Office Electrical Fit-out Vietnam: 2025 BOQ & Cost Guide

Are you feeling the immense pressure of an impending Grand Opening? Are you worried that your new office’s electrical system will be a mess of tangled wires, aesthetically unpleasing, or that the network will crash as soon as your staff headcount increases?

With over 20 years of experience providing M&E consultancy and construction services, I have witnessed countless Grade A office projects that were visually stunning in terms of interior design but were absolute “technical nightmares.” Outlets placed in the wrong spots, constant network dropouts, or costs ballooning by 30% due to vague initial estimates.

To ensure your building electrical & M&E installation meets aesthetic standards and is completed at “lightning speed,” the secret lies in precise technical solutions and a transparent Bill of Quantities (BOQ). In this article, KTH Electric will share the process for installing raised floor electrical systems (Floor boxes), LAN infrastructure, and provide a sample BOQ for a 150m² office space.

If gypsum ceilings hide the HVAC system, then the raised access floor is the “sky” for the office electrical system. Installing electricity under a raised floor is an “art” requiring absolute precision.

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The 4-Step Precision Installation Process

Includes 4 steps: (1) Positioning & Overlaying Drawings -> (2) Installing Trunking/Conduit -> (3) Wiring & Labeling -> (4) Installing Floor Boxes & Safety Grounding.

To ensure the system operates smoothly, we apply a strict protocol:

• Step 1: Positioning (Marking) & Drawing Overlay
  Before the floor tiles are installed, engineers must perform a Drawing Overlay: Superimposing the M&E electrical drawing over the Furniture Layout. The goal is to ensure the electrical outlet (Floor box) sits perfectly under the desk clearance, avoiding being crushed by table legs or creating hazards.
• Step 2: Routing Trunking and Conduit
  The wiring system needs protection from pests and compression forces.
  • Use Electrical Metallic Tubing (EMT) for branch lines.
  • Use a wire mesh cable tray system for the main trunk to allow better heat dissipation.

  Note: Adhere to cable tray installation guidelines, ensuring standard support clamp spacing of 1.5m, to prevent the system from shifting during floor installation.

• Step 3: Wiring & Labeling
  Use high-quality electrical cables (typically CV 2.5mm² – 4.0mm²). Golden Rule: Label both ends of the wire immediately to facilitate future electrical system maintenance.
• Step 4: Installing Floor Box & Safety Connections
  Use Pop-up or heavy-duty sliding cover Floor Boxes.⚠️ Warning: Never leave wire joints exposed under the raised floor. You must use IP-rated waterproof junction boxes and follow grounding installation procedures to ensure safety against leakage, as office floors are frequently cleaned with water.

The network system is the “backbone” of the office. Many contractors mistakenly run network cables in the same tray as power lines to cut costs, causing signal interference. You need to understand what ELV is to grasp its importance.

Mandatory Technical Standards

• Network Cable: Minimum Cat6 or Cat6A (CommScope/Legrand).
• Anti-interference: Network cables must be at least 30cm away from power lines.
• Rack Management: Use Patch Panels; do not crimp connectors manually and plug directly into the Switch.

If you need detailed costs for this item, please review our ELV installation quotation article.

To meet deadlines in Grade A buildings (which typically restrict noisy work to nights), KTH Electric applies the following strategy:

• ☀️ Daytime (Silent Work): Pulling wires, connecting electrical cabinets, installing devices.
• 🌙 Nighttime (Noisy Work): Drilling, cutting, transporting materials.
• 📂 Documentation: Prepare as-built electrical & plumbing drawings and night work permits in advance to avoid interruptions.

Below is a PROVISIONAL estimate for a 150m² office (30 employees) based on Class B+ office standards.

PART 1: POWER SYSTEM & FLOOR BOXES

The main power supply category, using high-safety materials.

PART 2: LAN SYSTEM & DATA CENTER

PART 3 & 4: ROUGH-IN MATERIALS & LABOR

💡 Expert Insight: The average unit price is around 600,000 VNĐ/m². During construction, careful selection of circuit breakers like MCBs matched to the load is crucial to prevent overload. For larger offices, consider installing Low Voltage Capacitor Banks to optimize power factor and avoid utility penalties.

Every office has a different Layout. To avoid a situation where “the estimate is one thing, and reality is another,” you need a custom BOQ.

Furthermore, upon completion, Electrical Fire Safety Inspection (PCCC) and signal testing are mandatory for the building management to authorize your operations.

🎁 SPECIAL OFFER FROM KTH ELECTRIC

Contact us for a survey this week to receive a support package worth 5,000,000 VNĐ:

• ✅ Free Shop Drawing Design: Overlay of interior and electrical plans.
• ✅ Signal Measurement: Comprehensive Fluke Test Report.