BAS1S Architecten

What BAS1S Architecten does

BAS1S Architecten is a private architectural design practice headquartered in Poeldijk, Zuid-Holland, Netherlands, serving clients primarily in the Westland region and surrounding areas. The firm traces its lineage to the previous century through predecessor practices founded by Kees Breumelhof and was reorganized under the BAS1S name in 2011 by Bas Breumelhof and Siu Kin Shek; Siu Kin Shek has been sole owner since 2021. The firm employs 6 staff, organized as architects, assistant designers, and technical designers (including a BIM coordinator and BIM modeler), and delivers projects end-to-end from initial concept through to final completion, using 3D design techniques for both client presentation and technical elaboration.

The firm operates a single core service line — comprehensive architectural design and project management — across six verticals: residential, commercial/business, healthcare, recreation/hospitality, public buildings, and spatial development. Notable projects include the sustainable Het Landhuis office building for Blue Bricks B.V. (2021-2025) using demountable timber construction and natural materials, the Certhon Expeditie greenhouse-technology facility (2019-2024), the 's Heeren Loo De Bosroos healthcare building, the De Boetzelaer public swimming pool, and the Polaner Hotel. Revenue is generated through professional services fees under custom, quote-based, multi-year contracts, with no publicly disclosed pricing. Distribution is direct-to-client via a regional open-door policy in Poeldijk, supported by a website portfolio as the principal marketing channel.

The firm has no external investors, no parent company, no subsidiaries, and no funding rounds. Its competitive positioning rests on deep regional brand recognition in the Westland market, an integrated in-house design team, and demonstrated expertise in sustainable and demountable construction. The operating footprint is strictly regional with no disclosed plans for geographic expansion, and the technology stack is conventional (3D design, BIM) with no AI/ML capability in evidence.

Name

BAS1S Architecten

Legal name

BAS1S Architecten

Website

https://bas1s.nl

Company type

Private

Founded year

2011

Operating status

Operating

Headcount range

1–10 employees

Short description

BAS1S Architecten is a 6-person, owner-operated architecture firm in Poeldijk, Netherlands, delivering full-lifecycle architectural design services — from concept through completion — for residential, commercial, healthcare, hospitality, public, and spatial-development clients across the Westland region.

Ownership category

akta.pro rank

Product category

Architectural Design Services

NAICS

Architectural Services (541310), Interior Design Services (54141)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industries

Interior Design Services (BPAHAKAB), Sustainable/Green Building & LEED Consulting (BPAHAKAG)

Keywords

• Architectural design services
• Residential architecture
• Commercial building design
• Healthcare facility design
• Sustainable construction

Headquarters

HQ city

Poeldijk

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Architectural Design Services: BAS1S Architecten provides architectural design services covering the full project lifecycle from concept to completion. The firm offers design services for various sectors including residential, commercial, healthcare, recreation, public buildings, spatial development, and transformation projects. Revenue is generated through professional services fees for architectural design, project guidance, and technical elaboration.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

BAS1S Architecten provides architectural design and project guidance services, accompanying clients from initial concept through final delivery. The firm serves residential homeowners, commercial enterprises, healthcare organizations, recreation/hospitality operators, and public/nonprofit clients across the Westland region and surrounding areas in the Netherlands. Its six-person in-house team handles all phases including concept design, technical elaboration via 3D and BIM methods, and project oversight.

Product overview

BAS1S Architecten is a traditional architecture firm offering a single, unified service: comprehensive architectural design and project management. The firm accompanies clients from concept to completion, providing in-house capabilities through a flexible team of architects, assistant designers, and technical designers. The company utilizes 3D drafting techniques for both presentation and technical execution, serving clients primarily in the Westland region and surrounding areas. Their portfolio encompasses diverse project types including new construction, renovation, repurposing, and expansion across sectors such as residential housing, hotels, healthcare facilities, public buildings, and commercial spaces.

