CERAI

What CERAI does

CERAI (株式会社 セライ) is a privately held Japanese kabushiki kaisha (stock company) headquartered at 327-0843, Horomine-cho 3930-6, Sano City, Tochigi Prefecture, Japan. The company specializes in the design, sale, custom fabrication, and installation of architectural natural stone materials — primarily marble and exterior stone — for residential and commercial construction projects across the Tochigi Prefecture region and broader Kanto area. Its service scope spans bathroom remodels, entrance and hallway stonework, exterior stone facades, storefronts, restaurant interiors, office counters, and general exterior construction, including renovation work.

The company's core operational differentiator is its direct line of communication with upstream supplier factories, which it claims enables free-form, custom stone designs unconstrained by standard prefabricated shapes. Customers initiate projects via phone or website inquiry, after which CERAI conducts iterative sketch confirmations and project planning from the customer's perspective, then manages fabrication, on-site installation, and overall construction. The company markets primarily through its official website (cerai-naturallife.com), which functions as a visual portfolio organized into marble/interior, exterior stone, and exterior construction galleries.

CERAI generates revenue through two streams: one-time sales of architectural stone materials and professional services fees for installation and construction management. Pricing is custom and project-based with no publicly disclosed rates; customers are directed to inquire directly. The company is led by Representative Director Watanabe Takumi (渡邉 匠), operates with stated capital of 5 million JPY (approximately USD 33,000), and shows no evidence of external institutional investment, parent company affiliation, or expansion beyond its single Tochigi base.

Name

CERAI

Legal name

株式会社 セライ

Website

https://cerai-naturallife.com

Company type

Private

Founded year

2007

Operating status

Operating

Headcount range

1–10 employees

Short description

CERAI (株式会社 セライ) is a privately held Japanese construction company based in Sano City, Tochigi Prefecture, that designs, custom-fabricates, and installs architectural natural stone for residential and commercial projects in the Kanto region.

Ownership category

akta.pro rank

Product category

Architectural Stone Construction Services

NAICS

Cut Stone and Stone Product Manufacturing (327991)

SIC

Cut Stone & Stone Products (3281)

akta.pro primary industry

Marble Quarrying & Dimension Stone Fabrication (IMAKAHAE)

akta.pro secondary industry

Other Dimension Stone (Slate, Sandstone, Quartzite, Travertine) Quarrying & Fabrication (IMAKAHAF)

Keywords

• Architectural stone materials
• Natural stone fabrication
• Stone installation services
• Marble construction
• Exterior stone work

Headquarters

HQ city

Sano

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Stone Material Sales: Sale of architectural natural stone materials including marble and other natural stones. Products are sold directly to customers for residential and commercial construction and renovation projects.
2. Installation and Construction Services: Full-service stone installation and construction management including exterior stone work, exterior construction, and general building construction. Services include custom fabrication coordination with suppliers, on-site installation, and project management.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

CERAI sells, plans, constructs, and manages architectural natural stone materials for residential and commercial applications. The company sources natural stone (primarily marble and exterior stone), coordinates custom fabrication directly with supplier factories, and performs full-service installation including bathroom remodels, entrance halls, exterior facades, restaurant interiors, storefronts, and office counters. Custom stone processing allows free-form designs unconstrained by standard sizes, enabling one-of-a-kind living and commercial spaces.

Product overview

株式会社 セライ (CERAI) is a single-location construction company specializing in architectural stone materials. The company operates three interconnected service areas: marble and interior stone construction (大理石・施工事例) for bathrooms, entrances, offices, and commercial spaces; external stone work (外部石工事) for facades and porches; and exterior construction (エクステリア工事) for outdoor applications. The core offering combines sales, custom processing of natural stone (天然石材特注品加工), and full-service construction management, allowing customers to commission bespoke stone designs for new construction and renovation projects.

Differentiator

Problem solved

Functional benefit

Products and services

• Architectural Stone Sales, Installation & Management (建築石材の販売・施工・管理)

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators2 records

Recent moves3 records

Broad incumbents

• LIXIL Corporation: Largest Japanese manufacturer of building products and housing materials, including exterior siding, tiles, and interior finishes. Competes with CERAI at the building-finishes layer of residential and commercial projects, especially for exterior facades and entrance areas where stone is one of several finish options.
• Kajima Corporation (\u9e7f\u5cf6\u5efa\u8a2d\u682a\u5f0f\u4f1a\u793e): Major Japanese general contractor with significant commercial-construction activity. Overlaps with CERAI in commercial interior and exterior stone installation, where Kajima's in-house finishing capability and subcontractor network can substitute for an independent specialist.
• Asahi Kasei Construction Materials (\u旭化成建材\u682a\u5f0f\u4f1a\u793e): Diversified Japanese building-materials manufacturer producing exterior wall systems, insulation, and finish products. Adjacent to CERAI as a competing exterior-finish supplier for both new-build and renovation construction projects.
• TOTO Ltd. Japan's dominant manufacturer of bathroom fixtures, ceramics, and tiles. Overlaps with CERAI in bathroom-renovation use cases where TOTO's standardized tile/ceramic wall systems compete against natural-stone finishes for the same residential and commercial bathroom remodel budgets.
• Takenaka Corporation (\u682a\u5f0f\u4f1a\u793e\u7af9\u4e2d\u5de5\u52a1\u5e97): One of Japan's top general contractors with strong design-build execution in commercial and hospitality interiors. Competes with CERAI for high-end restaurant, hotel, and office stone interior packages, often via in-house or affiliated finish-trade subcontractors.
• Taisei Corporation (\u5927\u6210\u5efa\u8a2d\u682a\u5f0f\u4f1a\u793e): One of Japan's largest general contractors, executing commercial, residential, and infrastructure projects nationwide. Comparable to CERAI because Taisei frequently specifies natural stone on hotel, office, and retail interiors, sometimes absorbing the fabrication/installation scope that boutique stone shops like CERAI typically handle.
• NICHIHA Corporation: Major Japanese manufacturer of exterior ceramic siding and wall materials. A broad-incumbent peer for CERAI's exterior-stone work (\u5916\u90e8\u77f3\u5de5\u4e8b) since NICHIHA's ceramic panels often compete with natural-stone cladding for facade and exterior-construction specifications.

Direct peers

• Maruyoshi Corporation (\u682a\u5f0f\u4f1a\u793e\u4e38\u7531\u5546\u4f1a): Long-established Japanese natural-stone specialist headquartered in Tochigi Prefecture with marble, granite, and exterior-stone divisions. Most directly comparable to CERAI as a same-region peer covering stone material supply, fabrication, and installation for architecture and construction.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat2 records

Key risks5 records

Key highlights5 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 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 CERAI