SDSI

What SDSI does

SDSI B.V. is a Dutch private engineering studio founded in 1997 by Erik van Dongen and headquartered in Noordwijkerhout, Netherlands. The company specializes exclusively in interior engineering for luxury superyachts ranging from approximately 40 meters to over 100 meters, serving luxury shipyards, interior designers, naval architects, brokers, and yacht owners of both classic and modern sailing and motor yachts. Operations are organized around a sequential six-discipline methodology spanning Contract Design, Design Development, Final Design, Detail Engineering, Production Engineering, and General Engineering Support, delivered by a team of roughly 15 to 20 engineers, draftsmen, and project managers.

The firm's core technology stack comprises Top Solid Wood (TSW) for 3D interior modeling, AutoCAD for 2D drawings, and Rhino Ceros, with outputs including detailed assembly drawings, 3D-printed mock-ups, and CNC files that feed directly into yard workshop machinery. SDSI's competitive positioning rests on 27+ years of accumulated domain expertise, staff with hands-on carpentry and joinery backgrounds, and physical proximity to the Dutch yacht-building cluster. Tomas Dunnebier serves as Director, with Erik van Dongen remaining active in the founder role.

SDSI generates revenue through project-based professional services engagements, with custom pricing determined by yacht size, scope, and complexity; no public pricing exists. The go-to-market is exclusively direct, enterprise field sales — projects are won via industry reputation and longstanding relationships rather than marketing channels. The company is privately held, founder-owned, and has operated without external investment, acquisitions, or public capital markets activity.

Name

SDSI

Legal name

SDSI B.V.

Website

https://sdsi.nl

Company type

Private

Founded year

1997

Operating status

Operating

Headcount range

11–50 employees

Short description

SDSI B.V. is a Dutch engineering studio providing full-service interior engineering for luxury superyachts ranging from 40 to over 100 meters, serving shipyards, designers, naval architects, brokers, and yacht owners globally from Noordwijkerhout.

Ownership category

akta.pro rank

Product category

Superyacht Interior Engineering Services

NAICS

Engineering Services (54133), Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering Services (8711), Ship & Boat Building & Repairing (3730)

akta.pro primary industry

Project Management & Owner’s Engineering / Technical Consultancy (Spec Writing, Bid Support, Site Support) (IMAJAGAO)

akta.pro secondary industry

Production Design & Detailed Engineering (3D CAD, Drawings, BOM, Nesting) (IMAJAGAK)

Keywords

• Superyacht interior engineering
• Yacht engineering services
• Marine interior design
• Naval architecture support
• Yacht production engineering

Headquarters

HQ city

Noordwijkerhout

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Services: Project-based engineering services for superyacht interiors, providing comprehensive support from early-stage contract design through production engineering and workshop documentation

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

SDSI is a full-service interior yacht engineering studio providing engineering and design services for superyacht interiors ranging from 40 to over 100 meters. The company delivers a six-stage process (Contract Design, Design Development, Final Design, Detail Engineering, Production Engineering, and General Engineering Support) producing 2D and 3D CAD drawings, assembly drawings, and CNC files for workshop production. Services are delivered to luxury shipyards, interior designers, naval architects, brokers, and yacht owners.

Product overview

SDSI is a full-service interior yacht engineering studio offering a six-stage engineering process for superyacht interiors ranging from 40 to over 100 meters. The core offering comprises: Contract Design (early-stage feasibility and overview drawings), Design Development (foundational interior principles including HVAC and joinery), Final Design (Technical Arrangement drawings and 3D modeling), Detail Engineering (detailed and assembly drawings), Production Engineering (production-level drawings, workshop documentation, and CNC files), and General Engineering Support (consultancy and additional project support). These disciplines work sequentially from early-stage concept through complete production packages, serving luxury shipyards, interior designers, naval architects, brokers, and yacht owners.

Differentiator

Problem solved

Functional benefit

Products and services

• Contract Design Early-stage interior engineering support providing feasibility checks on General Arrangements and comprehensive overview drawings, ensuring a solid foundation that adheres to yard standards. Targeted at yards, interior designers, naval architects, and clients.
• Design Development Creates foundational interior principles including custom HVAC overviews, seamless interior-exterior transitions, main joinery and styling, floor and ceiling guidelines, and door design principles for multidisciplinary integration.
• Final Design Main integration phase producing Technical Arrangement drawings for room layouts and detailed 3D models integrating all components within the complete yacht model, delivering 2D Box/Net space drawings and sections.
• Detail Engineering Develops detailed drawings through Pre-engineering, creating detailed and assembly drawings reviewed for compliance with standards, including mock-up drawings when required.
• Production Engineering Develops production-level drawings and workshop documentation including walls, ceilings, doors, furniture, hardware lists, and material lists, and generates CNC files for workshop machines.
• General Engineering Support Additional consultancy and engineering support including advice on location, risk inventories, planning work, project reports, fire load calculations, detail proposals, and material overviews for superyacht projects.

Named customers5 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators3 records

Recent moves4 records

Expansion highlights4 records

Others

• Oceanco: Dutch superyacht builder and a likely SDSI customer/ecosystem partner rather than a direct competitor. Comparable in the sense that Oceanco's new-build programs create the demand SDSI's interior engineering services support.

Direct peers

• H2 Yacht Design: Superyacht interior design studio producing full interior packages for large motor yachts. Comparable to SDSI in delivering design development, detailed engineering, and production-ready documentation to luxury shipyards.
• Bannenberg & Rowell: UK-based superyacht and residential interior design studio producing detailed interior packages for large yachts. Comparable to SDSI in focusing on the high-end yacht interior design and engineering workflow.
• Studio Indigo: Superyacht interior design firm producing concept through detailed interior design for large yachts. Comparable to SDSI in serving the premium yacht interior segment with end-to-end design support to shipyards and designers.
• Vripack: Dutch yacht design and naval architecture firm offering both exterior and interior design/engineering for motor and sailing yachts. Comparable to SDSI in operating from the Dutch cluster and serving superyacht builders with full design packages.
• Sinot Exclusive Yacht Design: Dutch superyacht design firm focused on exterior and interior architecture for large motor yachts. Comparable to SDSI in targeting the 50m+ superyacht segment with multidisciplinary interior design/engineering services.
• Hoek Design: Dutch independent naval architecture and design studio for sailing and motor yachts, directly comparable to SDSI as a multi-decade Netherlands-based yacht engineering house. Notably referenced in SDSI's founder history, underscoring the comparable profile.
• Mulder Design: Dutch yacht design and engineering studio providing naval architecture and interior/exterior design for motor yachts. Directly comparable to SDSI in being a Netherlands-based design/engineering partner to luxury shipyards.
• Rhoades Young Design: Superyacht interior design and engineering firm producing detailed interior packages for large yachts. Comparable to SDSI in delivering multi-stage interior engineering deliverables to shipyards and owners.

Broad incumbents

• Winch Design: Long-established UK superyacht interior and exterior design studio serving the world's largest yacht builders. Comparable to SDSI in providing high-end interior design and engineering, but broader in scope and geographic reach.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/sdsi-bv
• Instagraminstagram.com/sdsi_engineering
• Facebookfacebook.com/sdsibv

Revenue estimate

Valuation estimate

Number of profiles

Profiles18 records

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 SDSI