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Energy Efficient windows and doors

In today’s world of energy consciousness, recycling and sustainable home design, our experienced and approachable team will help you identify and achieve your goals for building or adapting your home - from taking your first steps along the efficiency improvement path through to full Passivhaus (Passive House) accreditation if this is your ultimate aim.

Helping you benefit from lower fuel bills and clean, efficient living, our wide choice includes windows and doors to suit your preferred design style and budget with surprisingly affordable options available.

Installation is by our qualified engineers and we have a specialist Passivhaus consultant on hand should you need this service.

Please feel free to visit our showroom at your convenience. If you prefer to book an appointment to ensure dedicated one to one attention then you can ring us on 0151 342 2266 or use our Contact Form to let us know a convenient time for us to call you back.

An investment in energy efficiency will reward you with reduced heating bills and help to preserve limited fuel resources. Why not ask us for a free consultation on energy saving windows and doors to add value and style to your home?

At John Knight Glass we have used our experience and knowledge to build relationships with trusted suppliers whose energy efficient products meet our own exacting standards for quality, reliability, engineering and design.

Introducing our partners 

Our partners enable us to provide you with the complete one stop solution for an energy efficient building. To find out more about each of our partners and how energy efficiency can lead to achieving Passiv Haus (Passive House) standards please click the logos below.


Bringing you energy efficient windows and doors in a choice of elegant styles with optional I-tec ventilation and locking systems.


Flexibility in low energy triple glazed, folding doors to access more space and increase natural light within your home.


Maximise your living area and create space with leading edge, high- performance doors in truly bespoke finishes.