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 Geneva, NY

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

“We LOVE our new deck

with an outdoor kitchen and fireplace!”

- Megan & Dave Johnson

Become a Master Host in Geneva with a New Backyard Deck

  • 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.

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    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.

“I've never dealt with a contractor that was so responsive, and stuck to their timeline. They came every morning and told us the schedule and stuck to it.

They went above and beyond, and answered all our questions through the process and revised the project when we asked. We highly recommend Keystone for any outdoor projects."

-Kyle and Agatha Edkin

We make a new deck in Geneva 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.

"Fantastic quality. great service. great materials. very nice details you don't normally see in a deck. I would highly recommend them and would definitely use them again!!!!"

- Elizabeth Gilbert

"These guys are the definition of professional. Always on time, always communicating, always respectful. We did a 1,000SQF composite deck with a screened in section, heaters, lighting, cable railing...the works and it all came out awesome. The attention to detail was incredible. You'll never hear a curse word or see a cigarette butt in your yard. We had the pleasure of having Anthony and Ernest as the primary foremen, but the whole team is incredible. I was honestly sad to see them go because it was such a pleasure to watch their progress! Strongest recommendation of any company I've worked with over the years on home projects!"

- Trevor DiMarco

"After years of envisioning an outside area to enjoy views of our beautiful lake, Keystone Custom Decks made it happen! During the design phase, they provided a unique solution for the stairs and additional insights that we may not have thought of ourselves. Visually seeing the design in a 3-D format helped with fine-tuning of what we wanted. When it came to the actual construction, their expertise, precision and craftmanship was also stellar. We enjoyed everyone that worked on our job and it was evident that they also enjoyed working with each other."

- Ginny Turner

Custom Deck Builder in
Geneva, NY

If you own a home in Geneva or along Seneca 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 Geneva, NY.  We serve all homes in the City of Geneva, along Seneca Lake, and the surrounding areas.

If you live in Geneva or nearby, you know how much there is to do in the city and along the lake.  After spending a day exploring downtown Geneva, enjoying nature and the breezes of Seneca Lake, or watching the kids splash and play at Seneca Lake State Park; come home to your dream outdoor space to relax and unwind! 

Geneva, New York, is a charming city located at the northern tip of Seneca Lake in the Finger Lakes region. Known for its scenic beauty, historic architecture, and vibrant cultural scene, Geneva offers a diverse range of attractions and activities for residents and visitors alike. The city is celebrated for its picturesque lakefront, prestigious colleges and universities, and a thriving wine and culinary scene. The official government website of Geneva provides valuable information and resources for residents and visitors.

Seneca Lake is a central feature of Geneva's landscape and recreational opportunities. The lakefront area includes a beautiful pier and park with walking paths, picnic areas, and opportunities for swimming and boating. Visitors can take leisurely strolls along the shore, enjoying stunning lake views and sunsets.

Geneva's rich history is reflected in its museums and historical sites. The Rose Hill Mansion, a Greek Revival-style mansion, offers guided tours that provide insights into 19th-century life and architecture. The Geneva History Museum showcases the city's past through exhibits and artifacts.

In addition to Geneva's local attractions, the Finger Lakes region offers numerous points of interest. Here are some top-rated attractions and landmarks in the area according to TripAdvisor:

  1. Finger Lakes Wine Country - A renowned wine region with numerous wineries and vineyards. Website:

  2. Seneca Lake Wine Trail - A popular wine trail with wineries and stunning lake views. Website:

  3. Watkins Glen State Park - A scenic state park with gorge trails, waterfalls, and lush vegetation. Website:

  4. Sonnenberg Gardens & Mansion State Historic Park - A historic estate with beautiful gardens and a Victorian mansion in Canandaigua. Website:

  5. Taughannock Falls State Park - Home to one of the highest waterfalls in the eastern United States, with hiking trails and scenic viewpoints. Website:

  6. Montezuma National Wildlife Refuge - A wildlife refuge with walking trails and birdwatching opportunities. Website:

  7. Women's Rights National Historical Park - A historic park in Seneca Falls dedicated to the women's suffrage movement. Website:

  8. Grimes Glen - A scenic hiking trail leading to waterfalls and natural pools for swimming in Naples, NY. 

  9. Corning Museum of Glass - A museum in Corning, NY, showcasing glass art and glassblowing demonstrations. Website:

  10. High Falls - A scenic waterfall and historic district in downtown Rochester. 

For more information about Geneva, its attractions, and community resources, please visit the official government website of Geneva:

The zip code for Geneva, NY, is typically 14456.

Pat:  What can I say... QUALITY & SERVICE! This is the second deck we've had built with Mahlon and Keystone Custom Decks, and we're even happier this time around.

To see what they've grown into is Amazing, but not so surprising. When you love what you do, and you genuinely like to take care of people, being successful is a by-product!

The experience is wonderful! Mahlon really hears you in the consultation, what you like, what you want, and what you need... he always hits the goal of making you happy and meeting the budget. 

Then come Anthony and the guys! WOW! They are AMAZING! The "on the job" communication and teamwork is superb.

From the moment they arrive each day until they leave, their focus and goal are to "deliver the promise" that Maholn makes when you first sign. There's no crazy stuff either, no cursing, no cigarette butts to pick up, my wife even said she definitely felt safe and comfortable with the guys working here (we've had other experiences).

Just all in all, this is a great company that does great quality work! God Bless Keystone Custom Decks!

Ed & Claudine: We cannot praise Keystone Custom Decks enough. The whole process was seamless. Mahlon took our vision and made it reality. The entire crew was exceptional. They were so professional, hard working and meticulous with everything from big decisions to the smallest details. We would highly recommend them and would definitely hire them again for any future projects. 

John: We are absolutely thrilled with the front and back decks that Keystone built for us! From the design process with Mahlon to the crews who worked tirelessly each day to complete the process, Keystone is definitely a professional and skilled contractor. They answered any question or concern we had as the project progressed and the finished product is just beautiful! I would recommend Keystone above all others without hesitation.

Geneva 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 Geneva.

We also offer the following:

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