Modernes Wohngebäude mit cremefarbener Fassade und grauem Dach bei bewölktem Himmel.
Refurbishment

Get your home up to date

Modern KOCHS windows ensure maximum energy savings and are technically sophisticated, eligible for funding and durable. This gives you efficiency and convenience with minimal effort.

Eligibility
Implement restructuring measures efficiently and financially beneficial
Thermal insulation
For a comfortable indoor climate
Modernizing
Sustained increase in the value of your property
Energy efficiency
Reduces consumption, protects the environment and budget.
Old building compatibility
Fits perfectly into existing structures.
Modern weißes Fensterelement mit Glas, das einen verschwommenen Blick auf einen Essbereich mit Tisch und Stühlen zeigt.

The KOCHS window for your renovation

Nahaufnahme eines weißen Fenstergriffs an einem modernen Fenster mit verschwommenem Esszimmerhintergrund.
Thermal insulation

Saving energy made easy

Old windows cause high energy losses. Our renovation windows can be replaced without much effort, offer excellent insulation values and significantly reduce heating costs. At the same time, they meet the requirements of many funding programs and are a sustainable investment.

Nahaufnahme eines geöffneten weißen Fensterrahmens mit unscharfem Blick auf einen Garten hinter dem Fenster.
Sustainability

A value that lasts

With durable materials and a well-thought-out construction, the KOCHS window is a sustainable investment in your home.

Ein modernes weißes Fenster mit einfacher Verglasung und einem unscharfen Blick auf einen Garten mit Sträuchern und Zaun im Hintergrund.
Compatibility

Solutions made with tact

Whether it's a listed building or an old building: Made to measure, the KOCHS window adapts precisely to your structural requirements — with simple installation and harmonious design.

Weißes Fenster mit Glasfront, Griff auf der linken Seite und vier Farbmusterkreisen darunter in Weiß, Schwarz, Grau und Holzoptik.
Design

One window exactly
in your style

Choose the shape, color and material so that your window matches the architecture of your house down to the last detail. New windows improve the indoor climate, reduce outside noise and increase safety. In this way, you not only gain technical quality, but also a noticeably better quality of life.

Ein Paar sitzt auf einem Sofa, während der Mann ein Tablet benutzt. Die Frau lehnt lächelnd an seiner Schulter. Im Hintergrund sitzt ein Kind und spielt mit einem Tablet. Sonnenlicht fällt durch das Fenster.

Energetic refurbishment

Inquire about windows today, get the best advice tomorrow

We have the solution for you: new windows & doors quickly & easily.

More about the topic
“I would like to thank KOCHS for the outstanding work that KOCHS has done for us. From planning to installation, everything went perfectly. The preparation was great and the execution flawless. Special praise goes to the assembly team: They were highly competent, very friendly and helpful. This professionalism is truly remarkable. ”

David Wilms

Aachen, 14.10.2025

“We came across KOCHS through recommendations and were not disappointed. We received very good advice from the very first contact. The measurement of the door, the discussion of the details and the assembly took place quickly, professionally and very friendly. We are very satisfied and can only recommend KOCHS.”

Jens und Sabine Beyer

Kreuzau, 10.08.2025

“We are more than satisfied with the production of the window and the new front door. The two fitters are also satisfied. ”

Beate Albrecht

Alsdorf, 05.08.2025

“When we urgently needed a patio door, KOCHS were the only ones who had appointments at short notice. The good communication before and during execution as well as the punctuality and reliability of the assembly team were particularly positive. The new sliding door is visually appealing and has already had a noticeable effect on thermal insulation and sound insulation. ”

Derya Demirtas

Baesweiler, 03.07.2025

“We were very satisfied from the first discussion about measures and completion — all deadlines were met on time and work was carried out perfectly. Top performance!”

Mirja Heidemann

Alsdorf, 12.01.2024

“From planning to execution, everything was precisely planned, prepared and executed.
The customer advisor, the fitters and the administrative staff are very friendly and customer-oriented. The front door was changed promptly, without complaint and, above all, professionally. ”

Bernd Korall

Herzogenrath, 11.06.2024

“The scheduling was great. Delivery and installation simply super professional.
Thank you and always happy!”

Friedhelm Schmitz

Stolberg dispute, 10.01.2024

Drei Fensterrahmen in Schwarz, Grau und Weiß mit den Beschriftungen Design Themenwelt, Sicherheit Themenwelt und Effizienz Themenwelt.
Thematic areas

Find the right KOCHS window for 
your home

Whether stylish design, reliable safety or environmentally friendly efficiency, every cooking theme shows what a window can do. They all combine the highest quality, durable materials and innovative technology for a home that suits you.

