株式会社一条工務店

What 株式会社一条工務店 does

株式会社一条工務店 (ICHIJO Co., Ltd.) is a privately held Japanese residential homebuilder headquartered in Koto-ku, Tokyo, that designs, manufactures, and constructs custom-built wooden houses for individual home buyers across all life stages, from first-time buyers in their 20s to retirees planning second-life homes. The company operates through a nationwide network of owned exhibition halls (with an online virtual showroom, JOE'S TOWN), supporting direct sales consultation, catalog distribution, and on-site experience events (structural tours, completed-home tours, overnight stays).

The company's core technology platform is a proprietary high-performance wooden structural system built on a double-layer exterior/interior insulation construction method (外内ダブル断熱構法), a twin monocoque structure (ツインモノコック構造), and in-house manufactured prefabricated panels. All homes ship as standard with ultra-high airtightness and insulation, whole-house floor heating, the proprietary Lossgard 90 heat-exchange ventilation system, the whole-house Sarapoka air-conditioning system, roof-integrated solar panels with long-life battery storage, double-grade-3 seismic resistance with optional 2×耐震 (2× earthquake resistance), and grade-6/7 insulation grading. The i-smart model achieves a UA value of 0.25 W/m²·K (exceeding Hokkaido-grade requirements as standard), and in 2026 the company standardized insulation grade 6 nationwide with grade 7 also standardized.

Ichijo generates revenue primarily through one-time construction contracts across 11 product lines (Grand Smart, Grand Saison, i-smart, i-cube, Naturia, Saison, Saison A, Brillart, Hyakunen, Hiraya, and 3-story designs), with ancillary monetization through land sales, completed (built-for-sale) homes, and its own i-flat mortgage product. Pricing is quote-based and varies by product line, customization, and land cost; no public price list is disclosed. The company holds the Guinness World Record for most-sold custom home company in Japan for five consecutive years (target year 2023), has achieved 100% ZEH compliance across all regions in 2024, and surpassed 110,000 cumulative ZEH/super-ZEH deliveries by March 2025. Its customer base is concentrated in individual B2C households with no enterprise or named-logo anchors.

Name

株式会社一条工務店

Legal name

ICHIJO Co., Ltd.

Website

https://ichijo.co.jp

Company type

Private

Operating status

Operating

Headcount range

11–50 employees

Short description

株式会社一条工務店 (ICHIJO Co., Ltd.) is a privately held Japanese homebuilder that designs, manufactures, and constructs high-performance custom wooden houses across 11 product lines for individual home buyers in Japan, distributed through a nationwide network of exhibition halls and direct sales consultation.

Ownership category

akta.pro rank

Product category

Custom-Built Residential Home Construction

NAICS

New Single-Family Housing Construction (except For-Sale Builders) (236115), Prefabricated Wood Building Manufacturing (321992)

akta.pro primary industry

Custom Home Building (IMAFABAC)

akta.pro secondary industries

Residential Green / High-Performance Home Construction (Net-Zero, Passive House) (IMAFABAH), Residential Luxury / High-End Home Construction (IMAFABAJ), Residential Design-Build & Renovation-Integrated Builders (IMAFABAE)

Keywords

• Custom home construction
• Energy-efficient housing
• Prefabricated wooden houses
• Residential home builder
• High-performance insulation

Headquarters

HQ city

江東区, 東京都

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Technology or R&D

Revenue model

1. Custom Home Construction & Sales: 一条重工店's primary revenue is generated through the construction and sale of custom-built wooden houses. The company offers 10 distinct product lines (グラン・スマート, グラン・セゾン, アイ・スマート, アイ・キューブ, ナチュリア, セゾン, セゾンA, ブリアール, 百年, 平屋) at various price points and performance tiers, allowing buyers to customize floor plans, interiors, and specifications. Revenue is realized upon completion and handover of the home to the buyer. The company also offers ancillary services including mortgage financing (一条の住宅ローン 'i-flat'), land sales, and completed home (建売) sales.

