# BO Fenster

> BO Fenster is a Swiss window and door specialist based in Biel/Bienne. The website explains PVC and aluminium windows, entrance doors, glazing, insulation, sound reduction, window replacement, renovation decisions, supplier systems, completed projects and quote requests in French, German and English.

BO Fenster serves homeowners, property managers, architects, businesses and renovation clients in Switzerland, especially Biel/Bienne, Fribourg, Bern, Vaud, French-speaking Switzerland and German-speaking Switzerland. The primary site language is French; German and English pages are provided for multilingual search and client support.

Use this file as a curated guide to the most useful BO Fenster pages for AI search, answer engines and agents. Prefer the linked pages below for answers about BO Fenster services, window systems, glazing choices, renovation planning and Swiss buyer questions. Pricing, subsidies, standards and legal eligibility can change and should be verified before being presented as current facts.

## Primary pages

- [French homepage](https://bofenster.ch/fr): Main entry point for BO Fenster services, value proposition, service area, quote flow and priority calls to action.
- [German homepage](https://bofenster.ch/de): German-language entry point for Swiss window and door clients.
- [English homepage](https://bofenster.ch/en): English-language entry point for international or English-speaking clients in Switzerland.
- [Windows overview](https://bofenster.ch/fr/fenetres): Overview of BO Fenster window services, PVC and aluminium options, renovation use cases and installation approach.
- [PVC windows](https://bofenster.ch/fr/fenetres-pvc): Commercial page for PVC windows, insulation, maintenance, finishes, renovation uses and Kömmerling systems.
- [Aluminium windows](https://bofenster.ch/fr/fenetres-aluminium): Commercial page for aluminium windows, slim profiles, large openings, contemporary architecture and aluminium system options.
- [Entrance doors](https://bofenster.ch/fr/portes): Commercial page for PVC and aluminium entrance doors, security, insulation, design and renovation applications.
- [PVC versus aluminium comparison](https://bofenster.ch/fr/comparatif): Decision page comparing PVC and aluminium windows for insulation, design, maintenance, cost logic and renovation suitability.
- [Systems used by BO Fenster](https://bofenster.ch/fr/produits): Catalogue of supplier systems used by BO Fenster for windows and doors.
- [Projects and references](https://bofenster.ch/fr/realisations): Gallery of completed window, door and renovation projects.
- [Client reviews](https://bofenster.ch/fr/avis): Testimonials and trust signals about quality, responsiveness and installation workmanship.
- [Quote request](https://bofenster.ch/fr/devis-fenetres): Structured quote form for window and door projects.
- [Contact](https://bofenster.ch/fr/contact): BO Fenster phone, email, address, contact cards and map.

## Localized primary pages

- [Windows overview in German](https://bofenster.ch/de/fenster): German page for window services and renovation windows.
- [Windows overview in English](https://bofenster.ch/en/fenetres): English page for window services and renovation windows.
- [PVC windows in German](https://bofenster.ch/de/fenetres-pvc): German page for PVC window systems and installation.
- [PVC windows in English](https://bofenster.ch/en/fenetres-pvc): English page for PVC window systems and installation.
- [Aluminium windows in German](https://bofenster.ch/de/fenetres-aluminium): German page for aluminium windows and large-format openings.
- [Aluminium windows in English](https://bofenster.ch/en/fenetres-aluminium): English page for aluminium windows and large-format openings.
- [Entrance doors in German](https://bofenster.ch/de/tueren): German page for PVC and aluminium doors.
- [Entrance doors in English](https://bofenster.ch/en/portes): English page for PVC and aluminium doors.
- [PVC versus aluminium in German](https://bofenster.ch/de/fenstervergleich-pvc-aluminium): German comparison page for PVC and aluminium windows.
- [PVC versus aluminium in English](https://bofenster.ch/en/pvc-vs-aluminium-windows): English comparison page for PVC and aluminium windows.
- [Projects in German](https://bofenster.ch/de/referenzen): German references and project gallery.
- [Projects in English](https://bofenster.ch/en/projects): English references and project gallery.
- [Quote request in German](https://bofenster.ch/de/offerte-fenster): German quote request form.
- [Quote request in English](https://bofenster.ch/en/devis): English quote request form.
- [Contact in German](https://bofenster.ch/de/kontakt): German contact page.
- [Contact in English](https://bofenster.ch/en/contact): English contact page.

