ENVALITH
大豊建設株式会社 logo

DAIHO CORPORATION

1822Standard MarketConstruction

大豊建設株式会社 logo
DAIHO CORPORATION1822

Civil Engineering Business

Taiyu Kensetsu's core segment, built on strength in shield tunneling and pneumatic caisson methods.

PeriodCurrentPreviousChange
Net sales (full year)¥70,314 million¥70,794 million
Operating income (full year)¥3,161 million¥3,647 million
Segment assets¥96,674 million¥88,348 million
Depreciation (full year)¥410 million¥569 million
Orders received (full year, non-consolidated)¥51,852 million¥43,222 million
Order backlog (non-consolidated)¥129,434 million¥130,659 million
Operating margin4.5%5.2%

Business Details

This segment covers the full range of civil engineering works undertaken by Taiyu Kensetsu Co., Ltd. and its subsidiary Morimoto-Gumi Co., Ltd., either as contractor or in a cooperative construction role. The core business centers on public infrastructure development such as sewerage, rivers, roads, and tunnels, with domestic public-sector orders accounting for the majority of sales. The segment also has a construction track record overseas (East Asia and elsewhere). The company holds a competitive advantage in shield tunneling and pneumatic caisson methods, and its medium-term management plan calls for concentrating management resources on core competency areas and advancing R&D in sewerage renewal technologies.

Recent Overview

Orders received recovered, up 20.0% year-on-year, but net sales and operating income declined slightly.

In the civil engineering business for FY2026 (ending March 2026), consolidated net sales declined 0.7% year-on-year to ¥70,314 million, and operating income fell 13.3% to ¥3,161 million, reflecting lower revenue and profit. On the other hand, non-consolidated orders received recovered sharply, up 20.0% year-on-year to ¥51,852 million, with public-sector orders accounting for 53.9% of the total. The order backlog remained at a high level of ¥129,434 million. For FY2027 (ending March 2027), non-consolidated completed construction revenue is forecast to increase 6.9% year-on-year to ¥110,000 million. The medium-term management plan calls for concentrating management resources on core competency areas such as pneumatic caisson and shield tunneling methods, and advancing R&D in sewerage renewal technology.

Key Products

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Underground structure construction using shield tunneling method

Underground structure construction utilizing shield tunneling, Taiyu Kensetsu's core technology. The segment maintains a stable order base backed by demand for stormwater countermeasures and sewerage development in urban areas.

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Foundation and structure construction using pneumatic caisson method

The pneumatic caisson method is one of Taiyu Kensetsu's distinctive areas of expertise. It is applied to bridge foundations and river structures, and is positioned as a focus area for resource concentration under the medium-term management plan.

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Maintenance and repair business

Maintenance and repair works including seismic reinforcement of river levees and highway deck slab replacement. Contributes to diversification of the order base amid demand for renewal of aging infrastructure.

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Sewerage renewal technology

A strategic business area explicitly named for R&D advancement in the medium-term management plan. Aims to enter the sewerage renewal market by leveraging existing civil engineering technologies.

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Overseas civil engineering works

Overseas sales in the consolidated civil engineering business totaled ¥10,628 million in FY2026 (ending March 2026). While the domestic business remains the core, the company maintains a certain level of overseas construction track record.

Growth Drivers

  • Resilient trend in public investment backed by the government's national resilience measures and disaster prevention/mitigation investment
  • Increased order opportunities for shield tunneling and pneumatic caisson methods driven by growing demand for stormwater countermeasures and sewerage development in urban areas
  • Accumulation of future sales from a 20.0% year-on-year increase in non-consolidated orders received (¥51,852 million)
  • Development of new markets through R&D advancement in sewerage renewal technology
  • Strengthened competitive advantage and improved profitability through concentration of management resources on core competency areas
  • Diversification of the order base through strengthening of the maintenance and repair business (seismic reinforcement of river levees, highway deck slab replacement, etc.)

Risks

  • Risk of rising construction costs due to further increases in construction material and labor costs (operating margin declined from 5.2% in the prior period to 4.5% in the current period)
  • Risk of constraints on construction capacity and project delays due to shortage of construction workers
  • Risk of timing shifts in sales recognition due to delays in progress on large-scale projects
  • Slight decline in order backlog, down 0.9% year-on-year (¥129,434 million), with implications for medium- to long-term sales accumulation
  • Risk of additional provisions for construction contract losses due to uncertainty in estimating total construction costs
  • Risk of fluctuation in overseas civil engineering sales (overseas sales of ¥10,628 million in the current period)

Last updated: June 23, 2026