Business Details
Premium Windows & Doors in Chesterfield
Keystone Supplies has established itself as a leading provider of high-performance glazing solutions across the UK. Specialising in the supply and installation of bespoke timber, aluminium, and composite windows and doors, we cater to both heritage projects on listed buildings and cutting-edge passive house developments. Our partnerships with industry leaders like Velfac, Rationel, and Cortizo ensure we deliver products renowned for their durability, thermal efficiency, and aesthetic appeal. Based in Chesterfield, Derbyshire, we combine local craftsmanship with nationwide reach to serve residential and commercial clients. Our commitment to excellence spans from initial consultation to final installation, with a focus on precision, security, and sustainability.We offer made-to-measure solutions including sash windows, bi-fold doors, conservatories, and secondary glazing, all designed to enhance property value and occupant comfort. Our showroom provides a personal service experience, with extended hours available by appointment. With over two decades of experience in the glazing industry, we prioritise customer satisfaction through transparent communication and meticulous attention to detail. Our team's expertise in both traditional and contemporary design enables us to tackle projects of any complexity. From material selection to final fitting, we maintain rigorous quality control standards to ensure every project meets our exacting specifications.
Services
Timber Windows
Aluminium Doors
Conservatories
Secondary Glazing
Bi-Fold Doors
Highlights and features
- We specialise in both heritage and modern glazing projects
- Our partnerships include industry-leading brands like Velfac and Rationel
- We offer nationwide service with local Chesterfield expertise
- Our products feature dual-colour options and thermal efficiency
- We provide personal showroom consultations by appointment
What people say
Excellent price
Professional
Perfect design and style
Fantastic product quality
Impressed with quality
Services
Timber Windows
Our bespoke timber windows combine traditional craftsmanship with modern engineering. Available in sash, casement, and storm-proof designs, they feature engineered hardwood for durability and thermal efficiency. Custom RAL colour finishes and dual-colour options allow complete design flexibility while maintaining the natural warmth of wood.
Aluminium Doors
Contemporary aluminium entrance doors offer sleek aesthetics with superior security. Available in full or half-glazed options, these doors incorporate strengthened timber cores for thermal performance. Customisable profiles and finishes ensure seamless integration with both modern and traditional properties while maintaining exceptional durability.
Conservatories
Our conservatories create seamless transitions between indoor and outdoor spaces. Using high-performance glazing systems, these structures maintain comfortable temperatures year-round. Bespoke designs accommodate various property styles, with options for roof lights and integrated ventilation systems to enhance natural light and airflow.
Bi-Fold Doors
Aluminium and timber bi-fold doors maximise space and natural light. Available in multiple configurations, these doors feature low-threshold designs for accessibility. The slim frame profiles and secure locking systems ensure both aesthetic appeal and safety while creating seamless connections between rooms and gardens.
Secondary Glazing
Energy-efficient secondary glazing solutions improve thermal and acoustic insulation. Custom-made to fit existing windows, these systems reduce heat loss while preserving original architectural features. Available in timber or aluminium frames with various glass options to suit heritage and modern properties alike.
Questions
What types of windows do you supply?
We offer bespoke timber, aluminium, and composite windows in sash, casement, and storm-proof designs with custom finishes and thermal efficiency features.
Do you serve areas outside Derbyshire?
While based in Chesterfield, we provide glazing solutions nationwide across the UK for both residential and commercial properties.
Are your products energy efficient?
All our windows and doors feature high-performance glazing with U-values as low as 1.1W/m²K and optional low-E coatings for maximum thermal efficiency.
Can you match period property requirements?
Yes, we specialise in heritage projects with traditional designs that meet modern performance standards while preserving historical architectural integrity.
What's your typical delivery timeframe?
Most bespoke orders take 7-8 weeks from specification to installation, with options for urgent project scheduling where possible.
Do you have a showroom?
Our Chesterfield showroom displays full product ranges with extended hours available by appointment for personalised consultations.
