Start with the boundary: record the information and revisions used for pricing, then list inclusions, exclusions, interfaces, programme assumptions and handover responsibilities in language that commercial and site teams can both follow.
A ventilation package can cross several trade boundaries. The drawings may show where a duct route finishes without confirming who provides the opening, connection, insulation, controls interface or final testing. Those points should be addressed before mobilisation wherever possible.
Separate system geometry from package responsibility
Layouts, sections and schedules describe what is intended to be installed. They do not always allocate every responsibility. A scope schedule or responsibility matrix can sit alongside the drawings and state which party owns each element.
The record should use the latest available information and identify any item that remains subject to design development or confirmation. If a clarification changes the agreed package, update the scope rather than leaving the answer in a separate email chain.
Boundaries to record
- Ductwork and terminalsState which ductwork types, fittings, grilles, diffusers and terminals are included.
- Plant and connectionsIdentify the connection points and who supplies, positions or connects associated equipment where relevant.
- Supports and accessClarify support responsibilities, access arrangements and any powered access or lifting assumptions.
- Openings and builders' workRecord who provides openings, making good and other interfaces with the building fabric.
- Insulation and controlsState whether insulation, wiring or controls connections sit inside or outside the installation package.
- Testing and handoverDefine any testing, commissioning assistance, labels, photographs or close-out information included in the agreed scope.
- Protection and completionState who protects installed work, deals with agreed snagging and returns for second-fix or final connections where these activities are required.
Use a responsibility matrix for the interfaces
A simple responsibility matrix can prevent repeated discussions later. List each interface and identify who designs, supplies, installs, coordinates, tests and records it. The format can be brief; its value comes from making the hand-offs visible.
Typical interfaces include fire and volume-control dampers, attenuators, insulation, controls connections, plant connections, access panels, penetrations and making good. The correct allocation varies by project. The point is not to prescribe one answer but to ensure the project team has agreed an answer.
Questions to close before award
Which drawing revision forms the pricing basis? Are equipment and material responsibilities stated? Which areas will be available, and in what sequence? Are there restricted working hours, storage constraints or access rules? Who coordinates unresolved service clashes? Who approves changes? What handover information is expected from the installation package?
Not every question has to be fully closed on day one. Open items should be recorded with an owner and a target date so they do not disappear between commercial review and mobilisation.
Connect the scope to programme and procurement
The award value is only one part of the decision. The project team also needs to know what information the contractor relied on, when areas must be released, which inputs are required from others and what evidence will be available at handover. These points affect whether the package can be planned and monitored after award.
Competence and information management are receiving closer attention across the sector. Our 2026 subcontractor competence update explains why procurement teams are asking for clearer evidence alongside price and programme.
Keep the agreed scope usable on site
A concise scope is easier to use than a long document that hides the important boundaries. Give the contracts manager and site team access to the same agreed information, including clarifications and accepted revisions. At pre-start, check that the installation team has the same scope the commercial team awarded.
Cliventa's installation packages are reviewed against the available drawings, specification, scope, programme and project information. Final responsibilities remain subject to the written package agreed for each project. For enquiry preparation, use the ductwork quotation information checklist.