Klaassen dakkapellen

What Klaassen dakkapellen does

Klaassen Dakkapellen (legal entity Bouwbedrijf G. Klaassen B.V.) is a privately held Dutch specialist construction company that designs, manufactures, and installs custom prefabricated dormer windows (dakkapellen) for residential homeowners. Founded in 1981 and headquartered in Hulshorst, the company operates an in-house factory that produces the bulk of each dormer — covering construction, insulation, frames, and finishing — before transporting it to site for installation, typically completed within a single day. The product portfolio spans three material categories (Kunststof/PVC, Houten/wood, and Metalen/zinc or aluminum cladding) with multiple named models (Basismodel, Kadermodel, Klassiekmodel, Modernmodel for plastic; W.B.P. multiplex and Western Red Cedar variants for wood) plus an accessories line of rolluiken, screens, plisségordijnen, VELUX dakramen, and insect screens. Each dormer carries a 10-year warranty.

The business runs a sales-led, consultative go-to-market focused entirely on Dutch residential consumers. The acquisition funnel begins with online or phone inquiries, progresses to free in-home consultations (advies aan huis) where advisors measure and provide price indications, supports an appointment-only showroom in Hulshorst, and culminates in a custom quote, permit handling, factory prefabrication, and on-site installation by the company's own teams. Pricing is unit-based on size and material, ranging from approximately €6,000 for a compact 2m model up to €16,000+ for wide custom configurations, with accessory add-ons and volume discounts for multi-dormer projects. Installation volume is reported at approximately 900 dormers annually nationwide, supported by curated A-label supplier partnerships (Trespa, Keralit, NORU, GEALAN, AGC Glashandel, DUCO, VELUX, KeJe, SunCircle, Topskin) and verified by 897 customer reviews averaging 4.8/5. Owner Gerrit Hulshof runs the business; no external funding, parent company, or public listing is disclosed in the available material.

Name

Klaassen dakkapellen

Legal name

Bouwbedrijf G. Klaassen B.V.

Website

https://klaassen-dakkapellen.nl

Company type

Private

Founded year

1981

Operating status

Operating

Headcount range

1–10 employees

Short description

Klaassen Dakkapellen is a privately held Dutch construction company, founded 1981 and based in Hulshorst, that designs, prefabricates in its own factory, and installs custom dormer windows (dakkapellen) for residential homeowners across the Netherlands, completing roughly 900 installations per year.

Ownership category

akta.pro rank

Product category

Dormer Windows (Dakkapellen)

NAICS

Wood Window and Door Manufacturing (321911)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Windows (IMADAIAC)

Keywords

• Prefabricated dormer windows
• PVC dormer construction
• Wooden dormer windows
• Metal dormer cladding
• Residential attic renovation

Headquarters

HQ city

Hulshorst

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Dormer window sales and installation: One-time sale and installation of custom prefabricated dormer windows. Prices range from approximately €6,000 for a compact 2m model to €16,000+ for wide custom models. The company offers accessories (roller shutters, screens, pleated curtains) and interior finishing as additional services. Multiple dormers ordered simultaneously often qualify for volume discounts.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Klaassen Dakkapellen designs, prefabricates, and installs custom dormer windows (dakkapellen) for Dutch residential homeowners, producing approximately 900 units per year. The product line covers three material families — Kunststof (PVC), Houten (Meranti wood), and Metalen (zinc/aluminum) — with named models and optional accessories such as roller shutters, screens, and pleated blinds, complemented by free in-home consultation, permit assistance, and a 10-year warranty.

Product overview

Klaassen Dakkapellen is a Dutch specialist construction company (Bouwbedrijf G. Klaassen B.V.) operating since 1981, designing and building custom prefabricated dormer windows (dakkapellen) entirely in-house at their own factory in Hulshorst. The core product portfolio consists of three main dormer types: Kunststof (plastic/UPVC), Houten (wooden), and Metalen (metal — zinc or aluminum cladding), each available in multiple named models (e.g., Basismodel, Kadermodel, Klassiekmodel, Modernmodel for plastic; W.B.P. multiplex and Western Red Cedar variants for wood). Dormers are offered alongside an accessories line (rolluiken, screens, plisségordijnen, dakramen/VELUX, insect screens, laminated and insulating glass, cross-bars, ventilation grilles) and complementary services including free in-home consultation, showroom visits, permit assistance, in-house factory prefabrication, professional one-day installation, and a 10-year warranty. The company places approximately 900 dormers annually across the Netherlands.

