Both are legitimate ways to get a good house. A project home is a proven design, repeated. A custom build is a house drawn for your block and the way you live. Which suits you is decided far more by your land than by which is better.
What is the real difference between a custom build and a project home?
A project home builder sells you a design from a range. The plans are already drawn, engineered and costed, the supply chain is set, and the trades have built that house before. You choose a facade, a colour scheme and a few structural options.
A custom build starts with the site and the brief. Nothing is drawn until someone has walked the block and looked at the fall, the aspect, the soil, the outlook and the overlays. Documentation and pricing follow the design instead of preceding it.
The regulation does not differ. Whoever you engage must hold a QBCC licence, and the same contract rules apply either way. The QBCC’s own new home construction contract is written for the construction of an entire home regardless of price, while renovation and extension work on an existing home uses a Level 1 contract for prices from $3,301 to $19,999 or a Level 2 contract at $20,000 and over (QBCC, Domestic building contracts).
Which design decisions do you actually control?
On a project home you control finish and colour, a facade, and a short list of pre-priced structural options. The footprint, roof form, window sizes and structural grid are fixed, which is exactly what makes the price and the program reliable. On a custom build you control all of it, down to where the winter sun lands and whether the house steps down the site rather than sitting on a benched pad. That freedom is real, and so is the workload of hundreds of decisions. For some people that is the best part; for others, a curated set of choices is a feature, not a limitation.
Does your block decide the answer for you?
Often, yes. Project home ranges are costed against a reasonably flat, regular, serviced lot. The further your land sits from that assumption, the more of the standard design gets redrawn, re-engineered and re-priced, until you are paying custom rates for a catalogue plan.
On the Sunshine Coast and in Noosa Shire that assumption is frequently wrong: steep hillside blocks around Coolum, hinterland acreage, narrow beachside lots, battle-axe shapes, reactive soils, coastal exposure. Roebuck’s Grandview Drive Extension at Coolum Beach is a pole home extended in every direction, with a figure-eight pool raised on stilts.
Planning controls matter too. The Sunshine Coast is governed by the Sunshine Coast Planning Scheme 2014, which regulates the way land, buildings and structures are used and developed on the Sunshine Coast; Noosa Shire runs its own scheme, The Noosa Plan 2020, adopted in July 2020 to guide growth through to 2040. Where a site triggers an overlay or a development application, a standard plan has to move. See building on a sloping block in Queensland.
Custom build vs project home compared
| Consideration | Project home | Custom build |
|---|---|---|
| Design freedom | Facade, colours, a set list of options | Everything, within budget and planning controls |
| Sloping or irregular blocks | Each departure is re-engineered and re-priced | Designed around the fall and outlook from the first sketch |
| Inclusions | Defined specification; upgrades priced separately | Specified line by line to your brief |
| Pricing shape | A “from” base price plus site costs and selections | A site-specific tender for your documented design |
| Cost certainty | High once site costs and selections lock | High once design is complete, lower before that |
| Timeline driver | A repeated, already proven program | Design and approval pathway, then construction |
| Who you deal with | Consultant, liaison, supervisor across several sites | Usually the licensed builder, on fewer jobs |
| Best suited to | Flat serviced lots; buyers wanting fewer decisions | Difficult sites, unusual briefs, renovations |
What does a project home “from” price usually exclude?
A “from” price exists so you can compare designs within a range, not so you can budget your build. It assumes a standard slab on a level, cleared, serviced lot. Commonly outside it: site costs and earthworks, retaining, piering or engineered footings, rock excavation, service connections, driveway, landscaping, fencing, window furnishings, upgraded finishes, and council and certification fees. That is not dishonest, but two numbers are only comparable once both are site-specific. See what it costs to build a house on the Sunshine Coast.
Which option gives you more cost certainty?
