The best of both materials
uPVC thermal insulation (Uw 1.1-1.4) on the inside + lacquered aluminium skin on the outside for UV resistance, salinity protection and full RAL freedom. Kömmerling AluClip, Schüco AluInside, Internorm KF 320 and Veka Softline systems.
★★★★★ 4.9/5 on Google · Official Kömmerling AluClip distributor · In Alicante since 2010
Why choose mixed
A mixed window is not painted uPVC nor aluminium with a filling: it is a structural uPVC profile with a 1.5-2 mm lacquered aluminium skin mechanically fixed to the outside. Each material works where it performs best.
The core is a multi-chamber uPVC profile (5-7 chambers) with steel reinforcement. Same Uw as a premium pure uPVC window — the aluminium skin does not penalise thermal performance.
A lacquered aluminium skin (QUALICOAT class 2) protects the uPVC from 320 days/year of Mediterranean sunshine and from beachfront salinity.
The aluminium can be lacquered in any RAL (anthracite 7016, stone grey, bronze, wood effect). Slim, modern outer lines — white uPVC stays only on the inside.
Aluminium allows slimmer sections than uPVC: 50-65 mm visible frame vs 70-110 mm for white uPVC. More daylight, better views, minimalist facade.
With Kömmerling AluClip and Salamander systems the outer skin can be removed without touching the uPVC. You can change the RAL colour every 15-20 years — the uPVC stays as new.
It keeps the facade uniformity that building managers demand. The outer aluminium is lacquered to the block's RAL while the owner gains uPVC insulation.
Anatomy of a mixed window
A mixed window combines two distinct profiles mechanically joined — not painted or coated. The typical cross-section:
Not to be confused with: wood-effect foil uPVC (a decorative vinyl, not aluminium), or thermal-break aluminium with foam infill (that is pure aluminium with thermal break).
When to pick mixed
It is not a universal answer: in an inland flat away from the coast, pure white uPVC is still better value. These are the 6 scenarios where the aluminium-skin premium pays off.
Cabo Cervera, Cabo Roig, Cala Fustera. The outer aluminium withstands salinity without fading; pure uPVC yellows in 8-12 years under those conditions.
When the architect specifies RAL 7016 anthracite, RAL 9005 black or wood effect. Foil-laminated uPVC in dark colours degrades quickly on the coast.
Blocks with strict RAL rules. Mixed lets each owner gain uPVC insulation without breaking the building's image.
When the owner wants to maximise property value. Mixed is perceived as mid-to-upper range — pushes sale price up by 3-6% according to idealista 2025.
The outer aluminium reinforcement allows slimmer sections — better styling on large openings. Pure uPVC needs visibly heavier reinforcement.
Alicante Old Town, Calpe village, Altea Old Town. The aluminium is lacquered to the existing colour — sails through municipal inspection.
Mixed vs the alternatives
Practical comparison of the three technologies for the same opening (1.2 × 1.4 m tilt-and-turn) on the Costa Blanca. 2026 figures, installation and low-e glazing included.
| Criterion | Pure uPVC Kömmerling 76 | Mixed Kömmerling AluClip 76 | Aluminium Cortizo COR 70 RPT |
|---|---|---|---|
| Price €/m² installed | €450-650 | €580-850 | €600-1,100 |
| Thermal insulation Uw | 1.1-1.3 W/m²K ✓✓✓ | 1.1-1.4 W/m²K ✓✓✓ | 1.8-2.2 W/m²K ✓ |
| UV resistance (outer colour) | 10-15 years white | 25+ years any RAL ✓✓✓ | 25+ years any RAL ✓✓✓ |
| Outer RAL colours | Limited to foils | Full RAL ✓✓✓ | Full RAL ✓✓✓ |
| Visible outer frame | 70-110 mm | 50-65 mm ✓✓ | 45-60 mm ✓✓✓ |
| Large openings (>2 m²) | Limited | Up to 2.8 m ✓✓ | Up to 3.5 m ✓✓✓ |
| Beachfront salinity | Good | Excellent ✓✓✓ | Excellent QUALIMARINE ✓✓✓ |
| Recommended for | Inland flat, second home | Coastal chalet, association requiring facade uniformity | Large openings, minimalist facades |
Mixed is the sweet spot: uPVC insulation + aluminium styling/durability. Pricing sits between the two.
