Design and build in Melbourne: should you use one firm or a separate designer and builder?

Should I use one firm for design and construction, or engage a designer and a builder separately?

Search design and build Melbourne and most of what you find comes from one side or the other. Design practices explain the value of engaging a designer separately. Builders explain the value of keeping it in one firm. Both are describing the way they work, and it leaves you to weigh the two.

We should say plainly where we stand. Doug MacLeod, Founder and Director of Latitude 37, has operated the integrated route since 2006, because we believe it keeps the design, budget and construction decisions more closely connected throughout a custom home project. This article explains why, and what it means for you whichever route you choose. If you want the short definition of what a design-and-build firm is, our service page gives it.

How do the two routes differ?

In the separate route, you engage an architect or designer independently and appoint a builder separately. The designer develops the design with you, consultants such as engineers are brought in, and the documentation is completed and priced by builders. The designer may remain involved during tendering and construction, depending on the scope of their engagement. Either way, you hold two appointments, one with the designer and one with the builder.

In the integrated route, one firm designs, documents and builds the home. At Latitude 37 the design is developed by our in-house design team, and the documentation is prepared in house too. We do not outsource our drafting. Pricing develops alongside the design rather than after it.

Both routes can produce a well-resolved custom home. The differences sit across several considerations.

Design relationship. In the separate route, the designer is engaged independently. In an integrated firm, the designer sits within the business that delivers construction.

Builder selection. The separate route lets you tender completed documentation to several builders. With an integrated firm, the builder is generally chosen from the outset.

Cost feedback. In the separate route, cost information often becomes more detailed once design and documentation are complete. In an integrated firm, construction pricing can inform the design as it develops.

Coordination. Separate appointments mean the designer’s and builder’s roles need to be coordinated. In an integrated firm, that coordination happens within one organisation.

Design continuity. In the separate route, continuity depends on how involved the designer stays during construction. In an integrated firm, the design and construction teams remain connected throughout.

Accountability. In the separate route, responsibilities sit across separate appointments. In an integrated firm, greater responsibility sits with one firm.

Who each route suits. The separate route tends to suit clients who put independent design or competitive tendering first. The integrated route tends to suit clients who value continuity and want design and cost considered together from the start.

The rest of this article looks at the considerations that matter most in practice, starting with the one we have learned most about in 20 years of running an integrated model: where information gets lost between design and construction.

Why do hand-offs matter so much?

A custom home is a long chain of decisions, and each has a reason behind it. The living room faces north because of the winter sun and the neighbour’s second storey. The stair was widened because someone’s parents will visit often. The reasons are what allow a later decision to be made consistently with an earlier one.

A hand-off is any point where the brief moves from one person or team to another. A separated route generally involves more of them: from you to the designer, through detailed documentation and consultants, from the completed documentation to the builder, and then from the builder’s pre-construction team to its site team. Drawings travel well across those points. Reasons travel less well, because they tend to live in conversations.

The integrated route is designed to reduce those transfers. At Latitude 37 your Client Experience Lead holds the brief from the first design brief meeting through to handover. Your Designer reviews the documentation from start to finish so the design intent is carried through, and stays involved during construction through site visits and office discussions. Your Site Manager is introduced in our office before construction begins. Clients describe what that continuity is like in their own words.

Our in-house model is a large part of why this works. Our Designers, Interior Designers, Client Experience and Construction teams remain connected throughout the project, so design intent, your decisions and construction questions are discussed directly by the people who know your home. It also gives far greater continuity if an individual team member changes. In a separated route, how involved the designer stays during construction depends on how their engagement is scoped. Some stay on to review the work. Others have largely completed their role by the time construction begins. Clients who keep their designer engaged through construction reduce this gap, at the cost of a further appointment to manage.

This is the idea at the centre of the choice. The fewer times the reasoning behind a home has to change hands, the easier it is to keep design intent, cost and construction aligned. It is also a useful lens for assessing any builder or designer, whichever route you take. With fewer hand-offs, more rests on the firm you choose, so it is worth asking how its team is structured and who stays with your project.

