What is an O&M Manual?
An O&M manual — short for Operations and Maintenance manual — is a structured handover document that tells the building owner or facilities manager how to operate, maintain, and service the systems installed in a building.
When you complete an electrical installation, a fire alarm fit-out, an EV charging system, or any building services project, the principal contractor or employer will typically require an O&M manual as part of project closeout. Without it, practical completion can be withheld and final payments delayed.
O&M manuals go by several names depending on the project or client — O&M manual, operation and maintenance manual, building manual, handover pack, or project completion document. They are all broadly the same thing: a compiled set of documents that allows whoever takes over a building to understand, operate and maintain what has been installed.
Who Needs an O&M Manual?
O&M manuals are most commonly required on commercial construction projects, public sector projects such as schools and hospitals, and CDM-notifiable projects requiring a health and safety file under the Construction (Design and Management) Regulations 2015.
For electrical contractors specifically, O&M manuals are a routine deliverable. They are expected on almost every commercial project above a certain size, and increasingly on smaller domestic-commercial installations too. If you are a subcontractor, your main contractor will often require you to submit your O&M documents before they can close out the overall project manual.
Who is Responsible for Producing O&M Manuals?
Responsibility for the O&M manual ultimately sits with the principal contractor, but in practice each trade subcontractor is responsible for their own section — the documents relating to the systems they installed. The principal contractor or their documentation coordinator then compiles sections from all trades into a final manual.
On smaller projects, a specialist O&M manual service — like our O&M manual production service — may be appointed to compile and format the complete document.
What Goes in an Electrical O&M Manual?
The contents will vary depending on the scope of the installation, but a typical project manual includes the following sections.
1. Project Information
- Project name, address, and reference
- Client / employer and principal contractor details
- Electrical contractor details
- Project description and scope
- Relevant British Standards and regulations (BS 7671, BS 5266, BS 5839, etc.)
2. System Descriptions
- Overview of the electrical installation and its purpose
- Description of each system installed
- Operational overview — how each system works, how it is controlled, and what it serves
3. Design Documentation
- Electrical design drawings or schematics (as-built where applicable)
- Single line diagrams
- Load schedules and cable schedules
4. Equipment Data
- Manufacturer datasheets for all major items of plant and equipment
- Technical specifications
- Model numbers and part references
5. Installation and Commissioning Records
- EICR or Electrical Installation Certificate (EIC)
- Minor Electrical Installation Works Certificate (MEIWC) where applicable
- Fire alarm commissioning certificate (BS 5839)
- Emergency lighting commissioning and test record (BS 5266)
- EV charger commissioning record
6. Operating Instructions
- Step-by-step instructions for operating each system
- Normal operating procedures
- Instructions for isolation and shutdown
7. Maintenance Instructions
- Recommended maintenance schedule for each system
- Routine maintenance tasks and intervals
- Who should carry out maintenance
8. Warranties and Guarantees
- Product warranties for installed equipment
- Workmanship guarantee from the electrical contractor
9. Emergency Procedures
- Emergency isolation procedures
- Contact details for emergency engineers or helplines
10. Contacts and Useful Information
- Electrical contractor contact details
- Key manufacturer and supplier contacts
O&M Manual vs Health and Safety File vs Building User Guide
These three documents are often confused — and sometimes combined — on UK construction projects. Here is a clear breakdown.
| Document | Purpose | Required by |
|---|---|---|
| O&M Manual | How to operate and maintain installed systems | Employer's requirements, contract specification |
| Health and Safety File | Residual risks; information for future construction work | CDM Regulations 2015 (notifiable projects) |
| Building User Guide | Plain-English guide for non-technical occupiers | BREEAM, employer's requirements (often voluntary) |
What Documents Do I Need to Submit?
If you are an electrical contractor, the documents you typically need to provide for your section of the O&M manual are:
The more complete your submission, the faster and cleaner the finished manual will be. If you would rather collect your own documents into a ready-made structure first, you can download our free electrical O&M manual template.
Common Mistakes Contractors Make with O&M Manuals
Leaving it until the end of the project
O&M documents should be collected throughout the project — datasheets when equipment is ordered, certificates as work is tested and commissioned, warranties when equipment is registered.
Submitting unorganised files
A folder of PDFs with filenames like "scan001.pdf" is not an O&M manual. The finished document needs to be structured, indexed, and navigable.
Missing key certificates
The most commonly missing documents are Electrical Installation Certificates, fire alarm commissioning certificates, and emergency lighting records.
Not including as-built information
If the installation changed during the project, drawings and schedules should reflect what was actually installed — not the original design intent.
Using low-quality scans
Certificates and datasheets should be legible. Poor quality scans create problems for anyone referencing the manual later.
Ignoring formatting requirements
Some clients and principal contractors have specific requirements for how O&M manuals should be structured, paginated, or branded.
How Long Does an O&M Manual Take to Produce?
Production time depends on the scope of the installation, the quality and completeness of the source documents, and any specific formatting requirements from the client. A small commercial fit-out might take a day to compile; a large multi-system project could take a week or more if information is incomplete.
Do Subcontractors Need to Provide O&M Manuals?
Yes — in most cases, subcontractors are required to provide their section of the O&M manual as part of their contractual obligations. Your subcontract agreement will typically reference the employer's requirements or a specification clause that sets out what you need to submit. This is usually a condition precedent to final payment.
Even where it is not explicitly stated in your contract, failing to provide O&M documentation can lead to delayed practical completion, retention withheld, and disputes with the principal contractor.
O&M Manuals and British Standards
For electrical contractors, the relevant British Standards and guidance documents that typically feature in or are referenced by O&M manuals include:
Project-OM is a specialist O&M manual production service built specifically for electrical contractors. Upload your documents and we compile, structure, and write your manual around them.
Want to collect your own documents into a ready-made structure first?
Frequently asked questions
What is included in an electrical O&M manual?
A complete electrical O&M manual includes project information, system descriptions, equipment datasheets, test certificates and commissioning records, operating instructions, maintenance schedules, warranties, emergency procedures, and contractor contact details.
What is the difference between an O&M manual and a health and safety file?
An O&M manual covers how to operate and maintain installed systems. A health and safety file covers residual risks left after construction and information for future construction work. They are different documents, though they are often issued together on CDM-notifiable projects under the Construction (Design and Management) Regulations 2015.
Who is responsible for producing O&M manuals on a construction project?
The principal contractor is ultimately responsible for the complete O&M manual. Each subcontractor is responsible for providing the documentation relating to their own scope of works — including electrical contractors for their electrical installation.
What British Standards are relevant to electrical O&M manuals?
Key standards include BS 7671 (IET Wiring Regulations, 18th Edition), BS 5839 (fire detection and alarm systems), BS 5266 (emergency lighting), and BSRIA BG 1/2021 (Soft Landings). CIBSE TM31 is relevant for building log books on larger projects.