SUSTAINABLE, HIGH PERFORMANCE WINDOW & DOOR SOLUTIONS

Sustainable, High-Performance Windows and Doors, with Smart Security, Installed by Certified Experts

okoHaus supplies and installs high-performance windows, doors and compatible smart home security systems across East Anglia and beyond.

We specialise in energy-efficient, low-maintenance solutions from Europe’s leading manufacturers, including timber, aluminium-clad timber and triple-glazed systems.

Whether you're working on a new build, self-build or renovation, we offer full supply and installation services, and also provide expert guidance and product supply for those managing their own project.

Energy-Efficient Windows, Doors and Security from Europe’s Leading Manufacturers

Explore our curated range of sustainable, high-performance products from Europe’s most trusted brands.

okoHaus is an authorised distributor and installer of Internorm, Velfac, Rationel, Solarlux and Bel'M products; each selected for their market-leading thermal performance, design flexibility and environmental credentials. We offer their full product ranges with technical support, expert installation and tailored guidance for architect-led or self-managed builds.

Sustainability is central to our work. From FSC-certified materials to products designed for long life and minimal environmental impact, we focus on low-impact solutions and are committed to becoming carbon neutral by 2030.

Our team includes Certified Passive House Tradesperson, and we offer Passive House-certified solutions from Internorm, ideal for ultra-low-energy homes and advanced self-build projects.

Every project is specified for energy efficiency, long-term durability and full UK Building Regulations compliance, with warranty-backed support from consultation to completion.

Internorm Eco-Friendly Windows & Doors

Certified for Passive House performance, Internorm windows and doors combine world-class insulation, triple glazing, and sleek aluminium-clad timber or uPVC designs. With U-values as low as 0.62 W/m²K, Part Q-compliant security, and four signature design styles, they’re ideal for low-energy homes and eco-conscious projects.

Explore Passive House windows and doors by Internorm

Velfac Composite Windows & Doors

Velfac composite windows and doors feature slim 54mm sight lines, FSC-certified timber, and aluminium exteriors. With triple glazing, sound insulation up to 42dB, and Secured by Design compliance, they offer over 50 years of life expectancy and allow different internal and external colour finishes: all with minimal maintenance and maximum architectural appeal.

Discover slim composite windows and doors by Velfac

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Rationel Bespoke Windows & Doors

Rationel windows and doors combine FSC-certified timber with optional aluminium cladding for lasting durability and design flexibility. Choose double or triple glazing, dual-colour finishes, and low U-values down to 0.78 W/m²K; with a lifespan of 60+ years and full Part Q security compliance.

Find the right Rationel window style for your home

Solarlux Sliding & Bi-Folding Doors

Solarlux doors offer slim-frame sliding and bi-folding systems with advanced thermal performance and huge customisation potential. Available in aluminium, timber, or alu-clad timber, they’re perfect for large openings, low-energy homes, and contemporary architectural designs.

Open up your home with Solarlux glazed door systems

Bel'M Entrance Doors

Bel'M entrance doors combine French craftsmanship with modern performance and UKCA certification. Choose from sleek aluminium, warm timber, or hybrid AluSteel designs; all tailored for energy efficiency, security, and sustainable construction.

Nimly Smart Locks

Nimly smart locks offer fingerprint, code, and app-based access for modern, secure living. Designed in Scandinavia and fully compatible with Rationel and Velfac doors, they combine smart home integration with military-grade encryption and sleek design.

Partners In Wildlife

As part of our commitment to environmental responsibility, we have committed to Partner In Wildlife status. Suffolk Wildlife Trust supports a number of projects local to us to improve biodiversity and encourage re-wilding. Through our partnership, we hope to aid them both physically and financially.

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 assured 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.

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.