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 Ontario County, NY

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

"Our experience with Keystone Custom decks was beyond our expectations

and we can hardly express how pleased we are with our new deck and front porch railing, and with the service we received! They took great care of our yard and the neighbors' yards adjacent to ours and left it looking just as they had when they arrived."

- Lara Rhyner

Become a Master Host in Ontario County 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.

  • 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.

We love our new deck! The entire experience was relaxed and professional from the initial quote process with Mahlon through to the final product with Anthony and his crew of very hard workers.
The gift of wine and two etched wine glasses was a lovely finishing touch! We highly recommend Keystone Custom Decks. They are replacing my father's deck next and he can hardly wait after seeing the quality of ours!"
-Terese Genecco

We make a new deck in Ontario County 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.

"Absolutely amazing experience with Keystone Custom Decks. Truly hard working individuals with Nate and his team. Full covered deck, A-frame, beautiful finishes and could not be happier with the result. Look forward to using it for many years to come. Highly recommend using Mahlon/Nate and their teams."

- Drew Beganny

"Our deck came out as planned, it is beautiful. The Keystone team was very professional, polite and accommodating. The employees were friendly and respected our interest to socially distance while still keeping us informed of the progress and options. The workmanship was only eclipsed by their work ethic. I would highly recommend Keystone."

- Helen Kordela

"If you need a deck or porch that will be the envy of all your friends, hire Keystone to design and build something special."

- Phil Riehl

Custom Deck Builder in
Ontario County, NY

If you own a home in Ontario County or nearby, 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.
To make your dream backyard a reality, we also offer the following in Ontario County:
All these features will make your backyard dreams come true and make you a master host!

Do you love hosting people, but are frustrated with your limited space?

Keystone Custom Decks will design and build a beautiful outdoor deck and living space for you! 

You’ll be able to relax outdoors, host great parties, and be proud of your space! You may even be the envy of your neighborhood! 

At Keystone Custom Decks we design, create, and install custom decks in the greater Ontario County, NY, area! Whether you are looking for a new deck, porch, patio, pergola, an outdoor kitchen, fireplace, or water feature, we are ready to help make your outdoor space dreams happen! 

Start by scheduling an estimate for your project today! 

Ontario County, New York, nestled in the scenic Finger Lakes region, is a captivating destination known for its natural beauty, outdoor recreation, and historic charm. The county is characterized by its picturesque lakes, rolling hills, and vibrant communities. The official government website of Ontario County,, provides essential resources and information for residents and visitors alike.

Top Attractions in Ontario County, NY:

  1. Canandaigua Lake: Canandaigua Lake is one of the stunning Finger Lakes, offering boating, fishing, and relaxation along its shores. The city of Canandaigua, located on the northern tip of the lake, is a popular destination.

  2. Sonnenberg Gardens & Mansion State Historic Park: A historic estate in Canandaigua, this park features beautiful gardens, a Victorian mansion, and seasonal events.

  3. Finger Lakes Wine Country: Ontario County is part of the renowned Finger Lakes wine region, with numerous wineries and vineyards offering tastings and tours.

  4. Bristol Mountain Ski Resort: A popular winter sports destination, Bristol Mountain offers skiing, snowboarding, and breathtaking views of the surrounding region.

  5. Grimes Glen: Located in Naples, NY, this scenic hiking trail leads to waterfalls and natural pools, perfect for a refreshing swim.

  6. Cumming Nature Center: Operated by the Rochester Museum and Science Center, this nature center in Naples offers hiking trails and educational programs.

  7. Naples, NY: This charming village is known for its scenic beauty, arts community, and proximity to outdoor recreational activities.

  8. Ontario County Park at Gannett Hill: This park offers hiking trails, scenic views, and camping facilities, making it an excellent destination for nature enthusiasts.

  9. Canandaigua Lake State Marine Park: A marina and park on Canandaigua Lake, providing boating and fishing opportunities.

  10. Finger Lakes Gaming & Racetrack: A racetrack and gaming facility offering horse racing and casino gaming.

Ontario County, NY Zip Codes:

Ontario County encompasses various towns, villages, and communities, each with its own unique zip code. Some of the primary zip codes in Ontario County include 14424 (Canandaigua), 14512 (Naples), 14425 (Farmington), 14432 (Clifton Springs), 14546 (Seneca Castle), 14568 (Victor), 14564 (Victor), and more. These zip codes cover the diverse regions within Ontario County.

Ontario County, NY, is a captivating blend of natural beauty and cultural attractions. Whether you're exploring the beauty of Canandaigua Lake, savoring locally produced wines, or embarking on outdoor adventures in the Finger Lakes, Ontario County offers a welcoming and enriching experience for both residents and visitors.

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!