Top-rated second story addition builders.

Get matched with top second story addition builders in Port Jefferson, NY

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Second story addition builders in Port Jefferson

Giuliano's Landscaping & Design Corp.

116 Lake Avenue
4.88(
8
)
•Approved Pro

Giuliano's Landscaping & Design Corp.

116 Lake Avenue
4.88(
8
)
•Approved Pro
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
254 local quotes requested

We are your local landscape professionals and we are proud to offer innovative outdoor design services, quality installation, and ongoing lawn and garden care. Give us a call today for a personalized and complimentary consultation.

"I never write reviews but Charles and his guys did such a great job on my backyard clearing, driveway and walk that I had to do it. From start to finish the job was done professionally and they delivered on every promise. I highly recommend Giulianos for any work you may meed done."

Robert G on August 2023

We are your local landscape professionals and we are proud to offer innovative outdoor design services, quality installation, and ongoing lawn and garden care. Give us a call today for a personalized and complimentary consultation.

"I never write reviews but Charles and his guys did such a great job on my backyard clearing, driveway and walk that I had to do it. From start to finish the job was done professionally and they delivered on every promise. I highly recommend Giulianos for any work you may meed done."

Robert G on August 2023

Avatar for Islandwide Contracting

Islandwide Contracting

2226 1st Ave
5.00(
3
)
•Approved Pro

Islandwide Contracting

2226 1st Ave
5.00(
3
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
581 local quotes requested

​At Islandwide Contracting LLC, we have been proudly serving Suffolk County and surrounding areas since 2019, bringing over 30 years of combined experience to every project. Our comprehensive range of residential and commercial construction services includes interior and exterior work, such as medical offices, restaurants, urgent care facilities, dormers, and extensions. We specialize in bathroom and kitchen renovations, as well as basement transformations. Contact us today for a free estimate at 631-779-9277, and let us help you build the dream you envision. ​**At Islandwide Contracting, we deeply appreciate the dedication and sacrifices of our military personnel, first responders, and senior citizens. As a token of our gratitude, we are proud to offer special discounts tailored specifically for these esteemed groups. Please inquire about these exclusive offers when you contact us, and let us assist you in bringing your vision to life.**

"Excellent. Workers were neat respectful and I was very happy with the results I will be using the company again for any work needed in my home."

Cathy V on June 2025

​At Islandwide Contracting LLC, we have been proudly serving Suffolk County and surrounding areas since 2019, bringing over 30 years of combined experience to every project. Our comprehensive range of residential and commercial construction services includes interior and exterior work, such as medical offices, restaurants, urgent care facilities, dormers, and extensions. We specialize in bathroom and kitchen renovations, as well as basement transformations. Contact us today for a free estimate at 631-779-9277, and let us help you build the dream you envision. ​**At Islandwide Contracting, we deeply appreciate the dedication and sacrifices of our military personnel, first responders, and senior citizens. As a token of our gratitude, we are proud to offer special discounts tailored specifically for these esteemed groups. Please inquire about these exclusive offers when you contact us, and let us assist you in bringing your vision to life.**

"Excellent. Workers were neat respectful and I was very happy with the results I will be using the company again for any work needed in my home."

Cathy V on June 2025

Avatar for Kitchen & Bath Works INC

Kitchen & Bath Works INC

1551 LIincoln Ave
5.00(
101
)
•Approved Pro

Kitchen & Bath Works INC

1551 LIincoln Ave
5.00(
101
)
•Approved Pro
Customers say: Quick response
Recommended by 99% of Angi customers
Recommended by 99% of HomeAdvisor customers
565 local quotes requested

Kitchen and Bath Works Inc has been owner operated and successfully in business since 1994. Offering a consultative approach and delivering on quality, custom work, our business has been overwhelmingly driven by word of mouth referrals. From start to finish, we stand by our work and our owner is committed to being present on all jobs.

"Lou renovated my kitchen last year and I was completely satisfied. I called him back this summer to gut and remodel my bathroom. He was extremely considerate, and he treated my house as if it were his own. My house is small, and I only have one bathroom. The project took nine days. I was anticipating that there would be a big mess and a huge inconvenience. But even the demo was done very neatly and efficiently. Lou even took the time to re-connect the toilet each night so that I wouldn't be left without. Lou did an amazing job, and it was a pleasure working with him. Once again, I am pleased to recommend Lou for your kitchen or bath project."

Janet M on November 2023

Kitchen and Bath Works Inc has been owner operated and successfully in business since 1994. Offering a consultative approach and delivering on quality, custom work, our business has been overwhelmingly driven by word of mouth referrals. From start to finish, we stand by our work and our owner is committed to being present on all jobs.

