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Addition to existing structure builders in Sammamish

Platinum General Construction LLC

6208 202nd St SW Unit 66
5.00(
6
)
•Approved Pro

Platinum General Construction LLC

6208 202nd St SW Unit 66
5.00(
6
)
•Approved Pro
Customers say: Quick response
9 years of experience
Free onsite estimate

With years in the industry here at Platinum General Construction LLC we pride our company on attention to detail, punctuality, reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. Our attention to detail is that of no other. We look forward to earning your business. Give us a call today!

"Look in pictures for my review "

Alicia G on August 2025

With years in the industry here at Platinum General Construction LLC we pride our company on attention to detail, punctuality, reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. Our attention to detail is that of no other. We look forward to earning your business. Give us a call today!

"Look in pictures for my review "

Alicia G on August 2025

Avatar for Home Care Contractors, LLC

Home Care Contractors, LLC

10634 Riverside Dr E Ste 205
4.84(
19
)
•Approved Pro

Home Care Contractors, LLC

10634 Riverside Dr E Ste 205
4.84(
19
)
•Approved Pro
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
8 years of experience

Home Care Contractors, LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Overall good experience with HCC."

Jessica B on November 2021

Home Care Contractors, LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Overall good experience with HCC."

Jessica B on November 2021

Avatar for Treiber Building, LLC

Treiber Building, LLC

19322 312th Avenue Northeast
4.94(
8
)
•Approved Pro

Treiber Building, LLC

19322 312th Avenue Northeast
4.94(
8
)
•Approved Pro
Customers say: Quick response
9 years of experience
Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"I interviewed several contractors for my addition and addition and I chose Andrew because I felt like he was straightforward with the project and the risks that come with a remodel of an 80 year old house along with the primary suite addition. Through the design phase, we never felt pressured to make decisions, but were kept informed of the timing of the project and when we needed to make decisions in order to schedule the project in a way that minimized the impact to our family. Andrew walked us through each item in the contract and worked with us to make changes to fit our budget and kept us informed on what we could expect for changes for a project like ours. Once we were out on contract, Andrew helped push permits through county and kept us informed on what we could expect for duration and timing of the project. Once the work began, Andrew and his right hand man Rod worked efficiently and coordinated the project beautifully to minimize the amount of time that we were displaced from our home. Thoughtful suggestions were made to deal with the numerous issues that come with renovating an 80 year old house and Andrew supported my questions on cost impact and the criticality of each change to keep me informed so that we could make decisions that we felt comfortable with. Andrew and his team of subcontractors were all very friendly and respectful of our family, never making myself, my wife, or 3 kids feel unsafe at any time. Even with the changes to the scope of work, Andrew and his team made good on the timeline of the project, completing everything in 3-4 months as promised when we started. The layout and design of the remodel and addition have surpassed our expectations, everything that we did has really made our home both more beautiful and more functional. I would highly recommend Treiber Building and have done so to several family members and colleagues at work. The experience was as positive as I couldâ ve hoped and the results are outstanding."

William S on April 2023

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"I interviewed several contractors for my addition and addition and I chose Andrew because I felt like he was straightforward with the project and the risks that come with a remodel of an 80 year old house along with the primary suite addition. Through the design phase, we never felt pressured to make decisions, but were kept informed of the timing of the project and when we needed to make decisions in order to schedule the project in a way that minimized the impact to our family. Andrew walked us through each item in the contract and worked with us to make changes to fit our budget and kept us informed on what we could expect for changes for a project like ours. Once we were out on contract, Andrew helped push permits through county and kept us informed on what we could expect for duration and timing of the project. Once the work began, Andrew and his right hand man Rod worked efficiently and coordinated the project beautifully to minimize the amount of time that we were displaced from our home. Thoughtful suggestions were made to deal with the numerous issues that come with renovating an 80 year old house and Andrew supported my questions on cost impact and the criticality of each change to keep me informed so that we could make decisions that we felt comfortable with. Andrew and his team of subcontractors were all very friendly and respectful of our family, never making myself, my wife, or 3 kids feel unsafe at any time. Even with the changes to the scope of work, Andrew and his team made good on the timeline of the project, completing everything in 3-4 months as promised when we started. The layout and design of the remodel and addition have surpassed our expectations, everything that we did has really made our home both more beautiful and more functional. I would highly recommend Treiber Building and have done so to several family members and colleagues at work. The experience was as positive as I couldâ ve hoped and the results are outstanding."

William S on April 2023

Greg Appert Construction

15803 Gold Bar Drive
5.00(
1
)
•Approved Pro

Greg Appert Construction

15803 Gold Bar Drive
5.00(
1
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
29 years of experience

We take great pride in our 5 plus years of experience, expertise, quality, and customer service that we provide to meet the consumer needs. It is our mission to provide excellent quality workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"I have been using their services for 10 years, and I greatly appreciate their integrity, trust, dedication, and the quality of their work. I would highly recommend them!"

Glenn B on January 2021

We take great pride in our 5 plus years of experience, expertise, quality, and customer service that we provide to meet the consumer needs. It is our mission to provide excellent quality workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"I have been using their services for 10 years, and I greatly appreciate their integrity, trust, dedication, and the quality of their work. I would highly recommend them!"

Glenn B on January 2021

J Construction, LLC

13059 109th Ave NE
4.67(
3
)
•Approved Pro

J Construction, LLC

13059 109th Ave NE
4.67(
3
)
•Approved Pro
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
6 years of experience

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

""

Andrew . on February 2020

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

""

Andrew . on February 2020

Avatar for Norsk Design Build

Norsk Design Build

14963 Northeast 95th Street
5.00(
2
)
•Approved Pro

Norsk Design Build

14963 Northeast 95th Street
5.00(
2
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
29 years of experience

Norsk Design Build offers the Seattle area the best of design, technology, craftsmanship, people and our unique design-build remodeling process to create the home of your dreams. We design your home remodeling project with care to engineer out surprises. From the moment you say "What if...", we seamlessly turn ideas into workable solutions, and build beautiful lifestyle spaces for today... and for tomorrow.

