Volume builder, custom builder or architect for a Melbourne home?

By Barbara Yerondais
Sep 23, 2026

Answering: Volume builder, custom builder or architect: who should deliver your one-off new home in Melbourne?

Estimated reading time: 12 min read

If a display home already fits your block, a volume builder is the sensible buy; if you hold drawings detailed enough for three builders to price, a custom home builder is your path. If your block has a neighbour’s window, a slope, a small lot or a view no brochure imagined, bring in a registered architect before any builder, because on that site the design is the risk. BY Projects Architecture has delivered 400+ projects across Victoria, and a one-hour Feasibility Session helps test whether the project approach fits your block, budget and goals before moving into design.

You have walked the same display village twice, and the brochure price feels safe. Then the survey arrives, and the neighbour’s back deck sits squarely in the view from every upstairs window the standard plan offers. Overnight, the cheap certainty of a volume model becomes the most expensive maybe on the table, and you are choosing who gets to redesign the house around your actual block.

Choose badly one way and a plan fights your block through variations, or fails the overlooking and setback rules the moment it meets a real neighbour. Choose badly the other way and you commit design fees before anyone has tested what the site will hold. This guide picks up where our piece on whether to renovate or knock down and rebuild leaves off: you have decided to build new.

Key Insights

  • A volume builder sells a tested plan at a known price, and Consumer Affairs Victoria warns that changing the standard plan after you sign can be expensive.
  • A custom home builder prices a design, so the drawings decide the quote: compare at least three quotes on the same detailed plans.
  • An architect designs from the block out, and in Victoria anyone not registered with the Architects Registration Board of Victoria is not an architect.
  • Victoria’s overlooking test checks habitable room windows and decks for a direct line of sight, taken from 1.7 metres above floor level, into a neighbour’s habitable room window or secluded private open space within 9 metres (for that open space, the 9 metres is measured at ground level).
  • At Military Road in Avondale Heights, standard volume models could not handle local overlooking restrictions; the designed house captures its long views within council overlooking and setback requirements.
What decides it Volume builder Custom builder Architect, then a builder
Starts from A display range and standard plans Your brief, or drawings you bring Your block: sun, slope, neighbours, overlays
Who designs The builder’s team adapts a standard plan The builder, or a designer you engage A registered architect, independent of the builder
Best fit Regular blocks without neighbour, slope or overlay conflicts Owners holding detailed, priceable drawings Constrained blocks, views worth chasing, one-off briefs
Where cost moves Plan changes and extras after signing Prime cost items and provisional sums A design fee up front, fixed at engagement with us
The drawings Tied to the builder’s range May not transfer to another builder (copyright) Documented so several builders can price them
Permits The builder can obtain them; you remain responsible As the contract says; you remain responsible The architect can coordinate both permits

Table of Contents

Volume builders: a tested plan at a known price, if your block agrees

A volume builder is a good answer to a specific problem. Consumer Affairs Victoria (CAV) describes large building companies as selling from display homes: the plans exist, the process exists, and they can obtain your permits. On a regular block with a kind orientation and distant neighbours, that repeatable system buys you a known plan and a price you can read before you commit.

The fine print tests that certainty. CAV warns that the display home you walk through may not be the standard model, that a replica contract must include the home’s exact plans and specifications, and that changing the standard plan or adding extras after you sign can be expensive. If you customise, get the exact cost of the home as displayed and the cost with your changes, and have every change specified in writing. The builder also needs a soil report and foundation data to price the footings, so treat earlier figures as a starting point.

The deeper question is the block. A standard plan is drawn to suit many sites and none in particular, and every change that makes it fit yours (flipping it for the sun, raising a sill for a neighbour, stepping it down a slope) is a variation to a system built to repeat. Stack enough of them and you are buying a custom house one variation at a time, with nobody designing it as a whole.

Custom builders: a design priced and built, as good as its drawings

Custom home builders in Melbourne sit between the catalogue and the architect. Some design in-house; others build a design you bring, and CAV confirms either route: the builder may supply the plans and specifications, or you can engage an architect, designer or draftsperson. Whatever the name on the sign, check the builder’s registration with the Building and Plumbing Commission, whose public search shows whether a builder is registered and for what type of work.

The drawings decide how good the quote is. CAV’s advice is to get at least three quotes on the same detailed plans and specifications. Three quotes on thin drawings price three different houses. Gaps get filled with prime cost items and provisional sums (allowances for fittings not yet chosen and work not yet priced), which CAV warns can blow your budget and cause delays.

Design-and-build raises one more question: who owns the drawings? CAV warns that when a builder’s pre-construction agreement includes developing the design, copyright may stop you using those plans with another builder, and you may not get a refund for them. That is the practical case for separating design from construction on a one-off home. Our guide to fixed-fee architecture explains what that cost certainty buys.

Architects: when the block itself is the brief

An architect starts where a catalogue cannot: your sun, your slope, your street and the people next door. Anyone not registered with the Architects Registration Board of Victoria (ARBV) is not an architect, so check the register first. The ARBV lists selecting sites, feasibility studies and coordinating planning and building permits among architects’ work.

