An Integrated Management System (IMS) combines the requirements of two or more ISO management system standards into a single, unified framework — one system, one internal audit programme, one management review, one certification audit. For UK businesses in construction, manufacturing and facilities management that need ISO 9001, ISO 14001 and ISO 45001 simultaneously, an integrated certification is almost always the most cost-effective and operationally efficient approach.
What is an Integrated Management System?
An IMS merges the shared elements of multiple ISO standards — document control, risk management, objectives and targets, internal audit, management review and continual improvement — into one cohesive system. Integration is possible because ISO 9001, ISO 14001, ISO 45001, ISO 27001 and ISO 50001 all share the same High Level Structure (Annex SL).
What does integration save?
- Audit cost savings — an integrated QHSE audit typically costs 25–35% less than three standalone certifications
- Implementation time savings — build shared infrastructure once
- Ongoing management savings — one internal audit programme, one management review, one document control system
Most common IMS combinations for UK businesses
| Combination | Most common in |
|---|---|
| ISO 9001 + ISO 14001 | Manufacturing, professional services, NHS supply |
| ISO 9001 + ISO 45001 | Construction, engineering, facilities management |
| ISO 9001 + ISO 14001 + ISO 45001 (QHSE) | Construction, manufacturing, utilities |
| ISO 9001 + ISO 27001 | IT services, SaaS, professional services |
| ISO 9001 + 14001 + 45001 + 27001 | Large enterprises, defence supply chain |
How much does integrated certification cost?
| Combination | Typical annual saving vs standalone |
|---|---|
| ISO 9001 + ISO 14001 | 20–25% |
| ISO 9001 + ISO 45001 | 20–25% |
| ISO 9001 + ISO 14001 + ISO 45001 | 25–35% |
