A plumbing price that includes below-ground drainage but excludes fixtures is not comparable with one that includes the full hydraulic scope. Yet both can look competitive on the tender summary. That is why learning how to prepare trade packages properly matters: the package defines what each subcontractor is actually being asked to price, before a scope gap becomes your cost.
For residential builders pricing a granny flat, dwelling, duplex or triplex, trade packages turn drawings into an organised buying process. They give each trade the same measured scope, the same documentation and the same assumptions. The result is cleaner quote comparisons, faster follow-up and less tender risk sitting unnoticed in the margin.
Start with a measured BOQ, not a drawing set
A trade package should not ask a subcontractor to "price plans attached". That approach transfers the take-off effort to every trade, produces inconsistent interpretations and makes tender levelling slow. One contractor may allow 85 square metres of tiling; another may miss the laundry splashback entirely. Neither price tells you much until you unpack it.
Start with a measured bill of quantities structured around the way the project will be bought and built. Quantities should be traceable to the drawings, schedules and specification, with clear units such as square metres, linear metres, each and cubic metres. A good BOQ separates labour, materials, plant and specialist supply where that separation affects procurement or comparison.
The level of detail depends on the package. A concrete package needs excavation, piers, footings, slab areas, thickened beams, pump allowance and access considerations. A carpentry package needs framing, trusses, timber or steel members, tie-downs, eaves framing and any engineered connection requirements. Do not force every scope into the same generic template.
At DA stage, some information will still be incomplete. Record that openly rather than disguising uncertainty inside measured quantities. Provisional allowances belong in a separate, visible section so they can be confirmed, revised or carried as a tender risk item.
How to prepare trade packages that produce comparable quotes
The objective is simple: every invited trade should receive enough information to price the same scope on the same commercial basis. That does not mean every package must be lengthy. It means the instructions are unambiguous.
Each package should contain these core items:
- the relevant drawings, schedules, specifications and engineering details
- an itemised scope or BOQ with quantities and pricing units
- inclusions, exclusions and interface responsibilities
- project constraints, programme expectations and site conditions
- a return schedule that tells the trade how to submit its price
The scope section is where tender outcomes are won or lost. State whether supply, delivery, installation, fixings, certification, waste removal, protection, temporary works and final clean are included. If an item is by the builder, nominate it. If it is by another trade, make the interface clear.
For example, a plastering package should state whether insulation is installed by the plasterer or supplied and installed under a separate insulation scope. The waterproofing package should identify shower recesses, hob details, balconies, planter boxes and any requirement for certification. The electrical package should distinguish base electrical rough-in from feature lighting, data, security, solar, appliances and temporary power.
Vague wording such as "complete as required" is not commercial protection. It is an invitation for different interpretations. Use the plans to define the work, then use the package to remove the ambiguity that plans alone do not resolve.
Build packages around trade interfaces
Most tender-stage omissions occur between trades, not within a single trade. Builders should actively test every handover point before issuing packages.
Consider external works. Does the concreter include the porch and paths? Is excavation included with landscaping, civil works or concrete? Who supplies and installs stormwater pits, grates and charged lines? Is temporary fencing a preliminaries cost or an external works allowance? The answer can vary by builder and subcontractor market, but it must be nominated once.
The same applies internally. Cabinetmaker, tiler, waterproofer, plumber, electrician and painter all touch a bathroom. Set the sequence and inclusions clearly: framing and noggings, waterproofing substrate, fixture set-outs, shower screen coordination, tile trims, accessories and final fit-off. A package does not need to solve every construction issue, but it should expose the decisions that affect price and programme.
For duplexes and triplexes, also identify whether quantities are per dwelling, per building or across the site. Shared driveways, fire separation, services, metering and common external works are regularly misunderstood when documents are issued without a clear pricing breakdown.
Separate measured scope from provisional allowances
Measured work and allowances should never be blended into one trade total without explanation. A measured quantity is derived from the available documentation. A provisional allowance is a controlled placeholder for an item that cannot yet be properly measured or specified.
Common examples include rock excavation, authority upgrades, latent site conditions, acoustic requirements pending consultant detail, premium selections and incomplete hydraulic design. These may be legitimate tender allowances, particularly on DA-stage documentation. They are not reasons to make the rest of the estimate less precise.
Describe each allowance with its basis, what it includes, what it excludes and how it will be reconciled. If you have carried an allowance for a retaining wall because engineering is incomplete, nominate an assumed length, height, system and access condition. This gives the builder a usable risk position rather than an unexplained lump sum.
This distinction also improves conversations with clients and consultants. You can show where the cost is measured and where it remains subject to design development, rather than defending a number after the package has gone to market.
Set a return format before packages go out
A subcontractor price is only useful if it can be levelled quickly. Ask trades to return pricing against your BOQ line items or pricing schedule, rather than submitting a single total with a short email qualification.
Require the trade to nominate exclusions, alternatives, lead times, GST treatment, validity period and any qualifications. For material-sensitive scopes such as roofing, windows, structural steel and joinery, ask for confirmation of the product basis and lead time as well. A low price based on a substituted product or an unrealistic lead time is not a saving.
Give trades enough time to review the package. The appropriate pricing period depends on package size, documentation quality and market conditions. Pressing every subcontractor for a next-day return may get a number, but it often produces broad allowances and protective exclusions. For a live tender, prioritise the higher-value and higher-risk trades early so there is time to clarify scope before your submission is due.
Include programme and site information
Subcontractors price risk, not just quantities. A complete package should provide the anticipated construction programme, site address or location context, access limitations, working hours, staging requirements and any known constraints.
Regional work deserves particular attention. Freight, travel, accommodation, local labour availability and supplier coverage can materially change a trade price. A rate card may provide a sound estimating baseline, but current local subcontractor feedback should refine the tender position where the project is outside a major metro market.
Programme information is also a procurement tool. If windows have a 14-week lead time, that needs to be visible before contract signing, not when framing is complete. If a masonry trade needs uninterrupted access across multiple dwellings, sequence that requirement into the programme and package instruction.
Review packages before issue
Before sending anything out, conduct a short package review against the estimate. Check that every cost code has an owner, that quantities reconcile to the BOQ, and that no scope is duplicated across trades. Then review the trade interfaces and provisional allowances with the same discipline.
A useful test is to ask: if every invited subcontractor priced exactly what this package says, would the complete building be delivered? If the answer is no, the gap is not a subcontractor problem. It is a pre-construction problem that should be resolved or carried visibly before tender.
An estimating pack built from the plans can shorten this workflow considerably. EstiFlow provides editable BOQ workbooks, subcontractor pricing packs, a Cost Estimate Report and an indicative construction programme from DA-stage documentation, so the builder starts with measured scope rather than a blank spreadsheet.
The strongest trade packages do not chase the lowest number. They create a clean market response, make qualifications visible and let you choose subcontractors with a proper view of cost, scope and programme exposure. That is how a tender becomes a buildable commercial position rather than a hopeful total.