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House Extension Professionals in San Francisco, CA

Expand your living space with a well-designed extension, custom built to meet your needs and preferences

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San Francisco / 50 mi
Architects & Architectural Designers
House Extensions
1 – 15 of 1,613 professionals
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1,613 Professionals

Featured Reviews for House Extension Professionals in San Francisco, CA

Trademark Architecture + Interiors
House Extension Professionals in San Francisco, CA
Average rating: 5 out of 5 stars12 February 2013
“We are currently working with Kenny on a remodel of the front half of our home, consisting of a kitchen, great room, dining room and an office. He is a pleasure to work with, is extremely thorough and has great and innovative ideas. He listens to your wants and needs, delivers a great work product and he makes the design process fun. We would recommend him without any reservations!!!!”
HEYDT DESIGNS
House Extension Professionals in San Francisco, CA
Average rating: 5 out of 5 stars21 September 2012
“Leigha Heydt was our second architect hired for our project. The first didn't work out due to lack of understanding each others goals and budget. Leigha was a breath of fresh air in every way. She took out the intimidation factor in our first remodel experience. We immediately loved her straight forward honest approach and her knowledge of building a home (she has contractor experience). She was quick at assesing our needs and got straight to work on our plans. The plans were extremely professional with meticulous details that made every process after (finding contractors, engineers, etc and getting town approval) a breeze. Leigha understood us and always steered us in a realistic direction to keep to our goal. She has a very keen eye for use of space and pleasing design... that is timeless and functional. I can not say enough about Leigha, she is very talented, a great architect. Our entire house was dated with a small, closed in kitchen and no master bedroom. Our house is absolutely fantastic now with an open big kitchen, amazing master suite and a beautiful flow throughout. We chose a more modern style that is very family friendly. Leigha was right there with every resource - websites, places to find every last detail needed in our home. Again, I can't say enough- she's an amazing architect and communicator, she's thorough, always on time, wealth of resources and the calm in what could be an overwhelming experience. She's the best!”
Mark Brand Architecture
House Extension Professionals in San Francisco, CA
Average rating: 4 out of 5 stars19 January 2013
“we worked with Mark Brand Architecture for the remodel of our house. It was a complete remodel with using different colors of stucco instead of the original wood siding. This gave the house a complete modern look. Mark suggested to use of huge windows which was only possible with using some railings. This was a smart idea. It brings the woodsy scenery inside and feels like we are living in a tree house. The inside of the house was completely gutted, some walls pulled down. Again the feeling is very modern but the materials used make it very warm. There are also a lot of details which make the house more pleasant to live in. The result is not only stunning but we love living in it.”
Marc Newman Architect
House Extension Professionals in San Francisco, 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.”
Saikley Architects
House Extension Professionals in San Francisco, CA
Average rating: 5 out of 5 stars20 May 2015
“We worked with Alexandra for a rebuild of our home, upgrading it from a 3bd/1.5 bath to a 4bd/3.5bath while adding a second floor and changing the layout of the house dramatically. We chose Alexandra based on two critical expectations: that she would be good to work with (after all, you spend countless hours with your architect on a very expensive project), and that she would share our philosophy regarding the importance of combining form and function in house design. We were very lucky to have chosen her. Alexandra indeed spent countless hours with us. She paid careful attention to our wishes and needs. She worked patiently through every detail of the house, helping us maximize not only our living space but also important functional aspects of the house. From beautifully located and proportioned stairs to storage for kids backpacks under an entryway bench and built-in cabinets to roof segments and their slopes, everything was thoughtful, detailed, and practical. Alexandra also showed great professional and personal skill in navigating the permitting process, developing a good relationship with the city’s planning department that allowed us to enjoy all the benefits of the zoning code. She was always ready to help and mediate successfully when issues inevitably came up with our contractor. She followed through with everything she said she would in an even, friendly, and professional manner. We are delighted with our home and, truth be told, also take joy in the many compliments we get from anybody who visits our home or even passes by it. Alexandra was wonderful and we can’t recommend her highly enough.”
John Lum Architecture, Inc. AIA
House Extension Professionals in San Francisco, CA
Average rating: 5 out of 5 stars3 April 2011
“We used John Lum Architecture for the complete remodel of ~1000 sq ft in San Francisco. John and team were fantastic to work with. Very creative yet good at listening to our thoughts and integrating our ideas. They understand how to both design a gorgeous contemporary space while still keeping it comfortable and livable. We depended on them with a lot of design detail recommendations such as fixtures, paint, tiles and they always had great suggestions that made the process much simpler and easy to manage. They are very professional, extremely responsive and timely. There were no surprises during the entire process including on deadlines and budgets. I would strongly recommend them.”
Tyreus Design Studio
House Extension Professionals in San Francisco, CA
Average rating: 5 out of 5 stars4 June 2015
“Christie was our architect for a very transformative remodel of our entire house. From a very dated 1970's styled house, that was built originally in the 1920's. She was everything we needed in an architect. Creative, responsive, and very professional. We would highly recommend her services.”
Sofiov Design
House Extension Professionals in San Francisco, 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”
Cline Architects
House Extension Professionals in San Francisco, CA
Average rating: 5 out of 5 stars17 February 2013
“I have known Jim Cline for over five years. In 2007, my properties were damaged in a fire. I hired Jim to help remodel one building and design the other building from the ground up. He has been exemplary throughout the entire process particularly with the issues involving the many various San Francisco city departments. I would not have been able to maneuver through those departments without his expertise. His designs are innovative and modern. He is very thorough in every aspect of the design process. He works within the budget and gives a detailed accounting of his services. I would highly recommend him.”
Nick Lee Architecture
House Extension Professionals in San Francisco, CA
Average rating: 5 out of 5 stars18 December 2013
“Nick Lee and his team at houseplans.com took us from a blank canvas for a property we purchased to a wonderful and beautiful house, guest house, barn, driveway, landscaping, and all of the other numerous things that turned our 14 acre parcel into a spectacular property. When we started, we had no electricity, no water, no septic, no driveway, no fence, no gate - just a beautiful piece of property. We did not even know where we would place the buildings on the property. Nick and his team developed the site plan, designed the house and the guest house and and placed the pool, driveway, landscaping, barn and all of the other items into a plan that flows extremely well. They followed the project through to completion and we are extremely pleased with the result. We cannot recommend this team highly enough!”
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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 San Francisco.

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?
1,613Local Pros on Houzz Who Serve San Francisco, 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 San Francisco 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 San Francisco 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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