Temporary construction facilities: what drawings should show

Why Temporary Facilities Matter

Temporary construction facilities are not permanent building elements, but they enable the entire project. Poor coordination of temp systems causes:

• Schedule delays when power, water, or access aren't available when needed
• Safety hazards from inadequate fencing, lighting, or egress
• Conflicts between cranes, material staging, and building footprints
• Contractor disputes about who provides what and where
• Violations of local codes for temporary utilities and site safety
• Environmental issues from improper temporary drainage or waste management

Key Temporary Facilities Systems

Temporary Power (Electrical)

Construction requires power for tools, equipment, hoists, and temporary lighting. Drawing should show:

• Location of temporary electrical service disconnect and main panel
• Temporary pole or trailer location (if service comes to site)
• Distribution points, where power is routed for subpanels, hoists, or tower crane
• Amperage requirements and connection details to utility
• Safety equipment: GFCI protection, grounding, bonding details
• Duration: which phase it's decommissioned (end of rough-in, end of construction, etc.)

Temporary Water and Sanitary Sewer

Temporary water is needed for dust control, cleaning, and (sometimes) mixing concrete. Sanitary sewer or portable toilets handle worker hygiene. Drawings should show:

• Connection point to existing water supply or temporary tank/hydrant location
• Temporary hose routing and storage (shouldn't block egress)
• Discharge location for rinsing water and runoff control
• Number and location of portable toilets (per code, typically 1 per 10 workers)
• Septic tank pumping schedule and access for service vehicles

Construction Fencing and Security

Temporary fencing protects the public and controls site access. Plans must show:

• Perimeter fence line with height (6–8 ft typical, per code)
• Gates for worker/vehicle access with security controls
• Temporary signage locations (construction notice, permits, safety signs)
• Pedestrian protection (sidewalk sheds, barriers) if site is on active street
• Lighting for evening security and safety

Crane and Heavy Equipment Placement

Tower cranes and mobile cranes require dedicated space and careful coordination. Site plans should include:

• Tower crane location, footprint, and pin point (where mast is anchored)
• Crane load radius and swing path, what areas does the crane hook reach?
• Concrete pad or foundation requirements for crane stability
• Mobile crane position(s) and exclusion zones (no personnel or equipment)
• Conflict check with existing utilities, property lines, and adjacent structures
• Decommissioning plan (climbing down the mast, removal sequencing)

Material Staging and Storage

Materials must be staged where they're accessible but don't block traffic, emergency access, or production areas. Plans should show:

• Designated staging areas for steel, concrete, lumber, MEP equipment
• Temporary trailer locations for site office, tool cribs, wash-up facilities
• Material handling constraints: weight limits on slabs, access to upper floors
• Containment for hazardous materials (fuel, paint, adhesives) with spill control
• Phasing: areas that transition from staging to construction (e.g., parking lot becomes formwork staging)

Construction Entrances and Traffic Control

Worker and vehicle flow must be planned to prevent conflicts. Plans require:

• Primary construction entrance with gate, guard shack, and credential control
• Vehicle access routes to material staging and loading/unloading zones
• Worker entrance separate from vehicle traffic where possible
• Traffic control plan for public street interactions (temporary traffic signals, lane closures)
• Parking for workers and site staff (on or off site)

Temporary Hoist and Lift Locations

Passenger and material hoists need dedicated space and proper foundations:

• Scissor lift, personnel lift, or material hoist location and footprint
• Power connection and safety requirements (guardrails, overload protection)
• Loading zone at bottom and landing areas at upper floors
• Removal plan and timeline (usually removed when permanent hoists are operational)

Temporary Erosion and Stormwater Control

Environmental protection is required by law. Plans must show:

• Sediment control measures: silt fencing, filter berms, catch basin protection
• Temporary swales or drainage channels directing runoff to treatment areas
• Dewatering plan if groundwater is encountered (pump location, discharge location)
• Dust control: street sweeping, water trucks, or dust suppression on roads

What a Temporary Facilities Plan Should Include

Required Elements

• Site boundary with north arrow and scale
• Building footprint and existing structures (for reference)
• Utility lines (above and below grade) with note "Contractor to locate and protect"
• All temporary systems located and labeled with callout numbers
• Details or specs below plan describing temporary system requirements and responsible parties
• Phasing or timeline notes if temp facilities change over construction duration
• Legend explaining symbols (e.g., square = temp panel, triangle = port-a-potty)

Typical Notation

A good temporary facilities plan includes notes like:

• "General Contractor provides temporary power, water, and fencing"
• "Tower crane provided by [Crane Company], location subject to final tie-in design"
• "Material staging at parking lot until Phases 1–2 of construction; relocate to north lot for Phase 3"
• "All temporary facilities removed upon final inspection and site restoration"

Common Problems and Coordination Issues

Missing or Unclear Temp Power Location

If the temporary electrical service location isn't shown, contractors improvise with extension cords and unsafe setups. Require a clear callout and connection details.

Crane Conflicts with Adjacent Buildings

A tower crane's jib can extend 100+ feet. On tight urban sites, the crane hook may swing over property lines. This requires neighbor coordination and sometimes temporary permits.

Material Staging on Active Parking Lots

If the project shares a parking lot with tenants or the public, temp facilities must not interfere. A phased plan prevents conflicts.

Hoist or Crane Foundation Damage

If temporary facilities aren't planned on suitable ground or concrete pads, equipment sinks or shifts during use. Soil bearing capacity and pad design must be specified.

Utility Conflicts

Temp electrical service, water lines, or crane footprints may cross underground utilities. A "Call Before You Dig" service and existing utility plan overlay prevent dangerous conflicts.

Who Is Responsible for What?

General Contractor (GC) Typically Provides:

• Temporary power, water, sanitary facilities
• Site fencing, entrances, traffic control
• Material staging areas
• Waste management and site cleanup

Crane Provider Typically Provides:

• Crane and all lifting equipment
• Concrete foundation and pad design for crane base
• Operator certification and daily safety inspections

Owner or Project Manager May Provide:

• Utility connections (power, water to temporary panels)
• Permits for temporary facilities (fencing, cranes, traffic control)
• Final restoration of site after construction

Always clarify in contracts and on drawings who is responsible for each item. Ambiguity causes disputes and delays.

Safety and Code Requirements

OSHA and Local Code Compliance

Temporary facilities must meet safety codes:

• Fencing: Minimum 6 ft high in most jurisdictions, secured against climbing
• Lighting: Adequate light for evening work and security (minimum foot-candles per code)
• Egress: Clear paths out of the site in emergencies, no blocked gates or exits
• Electrical: Temporary service must be GFCI-protected and properly grounded
• Crane safety: Daily inspections, load testing, operator certification
• Environmental: Stormwater pollution prevention plan (SWPPP) required in most states

Insurance and Permits

Temporary facilities may require separate permits:

• Temporary use permit for fencing and site structures
• Crane license and operation permit (if not covered under general building permit)
• Traffic control and lane closure permits for public streets