Windows, Doors & Conservatories in Grantham and Surrounding Areas!

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window Installation
window Installation

FENSA Registered 

Established Since 1988

 

GGFI Insurance Back Guarantee

About Us

Avanti Windows has been established in Grantham since 1988. We are a small family-run company with a fantastic team with a plethora of knowledge within our field. We take on domestic work as well as large commercial installations. Dedicated to ensuring that you stay within your budget and requirements, we offer cost-effective solutions when you need them. Call us for a quotation today.

window Installation

Buyers Guide

Our Grantham team have the best window installation tips, including:

Security Avanti Windows offers robust multi-point locking mechanisms with exceptional security. All our installations fall under the ‘Secured by Design’ police initiative.

Energy Efficiency Our high-grade low-emissivity windows keep your home cool in summer and warm in winter. All our installations have ‘A’ rated argon-filled glass. The UPVC profile we install is a market leader across the board and Energy efficiency is one of our priorities.

Ventilation Current building regulations require that new windows must have trickle vents. These help with ventilation and reduce dampness. We can help guide you through these regulations and help you keep up with current standards.

Our Services

We understand that maintaining the look of your property while adding security is important. Keep your loved ones safe and cut down on your energy bills by letting our professionals transform your home with energy-efficient high security windows and doors. 

At Avanti Windows, we pride ourselves on being ‘Conservatory Experts’. We can guide you through with a full service from start to finish so you won’t have to worry about dealing with different trades. We can organise our own bricklayers, electricians and plasterers to ensure the project goes smoothly from start to finish.

That’s why we’re Grantham’s top choice for professional window and door installation!

For a FREE Quote!

Evie English
Evie English
Tony and the team were very professional throughout the whole process. The fitters had to install all new windows and doors and have completed to a high standard. They have been very accommodating with my timescales and would highly recommend. Thank you!
Debbie Norton
Debbie Norton
A big thank you to Richard Tony and the team. Amazing service thoughout totally transformed our home! From the giles-norton family
Draylynn
Draylynn
Our landlord got our old/rotten windows replaced by Avanti (Due to COVID there was a long wait for em). Friendly bunch, such a good job, clean seal work, no drafts, fitted well, cleaned up after themselves (indoor and out). Absolute 'massive' difference it's made in temperature and noise. Smashin' job, thanks Gaz and co'.
Dawn Mantle
Dawn Mantle
Unfortunateley we had a bit of a wait to get our conservatory roof replaced due to the Covid 19 Pandemic. But Avanti have now managed to come and get the job done. The team were brilliant on the day, courteous, professional and worked safely within the Pandemic guidelines. My husband and I are delighted with the end result, it looks amazing. Thank You Avanti. Highly reccommended!
Amanda Godber
Amanda Godber
Helpful professional service, done with an open and friendly approach and fair prices.
Robert Edwards
Robert Edwards
Very high quality doors, no nonsense quote provided, no pushy sales process. Excellent fitting service by professional team, I would highly recommend this company to anyone.
John Sheppard
John Sheppard
Fantastic company. Conscientious fitters, work completed to a high standard and the service from start to finish was excellent. Will be recommending to friends and family.