Windows

Grantham’s Dedicated Windows Company

Expertise and Service Are at Your Fingertips

At Avanti Windows Ltd in Grantham, we’ve been in the business of windows for many years. Offering a large selection of styles, double glazing and secondary glazing options, we consistently provide fast installation at an affordable price, and with impeccable service. That’s why most of our business comes from repeat customers or word of mouth. Our windows are designed to keep your home warm, quiet and secure whilst being virtually maintenance-free. All our windows are ‘A’ rated as standard and use the very latest glass technology.

The full range of options

With our PVC casement windows, a full range of bays, bows, arches and circular windows are available with endless glass designs to match or renew the look of your home. Our sash windows compliment every style of property, giving a classic look with hassle-free modern technology. All our coloured windows are available in the full artisan colours

Our team understands the importance of your budget, and you are assured we will work to stay within this, advising you in advance of any changes.

Secondary glazing

Secondary glazing adds another inside window in addition to your existing external ones. These units improve thermal performance, and security and reduce noise. Although most secondary frames are white, we are able to offer any RAL colour.

Our secondary windows are made with a strong slimline aluminium framework so frames are invisible from the outside.

Excellent service

Avanti Windows Ltd is a service-oriented company. This means that all of our Grantham-based team is trained in customer service, so you will receive the high level of service that you expect.

All of our work is carried out in a professional, friendly manner. You can be sure the services we provide for your windows and doors will be done to the highest standards and with the utmost care.

Our team understands the importance of your budget, and you are assured we will work to stay within this, advising you in advance of any changes.

For a FREE Quote!

Call: 01476 579058

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

A big thank you to Richard Tony and the team. Amazing service thoughout totally transformed our home! From the giles-norton family

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

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

Helpful professional service, done with an open and friendly approach and fair prices.

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

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.