Business Details
38 Years
experience
Expert Window & Door Installation in Grantham
Avanti Windows has served Grantham and surrounding areas since 1988, combining decades of expertise with a commitment to quality and customer satisfaction. As a family-run business, we specialise in providing tailored solutions for both domestic and commercial clients, ensuring every project aligns with individual budgets and requirements. Our team of experienced professionals delivers energy-efficient windows, secure doors, and conservatories, all backed by industry-leading standards such as FENSA registration and a 10-year guarantee.We prioritise transparency, offering clear guidance on energy efficiency, security features, and compliance with building regulations. From initial consultation to final installation, our focus remains on delivering durable, aesthetically pleasing results that enhance property value and occupant comfort. With a reputation built on repeat business and word-of-mouth recommendations, we continue to uphold our promise of exceptional service and craftsmanship.
Services
Windows Installation
Doors Installation
Conservatories
UPVC Windows
Composite Doors
Bi-Folding Doors
Secondary Glazing
Skylights
Aluminium Products
High-Security Doors
Details
- Year established: 1988
Highlights and features
- Established in 1988 with extensive industry experience
- FENSA-registered installations for guaranteed compliance
- Energy-efficient A-rated windows and doors
- 10-year guarantee on all products and workmanship
- Full-service approach from design to installation
Associations and certifications
- FENSA
What people say
High standard
Transformed our home
Clean seal work
Delighted with end result
Fair prices
Services
Windows Installation
We install A-rated, energy-efficient windows with low-emissivity glass and multi-point locking systems. Our solutions reduce energy bills, enhance security, and comply with Secured by Design standards. Available in UPVC, aluminium, and custom designs, our windows are tailored to match property aesthetics while ensuring durability and minimal maintenance.
Doors Installation
Our high-security doors include composite, UPVC, and bi-folding options tested against extreme weather and forced entry. Features include heat-welded corners, double weather seals, and custom designs. Installation ensures compliance with insurance requirements and building regulations, improving property security and thermal efficiency.
Conservatories
We design and install conservatories with UPVC frames, offering Edwardian, Victorian, and lean-to styles. Services include skylights, guttering, and roofing options with a 10-year guarantee. Our team manages projects from planning to completion, ensuring compliance with local authority regulations and client-specific design preferences.
Secondary Glazing
Our secondary glazing adds thermal insulation and noise reduction to existing windows. Slimline aluminium frames with RAL colour options provide discreet, durable solutions. Ideal for period properties, this service improves energy efficiency without altering original window aesthetics.
Aluminium Products
We supply and install aluminium windows and doors with modern, slim profiles and robust security features. These products offer longevity, minimal maintenance, and compatibility with contemporary and traditional properties. Available in a range of colours and finishes to suit diverse architectural styles.
Questions
What services does Avanti Windows offer?
We specialise in windows, doors, conservatories, and secondary glazing installations for residential and commercial properties in Grantham and surrounding areas.
Are your installations FENSA-registered?
Yes, all our window and door installations comply with FENSA standards, ensuring building regulation compliance and quality assurance.
Do you provide guarantees?
We offer a 10-year guarantee on all products and workmanship, covering materials, installation, and performance.
Can you handle large commercial projects?
Yes, we undertake both domestic and commercial installations, providing tailored solutions to meet specific budget and design requirements.
How long does installation take?
Timelines vary by project size, but we prioritise efficient completion while maintaining high standards of craftsmanship and safety.
Do you assist with building regulations?
Yes, we manage all necessary compliance requirements, including planning permissions and local authority approvals for conservatories and extensions.
