Room additions and ADUs (including JADUs) provide extra space, improve functionality, and increase property value. Whether you want a guest suite, rental unit, or home workspace, these additions allow you to expand your home without relocating. With the right planning and team, the project becomes well-organized and stress-free.
With landmarks like California State University San Marcos, Discovery Lake, and Double Peak Park, San Marcos homes often feature modern suburban layouts, family-focused designs, and open floor plans—perfect for room expansions and ADUs.
We offer strong local experience, detailed planning, and smooth communication for homeowners throughout San Marcos.
We discuss your ideas, examine your space, and develop a clear plan based on your needs and budget.
Our designers prepare accurate 3D visuals, architectural plans, and engineered layouts tailored to San Marcos homes.
We finalize drawings, ensure full compliance, and prepare your entire project for construction.
At Golden Shore Design and Build, we don’t just renovate Houses — we transform them into functional, beautiful spaces tailored to your lifestyle. Here’s why so many homeowners trust us with their Home remodels:
Realistic previews that show your completed space.
Accurate layouts, detailed elevations, and measurements.
Safe and compliant structural designs.
Full coordination of all essential building systems.
Plans crafted for fast approval.
Alex, Petra and the team at Golden Shore Design and Build did an excellent job on our kitchen and master bed/bath remodel. We had a very ambitious project plan, including a full gutting and remodel of the kitchen and dining room space and a full gutting and remodel of the front half of our upstairs. The kitchen came first, and took around 3 months due to some unexpected issues that arose from the original construction of our 50 year old home, and a stone cutting subcontractor that botched his end of the job and then ghosted the company. Golden Shore Design and Build immediately promised to handle a full correction of the issues that subcontractor caused at their expense, and then proceeded to follow through on the promise.
Once the kitchen was nearly finished, it was time for the upstairs. We gutted the non-structural walls in the front half of the house upstairs, and proceeded to put together a beautiful master bathroom / bedroom suite. That job took around 3 months as well, and ended up finishing a bit ahead of the original timeframe.
I won't say there were not small issues that came up throughout the process, but that is really to be expected. We are doing major construction on a 50 year old home, and living in the home the entire time. When there were imperfections that needed fixing, Alex and Petra took care of them. When there were unexpected problems that arose due to the age of the home, they gave us honest and reasonable change order quotes, and options to not break the bank.
The work that Alex, Petra and their entire team of people did really brought our dream design to life, and we are thrilled with the end results! We are even planning on having them back to do a guest bathroom that we originally left out of the scope.
Alex, Petra and the team at Golden Shore Design and Build did an excellent job on our kitchen and master bed/bath remodel. We had a very ambitious project plan, including a full gutting and remodel of the kitchen and dining room space and a full gutting and remodel of the front half of our upstairs. The kitchen came first, and took around 3 months due to some unexpected issues that arose from the original construction of our 50 year old home, and a stone cutting subcontractor that botched his end of the job and then ghosted the company. Golden Shore Design and Build immediately promised to handle a full correction of the issues that subcontractor caused at their expense, and then proceeded to follow through on the promise.
Once the kitchen was nearly finished, it was time for the upstairs. We gutted the non-structural walls in the front half of the house upstairs, and proceeded to put together a beautiful master bathroom / bedroom suite. That job took around 3 months as well, and ended up finishing a bit ahead of the original timeframe.
I won’t say there were not small issues that came up throughout the process, but that is really to be expected. We are doing major construction on a 50 year old home, and living in the home the entire time. When there were imperfections that needed fixing, Alex and Petra took care of them. When there were unexpected problems that arose due to the age of the home, they gave us honest and reasonable change order quotes, and options to not break the bank.
The work that Alex, Petra and their entire team of people did really brought our dream design to life, and we are thrilled with the end results! We are even planning on having them back to do a guest bathroom that we originally left out of the scope.
We did a full kitchen remodel plus a guest bathroom update. They suggested a few layout changes that added storage we didn't think was possible. Counters,tiles and hardware all look high-end without feeling flashy. Daily updates and a clean job site made the process easier. Results exceeded what we were hoping for.
Our dated kitchen and primary bathroom got a complete overhaul. New island, better appliances, and a really well-built shower changed how we use the house. They kept us in the loop and handled inspections without drama. House stayed livable and they wrapped up when promised. Quality of the finished work is excellent.
Our dated kitchen and primary bathroom got a complete overhaul. New island, better appliances, and a really well-built shower changed how we use the house. They kept us in the loop and handled inspections without drama. House stayed livable and they wrapped up when promised. Quality of the finished work is excellent.
