Double Glazed Windows, Doors & Conservatories
Firmfix – A reliable company you can trust for all your double glazing and conservatory needs.
Double Glazed Windows, Doors & Conservatories
Firmfix – A reliable company you can trust for all your double glazing and conservatory needs.
Premium products at affordable prices
Firmfix has been supplying and installing windows, doors and conservatories across the Three Counties since 1988.
We are passionate about what we do and are committed to the highest standards of customer care. With over 38 years’ experience, our products are expertly chosen to deliver the perfect balance of function, form and long-lasting, trouble-free performance.
A trusted local company with a friendly, no-pressure approach
We guarantee a friendly, no-pressure experience. Our expert sales team are trained to listen to your needs; they don’t earn commission and will never pressure you into a sale. Our full-time employed fitters and in-house teams ensure we meet our exacting standards on every project. Most of our work comes from existing customers and recommendations, so don’t just take our word for it; take a look at our reviews.
Quality You Can Trust
We are committed to high standards of workmanship, customer care and long-term reliability. Our accreditations and guarantees are in place to give you complete confidence when choosing Firmfix.
BSI Kitemark Certified
Our survey and installation processes meet recognised industry standards, demonstrating our commitment to quality, consistency and continual improvement.
Assure Certification
Our installations comply with current building regulations, and you will receive certification on completion, an important requirement if you sell your property.
ISO 9001 Accredited
We follow structured quality management processes to ensure consistent service, clear communication and high standards across every project.
Insurance-Backed Guarantee
As a member of QANW, your installation is protected by a 10-year insurance-backed guarantee, giving you added peace of mind.
REHAU Authorised Partner
As a REHAU Authorised Partner, we supply and install premium REHAU window and door systems, giving you trusted products backed by expert installation.
10-Year Guarantee for Peace of Mind
Many of our installations are backed by comprehensive guarantees of up to 10 years for added peace of mind, supported by our dedicated service team should any issues arise.
Our experienced installers and ongoing aftercare support help ensure a reliable, long-lasting finish. Please note that guarantee terms vary depending on the product or service provided and do not apply to replacement glass units, servicing or repair work.
What our customers say!
“Been using Firmfix for 8 years now. Last order was for 4 tripled glazed windows in a Cotswold Green. Great service. Before that they re claded the front of my Double garage in the same color.
Great service & extremely helpful in selecting the right product. Will be using them again in the near future for more windows & a door.”
Mrs Chesters
“Can’t recommend Firmfix enough they do the work and you wouldn’t even know they have been All 17 of my windows have been replaced by Firmfix and they were brilliant. Thank you Firmfix will definitely recommend you as I do to everyone that asks”
Mrs Mitchell
“We had 5 windows and a patio door replaced at a very competitive price. From start to finish we had no complaints whatsoever and would highly recommend this company and would have no hesitation should the need arise in going back to them.”
Mrs R
We’re very pleased with the prompt service and the quality of the windows. Everyone has been very polite and helpful and we would definitely use Firmfix again except that, at our age, the windows will probably outlive us!
Mr Dale