Insel Fenster holds the K·LINE Expert Distributor designation — the highest accreditation K·LINE awards to partners worldwide. It is earned through rigorous technical training, installation quality audits, and certified after-sales capability. Not a commercial title — a guarantee of competence.
Factory-certified installation
Our team is trained and audited directly by K·LINE — every window performs to its full certified specification.
Technical specification support
Expert distributors advise architects and developers on system selection — not just supply and installation.
Full 10-year manufacturer warranty
Only Expert-installed K·LINE products carry the complete factory guarantee against defect.
First in Mallorca
Insel Fenster is the first and only K·LINE Expert distributor established on the island.
Our Promise
Every opening, perfected
We bring together Europe's finest window and door manufacturers with professional installation expertise built specifically for Mallorca's demanding maritime climate.
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Expert Installation
Factory-certified professionals. Every system installed to its full specification, backed by manufacturer and installer warranties.
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Maritime Certified
Mallorca's salt air demands QUALIMARINE-certified aluminium. We specify precisely what each coastal or hillside project needs.
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Five Premium Brands
K·LINE, Strugal, Renson, Kneer-Südfenster and Carinbisa — everything from a single trusted source on the island.
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Full Project Support
From specification and technical drawings to delivery logistics and post-install service, we support your project end to end.
The complete portfolio of made-to-measure aluminium joinery — 12 system families, delivered and installed by Insel Fenster.
Official accreditation
Insel Fenster is Mallorca's first K·LINE Expert Distributor — K·LINE's highest partner designation, awarded only to installers who pass factory training, installation audits and after-sales certification. This means your K·LINE windows are supplied, installed and warranted by the most qualified team on the island. Only Expert-installed products carry the full 10-year manufacturer guarantee.
Full Range
Every opening, covered
From tilt-and-turn windows to 6.8m panoramic sliding walls — the full K·LINE catalogue, exclusively through Insel Fenster in Mallorca.
Tilt & Turn
Concealed Sash Windows
20% more glazing than traditional windows. Concealed sash technology with neat, discreet aesthetics. Ideal for new build and renovation.
Uw 0.84 W/m²KTriple GlazingClass 4 Air
Sliding
2-Track Sliding Doors
The ultimate light window with wide opening. Exceptional performance combined with slenderness and contemporary design.
Wide FormatContemporary
Sliding · Panoramic
3-Track Sliding Doors
Up to 6.80m wide panoramic openings. New perspectives on the outside, flooding your home with natural light.
6.8m spanPanoramic
Sliding · Flush
Embedded Frame Sliding
Frame recessed into the wall. Maximum vision, maximum sunlight. The ultimate minimalist sliding door system.
Flush to WallMinimalistMax Light
Sliding · Hidden
Hidden Pocket Door
The sash disappears entirely between partition walls. Complete freedom of movement between inside and outside.
Concealed SashFull Opening
Sliding · New
Minima Slide
The minimum manifestation of a window. Fixed elements embedded in walls, integrating architecture and landscape seamlessly.
Ultra-MinimalArchitectural
Lift & Slide
Lift & Slide Door
Up to 300kg per sash. Near-flush floor guide eliminates the indoor-outdoor barrier. Superior thermal and acoustic insulation.
300kg/sashFlush GuideThermal Break
Acoustic · Smart
K·LINE A.I.R.
Integrated Venetian blind in the air chamber. Control solar gain. Up to 45dB acoustic insulation — among the best on the market.
45dB AcousticIntegrated BlindSolar Control
Bespoke
Specialty Shapes
Arched, trapezoidal, triangular. Any shape from the K·LINE catalogue — preserve original openings or add architectural drama.
ArchedTriangularBespoke
Entry
Entry Doors
72 models, 5,000 combinations. Graphik System® and QUATUOR personalisation with full anti-theft certification to RC class.
72 ModelsAnti-Theft RC5,000 Combos
Solar Protection
Blinds & Shutters
Integrated roller shutters, ScreenBlock blinds, adjustable louvres, mosquito nets and shutters — all factory-fitted at origin.
Roller ShutterScreenBlockLouvres
Automation
K·LINE Smart Home
Integrated DVI lock detectors, remote access and voice control via Google Home and Amazon Alexa. Your home, always connected.
Folding, sliding, curtain-wall and architectural glazing systems for projects requiring specialist aluminium beyond the K·LINE residential range.
