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Find Second story addition builders in Winnetka

Avatar for So Cal Builders & Design Inc

So Cal Builders & Design Inc

4.60(
223
)
•Approved Pro

So Cal Builders & Design Inc

4.60(
223
)
•Approved Pro
Customers say: Quality work
4813 local quotes requested
43 years of experience

So Cal Builders & Design have been helping the homes throughout California look perfect one nail and brick at a time! With the best prices and highest standard of service, we can deliver the kitchen or bathroom of your dreams on time and on budget! Our staff of trained technicians will build your addition or remodel to your specifications; using only the finest quality materials and the most up-to-date building procedures. We also have in house masonry service as well as perform a number of other services such as plumbing, lighting, painting, patios, and much more. Because we do it all ourselves, we eliminate miscommunication, stress and down time. We don’t use outside contractors or fancy gimmicks to get our customers. We combine new and modern building practices with tried and true hard work to deliver a work of art every time and that is why our customers make us #1. Request Your Free Estimate Voice Star: (888) 284-9122.

"Very good company . I am very satisfied with their professionalism . Highly recommended this company"

Leta W on December 2025

So Cal Builders & Design have been helping the homes throughout California look perfect one nail and brick at a time! With the best prices and highest standard of service, we can deliver the kitchen or bathroom of your dreams on time and on budget! Our staff of trained technicians will build your addition or remodel to your specifications; using only the finest quality materials and the most up-to-date building procedures. We also have in house masonry service as well as perform a number of other services such as plumbing, lighting, painting, patios, and much more. Because we do it all ourselves, we eliminate miscommunication, stress and down time. We don’t use outside contractors or fancy gimmicks to get our customers. We combine new and modern building practices with tried and true hard work to deliver a work of art every time and that is why our customers make us #1. Request Your Free Estimate Voice Star: (888) 284-9122.

"Very good company . I am very satisfied with their professionalism . Highly recommended this company"

Leta W on December 2025

Avatar for Sentri Homes

Sentri Homes

New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

Sentri Homes

New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
1292 local quotes requested
2 years of experience

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.

Avatar for William Joyce Design

William Joyce Design

5.00(
3
)

William Joyce Design

5.00(
3
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

William Joyce Design is a Landscape Architecture firm dedicated to creating imaginative, functional, & attractive landscapes that elicit lasting responses & are intrinsic to the local environmental conditions. As each site poses its own questions & offers its unique subtleties, we use our own broad-reaching cultural experiences & expansive education to embrace natural systems, feed our imagination, & reinforce the instincts of our designs. By committing to stewardship of the land, responsible use of natural resources, incorporation of local materials & native plants, & appreciation of the physical interaction with the landscape, William Joyce Design seeks uncontrived, natural solutions designed to generate discovery, splendor, & balance.

William Joyce Design is a Landscape Architecture firm dedicated to creating imaginative, functional, & attractive landscapes that elicit lasting responses & are intrinsic to the local environmental conditions. As each site poses its own questions & offers its unique subtleties, we use our own broad-reaching cultural experiences & expansive education to embrace natural systems, feed our imagination, & reinforce the instincts of our designs. By committing to stewardship of the land, responsible use of natural resources, incorporation of local materials & native plants, & appreciation of the physical interaction with the landscape, William Joyce Design seeks uncontrived, natural solutions designed to generate discovery, splendor, & balance.

Tri County Electric

No reviews yet

Tri County Electric

No reviews yet
41 years of experience

We are electrical contractors established in 1984 with over 50 years combines experience in our upper management alone. State contractoer Licence # 526519

We are electrical contractors established in 1984 with over 50 years combines experience in our upper management alone. State contractoer Licence # 526519

Avatar for System Pavers

System Pavers

4.89(
45
)

System Pavers

4.89(
45
)
Customers say: Quality work
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers

System Pavers is the nation’s leading outdoor remodeling company, thanks to award-winning customer service and more than 30 years of experience behind every install. With every project backed by industry-leading warranties, over 90,000 homeowners have trusted System Pavers to create beautiful, easy-to-maintain outdoor spaces where family and friends can connect for generations. System Pavers’ visionary designers and expert installation teams specialize in hardscapes, patios, driveways, turf, outdoor kitchens, BBQ islands, water features, fire features, decking, and more.

"A year and a half ago, we hired System Pavers to redo our driveway: changing it from stamped concrete to pavers. At the time, we knew we wanted to do the same thing to our back patio, but we figured it would be smart to try them out on a somewhat smaller project first, and then tackle the much larger and more complicated back yard once we knew we were satisfied. (Back yard is ~2,000 sq ft.) Needless to say, we were delighted with the work they did in 2019, and therefore asked to have the same project manager (Jimmy Jackson) again this year. That said, Jimmy had a long weekend planned out of town during our project, but things continued without a hitch, with Rich Daugherty stepping in to cover in Jimmy's absence -- absolutely seamless service! The project started ~2 weeks ago, and was completed in only 10 working days, including one Saturday (at our request -- so as to get the noisy jack hammering all done in as few business days as possible). Note that my husband had delayed moving forward on this project because he guessed it would take them a minimum of 4 weeks to complete it, with at least 2 weeks of jack hammering the old concrete. Wrong! It was more like 3 days of demo, followed by 7 days of construction -- and the demo all had to be done by hand: there was no way for a bobcat to access our back yard, so the guys used jack hammers and wheelbarrows to remove all that concrete. They are are FAST! They are also artisans: our house is of modern design, so the pool and back patio have lots of corners, which were mitred beautifully. They also added drainage to the patio, thereby solving a prior problem. The detail work was simply awesome! Any question we raised, they addressed, and we saw Jimmy or Rich here daily, ensuring that everything was picture perfect. Believe me, if/when we have any other hardscape that needs attention, we will call them again!"

