The people behind Fensterwerke³
Fensterwerke³ GmbH – also known as Fensterwerke3 GmbH – was founded by three experienced entrepreneurs and long-time friends from the window manufacturing and software industry. We were frustrated that buying windows online is often complicated, expensive and opaque. That's why our goal is to make buying windows online better and rethink direct sales.
Who we are
Three experts from window manufacturing and software development who are revolutionising online window retail together.
Economist, experienced window manufacturing entrepreneur & e-commerce professional. He has known the industry for many years and brings the ideal combination of expertise and market understanding to offer customers the best solution.
Industrial engineer and self-employed in window manufacturing for years. With his technical and practical approach, he ensures that functionality and quality of our products always come first.
Software developer and our expert for technology, website and digital processes. He makes our platform intuitive and modern and ensures the ordering process remains as simple as possible for our customers.
Why Fensterwerke³?
Our advantages at a glance – transparency, quality and service.
German contacts
We support you personally – no language barriers, no detours.
Brand products at fair prices
Salamander, Aluplast, Gealan, Rehau, Aluprof and Naturo – sourced directly and priced efficiently.
Honest advice
We don't offer what we wouldn't recommend. Period.
Clear delivery times
No empty promises – usually 3–4 weeks after payment.
Installment payment available
Flexible payment with PayPal instalments – pay comfortably in several instalments.
5-year warranty
On our products – because we stand for quality.
Individual configuration
Colour, equipment & more – everything tailored to your requirements.
Quick response
We respond within a short time – directly, competently and honestly.
Exclusive B2B terms
Simply submit business registration & VAT ID.
How it works
From enquiry to delivery – this is how the ordering process works.
Enquiry via configurator
You tell us what you need – we check whether and how it makes sense.
Personal review & advice
We get back to you quickly, clarify open questions and advise honestly.
Individual offer
Transparent, traceable, binding. No guessing.
Order & payment
After approval and payment, your window goes into production.
Delivery
After 3–4 weeks, your delivery arrives directly to your door.
Our vision
Windows in uPVC, aluminium, timber and timber-aluminium, plus sliding doors, sun protection, entrance doors, garage doors, pergolas and property fences: that is how we make buying windows online a clear choice – direct, transparent and made to measure.
Your online specialist retailer at Lake Constance
Based in Singen (Hohentwiel), we supply customers throughout the Lake Constance region, Baden-Württemberg, Germany, Austria and Switzerland – and across the EU (for example France, Italy, Spain and Portugal). Whether you are buying windows online for your home or your business, we advise you by phone and online and deliver reliably. The range runs from uPVC, aluminium, timber and timber-aluminium windows to sliding doors, roller shutters, external venetian blinds, entrance doors, garage doors, pergolas and property fences. Our products are manufactured in the EU – for quality, short routes and fair prices.
Company information
All important information about Fensterwerke³ – compact for quick reference.
About Fensterwerke³
Fensterwerke³ is your partner for windows in uPVC, aluminium, timber and timber-aluminium, and for sliding doors, sun protection, entrance doors, garage doors, pergolas and fences in the DACH region and the EU. We deliver made-to-measure solutions for your home.
In the online configurator you design uPVC windows from Salamander, Aluplast, Gealan and Rehau, aluminium windows from Aluprof, and timber and timber-aluminium windows from Naturo. Sliding doors and sun protection from Aluprof and Beck+Heun can be ordered directly as well.
Our services
Window configurator
Configure windows in uPVC, aluminium, timber and timber-aluminium, plus sliding doors, sun protection, entrance doors, garage doors, pergolas and fences online. Choose brand, material, size and fittings.
Windows from leading brands
Salamander windows: High-quality windows in various materials and sizes with proven quality.
Aluplast windows: Modern windows with good thermal insulation and innovative technology.
Gealan windows: Innovative windows for the highest demands with modern design.
Rehau windows: Reliable windows with proven quality and long service life.
