Check the scope at the interfaces
A quotation can include heating and cooling, electrical work and plumbing while still leaving one question unanswered: who connects each system to the others? The scope review should focus on precisely these points. Installed equipment needs a power supply, drainage where applicable, controls, access and checks before it can deliver the intended service.
For the builder and technical team, it helps to treat each interface as a handover between two work packages. Having both trades named in the quotation is not enough. You need to know where one task ends, the condition in which it is handed over and who accepts that handover.
Build a short responsibility matrix
Select the items that involve several trades. For each one, list supply, installation, connection, testing and documentation. Identify the person or company responsible for each task and the person who resolves questions. The matrix can be a simple spreadsheet linked to the current drawings.
Avoid words such as complete or finished unless they describe a result that can be checked. For example, provision for a power supply might mean an empty conduit, an installed cable or a tested connection. These are different situations and should be distinguished before scheduling the next team’s arrival.
Example: a fan coil above a suspended ceiling
During a coordination review, use this hypothetical example to work through the connections instead of treating it simply as the purchase of a unit:
- Who supplies and secures the unit, and what supporting structure the building works must provide.
- Who carries out the water connections, insulation and condensate drainage.
- Who provides the power supply and who makes the required electrical connection.
- Who installs the controls, defines how they operate and checks the response in the zone.
- Who incorporates the access panel into the suspended ceiling and checks that it provides access to the equipment.
Include ancillary work and access conditions
Builders’ work, penetrations, supports, seals and making good also need clear responsibilities. They should not be left implicit because they appear minor. Even a well-made connection can require a finished surface to be reopened if its route or access has not been coordinated.
Link these tasks to the conditions needed for each intervention: available space, access, confirmed levels and protection of completed elements. A start date does not replace these requirements. If something is missing, identify who will resolve it and how readiness will be communicated.
Agree how the complete installation will be checked
Alongside checks within each trade, define the tests that require several participants. A thermostat command, for example, should produce the intended response in the system it controls. If a problem occurs, it helps to know who coordinates the investigation and how its resolution is recorded.
Commissioning and documentation should be specific deliverables. Test criteria are defined by the project and the particular installation; a coordination checklist helps organise them but does not replace their technical definition.
Keep the matrix up to date throughout the works
When equipment or a construction solution changes, review its connections and responsibilities as well. An alternative product may need a different power supply, another access-panel position or an additional control accessory. Update the sheet and communicate which revision is current.
At Red Málaga, we bring several installation trades together and specify the work we undertake in the proposal. Coordinating our packages with the builder and technical team allows these interfaces to be addressed as part of the project. Having one company for several trades makes communication easier; a written scope remains essential.
It is also worth agreeing what a partial handover means. A section that is installed but not yet connected or tested should be identified as such, so whoever plans the next task knows its actual status. The matrix can include an outstanding-conditions column to prevent the physical presence of an item being mistaken for completion.
More common questions
Does this matrix replace drawings and quantities?
No. It complements them by clarifying tasks and handovers between participants. If it reveals an unresolved technical issue, that issue must be addressed in the relevant documentation before the affected work proceeds.
Sources and technical reading
Some source documents are available in Spanish.