Both can be fixed price, and the statutory protections are identical. The QBCC caps the deposit at 5% of the contract price for work valued at $20,000 or more, and at 10% for work valued from $3,301 to $19,999, and requires all progress payments to be relative to the amount of work completed (QBCC, Deposits and progress payments). A variation must be presented to you in writing and agreed by you in writing before the variation work starts, and a written copy must reach you before the variation work starts or within five business days of the day you both agreed to it, whichever comes first (QBCC, Contract changes and variations). Your builder must also take out Queensland Home Warranty Scheme cover on your behalf before starting residential construction work (QBCC, Home warranty insurance).
The practical difference is timing. A project home’s price firms up once site costs and selections settle; a custom build’s firms up once design and documentation are complete, which is later. Signing while big decisions are still open is what turns a fixed price into a stream of variations. The QBCC also strongly recommends against cost plus contracts for domestic work, noting that final costs under them are often considerably more than the homeowners anticipated at the start of the project, sometimes more than double their expectation, and that assistance for non-completion under the Queensland Home Warranty Scheme is not available (QBCC, Cost plus and construction management contracts).
How do the timelines differ?
A project home’s program is repeatable and its design phase is short, because the plans already exist. A custom build adds design and documentation before construction can be properly tendered, and the approval pathway then depends on the site: a code assessable application under either planning scheme moves faster than one triggering impact assessment or an overlay response, because impact assessable development must be publicly notified. Ask for a program in stages rather than a single number, and note the QBCC cooling-off period of five business days, which begins the day after you receive a signed copy of the entire contract including any plans and specifications and, for contracts valued at $20,000 or more, a copy of the QBCC Consumer Building Guide (QBCC, Cooling-off period).
Who do you actually deal with during the build?
Volume builders separate the roles: a consultant writes the contract, a liaison manages selections, and a supervisor oversees several houses at once. It is efficient, but the person who priced your job is rarely the person on site.
A custom builder runs far fewer projects. At Roebuck Concepts you deal with Tom Roebuck, director and licensed builder with more than 20 years in residential construction, who holds QBCC licence 15015060 alongside the company licence 15280811 and is a member of Master Builders Queensland. At the 2025 Master Builders Queensland Sunshine Coast Housing and Construction Awards, presented on 15 August 2025 at The Events Centre in Caloundra, the Grandview project at Coolum Beach won Home Renovation/Remodelling Project over $1 million, Best Residential Swimming Pool, and Best Use of Innovation.
Which one is right for you?
A project home is likely the better answer if your block is flat, regular and serviced, you want a shorter path from decision to slab, and predictability matters more than distinctiveness. That is a sensible choice, not a compromise.
A custom build earns its cost if your site is steep, narrow, irregular or overlay-affected, if the outlook only works with one plan, if you are renovating or extending, or if you would rather be part of the decisions. If that is your project, see our custom build and new home builds pages, or call the Coolum Beach office on 0477 333 386.
Common questions
Can a project home be built on a sloping block?
Often it can, using a split-level variant, a suspended floor or engineered footings. The real question is how much of the standard design survives. Once footings, retaining, drainage and floor structure have all been redesigned for your fall, you are paying for custom engineering on a plan never drawn for the site.
Is a custom build always more expensive than a project home?
Not necessarily, and comparing a base price to a custom tender is not a fair test. A base price excludes site costs and selections; a custom tender is site-specific from the outset. Compare finished, site-specific figures for the same scope.
Do custom builds and project homes use the same building contract in Queensland?
They sit under the same regime. The QBCC’s new home construction contract is written for building an entire home regardless of price, and the deposit caps, progress payment rules, written variation requirements and cooling-off period described above apply either way (QBCC, Domestic building contracts).
Can you change a project home design?
Within limits. Most volume builders allow a defined set of structural options and will consider modest changes for a fee. Substantial changes to the footprint, roof form or structure push the job outside what the range is priced to deliver, which is where a custom builder is worth a conversation. See our questions to ask a builder in Queensland.