GW70 Cortizo Windows | Premium Slimline Aluminium Windows UK - national supply, survey and installation
Call us: 020 341 10038 | 01768 254552
Email: projects@thefenestrationnetwork.co.uk
The GW70 (Cortizo) window system is a premium slimline aluminium window solution offering outstanding thermal performance, minimal sightlines, and modern architectural styling. Ideal for high-end residential and commercial projects where sleek aesthetics and high efficiency are essential.
What Are GW70 Cortizo Windows?
GW70 is a high-performance 70mm aluminium window system developed around Cortizo's engineering principles. It delivers slimline profiles, superb insulation values, and outstanding durability — making it a superb choice for design-led builds and renovations.
Whether you're upgrading a contemporary home, adding a glass extension, or specifying windows for a new build, this system offers a clean, modern finish with a superior feel.
Key Features & Technical Summary
Frame depth - 70mm slimline system
Sightlines - Minimal frame, large glazed area
Thermal performance - Low U-values (dependent on glazing spec)
Glazing options - Double, triple, acoustic, solar control
Security - PAS 24 compatible / multi-point locking
Colour finishes - 150+ RAL colours, dual colour available
Opening types - Casement, tilt & turn, fixed, large picture windows
Design style - Contemporary slimline aluminium
Why Choose GW70 Cortizo Windows?
- Architectural slim sightlines for maximum glass
- Outstanding thermal efficiency (better energy retention)
- Sturdy & long-lasting aluminium build
- Ideal for modern builds and premium installations
- Noise reduction options for urban properties
- Flexible configurations and large-format glazing
- Dual colour options for interior/exterior contrast
- Seamless pairing with Cortizo sliding and door systems
Where These Windows Work Best
The GW70 system is perfect for:
- Modern & contemporary homes
- Extensions and open-plan renovations
- Coastal / exposed locations needing durability
- Urban homes benefiting from slimline aesthetic
- High-end self-build projects
- Architectural new-build developments
Supply & Installation (Nationwide)
We offer a complete service:
- Survey & specification
- Design advice (sizes, glazing, finish options)
- Bespoke manufacturing
- Full installation by specialist fitters
- Aftercare & warranty
We can also coordinate with your architect, builder or structural contractor for larger projects.
GW-70 Windows — Supplied & Installed Across the UK
We supply and install the GW-70 aluminium window system by Cortizo nationwide. Whether you’re upgrading windows for better thermal efficiency, replacing for aesthetics, or specifying for a new build, our installation teams cover all major UK regions with care, expertise and full service support.
South & South East
GW-70 Windows London, Kent, Surrey, Sussex, Hampshire, Southampton, Home Counties and Essex.
From modern townhouses in London to coastal homes in Sussex and countryside retreats in the Home Counties, our South & South East team deliver full-service supply, installation and after-care.
South West & West
GW-70 Windows Devon, Bristol and Gloucester.
In the South West region we support both period home replacements and contemporary aluminium window installs, ensuring the GW-70 system meets the highest performance and finish standards.
Midlands & Central
GW-70 Windows Birmingham, The Midlands, Northamptonshire, Nottinghamshire, Leicestershire, Derbyshire and Lincolnshire.
Our Midlands network provides efficient lead-times, detailed surveys and professional installation of the GW-70 system across domestic and commercial projects.
North West
GW-70 Windows Greater Manchester, Manchester, Lancashire, Liverpool, Cheshire, Cumbria and Carlisle.
From city apartments to countryside homes, we supply and fit the GW-70 system with regional expertise and full warranty support across the North West.
Yorkshire & North East
GW-70 Windows Yorkshire, Newcastle and the North East.
Whether you’re renovating a property in Yorkshire or fitting windows in the North East region, our team installs the GW-70 system with full specification options, high-end finishes and professional service.
Related Systems & Matching Products
- Cortizo sliding systems (COR Vision / GS20)
- Slimline aluminium bifolding doors for matching performance
VIEW THE REST OF OUR PRODUCT OFFERING
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Soft Close
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Available in 2 or 3 track
1.6 W/m2K U Value
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Sightlines
Frame depth 116 mm / 182 mm 3 rails Sash depth 37 mm
Interlock 20 mm
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0.8Wm2K U-Values
Available in upto 14 panes width
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Highly practical, affordable range of Aluminium Windows available in a range of colours and designs.
Aesthetically pleasing and simple to install.
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Extensions, Orangeries, Building works around the Glazing.
Integrate Building and Glazing in one for a seamless project.
PUTTING YOUR MIND AT EASE...
A British Standard that specifies the security performance requirements for doors and windows
the official police security initiative that works to improve the security of buildings and their immediate surroundings
A British Standard that specifies the security performance requirements for doors and windows
quality glazing products, manufactured right here in the UK
the official police security initiative that works to improve the security of buildings and their immediate surroundings
A British Standard that specifies the security performance requirements for doors and windows
the official police security initiative that works to improve the security of buildings and their immediate surroundings
the official police security initiative that works to improve the security of buildings and their immediate surroundings
the official police security initiative that works to improve the security of buildings and their immediate surroundings
WHICH REGIONS DO WE COVER?
The Fenestration Network are Nationwide Supply and Installation experts in:
Bi Folding Doors/ Sliding Doors/ Entrance Doors/ Windows/ Garden Studios, Glass Balustrades, Orangeries.
Our teams have over 35 years experience supplying and installing quality Glazing products across the UK. We have teams of Surveyors, Installers and Technical Experts close to you to help guide you through your project.
We cover all regions on this map with our professional and highly skilled , local surveyors and installers.
020 341 10038 - South
01768 254552 - Rest of UK
10% off all orders placed before 30th November 2025
Applicable only to orders resulting from new quotes produced from 15th October to 30th November, must include full supply, survey and installation and must include any combination of the below:
Windows/ Bi Folding Doors/ Sliding Doors/ French Doors/ Entrance Doors/ Windows/ Garden Studios, Glass Balustrades, Orangeries.