In reinforced concrete construction, formworks and scaffolding are critical temporary works that directly affect cost, productivity, safety, and project timeline. Whether you are preparing a bid proposal, detailed cost breakdown, or internal budget study, a proper estimate ensures profitability and prevents cost overruns.
This comprehensive guide will help contractors, civil engineers, estimators, and construction professionals prepare an accurate Formwork and Scaffolding Estimate for Philippine projects.
What is Formwork?
Formwork is a temporary mold used to shape and support freshly placed concrete until it reaches sufficient strength.
It determines the final shape, alignment, and surface finish of structural elements such as:
- Footings
- Columns
- Beams
- Slabs
- Shear walls
- Stairs
- Retaining walls
Common Formwork Materials in the Philippines
- Phenolic plywood (12mm / 18mm)
- Marine plywood
- Timber framing (2×2, 2×3, 2×4 coco lumber)
- Steel pipes and adjustable props
- Modular steel or aluminum systems
- Form ties and clamps
Formwork cost can represent 30% to 60% of total concrete structure cost, making accurate estimation critical.
What is Scaffolding?
Scaffolding is a temporary structure used to provide safe access and working platforms for workers during construction.
It supports:
- Formwork installation
- Rebar installation
- Concrete pouring
- Finishing works
- Elevated construction activities
Common Scaffolding Systems
- H-frame scaffolding
- Tubular scaffolding
- Cuplock system
- Ringlock system
- Mobile scaffold towers
Rental scaffolding is common in Metro Manila and provincial projects due to high capital cost.
Key Factors Affecting Formwork and Scaffolding Cost
Before preparing your estimate, evaluate these important factors:
1. Structural Complexity
- Deep beams increase formwork area
- High column height increases staging requirement
- Irregular shapes increase labor time
2. Building Height
Higher floors require:
- Additional scaffolding height
- Safety rails
- Additional bracing
3. Reusability of Materials
Plywood reuse cycles greatly affect cost:
- Slab formwork: 4–6 reuse cycles
- Column formwork: 6–8 reuse cycles
- Beam soffit: 3–5 reuse cycles
Failure to compute reuse properly results in underestimated material cost.
4. Labor Productivity
Productivity depends on:
- Crew experience
- Project layout
- Weather conditions
- Equipment availability
Typical productivity:
- 8–12 sqm formwork per carpenter per day (average complexity)
5. Safety Requirements
- Guardrails
- Toe boards
- Safety nets
- Access ladders
- PPE compliance
These must be included in your estimate.
Step-by-Step Estimating Procedure
Step 1: Quantity Takeoff
A. Measure Formwork Contact Area (Square Meters)
Columns:
Perimeter × Height
Beams:
(2 sides + soffit) × Length
Slabs:
Underside area only
Walls:
Both faces × height
Always deduct large openings if applicable.
B. Measure Scaffolding Requirement
Scaffolding may be measured by:
- Square meters (working platform area)
- Linear meters (perimeter staging)
- Per set per month (rental basis)
Confirm rental duration before finalizing cost.
Step 2: Material Cost Breakdown
Formwork Materials
Include:
- Plywood (consider reuse factor)
- Timber supports
- Adjustable steel props
- Form ties
- Nails and consumables (3–5% allowance)
- Wastage (5–10%)
Formula example:
Required Area ÷ Reuse Cycle = Actual Plywood Requirement
Scaffolding Materials
If rental:
Rental Rate × Quantity × Duration
If owned:
Include:
- Depreciation
- Maintenance
- Mobilization
- Transportation
Step 3: Labor Cost Computation
Typical crew composition:
- 1 Foreman
- 2–4 Carpenters
- 2 Helpers
Labor Cost Formula:
Total Man-days × Daily Rate
Example:
If total required is 120 man-days
Average labor rate = ₱850/day
Total Labor Cost = ₱102,000
Step 4: Equipment Cost
Include:
- Power saw
- Drills
- Concrete vibrator (if included in scope)
- Hoisting equipment (if needed)
- Generator (if applicable)
Step 5: Add Indirect Costs
Do not forget:
- Supervision cost
- Safety officer
- Mobilization and demobilization
- Temporary facilities
- Contingency (5–10%)
- Overhead and Profit (10–20%)
Sample Formwork Unit Rate Analysis (Illustration Only)
Materials: ₱450/sqm
Labor: ₱300/sqm
Equipment: ₱50/sqm
Subtotal: ₱800/sqm
OHP (15%): ₱120
Estimated Rate: ₱920/sqm
Note: Rates vary depending on project location, scope, and market condition.
Common Estimating Mistakes to Avoid
- Not considering plywood reuse cycles
- Ignoring stripping schedule
- Underestimating labor productivity
- Not including safety components
- No allowance for damaged materials
- Forgetting scaffolding dismantling cost
Accurate temporary works costing separates professional estimators from guess-based pricing.
Rental vs Ownership: Which is Better?
Rent When:
- Short-duration project
- High-rise project
- Limited capital
- One-time job
Own When:
- Repetitive housing projects
- Long-term contractor operation
- Large volume ongoing work
Make decision based on cost-benefit analysis.
Final Thoughts
Formworks and scaffolding estimation is not just about multiplying area by unit cost. It requires:
- Careful quantity takeoff
- Proper reuse analysis
- Realistic labor productivity
- Safety compliance consideration
- Accurate indirect cost allocation
When done correctly, it protects your profit margin and ensures competitive bidding.