"Lou renovated my kitchen last year and I was completely satisfied. I called him back this summer to gut and remodel my bathroom. He was extremely considerate, and he treated my house as if it were his own. My house is small, and I only have one bathroom. The project took nine days. I was anticipating that there would be a big mess and a huge inconvenience. But even the demo was done very neatly and efficiently. Lou even took the time to re-connect the toilet each night so that I wouldn't be left without. Lou did an amazing job, and it was a pleasure working with him. Once again, I am pleased to recommend Lou for your kitchen or bath project."

Janet M on November 2023

Avatar for Classic Remodeling Group Inc

Classic Remodeling Group Inc

1839 Bellmore Ave
4.77(
47
)
•Approved Pro

Classic Remodeling Group Inc

1839 Bellmore Ave
4.77(
47
)
•Approved Pro
Customers say: Super punctual
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers
2120 local quotes requested

Full service remodeling, roofing and siding contractors serving Long Island. Whether you are in need of new roof installation, roof restoration, or roof repairs; new siding installation, siding repairs; new windows & doors installation; kitchen remodeling; bathroom remodeling; we are the Long Island home remodeling contractors to call, due to our professionalism and affordability.

"John and his guys are the best! They were always on time, communicated and delivered everything they promised. Such a pleasure dealing with this company. Thanks again for my beautiful home!!"

Guido C on September 2025

Full service remodeling, roofing and siding contractors serving Long Island. Whether you are in need of new roof installation, roof restoration, or roof repairs; new siding installation, siding repairs; new windows & doors installation; kitchen remodeling; bathroom remodeling; we are the Long Island home remodeling contractors to call, due to our professionalism and affordability.

"John and his guys are the best! They were always on time, communicated and delivered everything they promised. Such a pleasure dealing with this company. Thanks again for my beautiful home!!"

Guido C on September 2025

Avatar for JBL HOME IMPROVEMENTS INC

JBL HOME IMPROVEMENTS INC

PO BOX 584
4.67(
257
)
•Approved Pro

JBL HOME IMPROVEMENTS INC

PO BOX 584
4.67(
257
)
•Approved Pro
Customers say: Quality work
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
871 local quotes requested

JBL Home Improvements, Inc, located in St. James, is a family owned and operated remodeling business specializing in residential projects. Owner & Contractor David Kaplan, General Manager Jill Kaplan, along with their team of talented professionals, are dedicated to providing outstanding workmanship and customer service to homeowners who live in their community.

"I am very pleased with my remodel. Dave was professional and his crew were on time, worked every day and took care of my house like it was their own!"

Jennie D on July 2025

JBL Home Improvements, Inc, located in St. James, is a family owned and operated remodeling business specializing in residential projects. Owner & Contractor David Kaplan, General Manager Jill Kaplan, along with their team of talented professionals, are dedicated to providing outstanding workmanship and customer service to homeowners who live in their community.

"I am very pleased with my remodel. Dave was professional and his crew were on time, worked every day and took care of my house like it was their own!"

Jennie D on July 2025

Avatar for Unlimited Contracting

Unlimited Contracting

67 East Main St
5.00(
1
)
•Approved Pro

Unlimited Contracting

67 East Main St
5.00(
1
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
109 local quotes requested

General Mason & Landscaping Contractor for over 4 generations! Family owned and operated, with the highest standard of quality. Free Estimates... Reasonable.

General Mason & Landscaping Contractor for over 4 generations! Family owned and operated, with the highest standard of quality. Free Estimates... Reasonable.

Avatar for A.S.M. Home Improvements

A.S.M. Home Improvements

3026 N Ocean Ave
5.00(
7
)
•Approved Pro

A.S.M. Home Improvements

3026 N Ocean Ave
5.00(
7
)
•Approved Pro
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
1466 local quotes requested

We are family owned and operated with over 25 years experience remodeling homes. We pride ourselves on offering a quality product and professional service tailored to your needs. Take a look at our previous work and contact us to discuss your next remodeling project today!.

"I used K&A Home Repairs to rebuild my deck. I found them to be dependable, professional and experienced for what I needed. Anthony came at the appointment time to provide a fair estimate and followed the work schedule as close to the plan as He could, weather permitting. I am extremely pleased with my new deck and will be calling K&A for more projects on my home."

nick p on June 2022

We are family owned and operated with over 25 years experience remodeling homes. We pride ourselves on offering a quality product and professional service tailored to your needs. Take a look at our previous work and contact us to discuss your next remodeling project today!.

