Windows
Slim casement and tilt-turn systems with polyamide thermal breaks and Uw from 0.9 W/m²K.
SIVAL — premium aluminium windows, doors, sliding systems and architectural glazing in the UK
What we do
We help you realise your project quickly and efficiently
Every SIVAL system is tested to EN standards for air, water and wind performance, with project-specific U-value reports so compliance is evidenced from day one. Thermally broken windows, entrance doors, sliders and bi-folds — one coordinated catalogue, matched finishes and a single point of accountability.
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Aluminium systems
What we offer
A complete building envelope from one catalogue: matched finishes, compatible profiles and fabricator support behind every system — from a single casement to a full curtain-wall facade.
Doors
Flush entrance doors with insulated panels, PAS 24 security and smart access options.
Sliding & Bi-fold
Lift-and-slide, minimal-frame sliders and bi-folds that open entire walls to the garden.
Architectural
Curtain walling, structural glazing, atrium roofs and rainscreen cladding, tested to EN 13830.
Our products
All Products Featured systems
Aluminium Windows
SV-7800 Thermo Plus
The robust choice in opening systems for enhanced thermal insulation!
Read More
Sliding Systems
SV-3600 Minimal
SV-3600 Minimal is SIVAL’s new sliding architectural system that combines the minimal architectural trend with SIVAL quality.
Read MoreTested & certified
Our standards
Performance you can evidence, not just admire: every system is independently tested for air permeability, watertightness and wind resistance, with project U-value reports on request.
Our Products
Questions & answers
Have any questions?
Everything you'd want to know before choosing aluminium — thermal breaks, guarantees, lead times and more — is on our FAQ page.
Contact UsUnder Part L, replacement windows in England must achieve a Uw of 1.4 W/m²K or better. SIVAL thermally broken systems typically achieve 0.9–1.4 W/m²K depending on glazing, with triple-glazed options for low-energy and passive-standard builds.
Send us your drawings, approximate sizes or an architect's schedule through the quote form. Most quotations come back within 2–3 working days, free of charge and without obligation.
SIVAL is a systems supplier: fabrication and installation are carried out by our vetted nationwide partner network, trained on our systems and covered by insurance-backed workmanship guarantees.
Properly installed aluminium systems routinely last 40 years or more. Aluminium doesn't rot, warp or corrode, and our powder-coated finishes are guaranteed for up to 25 years.
Stocked profile orders normally dispatch within 5–10 working days. Made-to-measure windows and doors typically take 4–6 weeks from approved survey — your quotation confirms a firm date.
Kind words
What clients say
Homeowners, architects and trade partners on working with SIVAL — from first quotation to final installation.
Our architect specified the SV-3600 Minimal slider for the rear extension and it's the best decision we made — a six-metre wall of glass that glides with one finger.
PNPriya Nair
Bristol · SV-3600 Minimal
Our architect specified the SV-3600 Minimal slider for the rear extension and it's the best decision we made — a six-metre wall of glass that glides with one finger.
PNPriya Nair
Bristol · SV-3600 Minimal
Our architect specified the SV-3600 Minimal slider for the rear extension and it's the best decision we made — a six-metre wall of glass that glides with one finger.
PNPriya Nair
Bristol · SV-3600 Minimal
Our architect specified the SV-3600 Minimal slider for the rear extension and it's the best decision we made — a six-metre wall of glass that glides with one finger.
PNPriya Nair
Bristol · SV-3600 Minimal
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