A site manager (also called a site agent or, at senior level, a contracts manager) is employed by the main contractor and is responsible for the day-to-day management of a construction site. Unlike a construction project manager who works for the client, a site manager works for the contractor and manages the physical delivery of the works. Their responsibilities cover supervising on-site trades and subcontractors, maintaining health and safety standards, driving the construction programme, managing deliveries and plant, and liaising with the client's design team. On smaller domestic projects the site manager role is often filled by the builder or main contractor directly. On larger projects it is a dedicated management role. The Chartered Institute of Building (CIOB) provides the principal professional qualification route - MCIOB.
What they do
- Day-to-day supervision of all on-site trades and subcontractors
- Drive and maintain the construction programme
- Manage site health and safety - inductions, method statements, risk assessments
- Coordinate deliveries, plant and site logistics
- Quality control of workmanship as work progresses
- Attend site meetings and liaise with the architect and design team
- Manage site welfare facilities and CDM compliance
- Snagging and defect management leading up to practical completion
When you need one
A site manager is employed by the main contractor - understanding their role helps clients know who is responsible for what on site and when to escalate concerns to the design team rather than the site manager.
Typical earnings / costs (UK, 2025)
| Role / arrangement | Typical cost / salary |
|---|---|
| Junior site manager (employed) | £35,000 - £45,000 / year |
| Experienced site manager (employed) | £45,000 - £65,000 / year |
| Senior site manager / contracts manager | £60,000 - £85,000+ / year |
| Freelance site manager (day rate) | £350 - £600 / day |
| Self-build project management service | £400 - £700 / day |
For self-builders appointing a freelance site manager, always define the scope clearly: which trades they manage, how many days per week on site, reporting requirements and what authority they have to instruct subcontractors.
Qualifications to look for
The principal professional qualification for site managers in the UK. MCIOB requires a qualifying management qualification and a professional assessment. It signals management competence and commitment to professional standards. Verify at ciob.org.
CITB-accredited 5-day course covering health and safety management for site managers. SMSTS certification is widely required by contractors and clients for any supervisory site role. Valid for 5 years with a refresher course required to renew.
A Construction Skills Certification Scheme Gold Card confirms the holder has a relevant management qualification and has passed the CITB Health, Safety and Environment test. Most contractors require a CSCS card as a minimum for site access in any supervisory role.
How to find a site manager
Frequently asked questions
Who does a site manager work for?
A site manager is employed by the main contractor, not the client. They manage the day-to-day construction operations on behalf of the contractor - supervising trades, coordinating subcontractors and managing health and safety on site. The client's interests are represented by the architect (as contract administrator) and, on larger projects, a construction project manager or clerk of works appointed directly by the client. This distinction matters: a site manager's primary duty is to the contractor.
What qualifications does a site manager need in the UK?
A site manager in the UK typically holds: a CSCS Gold or Black card (demonstrating construction skills and health and safety knowledge); Site Management Safety Training Scheme (SMSTS) certificate; a relevant construction qualification at Level 4 or above; and ideally MCIOB membership or be working towards it. MCIOB (Member of the Chartered Institute of Building) is the professional benchmark for site managers and requires demonstrated management competence as well as a qualifying qualification. Many site managers also hold First Aid at Work certification.
What is the difference between a site manager and a contracts manager?
A site manager is physically present on site, managing day-to-day operations for one project. A contracts manager typically oversees multiple projects simultaneously, managing site managers and dealing with contractual and commercial matters across a portfolio. Contracts managers are more senior, spend less time on site and focus more on programme, cost and client relationships. On larger projects there may be both a contracts manager and a site manager; on smaller projects one person may fulfil both functions.