Harleysville Deck Builder | Sun-In Builders

Custom decks in Harleysville, PA. Wood and composite builds, repairs, railings. Quality work, fair pricing. Free quote.

Deck Design, Build, Repairs, and Rebuilds

Local Deck Builder for Wood & Composite Decks in Harleysville

Since 1996, Sun-In Builders Custom Decks has been the name homeowners trust when they want it done right the first time. As one of the nation's elite Trex Pro Platinum builders, we combine premium materials with old-school craftsmanship—no shortcuts, no subcontractors, no compromises.


Whether you're envisioning a simple deck refresh or a complete backyard transformation with multi-level designs, custom lighting, and built-in features, our team handles every phase in-house. From site prep and grading to the finishing touches that make your neighbors jealous, you get one experienced crew, one point of contact, and one guarantee: exceptional results.

We Handle Everything Your Outdoor Space Needs

A beautiful deck is just the beginning. We provide the complete foundation and finishing touches:

  • Foundation prep, grading, and leveling
  • Concrete pads and hot tub foundations
  • Stone work and drainage solutions
  • Custom lighting design and installation


Outdoor Living Upgrades for Homes Across Harleysville

From custom decks and elegant gazebos to hot tub enclosures and privacy screens, we create outdoor spaces that enhance your home and fit your lifestyle. With 28+ years of experience, expert craftsmanship, and a no-subcontracting guarantee, every project is built to exceed your expectations.

Wooden deck with black and white fence surrounding a pool.
Wooden deck with a hot tub surrounded by benches in a wooded setting.

Hot Tub Enclosures & Spa Decks

Enjoy your hot tub year-round with a beautifully integrated enclosure. We seamlessly blend your spa into your existing or new deck, adding privacy screens, weather protection, and safe access.

Hot Tub Enclosures
Wooden gazebo with screened walls, brown roof, set in a garden with red flowers and green bushes.

Gazebo Construction

Add timeless elegance to your backyard with a custom-built gazebo. Perfect for entertaining guests, creating a quiet retreat, or serving as a stunning focal point in your landscape.

Gazebos
Two-story deck with stairs, latticework, and satellite dish attached to a beige house, surrounded by green shrubs.

Privacy Screens

Define your outdoor space with custom trellises and privacy screens. Add shade, create separation between areas, or provide a beautiful backdrop for climbing plants.

Privacy Screens
Rear view of a white house with a two-level deck on wooden posts; black railings and stairs.
Deck with illuminated posts at dusk, overlooking a yard and trees.
Backyard with a raised wooden deck, stairs, hot tub, and stone retaining wall.

The Difference Is in the Details

Why Harleysville Homeowners Choose Sun-In Builders Custom Decks

When you're investing in an outdoor space for your family, you want it done right the first time. Here's what sets us apart:

No Subcontractors, Ever

Your project is handled entirely by our experienced team. No strangers showing up, no miscommunication, no surprises.

Trex Pro Platinum Certified

We're among the elite 1% of deck builders nationwide who've earned this distinction. It means premium training, premium materials, and premium results.

Complete Site-to-Finish Service

From grading and concrete pads to custom lighting and finishing touches, we handle everything under one roof. No coordinating multiple contractors or dealing with finger-pointing.

Green

 Love Your Deck or We Haven't Finished

100% satisfaction isn't just a promise—it's how we've stayed in business for nearly 30 years.

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Free Estimates, Zero Pressure

We'll show you what's possible, what it costs, and give you space to decide. No pushy sales tactics.

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Built on 28 Years of Getting It Right

 When you've built thousands of decks across three states, you learn what works—and what doesn't.

Built by Craftsmen. Not Contractors.

A Harleysville Deck Builder Focused on Craftsmanship and Clean Builds

We exclusively work with industry-leading brands because your deck should look stunning on day one and year twenty.


  • Trex, TimberTech & Fiberon Composite Decking - The beauty of wood without the maintenance headaches
  • Endurance & Deckorators Railing Systems - Safety and style that complements your design
  • Custom Low-Voltage Lighting - Extend your outdoor living into the evening


Green Trex logo with the registered trademark symbol.
Logo for "Upside Under Deck Ceiling" by Color Guard. Blue and gray text with a blue upward arrow and water drops.
Fiberon logo: Black text with a red dot above the "i", red "on" with the tagline "The Decking Solutions Company".
TimberTech Composite by AZEK logo.
Decorators logo with red "K" and slogan "Go Beyond Ordinary".
Large wooden deck with stairs attached to a two-story house, set in a grassy yard under a blue sky.

Request a Free Deck Quote in Harleysville

Step 1: The Free Consultation

We visit your home, explore your backyard, and listen to what you're dreaming up. Bring the Pinterest board, the napkin sketches, or just tell us "I want a place to actually use."

Step 2: The Custom Design

We send over a detailed plan and transparent pricing. No hidden fees, no "oops we forgot that" moments later. Just honest numbers for honest work.

Step 3: The Build

Our in-house team transforms your yard while you go about your life. We clean up daily, communicate constantly, and treat your property like it's our mom's house.

Step 4: The Reveal

Final walkthrough, your approval, and then it's all yours. Plus our number for life, because we stand behind what we build.

Custom Deck Builder Serving Montgomery & Bucks County, PA

For over 28 years, Sun-In Builders has been the trusted choice for homeowners throughout southeastern Pennsylvania who want exceptional deck construction without compromise. We bring the same commitment to quality, craftsmanship, and personalized service to every community we serve—from bustling suburban neighborhoods to quiet rural townships. Whether you're in Montgomery County, Chester County, or Bucks County, our licensed team handles everything from permits to final inspection, creating custom outdoor spaces that transform how you enjoy your home.

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