Susanne H on July 2020

System Pavers is the nation’s leading outdoor remodeling company, thanks to award-winning customer service and more than 30 years of experience behind every install. With every project backed by industry-leading warranties, over 90,000 homeowners have trusted System Pavers to create beautiful, easy-to-maintain outdoor spaces where family and friends can connect for generations. System Pavers’ visionary designers and expert installation teams specialize in hardscapes, patios, driveways, turf, outdoor kitchens, BBQ islands, water features, fire features, decking, and more.

"A year and a half ago, we hired System Pavers to redo our driveway: changing it from stamped concrete to pavers. At the time, we knew we wanted to do the same thing to our back patio, but we figured it would be smart to try them out on a somewhat smaller project first, and then tackle the much larger and more complicated back yard once we knew we were satisfied. (Back yard is ~2,000 sq ft.) Needless to say, we were delighted with the work they did in 2019, and therefore asked to have the same project manager (Jimmy Jackson) again this year. That said, Jimmy had a long weekend planned out of town during our project, but things continued without a hitch, with Rich Daugherty stepping in to cover in Jimmy's absence -- absolutely seamless service! The project started ~2 weeks ago, and was completed in only 10 working days, including one Saturday (at our request -- so as to get the noisy jack hammering all done in as few business days as possible). Note that my husband had delayed moving forward on this project because he guessed it would take them a minimum of 4 weeks to complete it, with at least 2 weeks of jack hammering the old concrete. Wrong! It was more like 3 days of demo, followed by 7 days of construction -- and the demo all had to be done by hand: there was no way for a bobcat to access our back yard, so the guys used jack hammers and wheelbarrows to remove all that concrete. They are are FAST! They are also artisans: our house is of modern design, so the pool and back patio have lots of corners, which were mitred beautifully. They also added drainage to the patio, thereby solving a prior problem. The detail work was simply awesome! Any question we raised, they addressed, and we saw Jimmy or Rich here daily, ensuring that everything was picture perfect. Believe me, if/when we have any other hardscape that needs attention, we will call them again!"

Susanne H on July 2020

Team Ridamite

5.00(
3
)

Team Ridamite

5.00(
3
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

additional email: april@teamridamite.com

additional email: april@teamridamite.com

AAA Construction

1.00(
1
)

AAA Construction

1.00(
1
)
Customers say: Quick response

If your house is falling apart around you and you don t know what to do, give us a call. We can repair your home and keep everyone in it happy.

"Don’t use Triple A Air Conditioning & Construction! Also AAA Construction same company Zee Armand (AKA Zahid Hussain) of Triple A Air Conditioning & Construction took our deposit didn’t do the work and left the siding off our house! We found Zee Armand (AKA Zahid Hussain) on Porch.com and asked him to give us an estimate on removing some dry rot, replacing a shower in our guest bathroom and installing some sheet vinyl in both the guest and master bathrooms. The estimate for the shower seemed reasonable, but for the flooring he was charging over $20 per square foot and we had already purchased the flooring ourselves. From Home Advisor: Installing sheet vinyl costs around $3/sf. Installing luxury vinyl tiles (LVT) or planks (LVP) costs considerably more, hovering at $7 per sq. ft.. Zee was the third contractor we had out to look at the bathroom and so by that point we were stressed and frustrated and after negotiating the flooring price down, we still decided to use his services and paid him a 10% deposit of $500. He was then supposed to come over the next day with his helper to look at the job and determine the tools they would need. He cancelled due to rain and said he would start on Monday instead. He arrived on Monday with his helper, took off a couple pieces of the siding of our house to expose the dry rot and told us that he was going to Home Depot to get supplies and update the estimate. He said he would be back in the afternoon and around 2:00 he still wasn’t back yet, so we contacted him to find out what was going on. At that point he proceeded to tell us that because of the little bit of mold that was there, that if a mold remediation team came out to remove it would cost us over $5000, but that he could do it for $1550. At that point we cancelled the job and demanded that he return our deposit. Long story short, he never gave us our $500 deposit back. Upon further investigation it was found that he has had numerous small claims judgments against him. He is also operating without a Home Improvement certification and isn’t certified to remove mold!"

Amy R on February 2019

If your house is falling apart around you and you don t know what to do, give us a call. We can repair your home and keep everyone in it happy.

