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Strong. Stylish. Built to last.

For homeowners seeking a premium, contemporary finish, Thermaseal’s aluminium windows combine minimalist style with long-term durability. Designed and installed by our trusted local team, they deliver a perfect blend of modern looks, energy efficiency, and peace of mind.

Why Choose Aluminium Windows

Our aluminium windows feature slim, elegant frames that maximise natural light while maintaining outstanding thermal and acoustic insulation. The result is a brighter, warmer home that looks stunning from every angle.

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Key Features & Benefits

The list of key features & benefits

  • Slim modern profiles for maximum daylight and clean sightlines

  • Strong, corrosion-resistant frames that last for decade

  • A-rated energy performance for reduced heating bills

  • Wide range of colours and finishes, including popular anthracite grey and black

  • Low-maintenance design – no warping, peeling, or repainting

  • Secure multi-point locking systems for complete safety

A Premium Choice for Modern Homes

Ideal for new builds, extensions, and modern renovations, aluminium windows add value and sophistication. Whether you prefer a minimalist look or a bold contrast frame, our design experts will tailor your windows to suit your vision and budget.

Certified Quality & Guarantees

Every installation is completed by Certass-approved professionals, backed by:

10-year guarantee on frames/workmanship
5-year cover on glass and hardware
Fast, reliable aftercare from our local Nottingham team

Request Your Free Quote Today

See the Difference

Our installations speak for themselves transforming tired, draughty windows into stylish, efficient upgrades.

Customers Rate Us Highly

Explore recent installations from sash window upgrades to warm roof conversions and see how thoughtful design and careful fitting can transform your home.

Reviews
4.9
★ ★ ★ ★ ★
30 reviews
★ ★ ★ ★ ★
Replaced 30 year old windows!! Excellent service. Prompt and efficient. Fair price too.Left clean and tidy inside and out.
— Sharon Walker
★ ★ ★ ★ ★
Brilliant local company. Honest, reliable, quick and efficient service. Wonderful team of lads throughout whole process from enquiry to fitting. Would definitely recommend ..
— Jennifer Watson
★ ★ ★ ★ ★
Replaced patio doors. Excellent workmanship. Great couple of lads. Upvc doors are very high quality made. Would recommend 👍👍👍👍👍
— Rhbzuk
★ ★ ★ ★ ★
George and everyone we’ve dealt with at Thermaseal have been a pleasure to do business with. They worked together, as a great team, to look after our needs; from sourcing quality products, to installation, and after-sales care ....
— Colin Failes
★ ★ ★ ★ ★
Excellent service. They arrived promptly and did a wonderful and neat job of the new window. Paul was happy to assist with further information which we required. A great team, ...
— shaila gallagher
★ ★ ★ ★ ★
Thermaseal replaced two bay windows and two casement windows for us and we would highly recommend them. They were a pleasure to deal with from start to finish, very professional and friendly. They gave us the best quote out of ...
— Kate M