Create

your Dream outdoor living space

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Improve your lifestyle
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Host Great Parties
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Deck Builder in Mendon, NY

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

Patios
Porches
Decks
Pergolas

Additional Features

Outdoor Kitchens
Firepits and Fireplaces
Water Features
Masonry Features

“We LOVE our new deck

with an outdoor kitchen and fireplace!”

- Megan & Dave Johnson
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Become a Master Host in Mendon with a New Backyard Deck

  • Happy Friends Having Lunch

    Host Great
    Parties

    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.

  • Smiling man crossing his arms

    Be Proud
    of Your Space

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

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View Some Of Our Projects In The Mendon Area:

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Trex Biscayne Deck / Stamped Concrete Patio – Penn Yan, NY

1400 Loree Rd-9

Trex Toasted Sand Deck/Open Porch/Fireplace – Penn Yan

765 Old Pines Trail-8

Trex Lineage Biscayne Deck/Open Porch – Penn Yan

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Flagstone Patio/Screened Porch/Outdoor Kitchen/Boat House – Penn Yan

2427 Avon Rd-3

Timbertech Legacy Ashwood Deck/Open Porch/Fireplace/Outdoor Kitchen – Penn Yan, NY

1S5A5522

Trex Pebble Grey Deck / Stamped Concrete Patio – Penn Yan, NY

5733 E Bluff Dr-1

Trex Rainier Deck / Outdoor Kitchen – Penn Yan, NY

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Trex Saddle Deck / Paver Patio / Pergola – Penn Yan NY

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Trex Saddle Deck / Cedar Pergola – Penn Yan, NY

Keystone Custom Decks

Covered Trex Deck and Outdoor Kitchen – Keuka Lake, NY

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.

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“Keystone Custom Deck was the greatest.  I got 4 estimates and went with Keystone.  Truly a professional group, and friendly, and easy to work with.

They gave us 3D images of the design on our house, and the finished product looks just like the design.  They walked us through everything and were attentive every step of the way."

-John Walston

We make a new deck in Mendon 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

    Installation

    Sign your proposal and watch your dreams become reality.

  • 4

    Enjoy

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

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“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
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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.

Integrity

We deliver on our timeframe and proposal promises.

Financing Available

We offer financing options through our partners.

"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 "makes it easy", he 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 he goes back and communicates exactly that to the crew! 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 is 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!"

- Pat Kalaboke

"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

"I have nothing but positive things to say about Keystone Custom Decks! Mahlon was amazing to work with and so helpful with the design. Our deck was built in early March (5 months ago) and we have yet to find anything we would have liked to be done differently. It is perfect! The crew was professional, on time, clean and quick!! Other than the sounds of work being done, I wouldn't have even known they were there. It was such a wonderful experience from start to finish! I have recommended them to anyone that mentions needing a deck or a patio. I will definitely be calling them again for our next project! THANK YOU Keystone Custom Decks!!!"

- Tiff Ossichuck
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Custom Decks in
Mendon, NY

If you are a homeowner in the Town of Mendon or nearby area, 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.

Mendon 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 Mendon.

We also offer the following:

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