The conventional sequence feels logical. Appoint an architect, develop the design, complete the documentation, then invite a builder to price it. The problem is that by the time a builder sees completed drawings, almost every decision that drives cost has already been made. Structural systems, material specifications, basement configurations, full height glazing, dry basement setouts, brick detailing, energy rating requirements, ceiling heights, external envelope details. All of it is locked in. If the price comes back over budget, the options are redesign, scope reduction or proceeding at a cost that was not anticipated. Each of those outcomes carries a real price in time, in fees and sometimes in compromised architecture.
A negotiated tender solves this problem. But it only works properly when the builder is involved early enough to help the client and architect make the right decisions based on financial outcomes and practicality.
The design journey is longer than most clients expect
Before a single piece of ground is broken, an architectural home in Melbourne typically moves through a process that takes between 12 and 18 months from concept design to construction commencement. Understanding this sequence matters, because knowing where cost certainty fits into it determines whether you arrive at construction with confidence or with unwelcome surprises.
The journey generally looks like this.
It begins with concept design, where the architect develops the spatial ideas and overall design direction based on your brief. This stage is exploratory and decisions are still flexible. In my experience, it is the most valuable moment in the entire process for a builder to be involved. Not to direct the design, but to help the client and architect make informed decisions based on what things actually cost and what is practical to build.
From concept, the architect develops the design further into a set of town planning drawings. These are the drawings that go to council for approval. Before they are submitted, I always recommend that preliminary engineering is already underway. Engaging a structural engineer at this stage, rather than after planning approval, allows footing and structural assumptions to be incorporated into the early pricing. A feasibility budget prepared without engineering input is a budget built on assumptions that can be wrong in ways that are both significant and avoidable.
Town planning is then submitted. For most architectural homes and renovations, a planning permit is required. The majority of the homes we build sit within heritage overlays or planning zones where council review is mandatory. This process typically takes between one and four months depending on the council and the complexity of the application. Objections from neighbours extend it further. The average in our experience is closer to 60 days for a straightforward application, but that is the optimistic case.
Once planning approval is granted, the architect develops the full construction documentation set. Interior design, joinery design, material and finish schedules and engineering documentation are all finalised and coordinated at this stage. This is also when we refine pricing from a preliminary feasibility assessment to a formal tender position ready for contract execution.
Construction then commences.
That entire journey, from first meeting with your architect to the day we start on site, is 12 to 18 months on a well-run project. On a project where the budget is not tested until the end of the process, it can be significantly longer.
Why a quantity surveyor is not enough at this stage
A common response from architects and clients is to engage a quantity surveyor at concept stage for early cost advice. A QS provides useful high-level cost data, but there is an important limitation that is often misunderstood.
A quantity surveyor works from measurements and rates. They can estimate the cost of a building based on area, materials and historical benchmarks. What they cannot do is assess the technical and buildability implications of specific design decisions before construction documentation exists. Structural sequencing, basement methodology, envelope interfaces, long lead procurement and site-specific constraints all require practical construction knowledge to assess properly. That is the builder’s role, not the QS’s.
Engaging a builder at concept stage does not replace a QS. The two roles are complementary. But relying on a QS alone before town planning submission means the budget has been tested against numbers without being tested against the building. Those are two very different things.
The town planning problem most clients do not see coming
The reason budget certainty before town planning submission matters so much is not just financial. It is a program decision with consequences that ripple through the entire timeline.
If a home goes to town planning at a budget that cannot be achieved, any changes required to bring it back within budget will almost certainly require an amendment to the planning permit. That amendment restarts a significant part of the approval process. In our experience, changes made after a planning submission has been lodged add approximately three months to the program. Sometimes more.
And the threshold for what triggers a resubmission is lower than most people expect. It is not just major structural changes. Altering a skylight, changing an external material finish, modifying a window configuration or updating a paint colour on the exterior can all require the permit to be amended before construction can proceed.
Getting the budget right before the town planning drawings are submitted is not a preference. It is the single most time-efficient decision you can make in the entire process.
Where we fit into this journey
The conventional approach places the builder at the end of the design process. The negotiated tender approach places us at the beginning of it.
At concept stage, we provide early feasibility pricing based on the developing brief and preliminary drawings. We do not price a project once and move on. At TCON, we typically price a project four to five times as the design develops and decisions are progressively resolved. Each round of pricing reflects the current state of the design, tracks changes and keeps the budget position live and accurate.
By the time town planning drawings are ready to submit, the budget is not an estimate based on a sketch. It is a figure that has been tested and refined across multiple rounds of documentation, incorporating preliminary engineering assumptions and benchmarked against current market rates for trades and materials.
This stage is referred to as early contractor involvement, or ECI. I want to be clear about what this means in practice. The architect continues to lead the design. What changes is that the design team has access to practical construction knowledge while the design is still evolving, and the client has a reliable cost position before committing time and fees to the planning process.
The cost of our involvement during ECI is not an additional project expense. It is credited back in full against the construction contract when the project proceeds to build.
What we contribute during early involvement
The value of early involvement is specific and practical, not just advisory.
Structural sequencing decisions that affect program. Waterproofing interfaces that need to be resolved before the external envelope is documented. Basement configurations where excavation methodology has significant cost implications. Glazing systems with 14-week fabrication lead times that need to be planned from the outset, not discovered six weeks before they are needed on site.
Beyond the technical, procurement planning at this stage is equally important. Natural stone requires slab selection and specialist fabrication lead times. Custom joinery has extended manufacturing schedules. Bespoke steelwork and architectural glazing are fabricated to specific dimensions and cannot be rushed. Identifying these items at concept stage and building them into the program from the beginning is one of the most practical things we can do for a project. Finding them late is one of the most expensive.
How early involvement leads to a negotiated tender
A project that begins with early builder involvement at concept stage transitions naturally into a negotiated tender as the design matures. This is the procurement pathway I recommend for architectural homes and renovations in Melbourne.
A negotiated tender is a structured pathway for aligning scope, design, budget and procurement strategy before the construction contract is signed.
Based on our historical estimating data, feasibility budgets prepared through this process have typically landed within approximately 10 percent of the final contract value where project scope remained consistent. That level of accuracy reflects disciplined estimating, trade benchmarking and the cumulative effect of pricing the project multiple times as the design develops. It is not achievable when a builder first engages with a project at completed documentation stage.
Getting it right from the start
Whether you are building a new home, undertaking a significant renovation or extending an existing property, the principle is the same. The earlier we are involved, the more useful our input is, the better the budget position when it matters most, and the less risk there is of the process being extended by avoidable changes after planning approval.
A 12 to 18 month design journey does not have to be uncertain. Managed properly, with the right people involved at the right stages, it becomes a process where budget, design and program stay aligned from beginning to end.
If you are at concept design stage or thinking about starting a project, reach out. The earlier the better.
