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

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

Deck Builder in Adams County, PA

“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

 “We’re very excited

to use our new outdoor space.  With football season around the corner it will get a lot of use!”

- Erica Evans

“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 Adams County with a custom outdoor 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.

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 dream decks in Adams County and nearby areas for over 30 years.

“Keystone did a great job explaining the process and pointing out the differences in construction between the companies we were considering.

The workmanship was excellent and we were very happy with the results. Anyone we talked to in the company was a pleasure to deal with. Highly recommended.

-Anne M.

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

“From the initial meeting with Ron, to the walkthrough in their gorgeous new showroom you really got to see your dream deck come to life. Their 3D imaging was incredibly helpful envisioning the finished product."

- Katie Leonard

What you can expect with Keystone Custom Decks:

Turn-key Projects

Our team takes care of the entire construction process - from design to permitting to installation.

Lifetime Workmanship Warranty

We stand behind our work for life.


We make sure your project is built according to the timeline and scope of the proposal.

Financing Available

We offer financing options through our financing partners.

“Mahlon and his team did an excellent job with our small deck project. He helped get my thoughts down on paper and in the end the deck turn out even better than we had imagined. It was completed in no time and we have already been able to enjoy the sunshine!

- Kristen M.

“All the neighbors agree on what a wonderful job and how much it changed our home. You are a stand behind your work company after having some issues you came right out to solve the problem. Your honesty and integrity are outstanding. I would and will highly recommend your company.

- Amy H.

"We just wanted to let you know how pleased we are with the work that Keystone Custom Decks did in transforming our outdoor patio. From the initial consultation with Ron Yoder to the final build, the entire process went smoothly. Matt Blank and his crew were the best!

- Dave K.

"Not only did Mahlon help us design exactly what we wanted (with super-helpful 3D renderings), he created exactly what we wanted. He and his 2 teammates were here bright and early and worked SO FAST. They were kind and respectful, which was especially important given that I'm home with my young kids who love to watch and ask questions.

- Andrea R.

"We had a difficult site with steep slopes and Mahlon and his crew did an amazing job of minimizing the disturbance and working with the grade. The decks (two separate decks) are beautiful and just when I was sure they were done with an area, they added more trim, more detailed finishing work. The final product is just so wonderful!

- Brenda E.

Adams County Deck Builder

Do you own a home in Adams County or closeby?  If so, you want a beautiful outdoor living space for hosting, relaxing, and spending quality family time.  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.  For over 30 years, our company and team have committed ourselves to make these dreams come true for you and your family.

We are a custom deck builder in Adams County, PA, and the surrounding counties.  Relax in your beautiful, custom backyard and outdoor area after a day enjoying the many beautiful towns and areas surrounding the county!

Adams County has a lot of attractions to offer including: 

  • East Coast Exotic Animal Rescue 
  • Tiny World
  • Mountain Heritage Art and Crafts Festival 
  • Hawn's Overlook
  • The Turkey Hill Experience 
  • Pen Mar Park 
  • Kilgore Falls
  • Cowans Gap State Park 
  • Flood Zone Marketplace and Brewery 
  • Thousand Steps
  • And so much more!

Admas County is home to 103,852 residents as of 2020. It covers 522 square miles, 519 land, and 3.1 water. The county seat is the borough of Gettysburg, the site of the infamous Civil War Battle of Gettysburg. 

We serve all of Adams County towns and zip codes: 17301, 17303, 17304, 17306, 17307, 17310, 17316, 17320, 17324, 17325, 17337, 17340, 17343, 17344, 17350, 17353, 17372, 17375.

Abbottstown, Arendtsville, Aspers, Beecherstown, Bendersville, Biglerville, Bonneauville, Brysonia, Carroll Valley, Cashtown, Center Mills, Charnita, East Berlin, Fairfield, Fairplay, Floradale, Gardners, Gettysburg, Goodyear, Greenstone, Guernsey, Heidlersburg, Hunters Run, Hunterstown, Idaville, Kingsdale, Littlestown, McKnightstown, McSherrystown, Mount Tabor, New Oxford, Orrtanna, Peach Glen, Pine Grove Furnace, Starners Station, Table Rock, Toland, Uriah, White Hall, York Springs.

Custom Decks in
Adams County, PA

To make your dream backyard a reality, we also know that you may want more than just a deck.  That is why we are more than just a local deck builder; we also offer multiple custom features to go along with your custom deck.

We build porches, patios, pergolas, outdoor kitchens, fire pits and fireplaces, masonry features, and water features to accompany your custom deck.

All of these features will allow you to create a personalized space where you will make new memories, share family meals, relax in your backyard, and become a master host with a beautiful outdoor space.

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!