Pricing tiers

Go-to-market motion1 record

Distribution channels5 records

Marketing channels11 records

Core offering

株式会社一条工務店 designs, manufactures, and constructs custom-built high-performance wooden detached houses for individual Japanese homebuyers. The company sells 11 distinct product lines ranging from ultra-energy-saving homes (i-smart, i-cube, Grand Smart) to European-style designs (Saison, Brillart) and traditional Japanese aesthetics (Hyakunen), all featuring industry-leading insulation, integrated solar power with battery storage, whole-house floor heating, and seismic/flood resistance as standard specifications. Revenue is generated primarily through one-time home construction contracts, supplemented by land sales, completed home (建売) sales, and the company's own branded mortgage product (i-flat).

Product overview

一条重工店 is a custom-built wooden house manufacturer offering 11 distinct product lines including グラン・スマート, グラン・セゾン, アイ・スマート, アイ・キューブ, ナチュリア, セゾン, セゾンA, ブリアール, 百年, 平屋, and 3階建て. The products range from ultra-high-performance energy-saving homes (i-smart, i-cube, Grand Smart) to European-style designs (Saison series, Brillart) and traditional Japanese aesthetics (Hyakunen). All homes feature proprietary technologies including whole-house floor heating, whole-house air conditioning (さらぽか), earthquake resistance systems, water damage resistance, and solar power generation as standard or optional features. The company standardizes high insulation performance (insulation grade 6/7) and earthquake resistance (grade 3) across all models.

Differentiator

Problem solved

Functional benefit

Brands

• グラン・スマート (Grand Smart): High-end residential product with sophisticated design and top-class energy performance
• グラン・セゾン (Grand Saison)
• アイ・スマート (i-smart)
• アイ・キューブ (i-cube)
• ナチュリア (Naturia)
• セゾン (Saison)
• セゾンA (Saison A)
• ブリアール (Brillart)
• 百年 (Hyakunen)
• 平屋 (Hiraya)
• 3階建て (3-story)

Products and services

• Grand Smart (グラン・スマート) Refined, premium-quality custom wooden home combining sophisticated design with industry-leading health, comfort, and energy-efficiency performance. Targeted at Japanese homebuyers seeking a top-tier residence.
• Grand Saison (グラン・セゾン) Premium lifestyle residence with elegant European-style design, dignified appearance, and high-quality material usage. Targeted at Japanese homebuyers seeking a sophisticated European aesthetic.
• i-smart (アイ・スマート) Ultra-energy-saving and ultra-healthy custom home with the industry's highest performance, balancing design and functionality from exterior to interior equipment. UA value of 0.25 W/m²·K as standard, exceeding Hokkaido insulation requirements.
• i-cube (アイ・キューブ) Cube-style modern home with bright, white-based interior design offering top-class energy efficiency at a controlled cost. Targeted at Japanese homebuyers seeking modern design with high efficiency.
• Naturia (ナチュリア) Nordic-focused custom home addressing 'comfort and coziness' through 4 Nordic styles supervised by Yukiko Mori. Targeted at Japanese homebuyers interested in Scandinavian design and lifestyle.
• Saison (セゾン) European-style custom home with authentic materials and quality focus, featuring abundant natural wood interiors and brick tile exterior. Targeted at Japanese homebuyers seeking authentic European aesthetics.
• Saison A (セゾンA) Casual European design custom home with natural-textured materials coordinated to create modern spaces. Targeted at Japanese homebuyers seeking approachable European-style design.
• Brillart (ブリアール) Provence-style custom home featuring attractive old terracotta roof tiles and arch wall decorations with a southern France ambiance. Targeted at Japanese homebuyers seeking southern European aesthetics.
• Hyakunen (百年) Custom home fusing traditional Japanese design with advanced technology to create a dignified appearance with high functionality; designed to age gracefully over time. Targeted at Japanese homebuyers seeking traditional Japanese aesthetics.
• Hiraya (平屋) Single-story custom home offering open space and comfortable year-round living with step-free accessibility. Targeted at Japanese homebuyers seeking single-story layouts.
• 3-Story Home (3階建て) Multi-story custom home designed for effective land use, additional rooms, or multi-generational living. Targeted at Japanese homebuyers needing to maximize urban lot use.
• Land & Completed Home (建売) Sales Online platform for searching available land and completed (built-for-sale) ICHIJO homes, providing end-to-end land procurement and home purchase. Targeted at Japanese homebuyers seeking ready-built or land-bundled options.
• i-flat Mortgage (一条の住宅ローン) ICHIJO's own branded mortgage product offered to facilitate home purchases for buyers of ICHIJO custom homes. Targeted at Japanese homebuyers financing their ICHIJO home purchase.

