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 Finger Lakes, NY

Make your dream outdoor living space by the lake 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 the Finger Lakes with a custom outdoor living space by the lake!

  • 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 a custom deck builder in the Finger Lakes for over 30 years.

Keystone Custom Decks is a superb company.  From the quality of their work, to an extreme knowledge of decks, politeness, and extremely pleasurable workforce, they have transformed our deck to an outside paradise. 
These guys are legit.  I would recommend this company to whoever is looking to build a new deck or upgrade their current one.
-Dejan Jozic

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 the 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.

"The crew was professional and friendly.  They worked fast and showed up on time.  All of them are skilled deck builders and clearly take pride in their work.  I would highly recommend Keystone."

- Kathleen Stracke

"These guys are the best!  From the initial consultation to the 3-D rendering to the permit process to the scheduling to the actual construction, Keystone made the process so easy and smooth."

- Emily Betley

"We had our new deck and patio installed by Keystone Custom Decks and they both look beautiful.  I couldn't be happier with the final product."

- David Wei

Custom Decks in
the Finger Lakes, NY

As a homeowner or cottage owner in the Finger Lakes, you want a beautiful outdoor living space that adds to the beauty of your home or lake house. 
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 in the Finger Lakes region for over 30 years.

We are a custom deck builder in Finger Lakes, NY.  We are based at the north end of Keuka Lake and service most of the Finger Lakes region.

We serve towns and lake areas including:

  • Seneca Lake area
  • Keuka Lake area
  • Cayuga Lake area
  • Canandaigua Lake area
  • Honeoye Lake area
  • Owasco Lake area
  • Skaneateles Lake area
  • Waneta Lake area
  • Lamoka Lake area
  • And many more!

If you live in or regularly visit the Finger Lakes, then you know the beauty and outdoor activities that abound in the area.  After a day doing a wine tasting, hiking through Watkins Glen State Park, or enjoying a day on the lake; come home to your dream outdoor space to relax and unwind! 

The Finger Lakes region offers so much beauty, interest, and fun for locals and tourists alike! From hiking to fishing to museums and wine tasting, this region has something for everyone. These attractions include: 

  • Clemens Center
  • Seabreeze Amusement Park 
  • Cayuga Lake Wine Trail
  • Cumming Nature Center
  • Finger Lakes Land Trust 
  • Finger Lakes National Forest
  • Buttermilk Falls 
  • Cacadilla Gorge Trail
  • Fillmore Glen State Park 
  • And so much more!

The Finger Lakes Region in New York is a beautiful place and home to the 11 lakes from which the region gets its name. These lakes are long and narrow and were formed from over-deepened glacial valleys. The lakes range significantly in size although none exceeded 3.5 miles in width. This area was once home to the Iroquois, a Native American confederacy of numerous tribes. They remained in control of the region until 1779, Sullivan Expedition.  This region was the starting place for the 19th-century Christian revival, the Second Great Awakening, and important in the Underground Railroad. 

We are happy to serve the towns and zip codes in the Finger Lakes region. 

Watkins Glen, Ithaca, Auburn, Seneca Mills, Geneseo, South Bristol, Canandaigua, Skaneateles, Penn Yan, Seneca Falls, Lodi, Hammondsport, Aurora, Geneva (city), Canandaigua, Geneva (town), Waterloo, Naples, Corning, East Syracuse, Fair Haven, Fayette

13021, 13026, 13152, 14456, 14512, 14527, 14840, 14850,14851, 14853,13027, 13031,13033,13034,13039, 13040,13043, 13045, 13050,13051, 13053, 13055, 13057, 13060,13062, 13063, 13064, 13065,13066

Brian & Kaitlin Stone:  "We had a great experience with Mahlon and his team at Keystone Custom Decks. From the initial meeting to the final touches, everything was very well executed and beautifully done. Every member of the team worked very hard and they wasted no time.

They disassembled our old deck in minutes and constructed a beautiful deck, with railings, gate, and a pergola in 2 days. Despite the quick turnaround, the work was meticulously done.

The yard was left clean and in good shape after both days of work. All employees were respectful and hard-working.

Mahlon was very attentive to his emails and responses were very quick. He really stands by his high-quality work; when there was a small issue with the gate, he immediately sent someone to our house to replace the flawed part, no questions asked. We enjoyed the nice touch at the end too with the box. The finished product is outstanding! Thank you to everyone at Keystone Custom Decks!"

Finger Lakes 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 the Finger Lakes.

We also offer the following:

All these features will make your backyard dreams come true and make you a master host!
Are you ready to start designing your dream outdoor space?

Read our FREE e-book to learn the questions you need to ask when you begin designing your dream outdoor living space!