For a single house, Part 5 of the Building Regulations 2018 sets the siting tests that can sink a standard plan, including side and rear setbacks and overlooking. Under regulation 84, a habitable room window or a raised deck or balcony must not give a direct line of sight into a neighbour’s habitable room window or secluded private open space, tested from 1.7 metres above your floor, 45 degrees either side of the window, out to a horizontal distance of 9 metres (measured at ground level where the view lands in their secluded private open space). For a window, a 1.5-metre offset from theirs, a sill at least 1.7 metres high, obscure glazing below that height or a fixed screen no more than 25 per cent open will comply, and a raised deck or balcony can comply with the same kind of screen. A design that does not comply needs the council’s report and consent as part of its building permit application.

Lot size decides which rulebook applies. Planning Victoria’s single home code (Clause 54) covers a single house on a lot under 300 square metres in the main residential zones, where a planning permit is required and Clause 54 has its own overlooking standard. On larger lots, in most cases, the residential standards are assessed at the building permit stage. Either way, a display-home facade was drawn for no particular neighbour, and yours has one.

An architect-designed home usually costs more up front than a volume build. Our fee guide shows how much an architect costs in Melbourne in 2026, and our guide to sloping and difficult Melbourne sites covers blocks where slope is the constraint.

Military Road, Avondale Heights: where the volume models ran out

Military Road is a two-storey family home on our record in Avondale Heights. The site held long-range views from a second storey, and the owners first explored volume builder alternatives. They realised standard models would fail strict local overlooking restrictions and could not place the living spaces where the views were, so the brief called for a customised home that could capture the outlook, hold its privacy boundaries on a restricted footprint and still draw in light.

We re-planned the house around its sightlines. Upper-level glazing positions were mapped precisely, projecting window pods lock onto the key horizon views, and integrated louvred eaves balance summer sun control with privacy. The house captures those long views while satisfying council overlooking and setback requirements, and its stair was engineered for a future lift, so the family can age in place without structural remodelling. Here the constraint became the design. If your block puts the best view and the nearest neighbour on the same side, expect the same collision, and price the design before you price the build.

How to choose your path before you sign anything

The best time to choose a builder is after you know what your block will hold, and three questions tell you which path you are on.

  1. Does a catalogue plan fit this block without a fight? Pull a planning property report for the zone and overlays, check the lot size against the 300-square-metre line, and look hard at where the neighbours’ windows, decks and gardens sit. If it fits, a volume builder may be your best value.
  2. Do you hold drawings detailed enough to price? Then a custom builder and three comparable quotes will tell you what the house costs. If not, whoever draws the plans is shaping the quote.
  3. Is the block, the brief or the budget still open? Then start with design and feasibility, and choose the builder once the house exists on paper.

That third answer is where our fixed-fee method fits. After the Feasibility Session, our staged design starts with schematics and two sketches, one of the house your budget buys and one of the house the full wish list would cost, with the items between them listed so you decide where the money goes. Your builder then prices a house you have already chosen.

Closing

Choose a volume builder when your block and brief suit a catalogue plan, a custom builder when you hold drawings good enough to price three ways, and an architect first when the block itself is the problem to solve. In Melbourne, the overlooking test, the setbacks, the lot size and the views decide more of that than any brochure. Led by Barbara Yerondais, FRAIA, with 35+ years in practice, BY Projects Architecture starts every new home at the block; see how in architect-designed homes in Melbourne.

Frequently asked questions about builders, architects and new homes

Q: Is an architect-designed home more expensive than a volume build?

A: Usually, up front. The fee buys a house fitted to its site and drawings detailed enough to price, while a volume build spreads its design across a catalogue. On a regular, unconstrained block a volume plan can be the right value; on a constrained one, a standard plan reworked through variations can cost more than it saved. Our fees are fixed from engagement.

Q: Can a custom home builder build a house an architect has designed?

A: Yes. Consumer Affairs Victoria notes that a builder may supply the plans and specifications, or you can engage an architect, designer or draftsperson to prepare them. Architect-led documentation is drawn so several builders can price the same house, which is how its advice to compare at least three quotes on the same detailed plans works in practice.

Q: Do I need a planning permit to build a single new house in Melbourne?

A: It depends mainly on the lot and the zone. Under Planning Victoria’s single home code, a single house on a lot under 300 square metres in the main residential zones needs a planning permit, assessed against Clause 54. On larger lots, in most cases, the residential standards are assessed with the building permit under the Building Regulations 2018. Another provision, such as an overlay, can also require a permit, so start with a planning property report.

Q: What happens in a Feasibility Session, and is there any obligation?

A: It is a full one-hour session, in person or on Zoom, with Barbara Yerondais, FRAIA. You talk through your block, brief, budget, logistics and planning timeline. There is no obligation to engage us, and you leave with clarity before you commit to any builder or design contract.

Want a straight answer about your block?

BY Projects Architecture designs new homes across Melbourne and Victoria, from first homes on new blocks to replacement homes on established streets. Bring your survey and the display-home brochure you are weighing to a Feasibility Session, and test both against your block before you sign anything.

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About the Author

Barbara Yerondais, FRAIA, is the founder of BY Projects Architecture. With 35+ years of experience, she specializes in sustainable, community-focused design and heritage restoration. A dedicated mentor and rower, Barbara balances her high-impact Melbourne practice with a passion for social inclusion and passive, energy-saving design.

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