About Strugal
Innovative solutions since 1975
Strugal has been providing innovative aluminium and PVC solutions to construction and industry for over 45 years. Their folding systems and high-performance sliding ranges complement K·LINE for large-format, commercial and specialist residential projects.
Plegables · Folding Systems
Open without limits
Strugal's folding door systems allow unrestricted communication between interior and exterior, stacking large sashes to create fully open walls of glass.
Folding · Premium
Strugal S75RP FD NOVA
Maximum hermetic performance with elegant coplanar design. Folds and stacks large sashes to create wide-span communication with the exterior. Class 4 air permeability, watertightness E750.
Class 4 AirE750 Water51mm GlazingSash H: 3500mm120kg/sash
Folding · Wide Openings
Strugal S47
Optimal solution for wide openings with no limitation on number of sashes. 48mm coplanar frame with booklet mechanism for total window opening. Straight-line minimalist aesthetic.
48mm FrameCoplanar27mm GlazingW: 500–700mmH: 2200mm max
Aluminium Windows
High-performance systems for every project
The Strugal aluminium range covers tilt-and-turn casements, large-format sliding systems and architectural curtain wall — with finishes across the full RAL palette, anodised and wood-effect options.
S160RP HORIZON · S140RP INFINITY · S125RP — panoramic sliding for large openings
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Curtain Wall & Façades
S52CR · S52NT · S52SGi — structural glazing and ventilated façade systems
Puertas · Aluminium Doors
Strugal Doors
A complete aluminium door range — exterior entrance, pivot, interior sliding, office partitions and glass terrace enclosures. Unified in colour with all Strugal windows.
Exterior · Series 400/500/600
Exterior Entry Doors
Anti-theft certified, thermal break. Smooth, milled, slat and glass-panel designs. Any RAL colour.
Anti-theft RCThermal breakFull RAL
Pivot · Statement Entrance
Pivot Doors
Floor-to-ceiling pivot entrance for maximum architectural impact. Large format, security certified.
Floor-to-ceilingLarge formatSecurity cert.
Interior · Commercial
Interior Doors & S85 Partitions
Sliding interior doors in aluminium. S85 glass office partitions for commercial and hospitality.
Interior slidingGlass partitionsHotel grade
Terrace Glazing · S72 Oasis
S72 Oasis Glass Enclosure
Parallel glass panels, floor-mounted only. Perfect complement for terraces and bioclimatic pergolas.
Floor-mountedPergola compatible
Struggling with a brief?
Tell us about your project
Our team will advise on the right Strugal system for your architecture and climate requirements.
Motorised louvre pergola systems that transform terraces into year-round outdoor living rooms — engineered and certified in Belgium.
About Renson
The European leader in bioclimatic design
Renson is the European trendsetter in natural ventilation, outdoor sun protection and bioclimatic outdoor structures. Their Camargue and Algarve pergola lines are designed, custom-manufactured and certified in aluminium — installed exclusively by authorised distributors who have been expertly trained. Insel Fenster brings Renson to Mallorca.
Flagship Model
Renson Camargue
The Camargue redefines intelligent engineering — seamlessly blending indoor and outdoor spaces. Its motorised aluminium louvres rotate to fully open or close the roof, providing perfect climate control year round.
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Motorised louvre roof Fully open or closed at the touch of a button
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All-weather sealed Integrated drainage, waterproof when closed
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Modular — unlimited size Units combine without visual interruption
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Integrated accessories LED lighting, heating, audio, side screens, glass walls
The Algarve's slender profiles and clean lines make it the ideal solution for those who demand a high-end louvred roof that integrates with any architectural style — traditional or contemporary.
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150° rotating louvres Precise control of light and ventilation
The finest pure timber windows from Kneer-Südfenster (Germany) and Carinbisa (Spain) — natural warmth, authentic beauty and outstanding thermal performance.
Wood window installations
Why Wood?
Nature's finest insulator
Wood outperforms aluminium and PVC in thermal insulation, acoustic comfort and carbon footprint. Combined with aluminium cladding on the exterior, modern timber windows deliver passive-house performance with minimal maintenance and unmatched interior warmth.
Uw 0.78
W/m²K achievable
Triple
Glazing standard
FSC
Certified timber
30yr
Manufacturer guarantee
Pure Timber · Made in Germany
Kneer-Südfenster
One of Germany's leading timber window manufacturers. From Westerheim in the Swabian Alps, producing pure wood windows and entry doors in meranti, pine and other selected species. RAL quality seal, ISO certified. The only Sentinel-Haus Institute certified window partner — proven healthy indoor air quality. We offer the Holz (wood) range exclusively.
