Multi-Project Resource Planning Explained

Single-project resource planning is straightforward: figure out who's needed, check their availability, assign them. Multi-project planning is where it actually gets hard, because the same senior engineer or designer often shows up as a dependency on three different projects at once, each with its own deadline and its own project manager who has no visibility into the other two. Without a portfolio-level view, everyone's plan looks fine in isolation while the actual person is quietly over-committed by 150%.

Why Single-Project Views Create Invisible Over-Allocation

If Project A's plan shows an engineer at 60% allocation and Project B's plan shows the same engineer at 70%, both plans look individually reasonable. Added together, that's 130% of one person's time, a commitment that's mathematically impossible to deliver on. This kind of over-allocation is invisible unless something is tracking that person's total commitment across every project, not just within any single one.

Building a Portfolio-Level View of Capacity

The fix is a resourcing view that aggregates a person's total commitment across all active projects, not a separate capacity chart per project. This requires project data to actually live in a connected system, or at minimum, a shared resourcing tool that every project manager updates consistently, since a portfolio view built from five project managers' separately-maintained spreadsheets is only as accurate as the least diligent one among them.

Prioritizing When Demand Exceeds Capacity

Multi-project planning eventually runs into a moment where total demand for a specific skill set exceeds total available capacity, and something has to give. Having an explicit portfolio prioritization (which projects get first claim on constrained resources when conflicts arise) prevents this from being resolved informally by whoever escalates loudest or has the most senior sponsor. Ideally this priority order is set at a leadership level before conflicts happen, not negotiated project by project in the moment.

Planning for Partial Allocation, Not Just Full-Time Assignment

Multi-project environments rarely involve people dedicated 100% to a single project. Most resourcing happens in fractions, someone at 30% on one initiative and 40% on another, with the remaining capacity absorbed by meetings, support work, and context-switching overhead that's easy to forget when adding up allocation percentages. Building in realistic overhead, rather than assuming 100% of someone's time is plannable work, produces estimates that actually hold up.

Keeping the Plan Current as Priorities Shift

A resourcing plan built once at the start of a quarter is stale within weeks, priorities shift, projects get delayed, new urgent work appears. Platforms that tie resource planning to the same system tracking actual project execution, like Sanplex, keep the resourcing view current automatically as project status changes, rather than requiring someone to manually reconcile a separate resourcing spreadsheet against what's actually happening across the portfolio.

Frequently Asked Questions

How do you spot over-allocation before it becomes a problem?

A portfolio-level view that aggregates each person's total commitment across all active projects, not just individual project plans viewed separately, is what surfaces this early.

Should resource planning account for meetings and overhead, not just project work?

Yes, assuming 100% of someone's time is available for planned project work tends to produce estimates that don't hold up once real overhead is factored in.

Who should decide priority when two projects need the same person?

Ideally this is set at a leadership or portfolio level in advance, rather than negotiated informally between individual project managers when the conflict actually arises.

How often should a multi-project resourcing plan be updated?

As close to continuously as possible. A plan that's only reviewed quarterly tends to be significantly out of date given how often priorities and project timelines shift in practice.

Is multi-project resource planning only relevant for large organizations?

No, even small teams running two or three concurrent projects with shared team members benefit from a portfolio view rather than planning each project in isolation.

Want to see a real portfolio-level view of your team's actual capacity?

Book a demo and bring your current project mix to the conversation.