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Find Addition to existing structure builders in Columbus

Avatar for Catalyst Custom Construction

Catalyst Custom Construction

5.00(
8
)
•Approved Pro

Catalyst Custom Construction

5.00(
8
)
•Approved Pro
Customers say: Quality work
40 local quotes requested
10 years of experience

Established in 2015, Catalyst Custom Construction is the local leader in home construction, home additions, kitchen remodels, bathroom remodels, and basement finishing. We spec in homes that you can live in forever. We build new executive homes for you and your whole family with your families touches. We know Madison homes and understand when you want to keep the character in your old home with new flair. We are a building contractor that is ready to make your vision into a reality. We pride ourselves on the quality, integrity and craftsmanship that goes into every job. Give us a call or send us an email to set up a consultation about your next project!

"It went outstanding! They weren't any inconveiniece, great communication, had everything ready to go."

Scott B on March 2019

Established in 2015, Catalyst Custom Construction is the local leader in home construction, home additions, kitchen remodels, bathroom remodels, and basement finishing. We spec in homes that you can live in forever. We build new executive homes for you and your whole family with your families touches. We know Madison homes and understand when you want to keep the character in your old home with new flair. We are a building contractor that is ready to make your vision into a reality. We pride ourselves on the quality, integrity and craftsmanship that goes into every job. Give us a call or send us an email to set up a consultation about your next project!

"It went outstanding! They weren't any inconveiniece, great communication, had everything ready to go."

Scott B on March 2019

Avatar for Matrix Basement Finishing

Matrix Basement Finishing

4.54(
275
)
•Approved Pro

Matrix Basement Finishing

4.54(
275
)
•Approved Pro
Customers say: Quality work
261 local quotes requested
16 years of experience

We are a locally owned and operated basement finishing specialist servicing the Chicagoland area. Our focus is providing clients with a clear, upfront vision of expectations through a design/build approach. Our free design service provides potential customers with a collaborative consultation geared towards budget, wants, needs and lifestyle.

"The basement looks amazing, the crew did an excellent job. They were efficient, kept to their schedules, and did great work."

Matthew R on October 2025

We are a locally owned and operated basement finishing specialist servicing the Chicagoland area. Our focus is providing clients with a clear, upfront vision of expectations through a design/build approach. Our free design service provides potential customers with a collaborative consultation geared towards budget, wants, needs and lifestyle.

"The basement looks amazing, the crew did an excellent job. They were efficient, kept to their schedules, and did great work."

Matthew R on October 2025

Avatar for Interiors by JW

Interiors by JW

New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

Interiors by JW

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

At JW, we’ve been providing our customers with quality craftsmanship and innovative solutions since 1998. We’ve built our reputation on a solid foundation of integrity and trust, the cornerstones of our company’s values. Choosing to work with JW means you’re in good hands. We provide a 2-year warranty on all of our work, and you’ll receive manufacturer warranties on all the products we install. Our detailed estimating software ensures that you receive a fair quote that is accurate the first time and won’t escalate during the course of your project. We strictly adhere to all city and state requirements for licensing and insurance regulations, ensuring that we are compliant at all times. JW provides a full range of remodeling services including a full-time interior design team, to make your remodeling process as seamless as possible.

At JW, we’ve been providing our customers with quality craftsmanship and innovative solutions since 1998. We’ve built our reputation on a solid foundation of integrity and trust, the cornerstones of our company’s values. Choosing to work with JW means you’re in good hands. We provide a 2-year warranty on all of our work, and you’ll receive manufacturer warranties on all the products we install. Our detailed estimating software ensures that you receive a fair quote that is accurate the first time and won’t escalate during the course of your project. We strictly adhere to all city and state requirements for licensing and insurance regulations, ensuring that we are compliant at all times. JW provides a full range of remodeling services including a full-time interior design team, to make your remodeling process as seamless as possible.

Avatar for Mad City Windows & Baths

Mad City Windows & Baths

4.82(
2,704
)
•Approved Pro

Mad City Windows & Baths

4.82(
2,704
)
•Approved Pro
Customers say: Quality work
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
2463 local quotes requested

We are the premier home improvement company in Madison, Green Bay, Milwaukee & throughout Wisconsin with years of experience and countless home improvement projects to prove it. We’re locally owned and operated so we know what works best in this climate and we choose quality products designed with Wisconsin area homeowners in mind. Whether you need replacement windows, vinyl siding, bathrooms, or metal roofing our professional installers will leave your home looking great.