Learn more
Drei Fensterrahmen in Schwarz, Grau und Weiß mit den Beschriftungen Design Themenwelt, Sicherheit Themenwelt und Effizienz Themenwelt.

Your next steps with KOCHS

Ein Paar sitzt auf einem Holzboden und schaut sich Farbmuster und Inneneinrichtungszeitschriften an. Auf einem der Muster steht ein kleiner Hund.
Step 1

Consultation and initial measurement

In an initial consultation, we will discuss your wishes. It is ideal to have a consultation with your personal contact at your site in order to make an initial measurement directly.
Ein Mann und eine Frau sitzen an einem Tisch und unterhalten sich. Die Frau hält einen Stift in der Hand und schreibt in ein Notizbuch. Im Vordergrund ist ein Laptop zu sehen.
Step 2

Selection of windows and doors

After measurement and initial consultation, it's time to get down to the details. You select the windows and doors of your choice and we individually adapt the style, functionality and energy efficiency.
Eine Person verwendet ein Maßband, um die Breite eines weißen Fensterrahmens zu bestimmen.
Step 3

Preparation of offers with a fixed price

If everything is perfectly configured for your home, you will receive your individual offer — transparently, without hidden additional costs. With the KOCHS price guarantee, this price is fixed.
Frau mit Brille und Headset sitzt an einem Schreibtisch und tippt auf einer Tastatur vor einem Computer.
Step 4

Production and assembly

We manufacture your windows and doors according to your specifications. Installation is carried out quickly, cleanly and on time by our specialist staff — including disassembly and disposal if required.

FAQs

Which window systems does KOCHS offer?

KOCHS produces high-quality plastic windows and aluminum windows with a modern design, excellent thermal insulation values, a high level of safety and durability. Ideal for new construction, renovation or renovation. Discover our systems in our exposition.

Are individual dimensions and designs possible?

Yes, all KOCH windows are custom-made in Herzogenrath. Choose from countless colors, shapes, glazing and handles — perfectly tailored to your style. Contact us for a personal advice.

How energy efficient are KOCH windows?

Our energy-efficient windows meet passive house standards and achieve top Uw values. This reduces heating costs and CO₂ emissions. Find out more about our sustainable solutions.

Does KOCHS offer burglar-resistant windows?

Safety is the focus: Our windows with burglary protection, safety glazing, mushroom head lock and lockable handles effectively protect your home. Get a free offer.

How long is the delivery time?

Usually 5-6 weeks from technical approval, depending on product and order size. There may be deviations in the case of custom-made products. Plan your project with us — inquire now.

Is there an assembly service?

Yes, KOCHS delivers and assembles via its own teams in the Aachen region or qualified specialist partners. These take care of measurement, installation and maintenance. For local end customers: visit our Exhibition in Herzogenrath.

Does KOCHS offer funding advice?

Absolutely! Our partners advise on KfW or BAFA subsidies for energy-efficient renovations and burglary protection. KOCHS provides evidence and, upon request, accepts the application. Take advantage of our Funding advice.

How long is the warranty period?

4-year manufacturer's warranty with proper installation and care. Expanded conditions may apply to components.

How do I properly care for KOCH windows?

Our easy-to-clean windows are easy to clean with a mild agent. Regular maintenance of seals and fittings ensures durability. Care instructions are included with every product.

How can I obtain KOCH windows?

As an end customer, contact a specialist partner near you — for local customers, we recommend our exposition. Architects and planners receive technical data and documents on our specialized landing page.

Why are plastic windows (PVC) more sustainable than wooden windows?

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspend Varius Enim in Eros Elementum Tristique. Duis cursus, mi quis viverra ornare, eros dolor interdum nulla, ut commodo diam libero vitae erat. Aenean Faucibus Nibh et Justo Cursus id Rutrum Lorem Imperdiet. Nunc ut sem vitae risus tristique posuere.

Do you still have questions? Talk to us.

Contact
Quality at a fixed price
Binding appointment
75 years of experience
Quality guarantee
Produced in Germany
Eine Frau mit blondem Haar steht selbstbewusst mit den Händen in den Hüften. Sie trägt einen schwarzen Blazer, ein graues Oberteil und Jeans und lächelt in einer Innenumgebung.

Take the first step today!

Eine Frau mit blondem Haar trägt einen schwarzen Blazer, ein graues Oberteil und lächelt in einer Innenumgebung.

With us, you don't have to wait long — get your consultation appointment quickly and easily!

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