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

KEYSTONE
Windows & Doors

Transform your home with bespoke, high performance window and door solutions supplied and installed by Keystone. From energy efficient triple glazing to architectural aluminium and handcrafted timber, we deliver market leading security, acoustic insulation, and thermal performance tailored to your exact property specifications.
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Evolution's Timber Effect Windows & Doors

Authentically replicating the classic look of traditional wooden windows without the constant need for maintenance. Evolution windows provide hight-performance efficiency and security while preserving a historical aesthetic.
Find out about evolution

VELFAC Composite Windows & Doors

Experience world class Scandinavian design with VELFAC composite glazing systems. Featuring ultra slim 54mm profiles, low maintenance aluminium exteriors, and warm internal timber frames, VELFAC brings unrivaled natural light, uniform sightlines, and modern thermal efficiency to both contemporary builds and traditional home refurbishments.
Learn more about Velfac

CORTIZO's Aluminium Windows & Doors

Maximize your living space with Cortizo’s industry leading architectural aluminium doors and windows. Engineered with minimal sightlines, thermal break technology, and PAS 24 certified multi-point locking arrays. Cortizo systems create seamless transitions between indoor and outdoor environments without compromising on structural integrity or thermal comfort.
Helpful information about Cortizo

ALUCO Steel-Look Windows & Doors

The definitive industrial aesthetic combined with modern aluminium performance.
ALUCO systems maximize natural light and offer the iconic, minimalist appearance of steel, creating sleek, elegant spaces.
Learn more about ALUCO
Cortizo Logo Velfac Logo Cortizo Logo Velfac Logo Cortizo Logo Velfac Logo Cortizo Logo Velfac Logo Cortizo Logo Velfac Logo Cortizo Logo Velfac Logo
Featured Windows and Doors

Explore Our Core Glazing Collections

Discover our handpicked selection of high performance window and door systems, curated to showcase the versatility, efficiency, and premium quality our glazing range has to offer.

Timber Windows

Traditional sash and casement windows crafted from durable timber, offering authentic period charm with a modern effortless operation.
Velfac's Ribo range installed in a bedroom wall with a custom shape.

VELFAC Ribo Windows

Versatile composite windows combining classic rebated frame aesthetics with modern thermal insulation and weather resistance.

Timber Effect UPVC Windows

Premium flush sash UPVC frames featuring realistic woodgrain foils, delivering timber aesthetics with zero ongoing maintenance.

Aluminium Windows

Ultra slim, architectural aluminium frames offering panoramic glass expanses, robust structural strength, and contemporary styling.

Steel-look Windows

Slim, strong, and satisfying. Aluco's steel-look brings a modern, streamlined finish to your homes exterior all year around.
Frame your home with beautifully crafted windows

Triple Glazed Windows 

All of our products are compatible with the latest triple glazing systems, allowing you to add a third pane of glass and an extra insulating gas cavity, lowering U-values significantly, cutting heating bills, eliminating cold spots, and reducing external noise pollution.

Achieve ultimate thermal performance and home comfort with our efficient triple glazed windows. Designed to lock heat inside during winter and prevent overheating in summer, triple glazing excels in thermal insulation while also providing superior noise dampening and high security. Triple glazing is the ultimate longterm investment for low energy and Passivhaus standard homes.
See our triple glazed windows
A long white sliding door from VELFAC's V200 collection
Your Door is The Gateway to Your Home

Timber, Aluminium & Composite Doors

Front doors, sliding doors, bi-fold doors, internal doors, steel doors, and much more—Keystone offers a comprehensive collection of bespoke entry and patio systems built to elevate your entire property. Whether you require the ultra-slim panoramic views of aluminium sliding doors, the robust security of high-density composite entrance doors, or the timeless elegance of solid timber, every door is custom-engineered to deliver effortless operation, high thermal resistance, and maximum home security.
View all doors

Have an exciting project and need advice?

Having an extensive background in construction, we understand how stressful these projects can be. Between styles, efficiency and legislation, getting new windows can be a headache.
 If you need support with our range of windows, please get in touch with us today to find out which windows will work for you!
Give us a call for free
New timber windows from Keystone in an old english cottage
Who Are We?

Created by Nature, Perfected by Craftsmen

Founded in 2013 by experienced builders, Keystone Specialist Glazing Systems was born out of a passion for hight quality joinery and real world construction expertise. Having started on site with stonework, roofing, and barn conversions, we know exactly what it takes to bring demanding architectural projects to life.

Today, based out of our Chesterfield showroom, we supply and install market leading timber, aluminium, and composite windows and doors from trusted brands like VELFAC, Rationel, and Cortizo. Whether you are working on a period restoration, a self-build extension, or a modern Passive House, trust a team that knows glazing from the ground up.
Learn more about our team
Visit Our Showroom

Opening Times

Monday - Friday
09:00 - 16:00
Saturday
By Appointment Only
Sunday
Closed
Please note that we are also able to open later to offer you a personal, one to one service upon request. Please give us a call to arrange a time that fits you. Our showrooms are situated at Storforth Lane Trading Estate in Hasland, Chesterfield.
Client Reviews

What our Customers Say About our Products

Simple, effective service…. very professional, arrived on time, excellent price
Libby, Manchester
We were overly impressed with the quality and design of the Keystone-Supplies product range, every detail was perfectly finished, it really has changed our home
Linda, Leicestershire
I would strongly recommend these products to anyone, from the windows to the wooden flooring every minor detail is seen too with an attentive eye – perfect design and style
Richard, Derbyshire
Don't Just Look Good Outside...

... Look Good Inside Too!

Extend your home’s architectural design beyond your exterior facade with Keystone’s premium internal doors. From sleek steel-framed glazed partitions that flood interior rooms with natural light to solid timber and acoustic internal doors, our interior range offers exceptional soundproofing, privacy, and tailored finishes designed to complement every interior space.

Send a Message

Email us any time of day and we'll get back to you as soon as we can.
created@keystone-supplies.co.uk

Give Us a Call

we're always available to call or text during our opening hours
01246201523

Visit Our Show Room

Our website is great but our showroom is even better. Get hands on with our windows and doors.
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