What is a glass box extension and is one a good idea for your build?

modern glass box extension to period house
(Image credit: IQ Glass)

Adding a well-designed glass box extension to a house is a surefire way to ensure your new addition makes a big statement, yet they are also perfect for those who want to extend a period property in a way that doesn't detract from the original building. 

That said, there are some serious design considerations to bear in mind if you are thinking of building an extension made wholly from glass – including the issue of overheating. There is also the not so insignificant matter of costs to think about – this is certainly not the cheapest way to add space to a house.

Rebecca Clayton
Rebecca Clayton

Rebecca Clayton is communications director at IQ Glass. She has many years of experience with the company, who specialise in architectural glazing and installs some of the most pioneering architectural glass technology available today. 

Jason Laity
Jason Laity

During his architectural career, Jason Laity has enjoyed working on both national and international works of significance and introduces a design-led approach to all projects undertaken by Unity Architects.

His RIBA certified qualifications in the field include a First Class Degree in Architecture and a Diploma in Architecture with Distinction. Jason is a registered architect with the Architects Registration Board (ARB) and is a Chartered Member of the Royal Institute of British Architects (RIBA).

Natasha Brinsmead

Natasha is Homebuilding & Renovating’s Associate Content Editor and has been a member of the team for over two decades. An experienced journalist and renovation expert, she has written for a number of homes titles. Over the years Natasha has renovated and carried out a side extension to a Victorian terrace. She is currently living in the rural Edwardian cottage she renovated and extended on a largely DIY basis, living on site for the duration of the project. She is now looking for her next project — something which is proving far harder than she thought it would be.