Certified mixed systems
We only work with brands holding CE marking and a Declaration of Performance (DoP). Each system has its target customer — from premium entry to Austrian top-of-range.
uPVC 76 mm + 1.5 mm interchangeable aluminium clip. Uw 1.1 W/m²K. Full RAL + anodised. The balanced quality/price option.
Ideal for: primary home, chalet in Calpe / Moraira, mid-to-upper-range owners' association.
uPVC 82 mm + 2 mm outer structural aluminium. Hidden-closure systems, invisible hardware. Premium wood-effect finishes.
Ideal for: contemporary architecture, villas in Jávea / Altea Hills.
Austrian uPVC + 2 mm solid outer aluminium. Uw 0.88 W/m²K (close to Passivhaus). 280 RAL colours + anodised.
Ideal for: high-end chalet, A+ energy-rated villa.
German uPVC 70-76 mm + 1.2 mm aluminium clip. Uw 1.3 W/m²K. The entry point to the mixed-window world.
Ideal for: tourist flat, second home with an upgraded look.
2026 prices — reference
Indicative €/m² price including VAT and installation. Standard double low-e glazing, Roto NX hardware and QUALICOAT class 2 lacquering included. A special (non-stock) RAL adds 5-8%.
Entry-level mixed
€580 — €850/m²
Veka Softline AluClip or standard Kömmerling AluClip 76. Double 4/16/4 low-e glazing. Standard RAL (white, anthracite, grey).
AluClip Pro premium
€750 — €1,100/m²
76 mm uPVC + 1.5 mm interchangeable aluminium. Triple glazing optional. 15-year warranty + full RAL.
Contemporary design
€900 — €1,300/m²
82 mm uPVC + 2 mm structural aluminium. Invisible hidden closure. Wood-effect or premium matt lacquering.
Austrian top range
€1,100 — €1,500/m²
uPVC + 2 mm solid aluminium. Uw 0.88 (near Passivhaus). 280 RAL + 12 anodised. I-tec systems with hidden hardware.
Premium over pure uPVC from the same brand: +€80-150/m² (aluminium skin + lacquering). Recouped through property-value uplift.
Standard specifications
Regulatory compliance
Every mixed window leaves the workshop with CE marking, DoP and traceability. Accepted by architects, municipal officers and homeowners' associations.
Declaration of Performance per model under EU Regulation 305/2011. Without it, the window is not legal in Spain.
The mixed windows we install meet the Uw < 1.8 W/m²K requirement and lift the energy rating by 1-2 letters.
European stamp for high-resistance oven lacquering. Doubles colour durability versus standard class 1.
Anti-salinity lacquering required within 5 km of the sea. 25-year colour warranty without alteration.
Official distributor with real stock, manufacturer-direct warranty and Academy training.
Spanish Association of Lightweight Facade and Window Manufacturers. Industry backing for the product.
Recent mixed-window projects
New-build home in La Manzanera. Norwegian customer asked for RAL 7016 anthracite outside for styling and white uPVC inside to brighten the rooms. Kömmerling AluClip 76.
La Veleta community required RAL 9001 cream on the outside. The owner wanted modern thermal insulation. A Schüco LivIng + AluInside mixed window solved both.
Full refurbishment of a 1990s flat in Pla del Bon Repós. Customer wanted modern looks with no visible white frames from the street. Kömmerling Premium plus AluClip.
Rincón de Loix block refurbished by association vote. Matt bronze AluClip outside, white uPVC inside. Coordinated with the property manager, 4-phase manufacture, 14% volume discount.
How we work
You call / WhatsApp / send the form. We advise on RAL colour, system and indicative range.
Time: same day
We bring physical RAL swatches, anodised samples and profile cuts. Measurement to the millimetre.
Time: 24-48 h
Detailed PDF: profile, glazing, outer colour, inner colour, hardware. No surprise extras.
Time: 24-72 h after survey
uPVC order + QUALICOAT aluminium lacquering to chosen RAL. Batch traceability.
Time: 3-5 weeks (with lacquering)
Our own team. Removal, fitting, perimeter sealing and end-of-works cleaning.
Time: 1-2 days per home
Full dossier: CE marking, 10-year warranty and QUALICOAT aluminium certificate.
Time: same day as installation
The team behind the product
VentanaCosta does not subcontract: we survey, manufacture and fit with payroll staff. Mixed windows have more nuance than pure uPVC (aluminium clip, differential expansion, material-to-material sealing) — that is why only trained people work on them.