"I used K&A Home Repairs to rebuild my deck. I found them to be dependable, professional and experienced for what I needed. Anthony came at the appointment time to provide a fair estimate and followed the work schedule as close to the plan as He could, weather permitting. I am extremely pleased with my new deck and will be calling K&A for more projects on my home."

nick p on June 2022

Avatar for Unlimited Outdoor Designs

Unlimited Outdoor Designs

435 Brook Ave Unit 21
4.24(
21
)
•Approved Pro

Unlimited Outdoor Designs

435 Brook Ave Unit 21
4.24(
21
)
•Approved Pro
Customers say: Terrific value
2682 local quotes requested
12 years of experience

Unlimited Outdoor Designs, specializing in Indoor Kitchens and Baths and Basement remodels. Fencing, Decks, Railings, Concrete, and Masonry work. We are family-owned and take pride in treating our clients like family. We've built an excellent reputation for customer satisfaction by providing quick estimates, a great attention to detail, and competitive pricing.

"Was professional and got it done in a timely fashion."

Michael N on May 2024

Unlimited Outdoor Designs, specializing in Indoor Kitchens and Baths and Basement remodels. Fencing, Decks, Railings, Concrete, and Masonry work. We are family-owned and take pride in treating our clients like family. We've built an excellent reputation for customer satisfaction by providing quick estimates, a great attention to detail, and competitive pricing.

"Was professional and got it done in a timely fashion."

Michael N on May 2024

Avatar for Oscar’s complete landscaping

Oscar’s complete landscaping

Located In:
5.00(
8
)
•Approved Pro

Oscar’s complete landscaping

Located In:
5.00(
8
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
806 local quotes requested

We specialize in all phases of landscaping, hardscaping, lawn maintenance, fertilization, masonry, pool services, housecleaning and more. We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service. As an added bonus, your first week of lawn maintenance is free! Call -or- click to schedule a free estimate today!

"Eric, Oscar and crew were an absolute pleasure to work with. They are true craftsman and did a fantastic Job on my driveway. They completed the job very quickly, cleaning up at the end of each day. I give Dream Pro Care my highest recommendation!"

Ron L on October 2024

We specialize in all phases of landscaping, hardscaping, lawn maintenance, fertilization, masonry, pool services, housecleaning and more. We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service. As an added bonus, your first week of lawn maintenance is free! Call -or- click to schedule a free estimate today!

"Eric, Oscar and crew were an absolute pleasure to work with. They are true craftsman and did a fantastic Job on my driveway. They completed the job very quickly, cleaning up at the end of each day. I give Dream Pro Care my highest recommendation!"

Ron L on October 2024

Avatar for J R B & SON INC

J R B & SON INC

46 Charm City Drive
5.00(
42
)
•Approved Pro

J R B & SON INC

46 Charm City Drive
5.00(
42
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
210 local quotes requested

Over 40 years experience in remodeling bathrooms and kitchens Welcome to J R B & Son, Inc we have over 40 years experience in total bathroom renovations. We proudly provide the highest quality of service and craftsmanship for each aspect of your project. Our depth of knowledge and experience solidify our belief that customer service stands as the highest priority. We eagerly look forward to working with you, and making your vision a reality. Give us a call, text or email today, and let us get started!. I am so confident about our workmanship NO MONEY UPFONT, NO MONEY DOWN, YOU PAY ME ON COMPLETION No other contractor will do this. PLEASE READ OUR REVIEWS.

"From the moment he showed up on our first estimate he was very professional with a lot of great ideas. His price was right on target. He scheduled us in for a time he showed up at 7 AM and he worked right through the day and he finished our amazing bathroom in a few days. We were very shocked on how efficient and how clean he worked. John and his helper did an amazing job for our bathroom and we’re so happy that we found him on Angie’s list and we highly recommend them to all our friends."

James Worker w on August 2025

Over 40 years experience in remodeling bathrooms and kitchens Welcome to J R B & Son, Inc we have over 40 years experience in total bathroom renovations. We proudly provide the highest quality of service and craftsmanship for each aspect of your project. Our depth of knowledge and experience solidify our belief that customer service stands as the highest priority. We eagerly look forward to working with you, and making your vision a reality. Give us a call, text or email today, and let us get started!. I am so confident about our workmanship NO MONEY UPFONT, NO MONEY DOWN, YOU PAY ME ON COMPLETION No other contractor will do this. PLEASE READ OUR REVIEWS.

"From the moment he showed up on our first estimate he was very professional with a lot of great ideas. His price was right on target. He scheduled us in for a time he showed up at 7 AM and he worked right through the day and he finished our amazing bathroom in a few days. We were very shocked on how efficient and how clean he worked. John and his helper did an amazing job for our bathroom and we’re so happy that we found him on Angie’s list and we highly recommend them to all our friends."

James Worker w on August 2025

...
Showing 1-10 of 962
FAQs for second story addition building service projects in Port Jefferson, NY

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 Port Jefferson, NY 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
  • 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.