When does an integrated approach help most?

The advantages of an integrated approach become particularly relevant under three conditions.

The first is complexity. A sloping block, a heritage overlay, a basement, a long span across an open living area. Each is a place where design and construction have to be resolved together, and where a design priced only after it was finished can come back over budget. When the people pricing the home work alongside the people designing it, the cost of a decision is understood when the decision is made. Our custom homes are priced this way, with an indicative build cost alongside the first concept.

At Waterfront in Patterson Lakes, the family’s early thinking included a basement. Because our design and construction teams were reviewing the project together, it was clear during design that building below ground would add complexity and cost without adding to the way the family wanted to live. The home was organised across three levels above ground instead, meeting the whole brief at a lower cost overall, and that decision was made on paper rather than after documentation. Waterfront is a 2026 finalist in the HIA Victorian Housing Awards, and the story of its brief is in our Knowledge Hub.

The second is duration. Over a project that runs for years, the reasoning behind decisions has to survive leave, staff changes and the ordinary fading of memory. A deliberate structure for continuity is what carries it.

The third is your own time. Managing two professional relationships takes attention across the whole project. If that time is scarce, having design and construction within one team can make the process easier to live with.

What if you already have your own designer?

The two routes are not always either-or. Some clients arrive with a design already prepared by their own designer or architect, and some want to keep that designer involved as their advocate. Neither rules out building with Latitude 37.

We can accommodate an externally designed home in most circumstances. It would be rare for us not to consider one. Our role is to guide you through the questions that turn a design into a buildable, costed project: whether it can be built as drawn, what the scope actually includes, whether it meets compliance requirements, and what it is likely to cost. Working through those with you early is where much of the value lies, because issues found on paper cost far less to resolve than issues found on site.

When might the separate route suit you better?

There are two situations where the separate route, or a different builder, may be the better fit.

The first is when you want to compare several builders against the same documentation. A tender is built for that. The important question is whether the prices are based on the same scope, assumptions and allowances, because a lower figure is not necessarily a like-for-like figure. We have set out what to check when one quote is materially lower than another in a separate article. Price is one part of the decision. Design, documentation, service and continuity sit alongside it, and they are worth weighing as carefully as the figure itself.

The second is budget. Latitude 37 works within a defined custom home investment range. If your budget sits below it, we will tell you early, rather than let you invest time in a process that will not fit.

How do control, pricing and time compare?

Control. In the separate route, more of the decisions that sit between design and construction may come back to you, or to an adviser you appoint. In an integrated model, those conversations happen within the same team, while you remain involved in the decisions that shape your home. Worth asking: who resolves a question that falls between the design and the build?

Pricing. In the separate route, builder pricing is typically established once sufficient documentation is available, and a tender can allow you to compare several builders. In the integrated route, an indicative cost comes with the first concept and is refined as the design develops. At Latitude 37 that leads to a fixed-price building contract based on resolved and checked documentation. Worth asking: when will I first see a cost, and what will it be based on?

Time. In the separate route, design, documentation, pricing and construction tend to run one after another. In the integrated route, design, documentation and pricing develop together. At Latitude 37, once the design of the home is settled, the detailed documentation, interiors and selections are completed with you before contract. Whether that saves calendar time depends on the project. Worth asking: what is the timing based on?

These questions help you understand how a firm operates beyond its portfolio and marketing language. Our article on four questions to ask a builder beyond the portfolio applies to either route.

Latitude 37 designs and builds across six Melbourne regions, from the Inner North and East through to the Mornington Peninsula, and is a member of the Housing Industry Association and the Master Builders Association. Whichever route you choose, the useful test is not simply which model sounds easier. Ask where design responsibility sits, when construction cost enters the conversation, who resolves issues between design and construction, how often the thinking behind your home passes between people, and who remains accountable throughout.