Holz-Fenster — Classic Wood
Pure solid timber windows in modern and classic profiles. Kneer-Südfenster uses only carefully selected timber species — meranti (hardwood, durable and stable), pine (light tones, warm atmosphere) — with multi-layer water-based lacquer in any RAL colour. Tilt-and-turn standard; special shapes available.
Holz-Denkmal-Fenster — Heritage Range
Historically accurate timber windows for listed buildings and heritage renovations. Visually indistinguishable from original windows centuries old — yet meeting today's thermal insulation standards. Bespoke profiles, rain guards, beater ledges and custom joinery. Ideal for Mallorca's protected historic buildings.
Holz-Haustüren — Timber Entry Doors
Solid wood front doors with the same 4-layer paint system and quality as the windows. Multiple design lines, glass inserts, sidelight panels. Fully coordinated with the window range for a harmonious façade.
700
Employees
330k
Windows/year
Made in Spain · Since 1982
Carinbisa — Three product families
Carpintería Industrial Binéfar — Spain's reference manufacturer of wood and wood-aluminium windows since 1982. AITIM & AENOR certified. Passive House certified V92 series. FSC / PEFC sustainable timber throughout. Supplied to Four Seasons Madrid, Hotel Catalonia and leading Passive House projects across Spain.
European system IV68 · Wood
Serie DJ68
High-performance European wood window system (IV68) — versatile for new build and renovation. Laminated pine, iroko or oak. Multiple opening types including tilt-and-turn, projecting and sliding. Classic choice for heritage and contemporary architecture.
Maximum performance European wood window system (IV92). Passive House (phB) certified in laminated pine. Triple glazing standard. Ideal for Passive House, energy-efficient new builds and high-specification renovation. Used at Four Seasons Madrid and Casa Monago Passivhaus.
Concealed-sash window in wood and aluminium. Exterior face selectable in wood or aluminium. Minimal frame maximises glazed area and natural light. The contemporary Carinbisa signature product for modern architecture projects.
High-performance PVC joinery with Class A profiles, superior acoustic and thermal insulation — exclusively from Strugal's NAZAN finished-window range.
Why Strugal PVC?
Premium PVC. No compromise.
Strugal PVC joinery meets the strictest CTE thermal transmittance requirements for all Spanish climatic zones. Class A profiles with 3mm wall thickness and 7-part titanium dioxide formulation for maximum UV and solar resistance. 18 laboratory tests per profile batch.
Class A
Profile wall thickness 3mm
46 dB
Maximum acoustic insulation
18
Laboratory tests per profile
Strugal · NAZAN Range
The complete PVC collection
NAZAN is Strugal's dedicated finished-window division. The range covers hinged casements and the ÁVALON lift-and-slide balcony door — all using Strugal's own Class A PVC profiles, hardware and seals.
Hinged · High Performance
Crono
84mm frame depth, 6-chamber sash profile with thermal break reinforcement. Best thermal performance in the market. Available in visible and concealed sash versions.
84mm frame6-chamberUw 0.79 W/m²K54mm glazing
Hinged · Traditional Look
Crono Rustic
Same technical performance as Crono but with straight-cut corner joints that evoke traditional timber windows. Perfect for heritage or rural architecture.
84mm frameTimber aestheticUw 0.79 W/m²K
Hinged · Efficient
Domus+
70mm frame, 6-chamber sash with excellent energy efficiency. Uw from 0.9 W/m²K. Available in standard and coplanar versions. Most popular PVC system for residential.
70mm frame6-chamberUw 0.9 W/m²KCoplanar option
Lift & Slide · Large Format
ÁVALON
Lift-and-slide system for large enclosures. 170mm deep frame, up to 3.3m wide × 2.8m high per sash, weighing up to 300kg. Class 4 air, 7A watertightness, 42dB soundproofing.
170mm frame3.3×2.8m sash300kg/sash42dB RwClass 4
Finishes
Colour without limits
Strugal PVC is available in plain RAL colours, wood-effect textured finishes and bicolour options — interior and exterior can differ. Profiles are UV-stabilised with Class S titanium dioxide for maximum colour fastness in Mallorca's intense sun.
Every reason why architects, developers and homeowners across Europe choose K·LINE for their most important projects.
The Arguments
Built on evidence, not promise.
