Retro-commissioning software that does the investigation for you
The hardest part of retro-commissioning isn't the fixing. It's the finding.
A typical engagement spends most of its budget on investigation - pulling trend logs, chasing point names, walking plant and reverse-engineering what the BMS has been quietly doing wrong for years. The findings are real. Finding them by hand is what consumes the margin.
of air handling units are carrying a fault on any given day.
Lawrence Berkeley National Laboratory, analysis of more than 60,000 pieces of HVAC equipment.
Weeks of billable hours before a single fix
Your engineers start with the answer sheet
Built for firms that deliver commissioning
One platform across the whole engagement: investigate in days rather than weeks, implement with evidence rather than opinion, and verify that every fix actually landed. The difference between "we recommended 31 actions" and "we resolved 31 actions, and here is the verified result of each."
Cross-vendor from day one
One fault list across Siemens, Schneider, Honeywell, Trend and mixed legacy estates. No controller replacement, no per-site rebuild - read-only access to data the BMS already holds.
Multi-client visibility
Run every engagement from one platform: portfolio views per client, engagement-level fault tracking, and reporting your clients can take to their own stakeholders.
Prioritised by impact, not noise
Faults ranked by energy cost, comfort impact and equipment risk - so your scope discussions are grounded in the client's own data rather than judgement calls they can push back on.
Verification that closes the loop
PEAK stays connected after handover, confirms each fault cleared and stays cleared, and catches the drift that quietly erases retro-commissioning savings.
Monitoring-based commissioning: the complete 2026 guide
Why buildings drift, what a real MBCx program looks like, and how to evaluate the platforms that support it.
RCx, MBCx and ongoing commissioning
The three models differ in one respect above all: how long the monitoring stays on after the engagement ends.
A fixed-term project that returns existing systems to intended performance
Stops when the project closes
Savings decay as the building drifts back
RCx with the analytics left running afterwards
Continuous, with faults raised as they appear
A project becomes a recurring service line
MBCx with assignment, escalation and verification built in
Continuous, with every fault tracked to close-out
That the fix held, on data the client can see
How FDD unlocks growth for engineering consultancies
For firms turning commissioning projects into a recurring service line on top of fault detection and diagnostics.
What it looks like when the loop closes
Data-driven workflow drives a speedy AHU fix
A fault diagnosed from trend data and resolved in days - without a diagnostic site visit.
Read the story →Rectifying overnight operation
The classic retro-commissioning finding - plant running out of hours - caught, fixed and verified through PEAK.
Read the story →Anomaly detection catches post-project drift
The drift that erases RCx savings - caught because monitoring continued after the project ended.
Read the story →Across the industry, organisations running continuous fault detection and diagnostics achieve a median 8% energy saving (Lawrence Berkeley National Laboratory, 550 buildings). PEAK is rated 4.8 on Capterra.
Turn a one-off project into a standing service
Retro-commissioning has a built-in expiry date: performance drifts the day the engagement ends. That is bad for the building - and worse for your revenue model, because it makes RCx a procurement event instead of a relationship.
With PEAK staying connected after handover, your RCx project becomes the on-ramp to monitoring-based commissioning: continuous fault detection, a review cadence you own, and verified savings your client can report year after year. Your firm moves from selling investigations to operating a service - recurring revenue for you, sustained performance for them.
The engagement delivers real savings - then performance drifts the day the monitoring stops, and the value quietly erodes until the next procurement cycle.
The firm that turned commissioning projects into a platform business
Aero Performance Group, a division of the Hill Group, has been one of the leading retro-commissioning and MBCx providers in the ComEd utility program since it began - saving its clients more than $26.5M in energy costs. Before PEAK, its engineers reviewed BMS data manually. On PEAK, Aero runs commissioning across its US portfolio from one platform: faults surface automatically, savings are verified for utility incentive claims, and fixed-term projects keep converting into long-term engagements.
The platform's real-time monitoring, powerful FDD, client-friendly dashboards, and exceptional support from the CIM team have helped us to scale quickly, improve client engagement, and maintain a high standard of operational excellence across our growing portfolio.
Frequently asked questions
Does PEAK replace the RCx engineer?
No. PEAK does the data work - detection, diagnosis, prioritisation and verification. The engineering judgement, client relationship and implementation remain yours. Firms use it to redeploy engineering hours from investigation to resolution.
Does it work on old or mixed-vendor BMS estates?
Yes - that is the normal case, not the exception. Serial networks are bridged with a router, closed systems are reached through a gateway or vendor interface, and read-only access means no control-system risk. An old BMS usually means more findings, not fewer.
How fast is a building connected?
Typically two to eight weeks from data access to a meaningful first fault list, depending on BMS accessibility and point naming quality. Subsequent buildings in a portfolio connect faster.
What is the difference between RCx with PEAK and monitoring-based commissioning?
Retro-commissioning is the point-in-time engagement; monitoring-based commissioning is what it becomes when the monitoring stays on. PEAK supports both - most partners start with an RCx project and transition the client to a continuous service. Read the complete MBCx guide.
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