An estimate: an informed early view

An estimate is an indication of the likely cost based on the information available at a particular time. Early estimates may use floor area, comparable projects and broad assumptions. As the design develops, an estimate can allocate cost to structure, envelope, services, joinery, finishes and external works.

An estimate is valuable for feasibility and design guidance, but it is not usually an offer to complete the work for that amount. Its reliability depends on the quality of the information, the relevance of the benchmarks and whether site conditions, project complexity and the intended standard of finish have been recognised.

A tender: a detailed offer against defined documents

A tender is a builder’s formal price submission based on a nominated set of drawings, schedules, specifications and consultant information. It should state the proposed price, programme, inclusions, exclusions, assumptions, allowances and validity period.

Tender prices are only comparable when multiple buildesr have priced the same scope. If documentation is incomplete, one builder may include an item another has excluded or allowed at a very different level. This is why the apparent lowest tender is not necessarily the lowest final cost. A disciplined tender review normalises the submissions and identifies gaps before appointment.

A fixed-price contract: an agreed contractual framework

A fixed-price contract establishes an agreed contract sum for a defined scope under stated conditions. The word “fixed” can be misleading if read in isolation. The final amount can still change through client variations, properly adjusted prime cost items and provisional sums, or other price adjustments permitted by the contract and Victorian law.

The contract documents therefore matter as much as the number on the front page. Plans, specifications, schedules, inclusions, exclusions, allowances and special conditions collectively define what has been priced. Consumer Affairs Victoria advises that major domestic building contracts must clearly describe the work and state the contract price, among other requirements.

Documentation is the bridge to certainty

Pricing certainty improves as design decisions are made and documentation is coordinated. A tender issued before structural, services, interiors and external works have been resolved will carry more assumptions and allowances. This can create a false sense of certainty: the contract may be fixed, but your intended scope is not yet fully represented.

Pre-construction collaboration can help. Builder input on sequencing, access, materials, long-lead products and specialist trades allows the design team to resolve buildability and cost questions before tender or contract.

How to assess any price proposal

First, confirm the exact document revision and scope used. Then review inclusions, exclusions, prime cost items, provisional sums and assumptions. Check whether GST is included and whether permits, temporary works, authority charges, service upgrades and external works have been addressed. Ask what market testing has occurred for key trades and suppliers and how long the price remains valid.

Finally, examine the process for variations and delay. A transparent proposal should explain margins, administrative costs, evidence of actual cost and any effect on the completion date.

The Nine in Six approach

Nine in Six tailors our pre-construction and contracting pathway to the project’s level of development and your priorities. Early estimates are treated as feasibility tools, not promises that are unsupported by detail. As documentation advances, assumptions are tested, key packages are reviewed and unresolved allowances are made visible. The aim is to enter construction with a well-understood scope, an appropriate contractual structure and fewer, if not zero, surprises.