At okoHaus we're experts in sustainable window & door systems.  We take pride in offering a full supply and install service, including making good if necessary.  We can also support you to undertake your own installation of our products, providing the advice and ancillary products you need to complete your project to a high standard.


Focussed in East Anglia and  the Northern Home Counties, we only offer products we believe in and would use in our own homes.


Our products have market leading performance and sustainability credentials and we take our environmental responsibilities seriously - aiming to be carbon neutral by 2025 or sooner.

okoHaus are approved distributors of Velfac, Rationel & FT-Vilstal products.  We offer a full supply and install service for both new build and refurbishment projects, and can therefore take full ownership of your project from first enquiry through to completion as well as dealing with any warranty issues along the way.  We are professionals at taking the stress and complexity out of the specification and coordination of these high performance products.

Check out the links below to get started with finding the right solutions for your project.



Buy one, get one tree

For every window or door purchased from 1st June 2021 onwards, okoHaus commit to plant one tree.

Working with C Free and The Future Forest Company we have committed to a programme of tree planting in the UK.

Read more about our sustainability aims in our blog.

Sustainable and secure

Our Rationel windows and doors are not only sustainable, but are also exceptionally secure as standard.  All products achieve Building Regulations Approved Document Part Q as well as Secured by Design certification.

Tested to the extreme

Our Velfac windows and doors are market leaders in air, wind and water tightness.  But don't just take our word for it, the full range has independent certification from 3rd party test houses.

93% fully recyclable

We make sure to choose products and suppliers who look after the environment.  So you can rest easy that by choosing okoHaus products, we've done the research for you.

Durability, tested to the max

Full durability and cyclic testing is an important part of product development and factory quality control.  We want your windows to stand the test of time and receive minimal call-backs, so nothing is left to chance.

Market leading water tightness

The last thing you need is leaks and the potential for damage to internal furnishings or, even worse, unseen damage to your building fabric.  That's why our Rationel products are certified to market leading levels of water tightness.

Wind tested for the most severe locations

Our Rationel products are tested and certified to extremely high levels of wind resistance, giving you peace of mind that they are more than up to the job of keeping you cosy and warm when the weather turns nasty.

Installation detailing to match

When specifying high performance window systems like ours, an equally high performance installation system is well worth the investment.  That's why we offer the Illbruck range of sealant and air tightness solutions.