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Beautiful Spaces. Built For Year-Round Comfort.

Whether you’re dreaming of a sun-filled conservatory or a stylish orangery, Thermaseal can design, build, and install the perfect addition to your home. Our family-run team has over 16 years of experience creating bespoke living spaces that look stunning and perform brilliantly — every day of the year.

Why Choose Thermaseal

We take care of everything — from design and planning to installation and aftercare. Every conservatory and orangery we build is custom-designed for your home, built to the highest standards, and fitted with energy-efficient materials that keep your space comfortable in every season.

Conservatory-roof

Conservatories

Bright, Open, And Versatile

Modern conservatories are so much more than glass extensions — they’re bright, insulated rooms that can be enjoyed all year.

Features Include:

  • A-rated insulated glazing for warmth and efficiency

  • Solid or hybrid roof options (including tiled warm roofs)

  • Custom styles: Victorian, Edwardian, Lean-to, Gable-end & more

  • Multiple colour and finish options

  • Adds usable space and value to your home

Orangeries

Elegant, stylish, and built for living

If you want the light of a conservatory with the solid feel of an extension, an orangery offers the best of both worlds.

Features Include:

  • Stunning brickwork and lantern-style roofs

  • Year-round insulation for comfortable living

  • Tailored design, layout, and finish options

  • Adds luxury, light, and character to any property

Complete Design & Build Service

From the first consultation to the final touches, we handle every detail — design, planning, construction, glazing, roofing, electrics, and finishing. We also offer 3D visual designs so you can see exactly how your new space will look before we begin.

Quality & Guarantees You Can Trust

Certass-registered installation
10-year insurance-backed guarantee on frames and workmanship
5 years on glass and hardware
Full aftercare and maintenance support
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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.

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