Glass extension costs — expert advice on price and influencing factors

Render of glass ground floor extension on contemporary home
Glass extension costs can amount to more than a traditional build (Image credit: Tholos Architects)

It comes as no surprise that your glass extension costs will be higher if you're considering glass extension ideas.

As they are custom built and require the services of specialist suppliers, from the minute you consider a glass extension, your costing spreadsheet will need extra columns. Add to this the fact that glazing structures require precise measurements, and you'll understand why a larger contingency pot is also recommended in case there are unexpected and costly errors to fix.

male with short dark hear wearing black shirt
Dave Heeley

Dave Heeley is a chartered structural engineer with over 17 years of experience in structural engineering consultancy. He has delivered schemes of various scales and complexity in the UK and abroad, many of which have won RIBA Conservation and Material awards. 

woman with shoulder length blonde hair
Charlie Avara

After a very successful career as MD of a design and build company Charlie now runs her own domestic contracting business, BUILD by Charlie. With over 15 years in the industry Charlie has built up a wealth of knowledge on all things renovating and remodelling with a proven track record of delivering on projects ranging from the ultra modern, through to period properties, working with architects or directly with the homeowners. 

headshot of female with black bob wearing red blouse
Michelle Martin

Senior marketing executive at IQ Glass, Michelle possesses a strong passion for delivering great customer service, and her knowledge on all elements of glazing from windows and doors to glass structures ensures she delivers the right product experiences to suit the client's needs.

Sarah Harley
Assistant Editor

Sarah is Homebuilding & Renovating’s Assistant Editor and joined the team in 2024. An established homes and interiors writer, Sarah has renovated and extended a number of properties, including a listing building and renovation project that featured on Grand Designs. Although she said she would never buy a listed property again, she has recently purchased a Grade II listed apartment. As it had already been professionally renovated, she has instead set her sights on tackling some changes to improve the building’s energy efficiency, as well as adding some personal touches to the interior.