your Dream outdoor living space

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Improve your lifestyle
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Host Great Parties
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Increase Your Home Value

Deck Builder in Ithaca, NY

Make your dream outdoor living space a reality with a custom deck and additional features!

“We are incredibly pleased

with the outcome and excited to have this new outdoor living space to relax and spend time with the family.”

- Garret Pachtinger

 “The most professional

and understanding crew I've ever had the pleasure to be able to have work done for my family.”

- Guiseppe Troisi

“We LOVE our new deck

with an outdoor kitchen and fireplace!”

- Megan & Dave Johnson

“Dream come true.

We are over the moon happy with our new deck.”

- Angela R.

Become a Master Host in Ithaca with a custom outdoor deck and living space.

  • Group Of Happy Young Friends Having Dinner At Patio

    Host Great

    Make new and lasting memories with family and friends.

  • Home lifestyle woman relaxing enjoying luxury sofa patio furniture on outdoor patio

    Have a Place
    to Relax

    Let life’s worries behind as you enjoy the beauty of the outdoors.

  • 660460

    Be Proud
    of Your Space

     Become the envy of the neighborhood with your beautiful outdoor space.

At Keystone Custom Decks, we believe having your dream outdoor living space designed and built should be an enjoyable and painless process.

  • Do you love hosting people, but you don’t love your available space?

  • Do you enjoy spending time outdoors, but your existing outdoor space is unattractive or unusable?

  • Do you have a vision for your dream outdoor living space, but you feel overwhelmed by the construction process?

We know what it feels like to not love your outdoor living space. That is why we have been building custom decks for over 30 years.

“From pre-construction planning until the start of construction, these guys did a great job.  The sales team knew what info to offer and was not pushy at all.
When construction began, the crew was great!  Great team, great people, and a joy to work with.  Would recommend to anyone who wants a great outdoor living space."
-Mike Murphy

We make the process as easy as possible

  • 1

    Call Us

    We’ll learn more about your space and schedule an estimate.

  • 2

    Design Proposal

    Receive your quote and complimentary 3D rendering.

  • 3


    Sign your proposal and watch your dreams become reality.

  • 4


    Love your new deck and space you have to host parties and live!

3D Render Final Build
“Their 3D rendering really helped us envision what the final project would look like, and it helped guide us in making adjustments and changes to improve the functionality of the living space.”
- Lawrence Han

What you can expect with Keystone Custom Decks:

Turn-key Projects

We take care of every part of the construction process.

Lifetime Workmanship Warranty

We stand behind our work for life.


We deliver on our timeframe and proposal promises.

Financing Available

We offer financing options through our partners.

"Say what they'll do, do what they say!  On time, on schedule, on quote!  Our new deck is beautiful!  Thank you, thank you!"

- Mark Sofio

"Total class act!  The crew are simply the best!  Outstanding craftsmanship and just overall incredible guys!"

- Angelique Troisi

"Keystone recently completed a new deck with a cover for our yard, and we are so happy we chose to go with them.  They were responsive to all my questions and put up a final result that is better than I was imagining."

- Kevin McCabe

Custom Decks in
Ithaca, NY

If you are a homeowner in Ithaca, the surrounding area, or Cayuga Lake, you want a beautiful outdoor living space.  The problem is your current outdoor space might be unattractive or unused.  Keystone Custom Decks builds beautiful custom decks and outdoor living spaces so you can host great parties, make memories, and improve your lifestyle.
At Keystone Custom Decks, we know you want to create and live in your dream outdoor living space, and that is why we have been building custom decks for over 30 years.

We are a custom deck builder in Ithaca, NY.  We serve all homes in the City of Ithaca, along Cayuga Lake, and all the local areas.

Whether you live in the City of Ithaca, a nearby town, or along Cayuga Lake, you know how much there is to do in the city, college, lake, and nearby area.  After spending time in downtown Ithaca or the Farmer's Market, enjoying nature in a nearby park or Cayuga Lake, or exploring Cornell University and its vast campus; come home to your dream outdoor space to relax and unwind! 

Ithaca, NY is a lovely city situated close to Cayuga Lake. The city and surrounding areas have a lot to offer visitors and locals alike. Some of these include:

  • Buttermilk Falls State Park
  • Cornell Botanic Gardens
  • Robert Treman State Park
  • Taughannock Falls State Park
  • Ithaca Farmers Market
  • Cascadilla Gorge Trail
  • Six Mile Creek Vineyard
  • Cornell University
  • Sciencenter
  • The History Center in Tompkins County
  • and so much more!

Ithaca was settled in 1788 when a surveyor selected the site for a city. The city was named after the Greek island, Ithaca, and was selected by the surveyor's friend. The city has had a significant educational influence with the founding of Ithaca College, Tompkins Cortland Community College, and the Ivy League school, Cornell University. Industries including farming, transportation, and manufacturing had a significant influence on the city's economy. Today Ithaca is home to 30,000 people and is a popular tourist attraction for those who love nature.

