Keystone Supplies, Unit 17 Storforth Lane Trading Estate, Hasland, Chesterfield,
Derbyshire, United Kingdom S41 0QQ
01246 201523

All Our Quality Aluminium, Timber & Composite Windows

Discover high performing glazing tailored to your home. We supply and install an elite range of sleek modern aluminium, classic timber, and low-maintenance composite window systems throughout Chesterfield, Sheffield, and Rotherham.
Get Inspired With Our Window Gallery
Open The Window To Timeless Elegance

Bespoke Timber Windows

Bring natural beauty and superior insulation into your home with our range of expertly crafted timber windows.
Crafted from sustainably sourced wood, our custom timber windows are engineered to resist warping, eliminate drafts, and offer decades of thermal efficiency. Perfect for heritage homes and luxury modern designs alike.
Explore Our Timber Windows
Velfac Classic Windows
Composite Windows Bringing The Best Of Both Worlds

Velfac's Best Windows Yet

Experience the ultimate fusion of materials with Velfac's composite windows. Natural warmth of internal wood paired with tough, weather resistant aluminium frames. Velfac delivers iconic Scandinavian designs that maximise natural light while offering world class acoustic and thermal insulation.
Explore Velfac Windows
Exceptionally Easy Maintenance

Evolution Timber Alternative Windows

We are working with the very best to bring you indistinguishable timber effect UPVC windows. These quality ranges of windows supply you with almost unlimited choice and full control over your home's look and feel, all while maintaining the warm appeal of wood.
See More On Evolution Windows
World Class Premium Windows

Industry Leading Aluminium Windows By Cortizo

Cortizo provides minimalist luxury with ultra slim profiles and expansive glass surfaces. These aluminium windows offer maximum structural strength with advanced thermal technology, allowing you to flood your living space with natural light without sacrificing energy efficiency.
Discover Cortizo Windows
Iconic Industrial Heritage & Modern Performance

ALUCO Steel-look Aluminium Windows

Capture the bold, architectural character of traditional steel glazing with the superior efficiency and low maintenance of modern aluminium. ALUCO steel look windows feature ultra slim sightlines, bespoke glazing bar matrices, and advanced thermal break technology, making them the perfect solution for character properties, barn conversions, and modern light filled extensions.
Find Your Steel-look Windows
Looking For Scandinavian Excellence?

Looking For Rationel?

Rationel no longer supplies windows under this name. Instead their active line of products have been merged with Velfac. Click the button below to see All Rationel Windows
View Rationel Windows

Gallery of Windows

Need some inspiration for your current project?
We've supplied and fitted every sort of window, see our work and get some ideas from the gallery below.
New timber windows from Keystone in an old english cottage
Company No: 08821594
Vat No:189597232
Created@keystone-supplies.co.uk
Keystone Supplies
Unit 17
Storforth Lane Trading Estate
Hasland
Chesterfield
Derbyshire
United Kingdom
S41 0QQ