Standardize the Scope of Work First

Receiving quotes with vastly different totals usually means contractors assumed different tasks. A lower bid might exclude demolition, site cleanup, or waste disposal. A higher bid might cover total haul-out and night shifts.

Always issue a detailed Bill of Quantities or uniform scope of work to every contractor. Require them to fill out your template line by line rather than submitting custom proposal formats.

  • Include exact floor areas and ceiling heights.
  • List explicit exclusions like hauling and temporary power.
  • Separate supply costs from installation labor.

Compare Material Specifications Line by Line

Contractors often substitute materials to lower their price. A proposal listing generic PVC pipes or unlabeled electrical wires costs less than one specifying PPR pipes or Phelps Dodge copper wiring.

Check technical data sheets for paint, waterproofing, and structural items. In tropical climates, lower-tier waterproofing membranes fail quickly during typhoon season.

  • Verify pipe materials and pressure ratings.
  • Confirm electrical wire gauge and insulation ratings.
  • Check paint brands and the number of coats specified.

Account for Permits and Administrative Fees

Commercial projects in BGC, Makati, or PEZA zones face strict building admin rules. Work permits, hot work permits, and security vetting require extra administrative time and fees.

Ensure the contractor states who pays for LGU building permits, occupancy certificates, and local fire safety inspections. Bids that omit official fees appear cheaper initially but cause cost overruns later.

  • Clarify who processes LGU architectural and electrical permits.
  • Identify who pays construction bonds and gate pass fees.
  • Confirm compliance with building safety rules.

Review Schedule and Work Hour Restrictions

Commercial office buildings usually restrict noisy work to night shifts or weekends. Night differential pay increases labor costs significantly.

A contractor offering a fast timeline might plan double shifts. A slower bid might reflect single-shift work to stay under budget. Verify if delivery schedules fit your building admin rules.

  • Check if night work and weekend labor are included.
  • Verify timeline buffer for typhoon delays during rainy months.
  • Confirm loading dock clearance and elevator booking fees.

Examine Payment Terms and Warranties

Compare down payment requirements and milestone schedules. A proposal demanding a sixty percent down payment carries higher risk than one tied to completed progress billing.

Review warranty periods for both labor and materials. A legitimate contractor offers at least one year of warranty on workmanship and passes on manufacturer guarantees for equipment like air conditioners.

  • Avoid full upfront payments before work starts.
  • Hold ten percent retention payable after project turnover.
  • Ensure clear written warranties for scope covered.

Quick answers

Why do contractor quotes vary so widely in price?

Quotes vary due to differences in material brands, included scope like site cleanup, labor rates for night work, and whether LGU permit costs are included.

What is a retention fee in Philippine construction?

Retention is typically five to ten percent of the total project cost held by the client for three to six months to ensure latent defects are repaired.

Should I choose the lowest bidder for office fit-outs?

Not necessarily. The lowest bidder may use lower-tier materials, omit permit processing, or add change orders later during construction.