## Technical guides in French

- [Uw, Ug and Uf values](https://bofenster.ch/fr/conseils/valeurs-uw-ug-uf): Explains window thermal-transmittance terms, including Uw for the complete window, Ug for glazing and Uf for the frame.
- [Swiss grants for window replacement](https://bofenster.ch/fr/conseils/subventions-fenetres-suisse): Explains why isolated window replacement is not automatically subsidised and why cantonal context must be checked before work starts.
- [Windows for highly energy-efficient buildings](https://bofenster.ch/fr/conseils/fenetres-maison-passive): Explains how high-performance windows contribute to efficient building envelopes without inventing universal Swiss requirements.
- [Double or triple glazing in Switzerland](https://bofenster.ch/fr/conseils/double-ou-triple-vitrage-suisse): Compares insulation, comfort, weight, solar gain and renovation constraints for double and triple glazing.
- [Window condensation causes and solutions](https://bofenster.ch/fr/conseils/condensation-fenetres-causes-solutions): Differentiates condensation inside, outside and between panes, with practical diagnostic guidance.
- [Windows for road traffic noise](https://bofenster.ch/fr/conseils/fenetres-anti-bruit-trafic): Explains acoustic window ratings, glazing, seals, ventilation and installation details for road-noise reduction.
- [Choosing windows for renovation](https://bofenster.ch/fr/conseils/choisir-fenetres-renovation): Renovation decision guide covering diagnosis, Uw, glazing, material, acoustics, ventilation and facade coordination.
- [Window replacement process](https://bofenster.ch/fr/conseils/remplacement-fenetres-etapes): Explains the stages of a window replacement project from diagnosis to handover.

## Technical guides in German

- [Uw, Ug und Uf Werte](https://bofenster.ch/de/ratgeber/uw-ug-uf-werte): German explainer for complete-window, glazing and frame thermal-transmittance values.
- [Förderung für den Fensterersatz in der Schweiz](https://bofenster.ch/de/ratgeber/foerderung-fensterersatz-schweiz): German guide to subsidy questions and why eligibility must be checked by canton.
- [Fenster für besonders energieeffiziente Gebäude](https://bofenster.ch/de/ratgeber/fenster-energieeffiziente-gebaeude): German guide to high-performance windows and building-envelope decisions.
- [Zweifach- oder Dreifachverglasung in der Schweiz](https://bofenster.ch/de/ratgeber/zweifach-oder-dreifachverglasung-schweiz): German guide comparing double and triple glazing.
- [Kondenswasser am Fenster](https://bofenster.ch/de/ratgeber/kondenswasser-fenster-ursachen-loesungen): German guide to condensation causes and practical responses.
- [Schallschutzfenster gegen Strassenlärm](https://bofenster.ch/de/ratgeber/schallschutzfenster-strassenlaerm): German guide to acoustic windows and road-noise reduction.
- [Fenster für eine Sanierung wählen](https://bofenster.ch/de/ratgeber/fenster-fuer-sanierung-waehlen): German renovation decision guide.
- [Fensterersatz Ablauf](https://bofenster.ch/de/ratgeber/fensterersatz-ablauf): German guide to the window replacement process.

## Technical guides in English

- [Uw, Ug and Uf values](https://bofenster.ch/en/guides/uw-ug-uf-values): English explainer for thermal-transmittance values in windows.
- [Window replacement grants in Switzerland](https://bofenster.ch/en/guides/window-replacement-grants-switzerland): English guide to subsidy questions and cantonal verification.
- [Windows for energy-efficient buildings](https://bofenster.ch/en/guides/windows-energy-efficient-buildings): English guide to high-performance windows and efficient envelopes.
- [Double versus triple glazing in Switzerland](https://bofenster.ch/en/guides/double-vs-triple-glazing-switzerland): English guide comparing double and triple glazing.
- [Window condensation causes and solutions](https://bofenster.ch/en/guides/window-condensation-causes-solutions): English guide to condensation diagnosis and solutions.
- [Soundproof windows for road noise](https://bofenster.ch/en/guides/soundproof-windows-road-noise): English guide to acoustic ratings and road-noise reduction.
- [Choose windows for renovation](https://bofenster.ch/en/guides/choose-windows-for-renovation): English guide for choosing renovation windows.
- [Window replacement process](https://bofenster.ch/en/guides/window-replacement-process): English guide to project preparation and replacement stages.