"Awesome experience -They had a great attention to detail"

Jared W on July 2020

Norsk Design Build offers the Seattle area the best of design, technology, craftsmanship, people and our unique design-build remodeling process to create the home of your dreams. We design your home remodeling project with care to engineer out surprises. From the moment you say "What if...", we seamlessly turn ideas into workable solutions, and build beautiful lifestyle spaces for today... and for tomorrow.

"Awesome experience -They had a great attention to detail"

Jared W on July 2020

Avatar for GMG Construction, Inc.

GMG Construction, Inc.

PO Box 477
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

GMG Construction, Inc.

PO Box 477
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
27 years of experience
Free onsite estimate

With over 20 years of experience, GMG Construction, Inc is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Call us today!

With over 20 years of experience, GMG Construction, Inc is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Call us today!

Fidelis Construction Inc

24 Chicago Ave
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

Fidelis Construction Inc

24 Chicago Ave
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
1 years of experience
Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

Avatar for Nomad Construction

Nomad Construction

6120 228th St SE
5.00(
4
)
•Approved Pro

Nomad Construction

6120 228th St SE
5.00(
4
)
•Approved Pro
11 local quotes requested
11 years of experience

At Nomad Construction, we specialize in high-quality residential remodeling and construction services across Washington State. With years of hands-on experience, our team is committed to delivering craftsmanship you can trust—on time and within budget. From full home renovations and kitchen remodels to additions and outdoor living spaces, we work closely with each client to bring their vision to life. Our attention to detail, clear communication, and dedication to customer satisfaction set us apart. Whether it's a small update or a large-scale project, we take pride in turning houses into dream homes. Nomad Construction is fully licensed, insured, and proud to earn the trust of homeowners through reliable service and lasting results.

"Was very organized, had easy to understand bid process. Was able to schedule in a good timely manner and delivered a great finish. Thanks for help!"

Caleb J on July 2025

At Nomad Construction, we specialize in high-quality residential remodeling and construction services across Washington State. With years of hands-on experience, our team is committed to delivering craftsmanship you can trust—on time and within budget. From full home renovations and kitchen remodels to additions and outdoor living spaces, we work closely with each client to bring their vision to life. Our attention to detail, clear communication, and dedication to customer satisfaction set us apart. Whether it's a small update or a large-scale project, we take pride in turning houses into dream homes. Nomad Construction is fully licensed, insured, and proud to earn the trust of homeowners through reliable service and lasting results.

"Was very organized, had easy to understand bid process. Was able to schedule in a good timely manner and delivered a great finish. Thanks for help!"

Caleb J on July 2025

Avatar for JL Remodeling Inc

JL Remodeling Inc

1316 137th St SE
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

JL Remodeling Inc

1316 137th St SE
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
23 years of experience

JL Remodeling, based in Lynnwood, is a trusted home renovation company specializing in kitchen, bathroom, and whole-home remodels. Our mission is to create quality products through skill, communication and customer service, while giving back to our local and out-of-country communities. Since 2001, we have been dedicated to transforming homes with quality craftsmanship and personalized design solutions. Our experienced team prioritizes client satisfaction, working closely with homeowners to bring their visions to life. From initial consultation to final touches, JL Remodeling ensures a seamless and enjoyable remodeling experience, enhancing the beauty and functionality of every space.

JL Remodeling, based in Lynnwood, is a trusted home renovation company specializing in kitchen, bathroom, and whole-home remodels. Our mission is to create quality products through skill, communication and customer service, while giving back to our local and out-of-country communities. Since 2001, we have been dedicated to transforming homes with quality craftsmanship and personalized design solutions. Our experienced team prioritizes client satisfaction, working closely with homeowners to bring their visions to life. From initial consultation to final touches, JL Remodeling ensures a seamless and enjoyable remodeling experience, enhancing the beauty and functionality of every space.

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FAQs for addition to existing structure building service projects in Sammamish, WA

Yes, hidden rooms are legal, as long as they meet all local building regulations. If you sell your house, most states require homeowners to disclose full houseplans, which would include any hidden rooms.

If your secret room is a safe room, it should contain a means of communication aside from a cell phone, such as a shortwave radio. You should also have plenty of drinking water, a portable generator, emergency food supplies, blankets, pillows, flashlights, batteries and a first aid kit.

Any time you update your home’s square footage, you increase its value, but a secret room is a niche feature that doesn't rank high on every buyer’s list of must-haves. Investing your money in remodeling more common living areas like bedrooms, bathrooms, or kitchens will have a higher ROI than adding a secret room. Many secret rooms can act as entertainment spaces (think a game room or wine cellar) or quiet spaces (a library or study), so when building your secret room you may want to consider its versatility for when you’re ready to sell.

The Sammamish, WA homeowners’ guide to addition to existing structure building services

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

See all articles
  • A renovated kitchen with a waterfall island

    HomeAdvisor’s DIY Kitchen Remodel Cost Guide looks at the cost of buying supplies and doing the work yourself. Find the key cost factors and how to cut expenses.

  • Secret room within bookcase

    HomeAdvisor's expert guide walks you through the cost to build a secret room, whether you're creating a safe room for security or a fun space to fulfil your childhood fantasies. Use this guide to help plan your secret room project and explore room, concea

  • outdoor patio bar

    Explore the cost to build a bar in your home and learn how materials, wet vs. dry bars, and labor costs influence the total price of your project.