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CONSEIL·LAB
Platforms & Systems

Core & Legacy System Replacement

The case that funds a core or legacy replacement on risk retired and cost removed, not on "it is a ticking time bomb."
01What it is

Replacing a core or legacy system retires risk and unlocks change, but it is expensive and disruptive. Finance wants the carried risk and cost quantified, not a warning. We build the case that funds the right sequence.

02When a business case is required
Finance will not fund a replacement on "it is a risk."
Support, skills, or hardware for the system are running out.
The legacy system is blocking other funded initiatives.
The client is weighing rebuild, replace, or contain.
A capital gate stands in the way.
03What we build into the case
A baseline: current cost to run and maintain, incident and key-person risk, and the change it blocks.
A benefit model in risk retired, cost removed, and change unlocked.
Option analysis: contain, replace, rebuild, against the baseline.
NPV, payback, sensitivity, and delivery-risk weighting.
A named owner accountable for the outcome.
04What you walk away with

The full roadmap. Phased implementation with gates, the tooling, and the roles to staff each phase, so the client sees exactly what they are getting into and how it gets done. That clarity is what turns a maybe into a yes.

The presentation

A board-ready deck

The case built to present, in your template and under your brand, that carries the number through the committee. We build it, and where it helps we are in the room with you.

The project document

A living project memory

The case written in full and structured to load into Microsoft Copilot. Mid-project, anyone can ask why a decision was made or what a number rests on and get the answer from the case itself. It stops being a document that dies at approval.

05The benefit
Funded, not deferred
The work gets approved this cycle instead of parked another quarter.
Priced fixed
You bid the outcome, not a day rate that races to the bottom.
Higher-value work
You sell the transformation, not the headcount.
CFO buy-in on record
A number the finance function signed off, to point to at every later gate.
The client has a map
They walk in knowing the path, which is what makes them commit.
Delivered as yours
Your brand, your relationship. We never appear as a vendor.
06The cost of not doing it
The replacement is sold on fear and never funded.
A big-bang scope with no envelope overruns or fails.
The old logic is rebuilt faithfully, including its problems.
With no baseline, the risk-retired case is unprovable.
The system fails before the deferred decision is made.
07Proof

Delivered across tier-1 Canadian financial services and insurers.

Client names are confidential and never disclosed. The track record is anonymized for exactly that reason.

See if it fits

Want to see what a core business case looks like?

A quick, no-pressure call to see if this is a fit for your firm. Bring a live account if you have one; you do not need to.

Book a fit callsales@conseillab.com