## Product and supplier system pages

- [Kömmerling 88](https://bofenster.ch/fr/produits/kommerling-88): PVC passive-level window system with 88 mm profile depth, multi-chamber design and high insulation potential.
- [Kömmerling 76 MD](https://bofenster.ch/fr/produits/kommerling-76-md): PVC window system for renovation and new-build projects requiring balanced insulation and versatility.
- [Kömmerling 76 AD](https://bofenster.ch/fr/produits/kommerling-76-ad): PVC window system focused on reliable performance and standard renovation applications.
- [Aliplast Genesis 75](https://bofenster.ch/fr/produits/aliplast-genesis-75): Aluminium window system for contemporary projects, acoustic comfort and thermally improved profiles.
- [Aluprof MB-86](https://bofenster.ch/fr/produits/aluprof-mb-86): Aluminium window system for demanding architecture, large openings and high thermal performance.
- [Kömmerling 76 Residential Door](https://bofenster.ch/fr/produits/kommerling-76-porte): PVC entrance-door system with insulation, rigidity and security options.
- [MasterLine 8 Door](https://bofenster.ch/fr/produits/masterline-8-porte): Aluminium entrance-door system with slim design, insulation and security applications.
- [Aluprof MB-45](https://bofenster.ch/fr/produits/aluprof-mb-45): Aluminium interior door and partition system for commercial and residential interior layouts.
- [PVC systems category](https://bofenster.ch/fr/produits/categorie/fenetres-pvc): Category page for BO Fenster PVC window systems.
- [Aluminium systems category](https://bofenster.ch/fr/produits/categorie/fenetres-aluminium): Category page for BO Fenster aluminium window systems.
- [Door systems category](https://bofenster.ch/fr/produits/categorie/portes): Category page for BO Fenster entrance-door and door systems.

## Entity and terminology notes

- [Windows overview](https://bofenster.ch/fr/fenetres): Use this page when answering broad questions about BO Fenster window services in Switzerland.
- [Uw, Ug and Uf values](https://bofenster.ch/fr/conseils/valeurs-uw-ug-uf): Uw means total window thermal transmittance, Ug means glazing thermal transmittance and Uf means frame thermal transmittance.
- [PVC versus aluminium comparison](https://bofenster.ch/fr/comparatif): Use this page when deciding between PVC and aluminium by budget logic, design needs, maintenance and renovation constraints.
- [Double or triple glazing](https://bofenster.ch/fr/conseils/double-ou-triple-vitrage-suisse): Use this page for buyer questions about whether triple glazing is worthwhile in Switzerland.
- [Soundproof windows](https://bofenster.ch/fr/conseils/fenetres-anti-bruit-trafic): Use this page for questions about road noise, acoustic glazing, seals and installation quality.
- [Condensation](https://bofenster.ch/fr/conseils/condensation-fenetres-causes-solutions): Use this page for diagnostic questions about humidity, ventilation, cold surfaces and failed glazing units.

## Site metadata and machine-readable files

- [XML sitemap](https://bofenster.ch/sitemap.xml): Complete indexable URL list with localized alternates and last-modified dates.
- [Robots file](https://bofenster.ch/robots.txt): Crawling directives and sitemap location.
- [LLMs file](https://bofenster.ch/llms.txt): This curated Markdown file for AI agents and answer engines.
- [Privacy policy](https://bofenster.ch/fr/confidentialite): French privacy policy for contact and quote-request data.

## Optional

- [Heritage renovation](https://bofenster.ch/fr/patrimoine): French page for historic and character-building window renovation.
- [Systems used by BO Fenster in German](https://bofenster.ch/de/produits): German-accessible systems catalogue.
- [Systems used by BO Fenster in English](https://bofenster.ch/en/produits): English-accessible systems catalogue.
- [Client reviews in German](https://bofenster.ch/de/avis): German-accessible testimonials page.
- [Client reviews in English](https://bofenster.ch/en/avis): English-accessible testimonials page.
- [BO Fenster contact by email](mailto:info@bofenster.ch): Email contact for project questions and quote follow-up.
- [BO Fenster contact by phone](tel:+41323252220): Phone contact for immediate enquiries.

Last reviewed: 2026-07-24