Sliding doors
Elegant sliding doors for more space and modern living solutions. Various designs and materials available.
Sun protection systems
Exterior roller shutters: Optimal sun protection and burglary protection for your home.
Built-on roller shutters: Compact solutions for sun protection.
Exterior venetian blinds: Flexible sun protection and privacy with modern design.
Built-on venetian blinds: Space-saving sun protection solutions for every need.
Aluprof sun protection: Premium systems for roller shutters and venetian blinds with highest quality and durability.
Beck+Heun sun protection: High-quality systems and roller shutters with proven technology and reliability.
Entrance doors
Entrance doors and side entrance doors from Salamander, Aluplast, Gealan, Rehau as well as aluminium doors – view catalogues & custom configuration.
Garage doors
Sectional doors, roller doors – configurable online or via catalogue. Individual advice for your garage door.
Pergola
Freestanding Aluprof aluminium pergola SB350 from €5,375.86 incl. 19% VAT (DE) and 35% discount – four projections from 3.40 to 4.75 m, motorised, configurable online.
Property fences
Double mesh fence, trellis, privacy screens – individually configurable fencing systems for your property.
DACH and EU-wide delivery
We deliver throughout the DACH region and EU – whether Portugal, Italy or France, we deliver. Benefit from professional advice.
Location and service area
Our location: Singen (Hohentwiel) in Baden-Württemberg. We deliver in DACH and EU – Germany, Austria, Switzerland, Spain, France and other countries.
Address: Auf der Höhe 9, 78224 Singen (Hohentwiel), Germany
Service area: Germany, Austria, Switzerland, EU – DACH and EU-wide delivery and advice
Contact and opening hours
Phone: +49 7731 1690280
Email: info@fensterwerke3.de
Phone availability: Monday to Friday 08:00 - 18:00 & Saturday 09:00 - 16:00 (no showroom – no retail store)
Company details
Fensterwerke³ GmbH
VAT ID: DE456907883
Registration number: HRB 733930
Local court: 79098 Freiburg im Breisgau
Why choose Fensterwerke³?
- Years of experience in windows and doors
- Online configurator for easy ordering
- High-quality materials and workmanship
- Professional advice
- Personal online advice & reliable delivery
- Individual solutions for every need
Product categories and brands
Windows by brand
Salamander: uPVC windows and sliding doors
Aluplast windows: PVC windows with excellent thermal insulation
Gealan windows: Innovative PVC windows for highest demands
Rehau windows: Reliable PVC windows with proven quality
Aluprof aluminium windows: MB-79N SI, MB-86N SI and MB-104 Passive SI
Naturo: timber windows Naturo 68, 80 and 92, and timber-aluminium windows Naturo 68 ALU and Naturo 80 ALU
Windows by type
Tilt-turn windows, casement windows, fixed glazing, roof windows, tilt windows, turn windows
Sliding doors
Salamander, Aluplast, Gealan, Rehau sliding doors: lift-slide doors, parallel sliding doors, sliding doors with guide rail, glass doors
Entrance doors
Entrance doors and side entrance doors from Salamander, Aluplast, Gealan, Rehau as well as aluminium doors – view catalogues & custom configuration.
Sun protection systems
Roller shutters: Exterior, built-on, recessed roller shutters
Venetian blinds: Exterior, built-on, interior venetian blinds
Aluprof sun protection: Premium roller shutters and venetian blinds with highest quality and durability
Beck+Heun sun protection: High-quality systems and roller shutters with proven technology
Garage doors
Sectional doors, roller doors – configurable online or via catalogue. Individual advice for your garage door.
Property fences
Double mesh fence, trellis, privacy screens – individually configurable fencing systems for your property.
Pergola
Aluprof SB350 – freestanding aluminium pergola with motorised louvered roof, four projection variants and five structure colours – configurable online.
Ready for your project?
Made to measure · Transparent · Personal