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

"We’ve completed many upgrades to our house in the last three years and Keystone Custom Decks was by far the best contractor we worked with. Mahlon did an excellent job of helping us design the perfect deck. He made design suggestions, provided multiple pricing options, and supplied a full-color rendition of the proposed deck."

- Mark Voigt

"I highly recommend Keystone for any deck project. These guys were nothing bud professional and courteous throughout the entire project. Rest assured you are in good hands. A++"

- Ray Davis

Become a Master Host in Ontario County 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.

Download our catalog to see everything we offer with our custom decks!

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!  After 18 years of living in our house with an awful brick patio, we decided to get a deck.  From the first meeting with sales, Keystone was timely and professional, and a great company to work with.
The project was begun even earlier than our planned schedule.  We are awaiting warm weather to enjoy our new deck!"
-Jennifer Raff

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.

"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."

- Brian Stone

"Keystone Custom Decks recently built us a beautiful new deck. The process was so easy. Our options for materials were clearly laid out and the price was reasonable. The crews were polite, professional and SO QUICK."

- Becky Kaser

"Keystone Custom Decks uses a process that is customer and quality focused, thorough, and professional. The initial meeting, the quote with the drawing(s) and 3-D renderings, and the build process were all very satisfying. Work started on my deck during the week prior to Thanksgiving 2019, as promised, and it was completed on time."

- Ensley Townsend

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! 

If you live in beautiful Ontario County, then we don’t need to explain much about the natural beauty, history, or plenty of attractions in the county or surrounding area:

  • Bristol Mountain Ski Resort
  • Belhurst Castle and Winery
  • Sonnenberg Gardens and Mansion State Historic Park 
  • Honeoye Lake
  • Finger Lakes Gaming and Racetrack
  • Roseland Wake Park
  • Candice Lake


Located in Western New York, Ontario County is part of the Finger Lakes region and has over 107,931 people in a land area of 644 square miles.

Ontario County has a large tourism industry based around the Finger Lakes. 

We provide our custom deck services to all cities and boroughs in Ontario County, including: Canandaigua (county seat), Geneva, Bristol, Canadice, East Bloomfield, Farmington, Gorham, Hopewell, Manchester, Naples, Phelps, Richmond, Seneca, South Bristol, Victor, and West Bloomfield.

We also service a variety of other townships and unincorporated communities, including: Crystal Beach, Gorham, Hall, Honeoye, Port Gibson, Border City, Centerfield, Cheshire, Fishers, Hall, Hopewell Center, Ionia, Orleans, Seneca Castle, and Stanley. 

We service all zip codes in Ontario County with custom decks and outdoor living spaces, including: 14424, 14456, 14564, 14425, 14522, 14487, 14469, 14512, 14432, 14532, 14548, 14485, 14471, 14561, 14560, 14544, 14504, 14466, 14475, 14585, 14537, 14453, 14463, 14547, 14461, 14518, and 14443. 

As the Canandaigua Chamber of Commerce states, “The Finger Lakes' natural beauty is a handsome backdrop for memories of all kinds - business startup, destination weddings, raising a family, enjoying a vacation, attending college, building a career or enjoying an active retirement. Whether you’re new to the area or a lifetime resident, we’re happy to help you get the most out of your time in Canandaigua.

We welcome visitors, residents, entrepreneurs and businesses to the shores of one of the most beloved lakes in the Country.  Whether we meet online, in our Visitor Center, at one of our signature events or the sidewalk, we’re happy to offer guidance on how to get the most out of your time in Canandaigua.”

Get started with your dream deck and outdoor living space -- schedule an estimate with Keystone Custom Decks today! 

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!