Case 01 / New Build

New large electronics retail store (Tokyo)大型家電量販店の新築（東京都）

A electronics retail store with approx. 6,400 m² of sales floor over 5 floors, in a redevelopment building by a station. We handled the electrical work, from the main feeders to sales-floor lighting, low-voltage systems and the PA system. Since it opened, the same store has kept asking us for electrical repairs and added circuits.

Sales floor area: approx. 6,400 m²
Floors: 5 floors
Construction start: 2016.03
Opening: 2016.11

Cables and hanger bolts installed above the ceiling of a new store — Wiring above the 6th-floor ceiling, photographed before the ceiling was closed.

Outline

Project overview工事概要

Category: Store
Location: Tokyo
Building use: Large electronics retail store (3rd to 7th floors of a station-front redevelopment building)
Scale: Sales floor approx. 6,400 m², 5 floors
Type of work: New construction (building services for the tenant space)
Our scope: Electrical systems. Mechanical systems such as air conditioning, ventilation and plumbing were handled by our group company SOWA SERVICE Co., Ltd.
Period: March to December 2016 (opened November 2016). From 2018 to 2025, also electrical repairs, added circuits and sales-floor renovations for the same store.
Related services: Main feeders & power, Lighting & outlets, Low-voltage & communications

Electrical Scope

Scope of electrical work電気工事の範囲

On each of floors 3 to 7, we carried out the following work, from the power source to the ends of the circuits on the sales floor.

01Main feedersMain feeders to each floor and their circuits

02Power & A/C supplyPower equipment on each floor and supply to the air-conditioning units

03Distribution boardsInstalling and connecting the distribution boards on each floor

04Sales-floor lighting & lighting trackSales-floor lighting, the lighting track it mounts on, lighting around the escalators, and power for sign lighting

05DimmingDimming equipment for the sales-floor lighting

06OutletsCeiling-fed outlets on the sales floor, and power for fixtures and display TVs

07Low-voltageTV, LAN and POS, telephone conduit, security cameras, intercoms

08PA systemSales-floor PA, designed to switch to emergency broadcast in an emergency

Process

How the work went工事の流れ

From the start of construction to opening, and maintenance after opening. Compiled from our construction records.

2016.03Construction starts
We began the electrical work based on the design drawings for the tenant space.
2016.04–05Wiring each floor and installing distribution boards
On floors 3 to 7, we marked out the layout and prepared for wiring, then ran the wiring for main feeders, lighting and outlets, and low-voltage systems. We also installed the distribution boards on each floor. Wiring above the ceilings was photographed before the ceilings were closed.
2016.11Finishing before opening; opening
Before opening, we added crew with support from the group and our partner contractors to finish the electrical work. Additional work, including changes to the management office, a café area and power for exterior signs, went ahead at the same time, and the store opened in November.
2016.12Work completed
The electrical work was finished by December.
2018–2025Repairs and added circuits after opening
From 2018 to 2025, the same store asked us for electrical repairs, added circuits and sales-floor renovations. We respond as the floor changes or equipment develops faults.

Story

Challenge and response課題と対応

In an electronics store, the sales floor itself is full of electrical equipment.

Issue

Across five sales floors, a great deal of electrical equipment, from lighting and outlets and power for display TVs to POS/LAN and security camera wiring, had to be in place by opening day.

Action

From April to May, we ran the wiring for main feeders, lighting and outlets, and low-voltage systems on each floor and installed the distribution boards. In November, before opening, we added crew to finish the work.

Result

The electrical systems on all five floors were in place in time for opening. After opening, from 2018 to 2025, the same store continued to ask us for electrical repairs, added circuits and sales-floor renovations.

Group

Working as a groupグループでの体制

Two group companies split the mechanical and electrical work.

SOWA SERVICE Co., Ltd.

Air conditioning (indoor and outdoor units, refrigerant piping, drain piping)
Humidification, ventilation & ductwork
Plumbing
Kitchen hood fire suppression

KD WORK Co., Ltd. (us)

Main feeders & power, A/C unit power supply
Distribution boards
Sales-floor lighting, lighting track, dimming, outlets
Low-voltage systems, PA system

Approach

How we work当社の進め方

In an electronics store, the electrical layout is closely tied to where the fixtures stand. In this store, the sales-floor outlets were fed from the ceiling, with power provided to match the positions of the fixtures and display TVs.

Power for the air-conditioning units falls within the electrical scope. Because our group company SOWA SERVICE installed the air conditioning, equipment positions and schedules could be coordinated within the same group.

Even after opening, a sales floor keeps changing. We take on electrical refurbishment and repairs as the floor changes or equipment develops faults.

Client and building names are not published. The only figures shown are sales floor area (an approximate figure from public information), number of floors and dates.