We are happy to serve Ithaca, NY, zip codes 14850 and 14853, and the surrounding areas.

Kris Armstrong: "Our thanks to everyone at Keystone Custom Decks that made our dream deck come true. Thank you Mahlon for your design ideas at the start and continuing guidance throughout the project. The construction crew was always on time and ready to work. Always prepared at the beginning of the day and cleaned up at the end. They are all very experienced and like what they do. Thank you Anthony, Brandon Steve and Jason, you are true professionals.
Completed ahead of schedule, the project was well planned and expertly constructed.
We love our new space and highly recommend Keystone Custom Decks."

P: "My first words after seeing my finished deck were, "No one has ever built something so beautiful for me...!" My deck is absolutely stunning! From the first reach-out to Keystone Decks, to the final end waving goodbye to the builders when it was finished has been nothing short of professional, quality, hard working, thorough, swift...I could go on and on! Mahlon was awesome to work with, answering every single email timely, keeping communication always present, simple yet informative. When the builders showed up to start, they did nothing but work so hard from beginning to end (in the WORST weather, too!). They are sooo skilled, swift, hard-working, efficient, focused (Kevin, you and your crew are absolutely the best guys EVER...they do not pay you nearly enough!)....and the deck! WOW! Albeit, my deck is a simple 12x20' rectangle, it is the most beautiful thing "anyone has ever built for me..."! Next to it's stunning splendor, my favorite thing about it is how SOLID it is! No noise, no give or movement, the quality is top notch! I will love my deck for years to more staining, no more rotten boards to replace, no more high maintenance...just a beautiful deck to enjoy summers with my family and friends with a stunning view! Thank you Keystone......outstanding job! I highly recommend the Keystone team for your next build! Where is the 10 star button....???"

John Brisbois: "Keystone Custom Decks is the best contractor we have ever dealt with. From initial contact with Mahlon to project finish and cleanup, they were responsive and professional. It’s amazing how fast they completed our deck project along with the excellent workmanship. Kevin and the crew showed up early in the morning and all members stayed busy all day. Whenever a decision needed to be made in construction, they kept us in the loop. We will be recommending them to others and will contact them if we need something else that they can do."

Chuck Raniewicz: "Keystone Decks has to be the smoothest running operation I've seen. I hired them to build a deck and they did absolutely professional work from beginning to end. I've hired many contractors over the years as I am a landlord with several properties. Only Keystone Decks was as courteous and professional as I had hoped. From the early planning stages to the ending finalizing stages, they never disappointed me in any way. Each day, Kevin and company would show up on time (driving from over 1.5 hours away) and immediately get to work. There was a calmness about them I've not seen on any other crew. Each person knew their job and set out about it as soon as they showed up. There was great respect for the job they were doing and the interactions between the workers themselves were remarkable as they are absolutely courteous to each other (not to mention how courteous they were to us!). They were very easygoing about last-minute changes and simply focused on doing the best job possible, which they did. Mahlon was extremely patient and courteous and responded to each inquiry quickly. He actually did the initial measurements in 2 feet of snow and it never even appeared to bother him in the least. He relayed all my information and instructions to the crew without a flaw. I wish I could hire them for every contracting or building need. Every company should operate the way they do. I cannot recommend them enough. They even sent a small Thank You gift which is absolutely unheard of but was very thoughtful and appreciated. I see only great success in their future."

Priyanka Sen: "If I could give Keystone 10 stars I would. This was the most seamless process I have ever experienced with a contractor from start to finish. Mahlon was awesome when he came to do measurements and was super clear about all the different options we could get on the deck. He also helped us get to our target budget, but still have a beautiful deck. The only downside (no fault of Keystone!) was having to wait for the deck to be built because the permitting process was backlogged. But Mahlon was very honest about this in our initial meeting and still provided an accurate start date of late October/early November. They started the job on November 1st and finished the 2nd!! Now the crew - WOW. Early to the job. Worked non-stop. Cleaned up after themselves and were EXTREMELY kind and courteous. I was told this would take three days which was already very impressive. Kevin and his crew finished in 1.5 days. Their outstanding professionalism and absolutely stunning craft are impeccable. It’s clear they work really well together and that everyone has a clear and coordinated job to get things done so efficiently without sacrificing the construction or craft. They brought one truck that also had one small bulldozer on a trailer the first day, and then just a work truck the second day. This was actually really helpful as we live on a tight street. We had neighbors who used another company to do their deck and the company they hired was disrespectful, loud, and brought huge trailers that clogged up our street. The Keystone crew was the exact opposite - and got the job done in a quarter of the time!!! Keystone was awesome - professional, timely, and courteous. Best experience I have ever had with a contractor. I highly recommend using them!"

Ithaca Deck Builder

To make your dream backyard a reality, we also know that you may want more than just a deck.  That is why we offer more than just custom decks in Ithaca.

We also offer the following:

All these features will make your backyard dreams come true and make you a master host!