What Olster Dakwerken does

Olster Dakwerken B.V. is a Netherlands-based specialist roofing contractor founded in 1984 and headquartered in Steenwijk, Overijssel. The company designs, installs, and maintains flat and pitched roofs for professional building managers, property owners, construction firms, housing corporations, government entities, and educational institutions. Its core technical offerings cover bituminous membranes (Derbigum), EPDM, PVC, and insulated panel systems, with differentiated capabilities in modular/prefabricated roof construction (IFD-Bouwsysteem integration), circular and sustainable roofing (Cradle to Cradle materials, demountable layers, green/sedum roofs, solar integration), energy-roof systems, and permanent fall-protection installations compliant with NEN 6050.

The business operates on a project-based revenue model, earning income through competitive tenders, design-and-build contracts, and direct advisory engagements for both renovation and new-build work, supplemented by specialized consulting and 24/7 emergency repair services for existing clients. Go-to-market is exclusively direct B2B: relationship-driven advisory, public/private tender participation, and chain-partner subcontracting with main contractors (BAM, Salverda Bouw, De Groot Vroomshoop Bouwsystemen). Pricing is quote-based per project, with a 10-year DAKMERK project guarantee backed by an external guarantee fund providing competitive insulation. The company is privately held with no external equity funding, operates exclusively in the Dutch market, and maintains a DAKMERK membership alongside ISO 9001, ISO 14001, VCA**, and KOMO BRL 4702 certifications, as well as authorized Derbigum processor status since 1985. With 13 current employees and over 4 million m² of roofing installed since founding, Olster is a focused specialty trade firm whose growth depends on the Dutch construction and renovation cycle, sustainability-driven public-sector tenders, and continued integration with modular construction partners.

Name

Olster Dakwerken

Legal name

Olster Dakwerken BV

Website

https://olster.nl

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

11–50 employees

Ownership category

akta.pro rank

Product category

Commercial Roofing Services

NAICS

Roofing Contractors (238160), Roofing Contractors (23816)

SIC

Operative Builders (1531)

akta.pro primary industry

Roof Installation & Replacement (HSAPAKAA)

akta.pro secondary industry

Roof Inspection, Preventive Maintenance & Tune-Ups (HSAGAKAH)

Keywords

• Commercial roofing services
• Roof renovation contractors
• Modular roof systems
• Sustainable roofing solutions
• Flat roof construction

Headquarters

HQ city

Steenwijk

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Roofing Construction Services (Renovation & New Build): Project-based contracts for flat and pitched roof renovation and new-build. Revenue is earned through competitive tenders, design-and-build contracts, and direct advisory engagements. Includes roof inspections, maintenance planning, and emergency repair services.
2. Specialized Roof Consulting: Advisory services on renovation, new-build, safety, and sustainability roofing challenges for professional building managers, owners, and maintenance companies. Often bundled with execution contracts.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Olster Dakwerken is a specialist roofing contractor delivering end-to-end services for flat and complex roofs across the Netherlands, including renovation, new construction, maintenance, safety/fall protection, sustainability upgrades, modular/prefabricated roof systems, and 24/7 emergency leak repair. Projects are secured through direct advisory, competitive tenders, and Design & Build contracts with professional building managers, property owners, construction firms, government bodies, educational institutions, and housing corporations.

Product overview

Olster Dakwerken is a specialist roofing company offering an integrated suite of services for flat and complex roofs. The core offerings include Renovatie (renovation), Nieuwbouw (new construction), Onderhoud (maintenance), Veiligheid (safety/fall protection), Duurzaamheid (sustainable solutions), and Modulair bouwen (modular construction). These services work together to provide complete roof lifecycle management—from initial consultation and design through construction, renovation, maintenance, and emergency repairs. The company specializes in complex and special roofs, circular building practices, and sustainable roofing solutions.

Differentiator

Problem solved

Functional benefit

Products and services

• Renovatie (Roof Renovation) End-to-end roof renovation services including advice, planning, and execution for flat and pitched roofs, with coordination for building users and neighbors. Targeted at professional building managers, property owners, and construction/maintenance firms managing aging roof assets.

Quantifiable outcome

• 4,000,000+ m² of roofing installed since 1984
• +5 more outcomes

Named customers15 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered core and minor.