"Don’t use Triple A Air Conditioning & Construction! Also AAA Construction same company Zee Armand (AKA Zahid Hussain) of Triple A Air Conditioning & Construction took our deposit didn’t do the work and left the siding off our house! We found Zee Armand (AKA Zahid Hussain) on Porch.com and asked him to give us an estimate on removing some dry rot, replacing a shower in our guest bathroom and installing some sheet vinyl in both the guest and master bathrooms. The estimate for the shower seemed reasonable, but for the flooring he was charging over $20 per square foot and we had already purchased the flooring ourselves. From Home Advisor: Installing sheet vinyl costs around $3/sf. Installing luxury vinyl tiles (LVT) or planks (LVP) costs considerably more, hovering at $7 per sq. ft.. Zee was the third contractor we had out to look at the bathroom and so by that point we were stressed and frustrated and after negotiating the flooring price down, we still decided to use his services and paid him a 10% deposit of $500. He was then supposed to come over the next day with his helper to look at the job and determine the tools they would need. He cancelled due to rain and said he would start on Monday instead. He arrived on Monday with his helper, took off a couple pieces of the siding of our house to expose the dry rot and told us that he was going to Home Depot to get supplies and update the estimate. He said he would be back in the afternoon and around 2:00 he still wasn’t back yet, so we contacted him to find out what was going on. At that point he proceeded to tell us that because of the little bit of mold that was there, that if a mold remediation team came out to remove it would cost us over $5000, but that he could do it for $1550. At that point we cancelled the job and demanded that he return our deposit. Long story short, he never gave us our $500 deposit back. Upon further investigation it was found that he has had numerous small claims judgments against him. He is also operating without a Home Improvement certification and isn’t certified to remove mold!"

Amy R on February 2019

Aim Landscape & Irrigation

4.86(
14
)

Aim Landscape & Irrigation

4.86(
14
)
Customers say: True professional
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers

Full Commercial & Residential Landscape Installation & Maitenance. License, Bonded & Insured. From design to installation to maintenance we have been serving the Los Angeles/Santa Clarita area since 1995'. Additional email- info@aimlandscape.com

Full Commercial & Residential Landscape Installation & Maitenance. License, Bonded & Insured. From design to installation to maintenance we have been serving the Los Angeles/Santa Clarita area since 1995'. Additional email- info@aimlandscape.com

OCDesignerSource.com

No reviews yet

OCDesignerSource.com

No reviews yet
17 years of experience

We are interior designers with strengths in construction and application. We tailor our services to reflect our client’s needs and concerns evolving their vision into an environment for the workplace or home. We have a special niche in which we mentor and work with a team of talented artists to produce artwork and photography customized for any environment. Our company collaborates with our alliances to produce artful environments left only to the imagination. Our artist’s are available for licensing for any project. We have unique pricing programs so that each client who comes across our path has the opportunity to work with us. Interior Designers bring value to your project in safety, codes, beauty and knowledge, avoiding costly mistakes. Projects are always expensive so isn’t your project worth total satisfaction with a professional who knows how to help you get it?

We are interior designers with strengths in construction and application. We tailor our services to reflect our client’s needs and concerns evolving their vision into an environment for the workplace or home. We have a special niche in which we mentor and work with a team of talented artists to produce artwork and photography customized for any environment. Our company collaborates with our alliances to produce artful environments left only to the imagination. Our artist’s are available for licensing for any project. We have unique pricing programs so that each client who comes across our path has the opportunity to work with us. Interior Designers bring value to your project in safety, codes, beauty and knowledge, avoiding costly mistakes. Projects are always expensive so isn’t your project worth total satisfaction with a professional who knows how to help you get it?

Meir Construction

No reviews yet

Meir Construction

No reviews yet

Specialize in all roof and roofing related needs only. We do new construction, residential and commercial roofs, shingles, tile, slate, flat roof, torch down and hot mop.We provide most of the resid

Specialize in all roof and roofing related needs only. We do new construction, residential and commercial roofs, shingles, tile, slate, flat roof, torch down and hot mop.We provide most of the resid

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FAQs for second story addition building service projects in Winnetka, CA

For many homeowners, building up is worth the expense because it provides the extra bedrooms or living areas that can’t be accommodated within the existing footprint. A larger, updated home often commands a higher resale price, recouping a sizable share of the project cost while allowing you to stay in the neighborhood you love. Run the numbers with a real estate agent and contractor to ensure the expected return and day-to-day benefits align with your goals.

Whether it makes more sense to build up or out depends on your lot, budget, and local code. Building up preserves yard space and involves less foundation work, but you may need to vacate the home during construction. Building out avoids staircases and can proceed while you stay put; however, it encroaches on the yard and may face setback limits. Compare both options with your contractor before making a decision.

A structural engineer will first inspect the existing foundation for cracks, footings, and load capacity. Depending on the findings, the crew may pour new concrete footings, install steel or concrete piers, add reinforced beams, or tie additional rebar into the slab. These upgrades redistribute the weight of the new floor and bring the structure up to code. Your contractor will outline the specific reinforcement plan and timeline once the engineering report is complete.

The Winnetka, CA homeowners’ guide to second story addition building services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles