Bestoff Windows

Business Details

30 Years

experience

Professional Window Replacement Services in Concord, CA

Bestoff Windows has been dedicated to delivering high-quality window replacement solutions since 1996. Our commitment to excellence is reflected in our use of energy-efficient, dual-pane vinyl windows and our meticulous installation process, backed by a transferable lifetime warranty. With over a million windows installed across the Bay Area, we prioritize customer satisfaction through personalized service, including free in-home consultations and estimates conducted by our owner, Sergey.

Our team of hand-picked installers, trained by industry experts with 23 years of experience, ensures every project meets the highest standards of craftsmanship. We maintain a strong focus on transparency, offering no-deposit policies and price-matching guarantees while serving Alameda, Contra Costa, and Solano counties. Our consistent 5-star reviews and extensive local referrals underscore our reputation as a trusted leader in window replacement solutions.

Services

Window Installation Window Replacement Energy-Efficient Windows Door Installation Retrofitting

Details

Year established: 1996

Highlights and features

We offer a transferable lifetime warranty on products and installations.
Our owner has 23 years of specialized window replacement expertise.
Free in-home estimates with no sales pressure guaranteed.
Energy-efficient vinyl windows from top industry manufacturers.
Consistent 5-star customer reviews since 2001.

What people say

Excellent service Prompt response Professional crew Competitive pricing Lifetime warranty

Website

Update Listing

Services

Window Installation

Professional window installation services using energy-efficient vinyl windows. Our trained technicians ensure precise measurements and proper sealing for optimal performance. We specialize in retrofit installations that maintain structural integrity while improving energy efficiency.

Window Replacement

Complete window replacement solutions for residential properties. We replace outdated single-pane windows with modern dual-pane, Lo-366 certified models that reduce noise and improve temperature regulation. Minimum order of five windows applies for all replacement projects.

Energy-Efficient Windows

Installation of ENERGY STAR certified vinyl windows that reduce energy costs and improve home comfort. Our selection includes Anlin, Simonton, and Monte Verde brands with advanced thermal insulation properties. All installations include lifetime product and installation warranties.

Door Installation

Professional door installation services for sliding, patio, French, and entry doors. Our team ensures proper alignment and weatherproofing for enhanced security and energy efficiency. We work with major manufacturers to provide durable, stylish door solutions.

Retrofitting

Cost-effective retrofit window installations that preserve existing structures while upgrading to modern energy-efficient models. Our process maintains original architectural details while improving thermal performance and reducing maintenance requirements.

People

Sergey

Owner

With 23 years of industry experience, Sergey oversees all installations and provides free in-home estimates. He personally trains all technicians and ensures customer satisfaction through transparent communication and quality control.

Questions

Do you offer lifetime warranties?

Yes, we provide transferable lifetime warranties covering both products and installation for all window replacements.

What areas do you service?

We primarily serve Alameda, Contra Costa, and Solano counties in the Bay Area.

What window brands do you carry?

We work with Anlin, Simonton, and Monte Verde vinyl window manufacturers for quality options.

Is there a minimum order requirement?

Yes, we require a minimum of five windows for all replacement projects.

Do you provide free estimates?

Yes, owner Sergey provides free in-home estimates with no sales pressure or deposits required.

Can you handle emergency repairs?

We address urgent issues promptly, though our standard service hours are Monday-Friday 9AM-5PM.

Reviews (6)

Write a Review

Spencer Carlsen

Jun 01, 2022 Report

We had 8 windows replaced, and the entire experience was outstanding. Sergei and team were on time for every appointment, provided a fair and competitive price, installed the windows quickly and professionally, and any follow up was handled with alacrity. I highly recommend Bestoff Windows & Construction. Services: General window replacement, Window installation

Christine Vilar

Sep 17, 2021 Report

Sergey does it all -- sales, design, and customer service. He's easy to work with, and all his recommendations for improvement on our '70s-era windows were right on point. Once we decided on the Anlin brand, he accommodated our travel schedule and was very communicative about when they would be delivered. They ended up installing them before we went out of town, but a major hiccup happened when Anlin provided the wrong size of the kitchen window. Sergey's crew had to board it up, and we waited around two weeks before the right size finally arrived. Sergey was apologetic and communicative through the process, these things happen.

On installation day, the Bestoff crew was extremely efficient and fast! They cleaned up everything and installed all windows, sliding doors and screens very nicely. We're so happy with the result and HIGHLY RECOMMEND Bestoff Windows. Great quality and value.

Stacie Teller

Jul 26, 2021 Report

We replaced 9 windows. His price was very reasonable and the crew was professional and detailed. I referred them to a family member who used them as well. I liked that the owner was local and had raised his family locally. Sergey was kind, not pushy when leaving the bid, which I really appreciated. The quality of the install was great. We chose the Anlin. Definitely have this company give give you a quote. You will most likely not have to shop any further. Whole experience was so smooth and peaceful. Thanks Bestoff team! From the Teller/Townsend Team, Walnut Creek

W. W.

Apr 25, 2021 Report

Sergey was professional, courteous, and flexible. We installed during the pandemic. The team were very safe, used proper social distancing, and masks. Open to my feedback and remarks. Finished quicker than what I was quoted, and came back when a few minor items needed attention. Would use again without hesitation Service: Window installation

Aram N.

Dec 19, 2020 Report

Great price. Sergie took the time to talk through the job and window options. The crew was efficient and clean.

Jumm P.

Feb 07, 2020 Report

Extremely happy! It was truly a great pleasure to work with Sergey! He is friendly, extremely knowledgeable, reliable and clearly cared about his customers. His honesty is very refreshing and we felt that we can wholeheartedly trust him. He didn't push the high price products just to sell but he listened and provide products that fit your needs and expectation. We are very impressed with the quality of the windows and doors and the expertise of the installation crews. We ended up replacing all windows and doors at a very reasonable price! Highly recommended!