Differentiator

Problem solved

Functional benefit

Products and services

• Metalen dakkapel Metal dormer window with zinc or aluminum exterior cladding (flat sheet or seamed panels), inward-opening draai-kiepramen, HR++ or HR+++ glazing, burglary-resistant frames, and a ventilation position. Available in standard and special colors. Requires no painting.
• Houten dakkapel Wooden dormer window made from Meranti wood frames with rotary or tilt-turn windows. Exterior cladding in W.B.P. multiplex guarantee board or Western Red Cedar planks. Delivered with primer coat; optional professional painting in chosen color.
• Kunststof dakkapel Plastic (UPVC) dormer window — maintenance-free, burglary-resistant, with high insulation value and long service life. Available in four models (Basismodel, Kadermodel, Klassiekmodel, Modernmodel), with tilt-turn windows, recessed profile, and standard white or cream-white finish plus other color options.
• Dakkapel accessoires Range of dormer window add-ons including laminated glass, extra insulating glass, sun-blocking glass, soundproof glass, cross-bars (kruisroeden), ventilation grilles, VELUX roof windows, roller blinds, pleated blinds (plisségordijnen), insect screens, roller shutters (rolluiken), and screens. Delivered simultaneously with the dormer window.
• Advies aan huis Free, non-binding in-home consultation where a Klaassen advisor visits the property, assesses roof structure, discusses wishes, shows examples, and provides a clear price indication for a custom dormer window.
• Showroombezoek By-appointment showroom visits at the Hulshorst location where prospects can examine materials, finishes, colors, and accessories and receive advice from a consultant over coffee.
• Montage dakkapellen Professional installation of prefabricated dormer windows by Klaassen's experienced in-house installation teams, typically completed within a single day on-site.
• Service & Garantie

Quantifiable outcome

• Approximately 900 dormer windows installed annually
• +3 more outcomes

Named customers3 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• TrespacoreTechnology or IntegrationTrespa provides smooth plastic facade cladding (buitenzijde) for dormer window exteriors, contributing to the durability and aesthetic finish of the products.
• KeralitcoreTechnology or IntegrationKeralit supplies Kunststof facade cladding with wood-grain texture (houtnerf-look) for dormer window exteriors, offering a natural wood appearance with Kunststof durability.
• NORUcoreTechnology or IntegrationNORU provides wooden window frames (houten kozijnen) used in wooden dormer window constructions.
• GEALANcoreTechnology or IntegrationGEALAN supplies Kunststof window frames for dormer windows, contributing to the Kunststof product line's durability and insulation properties.
• AGC GlashandelcoreTechnology or IntegrationAGC Glashandel provides laminated glass, extra insulating glass, sun/glass-protective glass, and cross bars for dormer windows.
• KeJe RaamdecoratieminorChannel Partner/ Reseller/ DistributorKeJe Raamdecoratie supplies window decorations including roller blinds, pleated curtains, and insect screens that complement dormer window installations.
• SunCircleminorChannel Partner/ Reseller/ DistributorSunCircle provides roller shutters and screens (rolluiken en screens) for dormer windows, offering heat protection, privacy, and burglary resistance.
• Nederhoff KraanbedrijfminorOthersNederhoff Kraanbedrijf provides crane services for transporting and lifting dormer windows onto roofs during installation.

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Others

• Aluplast: German PVC window profile systems manufacturer serving many European window fabricators. Adjacent ecosystem player in the PVC profile technology that powers Klaassen's Kunststof dormer line.
• REHAU: German polymer solutions provider with a sizable window and door profile business. Adjacent upstream supplier to Klaassen on PVC profiles and window/door componentry, though not a direct competitor in prefab dormers.
• GEALAN: German PVC window profile systems supplier and a core supplier to Klaassen for its Kunststof dormer line. Adjacent ecosystem participant whose profile technology underpins Klaassen's most popular product variant.

Broad incumbents

• Koninklijke BAM Groep: Largest Dutch construction group with broad homebuilding and renovation operations. Competes for the same residential renovation projects and shares a national footprint, though at significantly larger scale and broader scope than Klaassen's specialist focus.
• VolkerWessels: Major Dutch construction and real estate group with nationwide residential development and renovation activity. Broad incumbent in home renovation markets with overlapping customer base and geographic footprint.
• Heijmans: Major Dutch construction and real estate developer. Performs home renovations at scale across the Netherlands, including dormer-related work — competing for the same residential renovation wallet but from a much broader and more diversified platform.
• Schüco: German global leader in window, door, and facade systems operating at significantly larger scale across residential and commercial building envelopes. Broader incumbent whose window systems overlap with Klaassen's premium offerings and supply chain.

Direct peers

• VELUX: Danish-headquartered global leader in roof windows and skylights. Closely comparable in the overarching category of bringing daylight and ventilation into attics; VELUX is also a strategic supplier to Klaassen for dakramen, making it both an ecosystem partner and an adjacent competitor for incremental daylight upgrades.
• Fakro: Polish roof window and skylight manufacturer and one of the largest globally. Highly comparable product category (roof-attached daylight openings) with overlapping channels into new construction and renovation, particularly in European residential markets.
• Roto Frank: German roof window systems manufacturer. Comparable in attic-daylight product category, with overlapping technology focus (wood, PVC, and aluminum-clad frames, HR++ glazing) that directly mirrors Klaassen's product mix and value proposition.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/klaassen-dakkapellen

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 Klaassen dakkapellen