Welcome to Abacus Windows and Conservatories 

Here at Abacus Windows and Conservatories we do not want you to be left out in the cold with poor quality windows. We offer you a solution to your replacement window needs by supplying and installing the highest quality products.

Abacus Windows and Conservatories specialises in replacement window services for conservatories and also offers replacement services for all other windows and doors, fascia boards, soffit boards and guttering.

Abacus Windows and Conservatories we offer our customers the highest standard at all times.

We offer a professional, efficient and friendly service and pride ourselves on catering for our customers’ needs. Customers who have used our replacement window services provide us with 100% positive feedback for our first-class products and service.

High Quality Upvc Windows

Free no obligation quotes, full range of door styles.

Upvc Windows

High Quality Upvc Doors

Free no obligation quotes, full range of window styles.

Upvc Doors

High Quality Composite Doors

Free no obligation quotes, full range of composite door styles.

Composite Doors

Warm Roof Systems


Based in Durham, Abacus Windows and Conservatories was set up 14 years ago by joiner Richard Parsons and his wife Mary Parsons. 

We offer a no-obligation free quotation service from your home or business. Richard Parsons has extensive knowledge having had 26 years experience in the profession. Richard personally carries out the free quotation service and offers expert advice whilst measuring up.

When it comes to installing our high-quality products, our two teams of fully trained installers ensure that we offer you a highly professional, efficient service at all times with the best guidance from the beginning right through to the end.

Latest Reviews

I would like to express my sincere gratitude to you and your staff for your excellent work

Maria Bennett, Derby

Thank you very much for fitting our conservatory, we’re very pleased with it. Thanks to all your staff who were very helpful

Jean and Joe Uren, Durham

We are delighted with the recent installation of replacement double-glazed windows and new patio doors. The work was carried out with the utmost professionalism and the least possible mess

Mrs Hicks, Tyne and Wear