Alitherm 400 Windows

Alitherm 400 Aluminium Windows | Slimline Modern Windows UK | The Fenestration Network

Alitherm 400 Aluminium Windows | Slimline Modern Windows UK – national supply, survey and installation

projects@thefenestrationnetwork.co.uk

Alitherm 400 window system

is a modern, highly efficient aluminium window designed to suit both contemporary and traditional UK properties.

A Smarts Aluminium system, it delivers durability, slim sightlines and excellent thermal performance — all while providing a clean, modern aesthetic.

What Are Alitherm 400 Windows?

Alitherm 400 is part of the latest generation of

thermally broken aluminium windows

, replacing older Alitherm 300 / 600 series with enhanced performance, improved security and smoother operation.

It’s versatile, cost-effective, and extremely popular for residential homes and small commercial applications.

Call us to discuss your project

Key Features & Technical Summary

System depth – 70mm

Sightlines – Contemporary slim frame

Thermal performance – Low U-values (dependent on glazing)

Glazing – Double or triple glazing options

Security – PAS 24 option / Secured by Design

Operation – Side / top hung, fixed, tilt & turn

Finishes – 150+ RAL colours, dual colour available

Hardware – Modern & discreet handle options

Email us to discuss your project

Benefits of the Alitherm 400 System

Great balance of performance & cost

— excellent value without compromise

Slim modern appearance

— ideal for refurbishments & new builds

High energy efficiency

— compliant with Part L regulations

Low maintenance aluminium

— no swelling, warping or repainting

Strong & secure

— meets security standards when specified

Versatile configurations

— fits almost any architectural style

Perfect partner for aluminium doors

on the same façade

Ideal Applications

Residential properties (modern or traditional)

Extensions and glazed refurbishments

New-build developments

Coastal / exposed environments needing resilience

Homes upgrading from uPVC or timber

Mixed-material façade systems pairing with bifolds/sliders

Why Choose Us to Supply & Install Alitherm 400?

complete service nationwide

Technical advice & design support

Site survey & measurements

Bespoke UK manufacturing

Professional installation

Aftercare & warranty

We supply directly to homeowners, self-builders, architects, contractors, and property developers.

Related Systems & Alternatives

Looking for other aluminium window styles?

Heritage / steel-look windows

(AW-47 system)

Slimline premium systems

(GW70 / Cortizo)

Matching aluminium doors

for cohesive aesthetics

Alitherm 400 Windows — Supplied & Installed Across the UK

We supply and install the Alitherm 400 aluminium window system nationwide, bringing high performance, modern aesthetics and specialist installation to both residential and light-commercial properties.

South & South East

Alitherm 400 Windows London, Kent, Surrey, Sussex, Hampshire, Southampton, Home Counties and Essex.

Whether you’re upgrading a townhouse in London, restoring a property in the Home Counties or installing new windows along the coast, our South & South East team provide full supply, installation and after-care.

South West & West

Alitherm 400 Windows Devon, Bristol and Gloucester.

In the South West region we support new build projects, renovations and heritage conversions, delivering the Alitherm 400 system with precision and professional service for your property.

Midlands & Central

Alitherm 400 Windows Birmingham, The Midlands, Northamptonshire, Nottinghamshire, Leicestershire, Derbyshire and Lincolnshire.

Our Midlands installation teams offer efficient lead-times, experienced surveyors and reliable fitting of the Alitherm 400 system across a wide range of project types.

Alitherm 400 Windows Greater Manchester, Manchester, Lancashire, Liverpool, Cheshire, Cumbria and Carlisle.

From urban apartments to countryside homes and commercial refurbishments in the North West, we deliver the Alitherm 400 windows with local knowledge and full project support.

Yorkshire & North East

Alitherm 400 Windows Yorkshire, Newcastle and the North East.

Whether you’re renovating in Yorkshire, fitting new build windows in the North East or specifying high-end aluminium systems, our teams install the Alitherm 400 window system with full specification, colour and hardware choice.

The Fenestration Network

The Fenestration Network is a trading style of Evans Sales Group Ltd. All insurances are available to view upon request.

Our November 10% discount applies to all orders placed before 30th November 2025, applicable only to quotes produced from 15th October 2025.

We aren't CPS scheme registered ourselves but a lot of our installers are. If you require a CPS sign off please let us know at quoting stage and we can add this in to the quote. If you don't ask us for CPS sign off then it is expected that you will arrange yourselves with building control at your local council.

