Business Details
28 Years
experience
Your Trusted Window & Door Specialists in Horsham
Established in 1998, Window Mart has grown into a trusted name in the fenestration industry, serving homeowners and commercial clients across West Sussex and the South East. Founded by Martyn Barker, our Managing Director with over 35 years of industry expertise, we combine traditional craftsmanship with modern innovation to deliver premium windows, doors, conservatories, and garden rooms. Our commitment to quality is evident in our in-house team of skilled tradespeople, who manage every project from initial consultation to completion, ensuring meticulous attention to detail and exceptional customer service. With a purpose-built showroom near Horsham, we offer a comprehensive range of energy-efficient solutions, including A-rated PVCu windows, composite doors, and thermally efficient conservatories, all backed by our Price Match Guarantee.As members of the FairTrades Association, we adhere to rigorous standards of professionalism and ethical practice, providing transparent pricing, free consultations, and a 10-year guarantee on materials and workmanship. Our dedication to customer satisfaction is reflected in testimonials praising our clean, efficient installations and the transformative impact of our products on home comfort and value.
Services
PVCu Windows
Composite Doors
Conservatories
Garden Rooms
Commercial Windows
Details
- Year established: 1998
Highlights and features
- We offer a Price Match Guarantee on like-for-like quotations
- Our All Seasons Living range combines conservatory aesthetics with extension efficiency
- We provide over 50 front door options starting from 645
- We deliver free, no-obligation quotations with detailed specifications
- Our team maintains immaculate standards during installations
Associations and certifications
- FairTrades Association
What people say
Friendly and clean
Professional way
Excellent team
Job looks smashing
Neighbour complimented
Services
PVCu Windows
Our A-rated PVCu windows combine security and energy efficiency with 70mm deep profiles designed for UK architecture. Featuring Homeguard locks and low-E glass with argon-filled units, they reduce heat loss by 25% while enhancing property value. The multi-chambered frames and warm edge spacers deliver 70% less condensation, creating healthier living environments.
Composite Doors
Available in over 50 styles, our composite doors merge traditional aesthetics with modern security. Reinforced with steel sections and featuring 3D-adjustable hinges, they offer superior thermal efficiency and soundproofing. The patented Homeguard locking system meets British Standards, while woodgrain and coloured finishes ensure perfect property matching.
Conservatories
From Victorian to Gable designs, our conservatories use thermally efficient glazing and tiled roofs for year-round usability. The All Seasons Living range combines conservatory light with extension insulation, achieving U-values as low as 0.18W/mK. Customizable with colored glass and external cornices, they add valuable living space.
Garden Rooms
Custom-built garden rooms feature Pod foundations, 80mm Celotex insulation, and A-rated windows for permanent use. Designed as home offices or studios, they include LED lighting, underfloor heating options, and decking. The hup! Building System enables five times faster construction with minimal disruption.
Commercial Windows
Specialist commercial window solutions for schools, apartments, and offices across Sussex and London. Our FENSA-registered team delivers large-scale projects with coordinated groundwork and brickwork services. Products meet Part L building regulations, offering 25% energy savings for commercial properties.
People
Martyn Barker
Managing Director
With 35 years of industry experience, Martyn Barker established Window Mart in 1998, combining traditional craftsmanship with modern innovation. He oversees operations at the Horsham showroom, ensuring all projects maintain the highest standards of quality and customer service.
Questions
What window energy ratings do you offer?
All our windows achieve A ratings from the British Fenestration Rating Council, with U-values as low as 0.8W/m²K for maximum thermal efficiency.
Do you provide guarantees on installations?
We offer a 10-year guarantee on materials and workmanship, plus lifetime anti-discolouration warranties on white fascia boards.
Can I finance my home improvements?
Yes, through Phoenix Financial Consultants Limited, we provide finance options subject to status and credit checks.
How long does a conservatory installation take?
Most conservatories are completed within 4-6 weeks, including groundwork, framework, and internal finishing touches.
Are planning permissions required for garden rooms?
Garden rooms typically don't require planning permission when meeting permitted development criteria for outbuildings.
What security features do your doors include?
Our composite doors feature Homeguard locking systems with anti-snap cylinders, reinforced steel frames, and 3D-adjustable hinges.
Reviews (6)
Natalie Bridgman
Dec 19, 2021
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Martyn and his team installed a 'Live-in Orangery' for us to give my husband somewhere to work in peace. The quality of the work has been excellent and we love the finished build, feels like it's always been part of the house. Martyn was helpful from start to finish, listening to our requirements and amending designs and quotes when necessary, and then booking us in for a date and keeping in contact should there be any delays,and providing a schedule of work. All of the Windowmart team, were polite, friendly, and very tidy. Would, and have recommended Martyn and his team, and would definately use
Nigel Harris
Dec 12, 2021
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After a consultation with the owner, Martyn,we received a detailed design and quotation for a Double Hipped Edwardian conservatory measuring 5 meters by 4 meters. A payment plan and schedule of works was sent to us. We found the staff, Mark and Scott were punctual, hard working and curteous. The quality of workmanship and material used resulted in an excellent build. We are very happy with the the conservatory and would certainly recommend Window Mart.
Richard Gear
Dec 07, 2021
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Had quite a bit done at different times, oldest first: side door, bi-folds between connie and house, front door and finally a hard roof connie to replace existing Anglian connie, including electrics and flush lighting in the ceiling. Very happy with all of it, price, time and scope of work, neatness. Would definitely use again.
Adrian Lawrence
Dec 06, 2021
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Excellent from the start to the finish of our extension. All the builders turned up when they should. Worked diligently and accurately. First class all round. There were a couple of hiccups on the way, all resolved quickly. To be frank it was quite stress less.
Sean Wilkinson
Dec 05, 2021
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Martyn & his team built an orangery onto the side of our house and we were very pleased with the work they did. It has added a great new living space to our home. Their work was of a high standard and their communication thought the project was great and the price agreed was the price paid, no hidden costs. Would definitely recommend them to anyone looking to take on a similar project.
Tom Hall
Nov 22, 2021
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We had replacement windows fitted by Martyn and his team at the front of our house. Martyn was very friendly and informative during our consultations providing a competitive and detailed estimate. the windows were fitted over two days by two very professional and polite fitters. No fuss, no mess. Would thoroughly recommend Window Mart.
