Premium Doors & Windows

European Precision,California Comfort

As the exclusive Northern California dealer for Bertrand, we bring you over five decades of European engineering excellence. Experience windows and doors that combine superior performance with timeless elegance.

Superior Security

Multi-point locking systems and reinforced frames for ultimate protection

Energy Efficiency

Advanced thermal performance that reduces energy costs year-round

European Excellence

55+ years of German engineering and craftsmanship tradition

55+

Years Excellence

Exclusive Dealer

Bertrand Partnership

Certified manufacturer since 1969, delivering exceptional windows and doors with uncompromising quality and craftsmanship.

Bertrand Windows

Since 1969

A wide range of solutions that are a practical element of every home. Certified manufacturer since 1969, specializing in windows that affect aesthetics and energy efficiency. Our offer includes windows made of various materials, ensuring durability, high insulation and an elegant appearance.

Materials

PVCAluminumWood

Benefits

54+ years experienceCertified qualityEnergy efficientElegant appearance

Bertrand Doors

Since 1969

Comprehensive door product range combining modern design with the highest quality of workmanship. As a certified manufacturer since 1969, we offer doors that are synonymous with modernity, durability and functionality, ensuring both safety and aesthetic appeal.

Materials

AluminumPVCWood

Benefits

Modern designDurabilityFunctionalityProfessional quality

Exclusive Partnership

Bertrand Excellence

Monsen Collins Builders is proud to be Northern California's exclusive dealer for Bertrand – a renowned European manufacturer delivering over 55 years of doors and windows excellence.

Bertrand Quality

European craftsmanship since 1969

55+

Years

Why ChooseMonsen Collins Builders?

Exclusive Access

As the only authorized Bertrand dealer in Northern California, we provide exclusive access to premium European doors and windows.

Proven Quality

Over five decades of manufacturing excellence, delivering products that exceed industry standards for durability and performance.

European Standards

German engineering precision combined with materials perfectly suited for California's unique climate requirements.

Resource Library

Product Catalogues &Technical Resources

Explore our comprehensive collection of detailed specifications, design guides, and technical documentation to help you make informed decisions for your next project.

Featured Resource

Bertrand Product Catalogue

Our flagship catalogue showcases the complete range of Bertrand windows, doors, and terrace systems. Featuring detailed technical specifications, installation guides, and design inspiration to help you create exceptional spaces.

Download Complete Catalogue