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House Extension Professionals in Mill Valley, CA

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1,530 Professionals

Featured Reviews for House Extension Professionals in Mill Valley, CA

PatriARCH Architecture
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars6 December 2013
“My husband and I were in search of the perfect house that had to satisfy both our needs. The only thing we seemed to agree on was that the location had to be in Marin County. After almost 7 long years of renting, we finally found the perfect location on a street we were both in love with but unfortunately the house was far from what either one of us liked as it was way too small for our family of four and the one bathroom was the size of a phone booth! We then searched for an architect that would be able to give us both what we wanted and could see our vision and blend it together. After interviewing several different architects and feeling like they didn’t “get us” we moved on and were fortunate enough to have met Eric who was a referral from our real estate agent. He listened and really understood the look and feel each one of us wanted. When we saw the plans he designed for us, we were beyond delighted! He took our 1400 square foot home and turned it into a 3500 sqft. dream home that has everything we both had always wanted in the most creative and family friendly way. He put a lot of thought and care into our house and we couldn’t be happier with his brilliance, creativity, work ethic, honesty, and dedication.”
Sofiov Design
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars13 March 2023
“I have been working and collaborating with Allen for a few years. He has been helping me with my projects and helped me to create stunning renderings and designs for my clients. I truly recommend them to everyone that looks for stunning interiors & exterior deign”
Tamley Architectural Design
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars28 January 2014
“Theresa consulted with my partner and I on a home remodel. She listened to our project vision and freely shared her professional knowledge, contractor network, she provided advice on lighting, spacial design, energy saving and green materials, furniture placement in the new site and drafted master house plans. We have lived in the same house for 16+ years, but only fell in love with it a few months ago, with the help of Theresa Tamley Architectural Design.”
RaBit Design Build
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars5 April 2018
“This team was contracted to do the architectural work on an addition to my home. I sketched out the overall design. Nong listened and offered his suggestions. At the conclusion, his overall design and improvements when far beyond what I had envisioned. He walk through all the paperwork and time needed to get all the permits which allowed me time to take care of the family and talk about the new look. The project is still under construction, but I know my family and I will be happy with what we both (myself and Nong) envisioned.”
MW design Inc
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars17 July 2015
“Wow! We can't really say enough about how great Matt was to work with. We came to him after already having some pretty solid ideas, but he did a fantastic job of walking the line between respecting what we had already decided and adding some suggestions that might work better. After being frustrated with a lack of response from contractors, painters, tilers, and others involved in a remodel, it was so refreshing to find Matt and his promptness in replying to our emails. Having gotten used to having to wait a few days to hear from others, it was so great to hear back from Matt within a few hours. Matt was extremely helpful with linking us up with engineers and other subcontractors, including working with the city regarding permits and passing along some discounts that he was able to get for certain supplies. We have already recommended him to a few other friends and would not hesitate to do so again in the future.”
Y.Designs
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars28 November 2017
“2017-07-02 My husband and I had been thinking about remodeling our master bathroom for a few years, but we took our time to start it because we couldn’t find any designers we liked. However, after we had a consultation with Yuki, we had a good feeling that she would create our dream bathroom. She listened to our desires carefully and she created the design exactly how I wanted it to be. She communicated quite positively with our contractor and directed all the details of her design. Her advice was very professional and precise. Because of Yuki’s aesthetic design style, our dream bathroom turned out to be far better than we expected. We couldn’t go through the remodeling process without her. My husband and I are also planning an addition for our house in the future, and Yuki is the only person we will trust to work on our project again!”
Studio300A Architecture
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars16 November 2018
“We hired Barry because we saw the beautiful work he has done for so many of our neighbors. I am an interior designer and have worked with many architects so this was a leap for me. Barry has been a DELIGHT to work with. He is smart, professional, timely in his response, flexible, and works well with the other professionals on our project. I have found that architects are often either technical architects or design architects. Barry is a creative design architect first, but all his technical skills are excellent as well. He has done extensive drawings, worked seamlessly with all engineers and contractors, gotten our permits, and made us feel that we have a true advocate throughout the process. I would highly recommend him. You will be so happy you did!”
Ogle Design & Architecture
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars18 April 2017
“Consistently refreshing creative architectural designs. William is a unique architect that understands deeply how to create highly functional buildings that are both efficient and gorgeous. Great work and extremely professional. Highly recommend.”
Urrutia Design
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars30 November 2016
“We worked with Urrutia Design on a complete home renovation. Jason and Martha listened to our ideas and translated them into their design aesthetic. Their cohesive design runs throughout the entire house and they incorporated our family's specific needs resulting in a more usable, beautiful space. We are thrilled with our new home!”
Marc Newman Architect
House Extension Professionals in Mill Valley, CA
Average rating: 5 out of 5 stars14 March 2021
“Excellent clear and honest communication. I look forward to working with Marc in the future. I would highly recommend Marc to anyone.”
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Architect or Architectural Designer FAQs
A house extension is a construction process that involves expanding the footprint of your existing home. This could be extending outwards, either to the side or rear of the house, or upwards by adding another storey. House extensions provide extra living space and can significantly increase the value of your property.

House extensions can be categorised based on direction, structure and function. The main types include rear extensions, side return extensions, wrap-around extensions, and double or single-storey extensions. More specific ones could be kitchen extensions, loft conversions, basement conversions, garage conversions or conservatories. Select the type that best suits your property and meets your space needs, if you are unsure, speaking with a local home extension builder in Mill Valley.

Generally, house extensions are worth the investment. They provide additional living space and can dramatically increase the resale value of your home, often covering the initial investment cost. However, plan carefully and choose a reputable house extension builder to ensure a high-quality build that will add value to your property.

The cost of a house extension can vary significantly based on several factors, such as the size, complexity of the design, quality of materials used, and geographical location. However, as a rough estimate, a single-storey extension can range from £1,000 to £2,000 per square metre, whereas a two-storey extension can start at around £1,500 per square metre.

Planning a house extension involves several stages, including idea generation, design, planning permission, and construction. Consult with a house extension architect to create a design based on your needs and budget. Ensure to check with your local council about planning permissions. Finally, choose a reputable house extension builder to bring your vision to life.
Why Hire Builders on Houzz?
1,530Local Pros on Houzz Who Serve Mill Valley, CA
3,500+Total Number of Reviews Left by Homeowners
Are you considering a house extension? On Houzz, you can find an extensive selection of Mill Valley house extension professionals near you, eager to turn your vision into a reality. Whether you're planning an extra bedroom, expanding your kitchen or designing a brand-new workspace, these professionals have the skills and expertise to make your project successful. House extension professionals include architects who can draw up detailed plans and builders who will execute them to the finest standards.

Choosing a house extension professional on Houzz ensures peace of mind, knowing that you’re in safe hands. They come highly recommended with a strong track record of creating bespoke, high-quality extensions in Mill Valley in a wide range of styles and budgets. Whether planning a new kitchen extension, adding a new storey, or just wanting more living space, find your house extension solution with us.

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