"We were very happy with the finished look, as my wife wanted the new cabinets to match our existing wood trim."

Dennis M on June 2025

We are the premier home improvement company in Madison, Green Bay, Milwaukee & throughout Wisconsin with years of experience and countless home improvement projects to prove it. We’re locally owned and operated so we know what works best in this climate and we choose quality products designed with Wisconsin area homeowners in mind. Whether you need replacement windows, vinyl siding, bathrooms, or metal roofing our professional installers will leave your home looking great.

"We were very happy with the finished look, as my wife wanted the new cabinets to match our existing wood trim."

Dennis M on June 2025

Avatar for Sentri Homes

Sentri Homes

New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

Sentri Homes

New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
88 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.

Majestic Oaks Fine Woodworking, LLC.

1.00(
1
)

Majestic Oaks Fine Woodworking, LLC.

1.00(
1
)
26 years of experience

3-5 Employees. Full shop on-site. Fabrication services available in house.

3-5 Employees. Full shop on-site. Fabrication services available in house.

Avatar for Auto Transport - United Freight Of America

Auto Transport - United Freight Of America

4.84(
920
)

Auto Transport - United Freight Of America

4.84(
920
)
Customers say: Quality work
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers

United Freight of America is your all inclusive transport solution. CONTACT US FOR A QUOTE. please include pick up and Drop off locations and vehicle information

"Excellent, no problems. My car was new the first year I used the service and there has never been any damage during the transports. The men picking up and delivering the car have always been pleasant and cooperative. Both Ely and Guy at United Transport has been highly responsive to my needs. I would highly recommend this company."

CLAUDIA H on October 2021

United Freight of America is your all inclusive transport solution. CONTACT US FOR A QUOTE. please include pick up and Drop off locations and vehicle information

"Excellent, no problems. My car was new the first year I used the service and there has never been any damage during the transports. The men picking up and delivering the car have always been pleasant and cooperative. Both Ely and Guy at United Transport has been highly responsive to my needs. I would highly recommend this company."

CLAUDIA H on October 2021

Ageless Concrete LLC

5.00(
39
)

Ageless Concrete LLC

5.00(
39
)
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Ageless Concrete is a Marine Corps Veteran Owned, Madison, WI based, Concrete Contracting Company. Founded in 2006, we specialize in colored and stamped concrete patios, driveways, walkways, stoops, and steps. In addition to stamped concrete flatwork, we specialize in traditional concrete driveways, garages, additions, pole barns, and basements. Our other services offered include: Demolition / Removals, Poured and Block Retaining Walls, Acid Stained Floors, Concrete Sealing, and Snow Removal.

"Ageless did an outstanding job! A very professional and hard-working crew. Now, over a year later, we had some issues with our fire pit not keeping lit (user issue) and Ageless provided immediate assistance to help resolve the problem. I highly recommend them!"

Steve T on July 2022

Ageless Concrete is a Marine Corps Veteran Owned, Madison, WI based, Concrete Contracting Company. Founded in 2006, we specialize in colored and stamped concrete patios, driveways, walkways, stoops, and steps. In addition to stamped concrete flatwork, we specialize in traditional concrete driveways, garages, additions, pole barns, and basements. Our other services offered include: Demolition / Removals, Poured and Block Retaining Walls, Acid Stained Floors, Concrete Sealing, and Snow Removal.

"Ageless did an outstanding job! A very professional and hard-working crew. Now, over a year later, we had some issues with our fire pit not keeping lit (user issue) and Ageless provided immediate assistance to help resolve the problem. I highly recommend them!"

Steve T on July 2022

JW Home Improvement

No reviews yet

JW Home Improvement

No reviews yet

Home Improvement and Landscape

Home Improvement and Landscape

Avatar for HLW BUILDERS LLC

HLW BUILDERS LLC

4.25(
8
)

HLW BUILDERS LLC

4.25(
8
)
Customers say: Super punctual
21 years of experience

LICENSE 957420.

LICENSE 957420.

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FAQs for addition to existing structure building service projects in Columbus, WI

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 Columbus, WI 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.

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