Business Details
Your Trusted Partner for Windows & Doors in Sheffield
NuLife Window Company has been a trusted name in Sheffield's window and door industry since the 1970s, establishing itself as the largest independent window company in Yorkshire. Under the leadership of Managing Director Mike Knott, our family-owned business combines decades of expertise with a commitment to quality, security, and aesthetic excellence. Our team includes a qualified EPC Assessor, ensuring our products meet modern energy efficiency standards while maintaining traditional craftsmanship. We specialise in bespoke A-rated windows, high-security doors, and innovative glass solutions tailored to individual customer needs. With a showroom showcasing our extensive range, we provide a personalised service where every order is manufactured to precise specifications.Our policy of offering exceptional value for money has made us the preferred choice for homeowners seeking durable, energy-efficient replacements. We pride ourselves on using advanced PVCu materials that merge timeless design with contemporary performance, enhancing both residential and commercial properties. Our 10-year product guarantees reflect our confidence in the durability and functionality of our offerings. As a locally rooted business, we understand the unique requirements of Sheffield and surrounding areas, delivering solutions that combine practicality with visual appeal. Our dedication to customer satisfaction remains unwavering, ensuring every project meets the highest standards of quality and service.
Services
Composite Doors
uPVC Doors
Windows
Vertical Sliders
Aluminium Bi-folds
Glass Solutions
Highlights and features
- Family-owned since the 1970s with local market expertise
- Qualified EPC Assessor on staff for energy compliance
- 10-year product guarantees on all uPVC door systems
- Bespoke manufacturing to precise individual requirements
- A-rated windows for superior energy efficiency standards
Services
Composite Doors
Our composite doors combine reinforced security frames with weather-resistant outer skins for maximum durability. Available in multiple designs, they enhance property value while maintaining thermal efficiency. Each door undergoes rigorous testing to meet British security standards, featuring multi-point locking systems and reinforced hinges for complete peace of mind.
uPVC Doors
Modern uPVC doors offer cost-effective solutions without compromising quality. Our range includes panel, French, and stable doors with optional glazing features. The low-maintenance material resists warping and fading, while advanced locking mechanisms ensure household safety. All installations include a 10-year product guarantee for complete customer confidence.
Vertical Sliders
Vertical slider windows merge traditional aesthetics with modern PVCu technology. Their dual-slide and tilt functionality allows safe ventilation while maintaining security. Each unit achieves WER A-Rating for energy efficiency, featuring reinforced steel chambers for structural integrity and noise reduction in busy urban environments.
Aluminium Bi-folds
High-performance aluminium bi-fold doors create seamless transitions between indoor and outdoor spaces. Their slim profiles maximise natural light while providing exceptional thermal insulation. Suitable for extensions and conservatories, these doors incorporate multi-point locking systems and weather seals to meet stringent security and durability requirements.
Glass Solutions
We supply double and triple-glazed units for residential and commercial properties. Our insulated glass packages reduce heat loss by up to 70%, lowering energy bills while minimising condensation. Available with decorative finishes and safety laminates, each unit is custom-manufactured to fit existing window frames precisely.
People
Mike Knott
Managing Director
With over 40 years in the window industry, Mike Knott leads NuLife as Managing Director. His family's ownership since the 1970s ensures continuity of quality standards. A qualified EPC Assessor, he specialises in energy-efficient home improvements while maintaining traditional craftsmanship values.
Questions
What window and door materials do you offer?
We provide uPVC, composite, and aluminium options, each with distinct benefits for security, thermal efficiency, and aesthetic appeal.
Do your products come with guarantees?
All uPVC door frames include a 10-year product guarantee, with window units carrying a 10-year performance warranty.
Can you help with energy-efficient replacements?
Our A-rated windows and doors meet current energy standards, featuring qualified EPC Assessor guidance for optimal thermal performance.
How do I get a quote?
Request a free quote through our website or visit our Sheffield showroom for personalised consultations with our experts.
Are your installations suitable for listed buildings?
We offer heritage-style designs that comply with conservation area requirements while maintaining modern performance standards.
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Reviews (6)
B. Dakin
Aug 30, 2021
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Had windows fitted which were fitted well, had a message on my phone within an hour of fitter finishing asking for me to pay, then three more during the course of the day. Funny how when I call them and leave a message and ask for someone to call me about an issue with two of the windows, their phones don't seem to be working............
Christian Jones
Mar 10, 2021
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Positive:Professionalism,Punctuality,Quality,Responsiveness,Value
Just had a new traditional black door fitted & new glass in my bay window & The young gentleman were very professional so thanks & will definitely use them again
Services:Window repair,Door installation
Just had a new traditional black door fitted & new glass in my bay window & The young gentleman were very professional so thanks & will definitely use them again
Services:Window repair,Door installation
Michael Harrison
Mar 08, 2021
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Tom arrived at time arranged with us and got straight on with work, did a really good job fitting new front and back door, cleaned up after job finished. Very friendly and polite. Thanks Tom. Would highly recommend. also big thanks to Julie for calling at our house in these difficult times. Very competitive prices. Both very pleased
Tracy Roberts
Jan 31, 2021
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Positive:Professionalism,Punctuality,Quality,Responsiveness,Value
Fantastic service from start to finish,totally transformed the house with lovely bay window&stylish doors great value for the money.The guy's worked to a high standard very polite&respectful of our home keeping us informed throughout the process,would highly recommend this company to friends&family thankyou
Services:Door installation,Window installation
Fantastic service from start to finish,totally transformed the house with lovely bay window&stylish doors great value for the money.The guy's worked to a high standard very polite&respectful of our home keeping us informed throughout the process,would highly recommend this company to friends&family thankyou
Services:Door installation,Window installation
Rob Watson
Nov 24, 2019
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We have just had a new front door fitted to our house and the product and workmanship was first class .A big thank you to all the staff who were involved for their experience , knowledge and friendly attitude.
Jonathan Legon
Jul 02, 2019
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What a fantastic company! When we first visited the showroom we hit it off with them straight away. They were very friendly, not pushy at all but also very professional. Everything happened as they said it would and the fitter, Martin, was a true gent, and a credit to the company.The price for the doors was excellent too, we can't recommend them enough!
