株式会社マルニ

What 株式会社マルニ does

株式会社マルニ (Maruni Co., Ltd.) is a privately held "Total Exterior Planning" company founded in 1969 and headquartered in Shunan City, Yamaguchi Prefecture, Japan. The company operates as a one-stop service provider across four integrated business lines: exterior and exterior-construction work (fences, carports, gates, decks, lighting); land development, grading, and sales; ICT-based surveying and design (boundary surveys, subdivision registration support); and material sales (aluminum exterior products, carport components, fencing, artificial turf, lighting). It serves two primary customer segments in Yamaguchi Prefecture — individual homeowners planning new construction or renovation, and residential construction companies (jukyō-kaisha) seeking exterior-planning partners for housing projects. Revenue is generated through quote-based, project-priced engagements with multi-year contract cadences, delivered directly from the Shunan City office with no resellers or intermediaries. The company maintains an active content-marketing engine (a 480+ page blog archive covering land, surveying, and exterior-planning topics, plus an Instagram presence @maruni_ex) and offers online and LINE-based consultations. In May 2026, Maruni is scheduled to open iebeeLAB, an experiential home-building showroom that uses 3D-printed models to help customers physically experience Japanese "tsubo" (floor-area) sizing concepts, with a separate pre-opening reservation site at iebee.jp. The company's tech stack includes ICT surveying tools, VR property-viewing via a Housugo partnership, and 3D printing for in-showroom modeling. Headcount is approximately 8 employees, and no external capital has been raised; the company has been privately funded since founding.

Name

株式会社マルニ

Legal name

株式会社マルニ

Website

https://maruni-web.com

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

1–10 employees

Short description

株式会社マルニ is a Yamaguchi Prefecture-based Total Exterior Planning company founded in 1969, offering integrated exterior construction, land development, ICT surveying, and material sales to individual home buyers and residential builders in Shunan City and surrounding areas.

Ownership category

akta.pro rank

Product category

Residential Exterior Construction Services

NAICS

Residential Building Construction (2361), New Single-Family Housing Construction (except For-Sale Builders) (236115)

SIC

General Bldg Contractors - Residential Bldgs (1520), Operative Builders (1531)

akta.pro primary industry

Residential Design-Build & Renovation-Integrated Builders (IMAFABAE)

akta.pro secondary industries

Deck Design & New Deck Construction (HSAIAJAE), ADU Project Management & General Contracting (HSAPAMAO)

Keywords

• Exterior construction services
• Residential land development
• ICT land surveying
• Exterior building materials
• Residential exterior planning

Headquarters

HQ city

Shunan

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Exterior/Exterior Construction Services: Revenue generated from design and construction of exterior elements including fences, carports, decks, gates, approaches, and lighting for residential properties. Services include both new construction and renovation work.
2. Land Development and Sales: Land preparation, leveling, and development services, as well as sale of developed land parcels to customers.
3. ICT Surveying and Design Services: Surveying and design services using ICT (Information and Communication Technology) for residential land and building projects, including boundary surveys and land subdivision registration support.
4. Material Sales: Sale of exterior construction materials including fencing, carport components, artificial turf, lighting fixtures, and other exterior building materials sourced from manufacturers.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

株式会社マルニ operates as a Total Exterior Planning company providing four integrated services for residential properties: exterior construction (fences, carports, gates, decks, lighting), land development and sales, ICT-based surveying and design, and exterior building material sales. The company serves both individual home buyers planning new construction or renovation and residential construction companies seeking exterior planning partners in Yamaguchi Prefecture.

Product overview

株式会社マルニ operates as a Total Exterior Planning company offering comprehensive services spanning four core areas: exterior construction (外構・エクステリア), land development (土地活用), surveying and design with ICT (測量・設計), and material sales (資材販売). The company is headquartered in Shunan City, Yamaguchi Prefecture, and has been in operation since 1969. Their product portfolio includes branded exterior materials from manufacturers such as 三協 aluminum (Sankyo Aluminum) for carports and facades, and LIXIL for carport systems. The recent iebeeLAB initiative represents an innovative customer engagement service that uses 3D printing technology to help prospective homeowners physically experience and understand floor area concepts during the home planning process, effectively bridging the gap between their core exterior construction services and home design consultation.