Caera Mahoney

19:17 05 Dec 25

We were originally going to order our patio doors supply only and get our builders to fit them, but after reading some of the advice from Nick at doorandwindowexperts we realised it was too big a risk for such an important and expensive purchase. Nick recommended Tom at The Fenestration Network and from the very first contact we felt really looked after; no question/query was too much trouble and we received a truly individual service. We opted for the full survey, supply and fit even through it stretched our budget and I'm glad we did. The communication was great, the lead time was reasonable and the fitters were really lovely. We are very happy with our new doors! 😊

Simon Bates

08:46 02 Dec 25

Fantastic service from start to finish Tom was great to deal with along with the Survey meeting the lads before they started to double check everything. The fitting team turned up on time today with the delivery also was almost finished for 11 o’clock very impressive., Considering the size of the units and the Power needed to do this job was very difficult and had to be thought out and planned correctly they nailed it, the trimming and silicone’s skills were second to none . Will look forward to using this business again for any window door installation , large profile glass installation.Etc

tracy wake

17:44 14 Oct 25

Great company to deal with professional and extremely knowledgeable exactly what we as the supplier and the end user (customer) needs

Allan Barker

18:18 10 Oct 25

Fenestration network have supplied and fitted some top class bi-fold doors in our extension project.
A clear payment plan which is in line with all top window/door suppliers
Good communications throughout the process
The company was found with assistance of an online expert who is keen to advise on reliable, expert supply and fit companies at a reasonable price, not expensive like some other companies I visited.
If you have a building project I would recommend Fenestration Network, make contact and speak with Tom.
They will be able to advise on different types of doors depending on your requirements.
I would highly recommend you contact Febestration Network for stunning, top quality, High end doors.

Matthew Hall

16:25 01 Oct 25

I have really enjoyed working with The Fenestration Network. Every job I have been involved in has been exactly as described, with the team always being friendly and professional. When I have been on site to capture footage of properties with new glass and glazing supplied by them, the installations have looked amazing both in person and on camera.

Customers I have spoken to while on site have also told me how impressed they are with the quality of the products and services provided by The Fenestration Network.

From a drone filming and marketing perspective, the aluminium glazing products, windows, doors, and bi-folds have been fantastic. They come in a wide range of colours, which not only gives each home a unique look that perfectly matches and complements the property, but also makes the promotional videos stand out with variety and style.

The Fenestration Network clearly delivers exactly what their customers want, both in quality and in choice.

Paul Craddock

11:37 19 Sep 25

We had windows and doors supplied and fitted by Tom and his team and apart from their prices being very competitive, the quality, look and service was excellent. To add to this, Tom gave us a discount for allowing him to have a drone take pictures which will happen once all the rendering is finished. I would highly recommend them to anyone. Thank you Tom and the team

Robert Knight

10:21 29 Aug 25

I contacted Tom Evans of The Fenestration Network for my recent, significant, aluminium window supply and install project. I found Tom easy to work with and thorough on endeavouring to get everything right before the project started. There was no pressure to rush things, but he was quick to action anything needed. The installation team he used in my area of the country was polite, hard working and personable. Overall, I valued his high personal integrity displayed thoughout the project.

Stuart Wilson

08:10 15 Aug 25

From the first contact with Tom from the Fenestration Network they were very professional and very responsive.. They had been passed our project idea and I gave approximate sizes for bi-fold doors/windows for our outside terrace…

We wanted to fully enclose it, within 48 hours Tom came back to me with a priced quote which was exceptional…. Full detailed drawings of each view suggesting top openers on one side…. My experience has been first class, I have previously been in the Architectural industry for 12 years manufacturing these type of products and was impressed how this company worked.

I agreed the price and within 1 week Tom had arranged for a site survey to finalise the dimensions…. The installation team that Tom used for the survey and installation were very good and very keen to do a fantastic job, the 2 guys (Matt & Gary) couldn’t do enough for us.

The end product was a great addition you our property giving us a fantastic room which we can use all year round.

I would have no reservations in recommending this company for any projects you are planning in the future…

See attached video of the finished project.

Matthew

15:19 13 Aug 25

Excellent from start to finish very professional company to deal with and great products

Bradley Roberts

12:14 08 Jul 25

We used The Fenestration Network for the replacement and installation of all our windows and patio doors as part of our renovations. We ran into some difficulties during the installation but the team were dedicated to getting us back on track! Would recommend to others looking for window and door installers.

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