Frequently Asked Questions (FAQs)
Everything You Need To Know About Our Products And Services.
At Thermaseal, we understand that replacing windows, doors, or building a conservatory is a big decision. That’s why we’ve answered some of the most common questions our customers ask — to give you complete confidence before you choose us.
Yes. Our A-rated double glazing helps minimise condensation by improving thermal performance and maintaining a more consistent indoor temperature. Proper ventilation also helps, which is why our windows include trickle vents as standard.
All Thermaseal windows and doors are A-rated for energy efficiency, helping you keep your home warmer while reducing your energy bills.
We use high-quality uPVC and aluminium profiles, combined with Planitherm Argon-filled glazing and Kubu locking systems. Each product meets BS standards and is internally beaded for extra security.
Every Thermaseal installation comes with a 10-year insurance-backed guarantee on frames and workmanship, and 5 years on glass and hardware. All our work is Certass-registered for full compliance and peace of mind.
Yes. Thermaseal is fully Certass-accredited, meaning all installations meet strict quality and safety standards.
Our certification also ensures your guarantees are insurance-backed.
Yes, absolutely. We remove and responsibly dispose of all old frames, glass, and waste materials — leaving your home clean and tidy after every installation.
Yes. We provide full aftercare support for all our installations. Whether you need an adjustment, a repair, or some maintenance advice, our team will help quickly — usually within 24 hours.
Most quotes are provided within 24–48 hours of your enquiry. For larger projects, such as conservatories or orangeries, we may arrange a free home visit and design consultation.
We serve homeowners across Nottingham, Mansfield, Derby, and surrounding Nottinghamshire areas — offering the same friendly, reliable service wherever you are in the region.
Request Your Free Quote Today
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