Site Manager Interview Questions

Health and safety is not a separate function from running the site: it is baked into every daily decision. My starting point is the Construction Phase Plan, which I review and update whenever the scope, sequence, or workforce changes materially. Every morning I run a toolbox talk with the trades on site, covering the day's activities and any specific hazards: working at height, plant movements, hot works, or excavations near existing services. I do a site inspection every morning before work starts and a closing inspection every afternoon, and I log both in the site diary. I operate a zero-tolerance policy on four things: no helmet, no high-vis, no harness at height, and unsafe plant operation. First offence gets a verbal warning logged. Second offence means the operative leaves the site that day, no exceptions. On CDM, I work closely with the principal designer and client to make sure the pre-construction information is complete before mobilisation, and I maintain the health and safety file throughout the build.

I build the programme in two stages. First, a high-level milestone plan agreed with the client and project manager, showing the key phases and the critical path. Second, a detailed four-week rolling programme that I update every Friday and circulate to all subcontractors by Monday morning. The rolling programme is where actual coordination happens: it shows exactly which trades are on site each day, what preceding activities need to be complete before they can start, and where the float is. I identify the critical path early and protect it aggressively: if groundworks or structural steel is on the critical path, I make sure those activities have adequate resource and that I am chasing the lead times on materials eight to ten weeks in advance. When a delay hits, I first quantify the impact on the critical path before deciding on mitigation. Accelerating non-critical activities wastes money and causes congestion on site.

Good subcontractor management starts before they arrive on site. I review their method statements and risk assessments before they mobilise, and I will not allow them on site until those documents are approved and their operatives have been inducted. On site, I make a point of having a brief conversation with each subcontractor supervisor at the start of every day, not to micromanage but to pick up on any resource, access, or interface issues early. I hold a weekly subcontractor coordination meeting, which is the main forum for programme updates, interface sequencing, and any change or variation discussions. I also use daily record sheets to log the workforce numbers and plant on site for each subcontractor: this is essential if a delay claim arises later, because you need contemporaneous evidence of resource levels. I address performance issues directly and promptly. A subcontractor who is two weeks behind on their package and not recovering puts every other trade at risk.

Quality control has three stages. First, during procurement: I review the specification and make sure the subcontract documents capture the quality standards clearly, including any relevant British Standards or Approved Documents. Second, during the works: I do not wait until a package is complete to inspect it. I use stage inspections at key hold points, for example before concrete pours, before plasterboard is boarded over service installations, and before finishes are applied. I maintain an inspection and test plan for each package and sign it off progressively. Third, snagging: I run a rolling snag list throughout the project, not a single end-of-project exercise. Snagging at the end, with a contractor who is demobilising and has moved their best operatives to the next job, produces poor results. My target on handover is a defects list of under 20 items for a typical residential unit, which is achievable if the stage inspections have been done properly.

During a groundworks package on a commercial project, an operative suffered a crush injury to his hand when a trench support failed partially. My immediate actions were: call an ambulance, make sure the injured operative was not moved unnecessarily, isolate the area, and ensure the remaining operatives moved away from the trench. I then called my contracts manager and the principal contractor's site manager. Once the operative was receiving treatment and the site was secured, I preserved the scene and began gathering contemporaneous evidence: photographs, witness statements from two operatives who were present, and the plant operator's record sheet for that morning. I completed a RIDDOR report within the required ten-day period and cooperated fully with the HSE investigation. The investigation found that the trench support equipment had not been inspected that morning as required by the method statement: a process failure, not a mechanical one. I introduced a signed daily inspection checklist for all excavation support equipment as a result, which has been in place on every project since.

On a 24-unit residential scheme, our structural steel supplier went into administration seven weeks before the frame was due to start. The frame was on the critical path, so a seven-week slip would have pushed the handover past the contractual completion date and triggered liquidated damages. I spent two days contacting alternative steel fabricators, three of whom could mobilise within the timeframe but at a cost premium. In parallel, I worked with the project manager to identify which steel elements we could pre-order from stock and which required fabrication drawings. By splitting the order between two suppliers and resequencing the erection programme to start with the stock elements while the fabricated sections were being produced, we recovered four of the seven weeks. The remaining three-week delay was recovered by running critical path activities in parallel during the structure and external envelope phase, which required additional coordination but was achievable. We hit the contractual completion date.

On a refurbishment project, the architect issued an instruction to alter the position of a partition wall that would have affected a structural beam, without consulting the structural engineer. I flagged the issue immediately: the instruction as issued could not be implemented safely without a structural engineer's sign-off. The architect pushed back, suggesting the beam was not structural because it did not appear on the latest drawing issue. I retrieved the original structural drawings and the building control submissions and confirmed the beam was load-bearing. I requested an urgent review with the structural engineer, who confirmed that the beam could not be disturbed without temporary propping and a redesign of the bearing. This added ten days and approximately £4,000 to the programme. I documented the full sequence of events in a contract administration letter and notified the client of the variation cost. The client acknowledged the issue and instructed the variation. The lesson was that the site manager is often the last line of defence on technical compliance: knowing when to stop work and escalate is as important as knowing how to build.

Under CDM 2015, the key dutyholders are the client, the principal designer, and the principal contractor, but the site manager has specific operational responsibilities that sit within the principal contractor's duties. My core obligations are to ensure the construction phase plan is in place before work starts and that it is kept up to date, to manage the site so that it is maintained in a safe condition, to coordinate activities to manage the risks from the interaction of different trades, and to ensure all workers receive a site induction before starting and have access to the information they need to work safely. I also contribute to the health and safety file that the principal designer maintains, providing as-built information and records of any changes to the design or method that are relevant to future maintenance or demolition. On notifiable projects, I make sure the F10 notification is submitted before the construction phase begins. The site manager is operationally responsible for what happens on the site every day: CDM compliance is not a paperwork exercise, it is an operational practice.

Constrained sites require a logistics plan that is almost as detailed as the construction programme itself. My starting point is the site setup drawing, showing the locations of the welfare facilities, material storage, plant access routes, and the loading bay or off-street delivery area. On a tight urban site, I typically implement a booking system for deliveries: no lorries arrive on site without a pre-booked slot, which prevents queuing on the public highway and the time-wasting that comes with unplanned deliveries. I also sequence material deliveries to match the programme, so that materials arrive just in time rather than being stored on a site with no space to store them. I manage the interface between plant movements and pedestrian routes rigorously, using banksmen whenever a vehicle is reversing near pedestrian zones. I hold a site logistics briefing whenever a new phase of work starts that changes the traffic and pedestrian flow through the site.

Handover preparation starts six to eight weeks before the planned completion date, not in the last week. I work through the handover checklist with the client's representative and building control at least six weeks out to identify any outstanding inspections, approvals, or certificate requirements. I compile the operations and maintenance manuals, as-built drawings, warranties, and test certificates progressively during the build, rather than rushing to collate them at the end. On the physical condition of the works, I run my own internal inspection sweep four weeks before handover, produce a snagging list, and instruct each subcontractor to complete their items within two weeks. That gives me a two-week buffer to reinspect and confirm completion before the client's representative does their own walk-through. A clean handover, with a short defects list and complete documentation, sets up a good defects liability period because the client has confidence in the quality of the work and is less likely to report minor issues as defects.