Business Details
Premium Windows & Doors in Chesterfield
Keystone Supplies, based in Chesterfield, Derbyshire, is a premier supplier of high-performance glazing systems and building materials across the UK. Specialising in timber, aluminium, and composite windows and doors, we combine traditional craftsmanship with modern innovation to deliver bespoke solutions for residential and commercial projects. Our partnerships with industry leaders like Velfac and Rationel ensure access to cutting-edge products renowned for durability, thermal efficiency, and aesthetic appeal.With expertise spanning heritage restorations to contemporary passive house designs, we prioritise precision, security, and sustainability in every installation. Our dedicated team provides nationwide service while maintaining a personal touch, offering showroom consultations and tailored project support. Committed to excellence, we ensure seamless project execution from consultation to completion, backed by a 7 - 8 week delivery period and comprehensive technical specifications.
Services
Timber Windows
Aluminium Windows
Bi-Fold Doors
Conservatories
Secondary Glazing
Roof Lights
Steel Doors
Timber Effect UPVC
Highlights and features
- We offer bespoke glazing solutions tailored to heritage and modern projects.
- Our partnerships with Velfac and Rationel ensure premium product quality.
- Nationwide service with local expertise in Derbyshire and beyond.
- Commitment to sustainability through energy-efficient and durable materials.
- Seamless project management from design to installation.
What people say
Excellent service
Quality products
Perfect design
Professional team
Changed our home
Services
Timber Windows
Timber windows combine natural aesthetics with superior insulation. Crafted from sustainably sourced hardwood, they feature durable finishes and bespoke designs to suit period and modern properties. Available in sash, casement, and flush options, these windows enhance energy efficiency while maintaining traditional charm.
Aluminium Windows
Aluminium windows offer sleek, low-maintenance solutions with slim profiles and modern appeal. Resistant to corrosion and warping, they provide long-lasting performance. Customisable in various RAL colours, these windows integrate seamlessly into contemporary architectural designs while ensuring thermal efficiency and security.
Bi-Fold Doors
Bi-fold doors create seamless indoor-outdoor transitions with expansive glass panels and minimal frames. Available in aluminium, timber, or alu-clad finishes, they maximise natural light and offer smooth operation. Ideal for modernising homes and connecting living spaces to gardens.
Conservatories
Conservatories extend living spaces with glazed structures that blend indoor comfort with outdoor views. Designed for year-round use, they feature insulated roofs and energy-efficient glazing. Tailored to complement property styles, from Victorian to contemporary, ensuring enhanced property value and functionality.
Secondary Glazing
Secondary glazing improves thermal efficiency and noise reduction in existing windows. Installed internally, it preserves original window integrity while adding insulation. Ideal for listed buildings and period homes requiring modern comfort without altering historical features.
Questions
What types of windows do you supply?
We offer timber, aluminium, composite, and UPVC windows in sash, casement, and flush designs.
Do you provide nationwide installation?
Yes, we serve clients across the UK from our Derbyshire base.
Are your products energy efficient?
All windows and doors meet high thermal efficiency standards with optional low-E glass.
What is the delivery timeframe?
Products typically deliver within 7–8 weeks of order confirmation.
Can I visit a showroom?
Our Chesterfield showroom is open Monday–Friday 9am–4pm, with Saturday appointments available.
