections.
- Planning and overlay checks through the local council's planning scheme.
These reports cost relatively little and remove a large share of the risk from your budget.
Stage 3: Concept design
The designer turns your brief into floor plans, site layout and early elevations. This is the stage to test ideas freely, explore orientation and outdoor connection, and check that the size of the home lines up with the budget. A concept-stage cost estimate is essential here. It tells you early whether the design and the budget agree.
Stage 4: Design development and documentation
Once the concept is agreed, the design is developed into full construction documentation: architectural drawings, structural engineering, hydraulic and stormwater design, energy efficiency assessment and, where needed, specialist reports. This is also when most selections are made: finishes, fixtures, appliances, joinery and lighting.
The more complete your documentation and selections are before you sign a building contract, the fewer variations and surprises there will be during construction.
Stage 5: Approvals
Every new home in Queensland needs a building approval from a building certifier. Some homes also need planning approval from council, for example where an overlay applies or the design departs from the planning scheme's acceptable outcomes. Approval timeframes vary widely. We cover this in detail in Approvals in Queensland explained.
Stage 6: Pricing and contract
With documentation complete, the builder prepares a detailed price. A good price breaks the work into clear trade packages and states its inclusions, exclusions and any provisional sums or prime cost items. In Queensland, residential building work over $20,000 must be under a written contract that meets the requirements of the QBCC Act. Our guide to contracts and choosing a builder explains what to look for.
Stage 7: Construction
Construction usually moves through recognisable stages, often tied to progress payments:
- Site preparation and base: earthworks, footings, slab or suspended floor.
- Frame: wall and roof framing, with frame inspection.
- Enclosed (lock-up): roof, external cladding, windows and external doors.
- Fit-off: internal linings, cabinetry, tiling, fixtures and services fit-off.
- Practical completion: final inspections, certification and handover.
Expect regular site meetings and written updates. Changes during construction are possible but should go through a formal variation, with the cost and time impact agreed in writing before the work proceeds.
Stage 8: Handover and defects period
At practical completion you will walk through the home with the builder, record any minor defects, and receive certificates, warranties and manuals. Keep these together. Defects that appear after handover should be reported to the builder promptly and in writing. Queensland's statutory home warranty also applies, with time limits for reporting defects.
How long does it all take?
Timeframes depend heavily on the site, the complexity of the design and the approvals pathway. As a broad guide, design and approvals for a custom home often take several months, and construction of a two-storey custom home commonly runs around twelve months or more. Weather, design changes and late selections are the most common causes of delay.
Key takeaways
- Invest time in the brief and site investigation. They remove the biggest risks.
- Get cost estimates at concept stage, not after documentation is complete.
- Finalise selections before you sign the building contract.
- Put every change in writing as a formal variation.
This guide is general information for homeowners in Queensland and is not legal, financial or technical advice for your specific situation. Regulations, thresholds and council requirements change. Please confirm current requirements with the relevant authority (such as the QBCC or your local council) and your project team.