What Is an O&M Manual?
An Operation and Maintenance (O&M) manual is the definitive reference document for operating, maintaining, and managing a building and its systems. It is produced at handover and should be a living document updated throughout the building lifecycle. In practice, most O&M manuals are either missing, incomplete, or never updated.
Applicable Standards
- ASHRAE Guideline 4 — Preparation of Operating and Maintenance Documentation
- CIBSE Guide M — Maintenance Engineering and Management
- BS 8210 — Guide to Facilities Maintenance Management
- SFG20 — Standard Maintenance Specification (UK)
- BSRIA BG 26 — O&M Manuals and Project Data
Required Contents
| Section | Contents | Why It Matters |
|---|---|---|
| Building overview | Description, floor areas, occupancy, design conditions, key contacts | Basic orientation for any new FM or engineer |
| As-built drawings | Architectural, structural, MEP, fire, IT as actually constructed | Essential for any maintenance, modification, or emergency response |
| Equipment schedules | Make, model, serial number, capacity, location, supplier, warranty for every major item | Enables correct spare parts, service contracts, lifecycle planning |
| Operating procedures | Start/stop sequences, setpoints, seasonal changeover, emergency procedures | Without these, operators guess or develop ad-hoc procedures |
| Maintenance schedules | PPM tasks, frequencies, competency required, spare parts, shutdown requirements | The foundation of preventive maintenance programmes |
| Commissioning records | Test results, design vs actual performance, deficiencies noted | Baseline for performance comparison throughout building life |
| Certificates | Fire system, electrical, lift, pressure vessel, environmental | Legal compliance evidence |
| Warranty information | Warranty terms, periods, conditions, supplier contacts, claim procedures | Warranty claims are time-limited and condition-dependent |
| Health and safety file | Asbestos register, residual risks from construction, maintenance hazards | Legal requirement in many jurisdictions |
| Emergency procedures | Fire, flood, power failure, gas leak, lift entrapment, bomb threat | Critical for building management team response |
Common Deficiencies
- Generic manufacturer literature only — no site-specific operating procedures or setpoints.
- Design drawings, not as-built — what was designed is not what was built. Changes during construction are not reflected.
- Never updated — O&M manual reflects handover day only, not 10 years of modifications.
- Paper only, no digital — locked in a cabinet, never referenced, eventually lost.
- Missing commissioning data — no baseline to compare current performance against.
- No maintenance schedules — just equipment lists without tasks, frequencies, or competency requirements.
What to Do When the O&M Manual Is Missing
- Equipment survey: Walk every plant room and record make, model, serial, capacity, location.
- Name plate data: Photograph every equipment name plate and compile into an asset register.
- Manufacturer support: Contact manufacturers with serial numbers to obtain maintenance guides.
- Drawing recovery: Check with original designers, local authority (approved drawings), and the building archive.
- Adopt SFG20 or similar: Use a standard maintenance specification as the basis for PPM schedules.
- Progressive build: Build the O&M manual incrementally as each system is serviced or surveyed.
References
Insights & Guidance
- A proper O&M manual contains: as-built drawings, equipment schedules, operating procedures, maintenance schedules, commissioning records, certificates, warranties, and emergency procedures.
- Most O&M manuals are either missing, contain only generic manufacturer literature, or were never updated after handover.
- Design drawings are not as-built drawings. Changes during construction mean the drawings you have may not match the building.
- When the O&M manual is missing: survey equipment, photograph nameplates, contact manufacturers, recover drawings from original designers.
- The O&M manual should be a living document updated with every modification, not a shelf ornament from handover day.
Without an O&M manual, maintenance teams operate blind. They guess setpoints, miss maintenance tasks, order wrong parts, and cannot demonstrate compliance. The O&M manual is the single most important document for building operations.
- Wrong maintenance — without manufacturer-specific schedules, tasks are missed or performed incorrectly.
- Lost warranties — failure to maintain per manufacturer requirements voids warranties worth significant sums.
- Compliance gaps — missing certificates and test records mean compliance cannot be demonstrated.
- O&M manual (physical and/or digital)
- As-built drawings marked with revision dates
- Equipment schedule/asset register
- Maintenance schedule per system
- Is there a physical or digital O&M manual accessible to the FM team?
- Is it current or does it only reflect original handover?
- Can the team quickly find operating procedures for key systems?
- Do you have a complete O&M manual?
- When was it last updated?
- Are the drawings as-built or design-stage?
- O&M manual compilation — building services consultant.
- As-built drawing survey — MEP surveyor.
- Asset register build — CAFM/CMMS consultant.