Quantifiable outcome

• Annual cooling/heating cost savings of ~90,000 yen compared to standard ZEH homes
• +4 more outcomes

Named customers3 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature12 records

Partnerships

One partnership is on record.

• Sustainable open Innovation Initiative (SII)coreStrategic or Co-development Partner一条重工店 works with the Sustainable open Innovation Initiative (SII) for ZEH certification and compliance tracking, achieving industry-leading 100% ZEH rates across all operating regions and contributing to national energy efficiency goals.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Daiwa House Industry: Japan's largest homebuilder with a national network of plants and sales offices. Directly comparable as a custom-built wooden/steel housing producer, though its portfolio spans commercial, logistics, and rental housing beyond Ichijo's residential focus.
• Panasonic Homes: Spin-off of PanaHome, part of the Panasonic group; national custom homebuilder with strong technology and energy-efficiency positioning. Overlaps Ichijo on smart/energy-efficient homes and factory-produced components, though broader portfolio includes multi-family and renovation.
• Sekisui House: Second-largest Japanese homebuilder and a leading custom-home manufacturer. Comparable via its proprietary steel-frame and wooden unit systems, energy-efficient specifications, and nationwide distribution; broader product range than Ichijo.

Direct peers

• Sweden House (スウェーデンハウス): Premium Nordic-inspired Japanese custom homebuilder with strong emphasis on insulation and airtightness. Comparable to Ichijo on high-performance insulation standards, thermal envelope design, and premium custom home positioning.
• Sumitomo Forestry: A major custom wooden homebuilder in Japan emphasizing high-quality timber construction and energy efficiency. Most directly comparable to Ichijo on custom wooden houses, ZEH/insulation focus, and premium household customer base.
• Tokyu Homes (東急ホームズ): Custom home subsidiary under the Tokyu Group offering high-efficiency residential construction in the Tokyo metropolitan area. Overlaps Ichijo on premium custom housing, although more regionally concentrated than Ichijo's nationwide footprint.
• Misawa Homes: National Japanese homebuilder with a long-standing custom and prefab home offering, focused on durability and energy performance. Comparable on custom wooden/steel housing, ZEH positioning, and nationwide showroom distribution.
• Heim (積水ホーム) / Sekisui Heim: Unit housing subsidiary of Sekisui Chemical producing factory-built modular homes. Comparable to Ichijo's prefabricated panel approach and high-performance housing positioning, though using a unit-construction rather than on-site prefab-panel model.
• Asahi Kasei Homes (Hebel Haus): National custom homebuilder using proprietary Hebel concrete panel system. Comparable as a large-scale custom home manufacturer with nationwide distribution and emphasis on durability and disaster resilience (earthquake, fire).

Emerging players

• SxL (エス・バイ・エル) / Yutaka House: Japan-based custom wooden homebuilder with 2×4 construction focus. Comparable on custom wooden homebuilding and energy-efficient residential focus, though smaller scale than Ichijo's nationwide ZEH platform.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/joekun_ichijo
• YouTubeyoutube.com/channel/UCGiaiTXTbCWPkcvEWRw69VA
• Facebookfacebook.com/ichijokomuten
• Instagraminstagram.com/ichijo_official
• LinkedInlinkedin.com/company/%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE%E4%B8%80%E6%9D%A1%E5%B7%A5%E5%8B%99%E5%BA%97

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 株式会社一条工務店