uPVC windows in Nottingham

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A-rated efficiency. Lasting quality. Local expertise you can trust.

At Thermaseal, we’ve been helping homeowners across Nottinghamshire transform their homes with modern, energy-efficient uPVC windows for over 16 years. Our family-run team combines honest advice, professional installation, and top-quality products — all without the pushy sales approach.

Why choose our uPVC Windows

Our uPVC windows are designed to improve comfort, security, and style in your home — while keeping energy bills low. Each window is A-rated for efficiency and built to last using top-of-the-range Kubu bi-directional locking systems for maximum security.

You’ll enjoy a warmer, quieter home that feels modern, secure, and low-maintenance — all at an affordable price.

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Features & Benefits

The list of features and benefits

  •  A-rated energy performance with 28mm Planitherm Argon-filled glazing.

  • Kubu-ready bi-directional locks for enhanced safety and smart home monitoring.

  • Low-maintenance frames that won’t warp, rot, or fade.

  • Multiple styles and colours – from classic white to modern greys and woodgrain finishes.

  • Trickle vents and night vent options for fresh air and comfort.

  • Internally beaded for added security.

A Style for Every Home

Whether you live in a modern property or a period home, our range of uPVC windows includes everything from casement and tilt & turn designs to sash and flush casement options — all custom-made to fit your space perfectly.

Not sure which is right for you? Our friendly local team is happy to guide you through styles, colours, and glazing options to suit your home and budget.

Peace of Mind Guaranteed

As Certass-registered installers, every Thermaseal window installation comes with:

5 years on glass and hardware
10-year insurance-backed guarantee on frames and workmanship
Professional aftercare and quick response times from our local support team

Before & After Results You’ll Love

Our installations speak for themselves transforming tired, draughty windows into stylish, efficient upgrades. See the difference in our before & after gallery or ask about projects completed in your area.

See the Difference

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

See the Difference

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

Request Your Free Quote Today

Request Your Free Quote Today

Need Some Inspiration?

Have a look at some of the previous projects that we have done.

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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.

beaner-image Rating
4.5
140 reviews

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01 Oct, 2024

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01 Oct, 2024

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01 Oct, 2024

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01 Oct, 2024

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01 Oct, 2024

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