Differentiator

Problem solved

Functional benefit

Products and services

• Architectural Design Services Comprehensive architectural design and project guidance services delivered from initial concept through final delivery. The firm serves residential homeowners (villas, bungalows, farmhouses, rooftop additions, semi-detached houses, tiny houses, restyling), commercial clients (office buildings, commercial restyling, corporate office expansions), healthcare organizations, recreation/hospitality operators (hotels, aparthotels), public and community facilities (swimming pools, public buildings), and spatial/neighborhood development projects. The in-house team uses 3D design techniques and BIM coordination/modeling for both presentation and technical elaboration.

Named customers5 records

Segments6 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Nine partnerships are on record, tiered core and minor.

• Blue Bricks B.V.coreStrategic or Co-development Partner · 1 January 2021Blue Bricks is the client and strategic partner for multiple projects including Het Landhuis (2021-2025) and Boomhut (2021). The Het Landhuis project is a modern, characteristic office building in a nature-inclusive, park-like landscape with sustainability focus on natural renewable materials and demountable construction.
• Solid TimberminorImplementation/ SI/ Consulting PartnerStructural engineer/constructor for the timber construction of the Blue Bricks - Het Landhuis project.
• OT BouwminorImplementation/ SI/ Consulting PartnerMain contractor for the Blue Bricks - Het Landhuis project.
• Element BuildingsminorImplementation/ SI/ Consulting PartnerWood construction contractor for the Blue Bricks - Het Landhuis project, specializing in timber elements.
• HespaminorImplementation/ SI/ Consulting PartnerW-installations contractor for the Blue Bricks - Het Landhuis project.
• MD-ServiceminorImplementation/ SI/ Consulting PartnerE-installations contractor for the Blue Bricks - Het Landhuis project.
• Van Hemert - Stam VOFminorImplementation/ SI/ Consulting PartnerGroundwork contractor for the Blue Bricks - Het Landhuis project.
• Rietdekkersbedrijf J. Keus B.V.minorImplementation/ SI/ Consulting PartnerThatching contractor for the Blue Bricks - Het Landhuis project.
• Van der Ende SchilderwerkminorImplementation/ SI/ Consulting PartnerPainting contractor for the Blue Bricks - Het Landhuis project.

Scale indicators2 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Mecanoo: Major Dutch architecture firm based in Delft with broad portfolio including public buildings, residential, healthcare, and recreation. Comparable as a Dutch architectural design services incumbent active in the same sectors as BAS1S.
• UNStudio: Major Amsterdam-based international architecture firm. Comparable as a broader Dutch architectural design incumbent competing for similar types of commercial, public, and residential commissions.
• MVRDV: Internationally prominent Dutch architecture firm headquartered in Rotterdam. Comparable as a broader incumbent offering architectural services across sectors in which BAS1S also operates.
• Benthem Crouwel Architects: Established Dutch architecture firm with significant portfolio in public buildings, healthcare, and commercial projects. Comparable as a broader Dutch architectural services incumbent active in overlapping verticals.
• de Architekten Cie. Larger Dutch architecture firm with broader portfolio spanning residential, commercial, and public projects. Comparable as a Dutch architectural services incumbent competing in overlapping markets and project types.

Direct peers

• studio MAKS: Smaller Dutch architecture practice with residential and transformation focus. Comparable as a similarly sized Dutch peer offering architectural design services with comparable client base and direct engagement model.
• RoosRos Architecten: Small-to-mid sized Dutch architecture firm operating in Westland and The Hague region. Directly comparable to BAS1S as a similarly sized regional practice with comparable service mix and direct-to-consumer model.
• ZUS (Zones Urbaines Sensibles): Dutch architecture and urbanism practice with focus on spatial development, transformation, and public buildings. Comparable as a Dutch peer with overlapping competencies in spatial development and transformation projects.
• VMX Architects: Mid-sized Dutch architecture firm with comparable scope across residential, commercial, and public buildings. Comparable as a similarly sized Dutch peer offering full architectural design services to similar client types.
• KAW Architecten: Dutch architecture firm with comparable size and similar residential, public, and transformation focus. Comparable as another mid-sized practice serving Dutch regional markets with a comparable service portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/bas1s-architecten

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 BAS1S Architecten