Differentiator

Problem solved

Functional benefit

Brands

• iebeeLAB（イエビーラボ）: 体験型の新农村建设门店。3Dプリンティング模型を使い坪を体感しながら家を建て考えるプログラムを提供する、家づくり体感ラボ。山口県周南市に2026年5月オープン予定。

Products and services

• Exterior Construction (外構・エクステリア) Design and construction of exterior elements for residential properties, including fences, carports, gates, decks, approaches, and outdoor lighting. Services cover both new construction and renovation for individual homeowners and residential construction companies.
• Land Development and Utilization (土地活用) Land preparation, grading, and development services for residential properties, along with sale of developed land parcels to maximize property value for customers.
• Surveying and Design (測量・設計) ICT-based land surveying and design services for residential projects, including boundary surveys and land subdivision registration support. The company also houses a licensed land and building surveyor (土地家屋調査士) practice.
• Material Sales (資材販売) Sale of exterior construction materials including aluminum products, carport components, fence materials, artificial turf, lighting fixtures, and nameplates sourced from manufacturers such as Sankyo Aluminum and LIXIL.
• New Home Construction Consultation Services (新築建設咨询服务) Consultation services for individuals considering new home construction, covering exterior planning considerations before building. Online and LINE inquiries are supported.
• iebeeLAB (イエビーラボ) Home-Building Experiential Laboratory An experiential home-building showroom where prospective homeowners can physically experience and understand tsubo (Japanese floor area units) and spatial planning using 3D-printed models before committing to construction. Designed to make home planning accessible and engaging for families.

Named customers2 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Three partnerships are on record, tiered core.

• 三協アルミ (Sankyo Aluminum)coreTechnology or Integration三協アルミ is a manufacturer of aluminum exterior products including facade systems, carports (including the New Mylish carport), and exterior fixtures. The company features their products extensively in its work showcase, indicating a product supply and specification partnership for exterior construction projects.
• LIXILcoreTechnology or IntegrationLIXIL is a major Japanese building materials manufacturer supplying exterior products such as Style Court carports. LIXIL products are featured in the company's project portfolio, indicating a product supply and specification partnership.
• 土地家屋調査士 (Land and Building Surveyors)coreStrategic or Co-development PartnerThe company collaborates with licensed land and building surveyors (土地家屋調査士) for boundary confirmation and fence installation services. Approximately 200 licensed surveyors operate in Yamaguchi Prefecture, and the company works with them to ensure proper boundary delineation before exterior construction.

Scale indicators2 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• ブルースペース (Bluespace): A Japanese exterior design-build firm specializing in gardens, fences, and outdoor structures for residential clients. Direct peer in the residential exterior design-construction category.
• リアガーデン (Riagarden): A Japanese exterior/landscape planning and construction company operating across multiple regions. Comparable to Maruni's exterior construction and design-build integration for residential properties.
• ガーデンプラス (Garden Plus): A multi-region Japanese exterior construction company offering fence, carport, and garden design-build services. Directly comparable to Maruni's exterior construction product line, though operating across multiple prefectures rather than just one.
• オンリーワンエクステリア (Only One Exterior): A Japanese exterior construction franchise with nationwide dealer network, offering fences, gates, carports, and decks for residential properties. Comparable to Maruni's exterior product mix but with a franchise/distributed model.
• エクスショップ (Exshop): A multi-region Japanese exterior planning and construction company providing fences, carports, decks, and gardens. Direct peer in the residential exterior product category with a similar design-build delivery model, though at much larger scale than Maruni.

Broad incumbents

• 三協アルミ (Sankyo Aluminum): Major Japanese aluminum exterior product manufacturer and Maruni's strategic supplier. Comparable as a major exterior products incumbent whose products Maruni specifies, and whose brand appears throughout Maruni's project portfolio.
• LIXIL: One of Japan's largest building materials manufacturers with a major exterior products portfolio including carports, facades, and fencing. Comparable as a key Maruni partner/supplier and broader incumbent whose products shape the exterior product landscape Maruni operates in.

Emerging players

• ハウスゴー (Housugo): A Japanese VR property viewing technology provider partnered with Maruni to enable virtual property tours. Comparable as an emerging technology partner enabling customer-experience innovation in residential construction services.

Regional players

• 愛媛県内の外構業者 (Ehime Exterior Contractors): Regional Japanese exterior construction contractors in adjacent prefectures (e.g., Ehime, Hiroshima) with similar residential exterior service portfolios. Comparable as regional peers whose competitive dynamics would matter if Maruni expands beyond Yamaguchi.
• 国土技術建設: A Japanese surveying and land development company that overlaps with Maruni's ICT surveying and land development service lines. Comparable as a regional infrastructure/services peer with overlapping surveying expertise.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat2 records

Key risks5 records

Key highlights6 records

Customer concentration

• Instagraminstagram.com/maruni_ex
• LinkedInlinkedin.com/company/%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE%E3%83%9E%E3%83%AB%E3%83%8B

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

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 株式会社マルニ