We updated the kitchen and both bathrooms in our older SD house. The kitchen now has real storage and better lighting, and the bathrooms finally feel current. Tile work and cabinet installation were done carefully. They stayed on the original budget and cleaned up at the end of each day. Very happy with how everything turned out
The kitchen was cramped and the powder room was falling apart. They reconfigured both rooms and the flow of the first floor is so much better. Soft-close cabinets, a new vanity, and good lighting made a bigger difference than we expected. Project stayed organized and they finished on schedule. Recommend them if you need kitchen and bath work done right.
We chose Golden Shore Design and Build to do our master bathroom renovation after meeting with and getting quotes from five different contractors. We decided to go with them based on reviews of their previous work, the thorough and realistic explanation of how the work would be done, and also because their estimate for the work was actually lower than the others. We were dealing directly with the company owner, Alex, in getting the estimate and finalizing the contract details.
Alex provided a complimentary design concept rendering at the start and made good suggestions for the choice of materials and fixtures. It was a complete bathroom remodel (floor, walls, all fixtures, additional lighting, etc.). The work crew were polite and efficient. As with any home renovation there will be dust, however the guys were diligent in minimizing this as much as possible. Everything was done in just over two weeks, including the necessary city inspections (Alex took care of arranging those).
The bathroom came out looking beautiful, the tile work on the floor and in the tub area is gorgeous. Thankfully, no major issues cropped up when the floor and walls were opened up, and the guys devised a great solution to make the vanity fit perfectly in the slightly larger area (the original vanity was custom built during our condo's construction in 1988). Alex oversaw the progress of work with frequent job site visits and a final inspection. So, a positive experience and we now have a beautiful master bathroom. Would work with them again if another project comes up.
P. S. We had Golden Shore do some minor work in our second bathroom (fan upgrade that took some tricky installing/wiring and drywall work), and it came out looking great.
Golden shore design and build team worked efficiently while paying close attention to every kitchen remodel detail. They kept the project going as greed and were always available to answer questions. The finishes are beautiful, and the craftsmanship is outstanding. Everything was completed exactly as promised. We highly recommend if you are in San Diego
Golden shore design and build team worked efficiently while paying close attention to every kitchen remodel detail. They kept the project going as greed and were always available to answer questions. The finishes are beautiful, and the craftsmanship is outstanding. Everything was completed exactly as promised. We highly recommend if you are in San Diego
We provide complete planning, 3D modeling, and engineering for room additions, ADUs, and JADUs tailored for San Marcos homes. Contact us today for a free consultation and start expanding your home confidently.
The cost to build a 1200 sq ft ADU in California varies significantly, typically ranging from $250,000 to $400,000 or more. This wide range depends on factors like location, site conditions, design complexity, and material choices. For example, building in San Diego or Chula Vista may have different permit fees and labor rates compared to other parts of the state. A detached ADU generally costs more per square foot than a conversion. To get a precise estimate, it is essential to factor in site preparation, utility connections, and design fees. For detailed guidance on local regulations and cost breakdowns, please refer to our internal article FAQ Golden Shore Design & Build — San Diego. At Golden Shore Design and Build, we always recommend consulting with a local contractor for a customized quote.
An addition involves expanding the square footage of your primary residence, often by building out or up, to create new living space like a bedroom or family room. A JADU, or Junior Accessory Dwelling Unit, is a specific type of smaller, self-contained living unit created within the existing walls of a single-family home, typically under 500 square feet and sharing a bathroom or kitchen with the main house. The key differences lie in size, location, and permitting requirements. For a thorough breakdown of both options and how they apply to your property in San Diego, Chula Vista, National City, La Mesa or Spring Valley CA, please refer to our internal article Room Addition / ADU (JADU). Golden Shore Design and Build can help you determine which path best suits your needs.
When deciding between adding an addition or building up, the cost largely depends on your specific property and goals. Generally, building up is often cheaper because it avoids new foundation work and extensive site preparation. However, it can require significant structural reinforcement and engineering, which may increase expenses. Adding a ground-floor addition typically involves pouring a new foundation and roofing, but it offers easier access for construction. For homeowners in San Diego, Chula Vista, National City, La Mesa and Spring Valley CA, local zoning laws and soil conditions play a major role in the final cost. For more tailored insights, refer to our internal article Expert Answers To Your Top Home Renovation Questions. Golden Shore Design and Build always recommends consulting a structural engineer before deciding.
99 reviews