More than 480 homes with mixed windows installed since 2010 across Alicante, Murcia and Valencia.
Surveyor + colour adviser
Advises on RAL choice based on orientation and the existing facade. Physical swatch book always on site.
DE/EN/RU multilingual liaison
Coordinates with international clients and with Kömmerling / Schüco / Internorm suppliers.
Lead mixed-window installer
Kömmerling Academy certified. Team of 4 specialists in AluClip systems.
Written warranties
A mixed window uses two materials — both covered by independent warranties. This is what we sign into the contract.
10 years on the uPVC profile: no yellowing, no warping, no loss of air tightness. Covers Kömmerling, Salamander, Schüco, Internorm.
Colour stability of the oven-lacquered class 2 finish. No UV fading, no flaking, no rust. Special RAL: 10 years.
Multi-point closure, no rust on hinges and locks. If closure fails or the sash sags, replacement at no cost.
Perimeter sealing with Sika Boom foam + neutral silicone. If leakage or condensation occurs, we return at no charge.
Cleaning with water and neutral soap. Annual greasing of hardware with silicone grease. No aggressive chemicals.
Cleaning twice a year with fresh water (especially beachfront) to wash off salt. Aluminium polish every 5-7 years in very salty areas.
Mixed-window FAQ
The AluClip aluminium skin adds €80-150/m² to the base uPVC price for the same brand. A pure Kömmerling 76 AD = €450-650/m²; mixed Kömmerling AluClip 76 = €580-850/m². On average, a 25-30% premium. It is recouped through property-value uplift (+3-6% per idealista 2025) and exterior colour durability (15+ years longer than foil-laminated uPVC).
Cortizo COR 70 RPT aluminium: €600-1,100/m². Mixed Kömmerling AluClip 76: €580-850/m². Practically the same range, but mixed offers 35% better thermal insulation (Uw 1.1 vs 1.8 W/m²K). Pure aluminium only wins on openings >3 m high or for extreme minimalist styling. For 90% of homes, mixed is the better value.
Any RAL across the full palette + anodised (gold, champagne, bronze, black). Best sellers on the Costa Blanca: RAL 9016 traffic white (35%), RAL 7016 anthracite (28%), RAL 9005 matt black (12%), wood effect (10%), matt bronze (8%), other special colours (7%). If your RAL is not in stock, add 5-8% for bespoke lacquering (+2 weeks lead time).
Yes. With QUALICOAT class 2 lacquering (standard on mixed) it easily withstands 25+ years of Mediterranean salinity. For highly exposed beachfront (Cabo Cervera, Cabo Roig, Calblanque) we recommend QUALIMARINE: a specific anti-salinity treatment with a 25-year colour warranty. Add 8-12% to the aluminium price.
Yes, almost always. In fact, strict associations prefer it to pure white uPVC because it can keep the block's exact colour (lacquered to the existing RAL). We provide a technical sheet and physical sample to bring to the meeting. In 14 years, zero rejections on aesthetic grounds.
Yes — every mixed system accepts a monoblock shutter (integrated box), an outer traditional shutter or Internorm I-tec-style systems with a shutter hidden inside the frame. We recommend an insulated box so as not to lose the mixed window's thermal performance. Add €80-150/m² depending on shutter type.
A pure Kömmerling uPVC window ships in 10-14 days. A mixed window: 3-5 weeks. The difference: QUALICOAT lacquering of the outer aluminium runs by batch and adds 2-3 weeks. If you ask for a non-standard RAL (not in the manufacturer's stock), add another 1-2 weeks. Plan with headroom — especially if you need delivery in July or August.
No. Inner uPVC maintenance: water + neutral soap, annual hardware greasing. Outer aluminium maintenance: fresh-water rinse twice a year (beachfront) or annually (further inland). Total extra time a year: 30 minutes per window. No special products, no painting — the oven-lacquered finish stays intact for 15-25 years.
Other window types
Mixed windows pair well with other types when the project calls for it. These are the most requested in chalets and full refurbishments.
Free on-site survey across the Costa Blanca and Murcia.
Or contact us directly:
Alicante · Elche · San Vicente del Raspeig · Mutxamel · El Campello · Villajoyosa · Benidorm · Altea · Calpe · Moraira · Jávea · Denia · Crevillente · Santa Pola · Guardamar del Segura · Torrevieja · Orihuela · Pilar de la Horadada · Almoradí · Murcia · Cartagena · San Pedro del Pinatar