Double glazing installations in Northampton and Milton Keynes to Leicester and Coventry

Operating out of Wellingborough since 1979 as a leading home improvement company, T&K has proudly served Northamptonshire, Buckinghamshire, Leicestershire, Bedfordshire and surrounding areas for over 40 years. We’re accredited by Which? and have been awarded their prestigious Certificate of Distinction for 2 years running, whilst 98% of our customers would recommend us! We’ve designed, manufactured and installed replacement windows, doors, conservatories and much more for over 60,000 homes during this time, and are a proud member of Made in Great Britain. All of our home improvement products can be viewed in our Wellingborough showroom. Founded by Kevin Johnson, the bespoke home improvement company remains proudly run by the Johnson family today, retaining a family ethos that ensures for an astounding and personal service.

Whether you’re looking for replacement windows in Northampton, double glazing in Wellingborough or conservatories in Aylesbury from a local window company, we have the expert experience and local Northamptonshire knowledge to serve you with an excellent installation or repair, including conservatory refurbishments. If you’re looking for a conservatory showroom in the Northamptonshire area, take a visit to our Wellingborough double glazing showroom to see our range of attractive home-improvements for yourself, including verandas for Oxfordshire, Aylesbury windows and double glazing in Northampton!

Voted Which? top trusted trader Made in Britain

40 years as a local window installer in Northampton and beyond


Established 1979

With over 40 years’ home improvement trading experience, T&K has built up an unparalleled level of product, security and installation expertise, offering glass in Northampton and double glazing in Rugby and Milton Keynes.

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Double Glazing Finance

With buy now pay later and interest free credit finance options available, including an interest-free conservatory and excellent double glazing finance, improving your Northamptonshire home couldn’t be easier with T&K, who are authorised and regulated by the Financial Conduct Authority. Click Here for double glazing finance options.


Fully accredited

T&K is now fully accredited by all relevant regulatory bodies, including Secured by Design. and DGCOS. We've also been awarded top Trusted Trader status as a member of Which?'s Trusted Traders scheme.

Shield check

10 year guarantee

Any home improvement installation work performed by us comes with a 10 year guarantee, as standard.


Servicing & aftercare

T&K provides a devoted aftercare service for our home improvement installations. Once your double glazing installation is complete, our expert team will remain on hand to ensure it keeps functioning as it should. We've also got a range of great guides for homeowners looking to keep their products at their optimal performance.


Highly recommended

We’ve built up quite a reputation as a leading home improvement company in Northamptonshire since we started trading with double glazing in Wellingborough, resulting in many of our customers recommending our home improvement installations to others.

Multi award-winning company

Over the years, we can proudly say that what we've been commemorated for various outstanding aspects of our business, as evidenced by the number of awards that we've achieved. Check out the range of awards wins we have behind us on our awards page.

G12 winner installer of the year
G14 winner customer care initiative of the year
G15 winner fabricator of the year
G16 winner new product of the year
Top 3 window fitters in Northampton 2019
C&O awards highly commended 2019
Wellingborough business awards 2019 winner


Every uPVC product we install at T&K has been exclusively fabricated by our sister company Emplas, who have over 35 years of experience in uPVC manufacture. This means we have direct influence on quality control and we’re able to offer ultra-quick lead times on our uPVC products.

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Fully accredited company

With full accreditation from the appropriate regulating bodies, you can feel assured of the quality that’s on offer.

Which? Trusted Trader
Secured by Design

Serving homeowners across Northamptonshire

During our tenure as traders, we’ve provided bespoke home improvement solutions across the Northamptonshire area and beyond. This includes areas in counties like Oxfordshire and Buckinghamshire. We've installed home improvements in places such as Corby, Northampton, Bedford, Kettering, Milton Keynes, Cambridge, Aylesbury, Oxford, Rugby, Bicester, Luton, Market Harborough & Banbury.

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