• De Groot Vroomshoop BouwsystemencoreStrategic or Co-development Partner · 1 January 2017Recurring strategic partner in modular/prefabricated construction projects. Olster provides roofing insulation and high-quality PVC/EPDM membrane roofing for De Groot Vroomshoop's modular housing, school, and commercial building projects across the Netherlands. Collaboration spans from the design phase through execution, leveraging De Groot Vroomsop's IFD-Bouwsysteem and Olster's roofing expertise. Notable joint projects include Finch Buildings Leiden (2017), Klein Amsterdam school (2016), Wellant College Boskoop (year not stated), Wellant College Utrecht (year not stated), Migrantenhuisvesting 't Veld (2018), Semi-permanente Appartementen Drachten (2017), and Yarden Crematorium Oosterhout (2015).
• BAM BouwminorImplementation/ SI/ Consulting Partner · 1 January 2017Olster was selected by BAM Bouw to deliver the sustainable roofing package for the Stadhuiskwartier Deventer project (BNA Gebouw van het Jaar 2017, BREEAM Excellent). Olster acted as a specialist subcontractor within BAM's main construction contract.
• Salverda Bouw BVminorImplementation/ SI/ Consulting Partner · 1 January 2017Olster worked with Salverda Bouw BV as a specialist roofing partner on the Vitens Vechterweerd Dalfsen (BREEAM Excellent) and Vitens Zeddam (Dak van het Jaar 2017) projects, as well as the Achmea Zwolle new-build project via Bouwcombinatie Salverda Trebbe vof.
• DerbigumcoreTechnology or Integration · 1 January 1985Olster has been an authorized Derbigum processor since 1985. Derbigum is a high-quality bituminous roofing membrane manufacturer. As an authorized processor, Olster can offer Derbigum's Titanium insured project guarantee to clients and has access to premium roofing materials backed by Derbigum's technical support.

Scale indicators3 records

Recent moves9 records

Expansion highlights4 records

Emerging players

• Finch Buildings: Modular, sustainable building system developer (housing, schools, urban infill) that is a downstream customer of Olster's roofing expertise via the De Groot Vroomshoop partnership. Relevant as an adjacent emerging player operating in the same modular + sustainability niche.

Broad incumbents

• TBI Holdings: Dutch group of technical and building companies covering construction, real estate and infrastructure. Relevant incumbent due to its size, Dutch national footprint, and ability to self-perform roofing in-house on large tenders.
• BAM Bouw en Vastgoed: One of the largest Dutch general contractors and a known counterparty of Olster (e.g., Stadhuiskwartier Deventer). Not a direct competitor for pure roofing subcontracts, but its in-house building envelope capability and procurement scale set the ceiling on subcontractor pricing power.
• Dura Vermeer: Large Dutch construction and real estate developer with significant renovation, residential and modular exposure. Comparable as a Dutch national builder that also engages — and competes with — specialty roofing contractors on tenders.
• Koninklijke VolkerWessels: Major Dutch construction group with broad building envelope capabilities, including integrated roofing and sustainability offerings. Relevant incumbent that competes with specialty roofers on design-and-build tenders in the Netherlands.

Direct peers

• Koninklijke Van Besouw: Long-established Dutch roofing specialist with strong positions in flat-roof renovation and sustainable solutions. Comparable to Olster as a quality-focused, certified specialty roofer serving professional B2B clients in the Netherlands.
• Oranjedak: One of the largest flat-roof specialist contractors in the Netherlands (now part of Kingspan), offering bituminous, single-ply, and sustainable roofing across new-build and renovation. Closest direct comparable to Olster in terms of service mix, customer base (building managers, contractors, public sector) and Dutch national coverage.
• Altebra Dakwerken: Dutch roofing contractor focused on flat roofs, maintenance and sustainable solutions. Direct peer to Olster in size, customer type (property managers, contractors, housing corporations) and Dutch B2B project model.
• ZND Nedic Dakwerken: Established Dutch roofing contractor with national coverage across flat-roof renovation, new-build and maintenance. Comparable to Olster as a multi-disciplinary B2B roofing specialist operating in the same tender markets.
• Van der Heijden Dakwerken: Specialty Dutch roofing contractor delivering flat and pitched roof solutions across new-build, renovation and maintenance. Comparable to Olster on service scope, certifications-driven positioning, and project-based tender approach.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/olster

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 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 Olster Dakwerken