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Window Restoration Specialists

Secondary Glazing

Traditional Leaded Lights


Traditional Window Restoration

Tec Glass are specialist glaziers for traditional window restoration and, leaded lights. We offer independent advice that is based on over 20 years of experience and take great pride in offering high quality solutions that are tailored to individual needs.

Our services are available to both commercial and residential customers. Our typical client has an older (or heritage) property that is Grade I/II listed or in a conservation area.

Traditional leaded window in timber frame

Welcome to our Company

What our Customers say

Secondary Glazing

Traditional Restoration services

Crittall/Metal Window Restoration

We can refurbish your crittall windows and glazing, removing and restoring the rusty frames or repairing and replacing the timber sub-frames. We have a generic restoration process that is detailed on this website, just click the heading for more information.

Often the restoration process involves an element of replication and we are able to copy or create bespoke furniture, backing plates or frames as needed.

Traditional Leaded Lights

We are experts in the manufacture or refurbishment of traditional lights and one of the largest in the UK. We both supply and install and have supported many and varied projects, from prestigious Grade I & II listed properties through to film sets & media.

Stained Glass restoration

We have a stained glass design & restoration capability that enables us to support important commercial and ecclesiastical refurbishment works.

All pictures featured on this website involve Tec Glass projects and require permission to use or copy


"We cannot recommend Tec Glass highly enough - they made new leads for every single window using old glass in each one, resulting in a wonderful effect and bringing the house back to its original beauty" - Mrs Haftke, Kent

"We have no hesitation in recommending Tec Glass. They lovingly restored and repaired 23 of our Grade II listed windows. They are knowledgeable, meticulous and trustworthy, a joy to work with" - Mr and Mrs Gallup, Bucks

"From first consultation through to completion we were impressed with the service. There was no hard sell, only genuine advice from someone who clearly cared about his work and with a wealth of experience" - R & A, Mouslford

"I would just like to say it was a pleasure to have a good job done, the lads on site were very professional and a pleasure to have around. You should be proud of them, I thank you for your good work" - James Cox, Worminghall

A really important complimentary product for single glazed installations is Secondary Glazing. Whether you want to cut down on noise or drastically improve insulation secondary glazing achieves both. It should also be relatively unobtrusive and complement your existing colour scheme. We have a great deal of experience with installing into Grade I & II listed properties.

We also have a dedicated website click here.

Tec Glass are a traditional window restoration and secondary glazing specialist based in Thame, Oxon.

Whilst we can supply or refurbish any type of window, our approach is always to listen and advise on the possibilities, rather than focus on a product. We are committed to providing an excellent customer experience as well as a passion for restoring listed or traditional leaded windows or crittall and steel windows. Below is an example of the transformation we can achieve:

Grade 1 Listed House with traditional leaded lights