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Industrial Manufacturing
Designed, developed and manufactured in Europe with full supply chain control. Automated processes and laboratory-tested quality standards ensure every unit performs to specification.
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10-Year Guarantee
Products installed per professional best practice are guaranteed against any manufacturing defect. Only possible through exhaustive control of materials, production and site installation.
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Precise Delivery Times
Semi-automated manufacturing and supply chain management make delivery times predictable even under high demand. 2,500 units per day, delivered with own logistics fleet.
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Full Product Traceability
Every unit carries a unique QR code: dimensions, glass spec, colour references, CE data, installer identity and installation date — fully traceable for the life of the product.
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After-Sales Service
Windows arrive packed and are installed by company-trained professionals. Any deficiency is escalated directly to K·LINE's factory quality control department.
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Most Certifications
CE Marking, Applus, AEV Classification, CEKAL, EWAA/EURAS, QUALIMARINE, Energy Efficiency and Indoor Air Emissions — all independently verified.
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Smart Home Ready
Integrated DVI lock detectors with smartphone monitoring. K·LINE Smart Home is compatible with Google Home and Amazon Alexa — voice and remote control standard.
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Maximum Light & Insulation
Concealed sash gives 15% more glazing. Thermal insulation reaches Uw 0.84 W/m²K. Acoustic ranges from 30dB standard to 45dB with A.I.R. glazing.
About K·LINE
European leader in aluminium joinery
K·LINE is the European leader in made-to-measure, ready-to-install aluminium windows and doors. Subsidiary of the French K·LINE group, headquartered in Les Herbiers.
Six manufacturing plants across Spain and France — 150,000 m² covered. 2,300 employees. €445M turnover (2021). Part of Liébot Group, €700M revenue, 3,850 employees.
Via Pollentia, 21, Bajos 07460 Pollença, Mallorca Balearic Islands, Spain
Showroom Hours
Monday – Friday: 9:00 – 18:00 Saturday: 10:00 – 14:00 By appointment also available
Enquiry Form
Tell us about your project
Solar Protection · Markilux & Gaviota
Toldos & Awnings
Precision solar protection for terraces, facades and pergolas. Motorised Markilux systems and Gaviota Climatika bioclimatic pergolas.
Markilux · Made in Germany
German precision awning systems
German manufacturer specialising in premium awning systems for over 65 years. Cassette awnings, vertical screens and pergola fabric systems for Mallorca's climate.
—Toldo Cofre · Cassette awning with sealed housing
—Toldo Vertical · Privacy and wind screen
—Toldo de Pergola · Tensioned fabric for pergola structures
Minimalist sliding and hinged glass systems, curtain walls, pergolas and doors - designed and manufactured locally in Polígono Industrial Marratxí.
About Zenline
Technology, design & efficiency
Zenline transforms spaces through minimalist architectural solutions. From large sliding systems to terrace enclosures, pivot doors and exterior entry doors - all made and supported locally in Mallorca.
-Zenline Arquitectura: RPT sliding and hinged systems
The world leading roof window brand - daylight, fresh air and a connection to the sky in every space.
About VELUX
More light. More life.
VELUX has dedicated over 80 years to bringing daylight and fresh air into homes. Founded in Denmark in 1941, installed in millions of homes worldwide. Insel Fenster supplies and installs the full VELUX range across Mallorca.
Product Range
The complete VELUX range
Most Popular
Centre-Pivot
Pivots 180 degrees for easy cleaning. Triple glazing, A++ energy. Sizes 55x78 to 114x118cm.
Top-Hung
Top-Hung
Opens from the bottom - unobstructed sky view. Ideal for loft conversions with limited headroom.
Electric · Smart
VELUX INTEGRA
Fully motorised with rain sensor. App and voice control - Alexa, Google, Apple HomeKit.
Flat Roof · 0-15 degrees
Flat Roof Windows
Fixed or opening for flat and low-pitched roofs. Double or triple glazing. Custom sizes.
Balcony · Premium
VELUX CABRIO
Transforms in seconds from roof window into a full balcony. No permit typically required.
Sun Tunnels · Blinds
Sun Tunnels and Accessories
Daylight into rooms without roof access. Blackout, pleated, duo blinds in electric versions.
Bring Light In
Plan your VELUX project
Our team will advise on the right VELUX system for your roof pitch, space and budget across Mallorca.
Applus
CEKAL
EURAS
QUALICOAT
QUALIMARINE
CE Marking
