UPVC Windows, UPVC Doors, Composite Doors, Folding Doors and Conservatories

GRP Designs have been manufacturing and installing Aluminium and UPVC Windows, UPVC Doors, Composite Doors , French Doors, Patio Doors, Bi-fold Doors, and Conservatories since 1988. We are also suppliers and installers of fascia, soffit and guttering.


Over 80% of our work comes from recommendations, and we believe that our replacement windows and replacement doors are amongst the finest in the region, whilst also offering the best value for money.

5 Reasons to choose GRP Designs
  • Peace of Mind - We offer a comprehensive 10 year guarantee on all our double glazing windows, doors and conservatory installations
  • Security - All of our Aluminium and UPVC windows and doors are fitted with multipoint locking as standard
  • Quality Products - All UPVC windows are fully welded, using one of the leading profile systems on the market, and with all our Aluminium and UPVC products manufactured on our own premises we can ensure that our windows and doors are amongst the finest in the region
  • Quality Installations - All work is carried out by our own in-house craftsmen, and with specialists in building, carpentry, double glazing window fitting, conservatory roofs & roofline products, we can match the right people to the right job
  • Value for Money - All of the above from a local double glazing company committed to providing value for money
Aluminium Windows
Serving People since 1988

Originally we started our double glazing company in Desborough, Northants, before moving premises to Kettering, Northamptonshire in the 1990's. Throughout this time we have built a reputation for the quality of our double glazing window and conservatory installations and the quality of products that we supply and manufacture.

UPVC Windows

We currently operate across the East Midlands, with the majority of our double glazing window and conservatory installations in Northamptonshire and surrounding counties, covering towns such as Kettering, Rothwell, Wellingborough, Northampton, Thrapston, Raunds, Daventry, Market Harborough, Rushden, Oundle, Corby, Bedford and Leicester.

We are also UPVC window suppliers further a field, supplying our UVPC windows doors across the UK.

Useful Links:



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Please call us on
01536 312939
for further information
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GRP Designs Ltd, Britannia Road, Kettering, Northants. NN16 9RX.
We are listed on the FreeIndex.co.uk Double Glazing directory