DIY Modular Grill Islands: Easy to Build, Limitless Possibilities

Pre-Designed Masonry Kits. Delivered to your driveway, assembled by you in an afternoon

Buy Grill Island Kits Here

Custom Stone BBQ Islands Designed Your Way

Create a professional masonry structure that fits your specific space and cooking style. Our modular system gives you the freedom to design the exact layout you need without the constraints of a standard “box store” kit. Whether you are building a compact grilling station or a sprawling entertainment hub, simply combine the modules to match your vision.

Grill Islands are Customizable

Customizable

Because our system is modular, you get the simplicity of a standard product with the design freedom of a custom build.

DIY Friendly

Easy Installation

If you can stack blocks and use a caulking gun, you can build a professional-grade stone island in a single afternoon.

Durable all masonry build

Durable Masonry

These frames don’t just look like stone—they are stone. They provide a rock-solid foundation that is impervious to rot, rust, and weather.

The Unity System: Smart Modules, Limitless Layouts


Create a professional masonry structure that fits your specific space and cooking style. Our modular system gives you the freedom to design the exact layout you need without the constraints of a standard “box store” kit. Most outdoor kitchen projects stall because of the “compatibility headache”—trying to match a stone frame from one company with a grill from another. The Unity System solves this. We provide the complete package: the masonry structure, the countertops, and the premium appliances. It is a fully curated system where every component is guaranteed to fit, eliminating the research and the guesswork.

  • Outdoor kitchen layout shown with disconnected modules.
  • You can see how easily all of our grill islands connect.
  • You can even connect grill islands to make an exterior corner.
  • Connect multiple grill islands together for your ultimate outdoor cooking experience.
  • You can easily connect all of our kitchen components following a few simple rules.
  • Outdoor kitchen bar unit corner connect

Click image to enlarge.

Compact stone Grill Island outdoor kitchen module for large 32 inch Somerset grill.

Start with a Modular Grill Station Base

Every project begins with a Base Module. This is your primary cooking anchor. For gas lovers, our G-Series Islands come equipped with a premium, warranty-backed grill explicitly chosen to fit the stone frame. For charcoal and pizza enthusiasts, our Kamado and Pizza Modules feature universal platforms designed to support your Kamado smoker or pizza oven. You can buy from us or bring your own kamado or Pizza Oven, but all grill modules include a built-in grill to ensure a correct fit.

Stone outdoor Grill Island kit DIY

Expand with Interlocking Storage & Counter Modules

This is where the system adapts to you. If you need more counter space, deep storage, or a corner return, simply connect a Unity+ Module. These expansion units feature an integrated open-ended design that locks directly into your Base Module. They eliminate the “dead space” found in other kits, allowing you to turn a simple grill station into a seamless L-Shape or U-Shape instantly.

L-shaped outdoor kitchen with Kamado grill, 32-inch gas grill, and bar seating, designed for long patios or narrow spaces.

Configure Linear, L-Shape, or U-Shape Designs

Your patio shape shouldn’t dictate your cooking style. Because our modules are interchangeable, you control the final footprint. Keep it simple with a compact Linear island against a wall, create a social L-Shape bar for guests to gather around, or build a chef-grade U-Shape kitchen for maximum prep space. The modules are the same; how you arrange them is up to you.

Grill island with pizza oven, kamado smoker, and gas grill.
Grill island with pizza oven, kamado smoker, and gas grill made by connecting two modules at a 90° angle using a corner module.
Straight Grill Island with wood-fired pizza oven and Kamado smoker with stainless drawers and wood storage
Straight Grill Island with wood-fired pizza oven and Kamado smoker with stainless drawers and wood storage made from two modules.

Assemble Your Stone Grill Island in an Afternoon

See How Simple Real Masonry Can Be

Learn from the Pros – Check Out Our How-To Videos on YouTube

Building your dream outdoor kitchen shouldn’t feel like a major construction project. With clearly labeled components and detailed video instructions, your kit comes together smoothly, letting you focus on the fun of the build—not the hassle. Don’t just take our word for it. Watch Terry build a complete Unity G+ Grill Island right on a patio. From the first block to the final sear, this video proves that “DIY” doesn’t mean “Second Rate.

Shop Unity Grill Island Kits

Transform your outdoor space with DIY grill islands that bring both functionality and style to your backyard. Whether you’re dreaming of a custom outdoor kitchen or simply upgrading your grill setup, our modular grill islands allow you to create the ideal environment for cooking, entertaining, and alfresco dining. From compact, DIY-friendly designs to expansive outdoor grill island configurations, you can build a space that fits your culinary needs, lifestyle, and budget.

Hear What Our Island Owners Say

Customer built affordable DIY outdoor L-shaped kitchen

Real Stories, Real Outdoor Kitchens

❞

If I could give Cornerstone Rocks 10 stars, I’d give them 20. From ordering to delivery to support, Jake and Terry are consummate pros. The instructions were spot on, and when we did have a question, a quick call got us right back on track. My friend and I—two old guys—built a Unity C+ and Unity Z+ Deluxe in an L-shape in just two days. Friends are blown away by the results! The only disappointment? That the build was over—it was that rewarding.

George W.

Beginner

Click here for helpful article on how to design your perfect outdoor kitchen.

5 Tips for Designing the Perfect Outdoor Kitchen Layout

Plan Your Outdoor Space with Confidence

Not sure where to start? These are our top guides, videos, and tools to help you design and build smarter.

From site layout to kitchen planning, these foundational resources will guide you every step of the way.

This video will help you know what you need to think about before you start any outdoor living project.

Watch This Before You Buy Anything or Start your Project

Overview of a lively patio party featuring an outdoor kitchen and fireplace, creating a warm and inviting atmosphere for guests.

Plan the Perfect Patio Layout: The ‘Big Three’ Outdoor Design Strategy

Download our Design Guide PDF.

Create Your Custom Outdoor Space. It’s easy with Our Layout Guide

Build Out Your Backyard with Coordinated Kits

DIY-friendly pizza oven installed connected to a backyard patio fireplace for a unique cooking and gathering experience

Add a Matching Outdoor Fireplace

Extend your outdoor season long after the sun goes down. Add the warmth, height, and architectural presence of a solid masonry fireplace to your design.

Pizza oven grill island with storage and extra countertop space.

Add Wood-Fired Flavor with a Pizza Oven

Don’t stop at grilling. Whether integrated into your island or built as a standalone feature, these kits bring the authentic pizzeria experience to your backyard.

Landscape seat wall and fire pit area round creates an impressive outdoor gathering space.

Expand Your Patio Space with Built-In Seating

Add a matching seat wall nearby to define your space, create natural flow, and offer effortless seating. It’s an easy way to elevate your layout and make the whole area feel more inviting.

Frequently Asked Questions

Does the kit come with the grill?

It depends on the model. For our Gas Grill Islands (G-Series), yes. We include a premium, warranty-backed gas grill to guarantee a perfect fit with the stone cutout. For Kamado and Pizza Oven Islands, the appliance is sold separately (or you can use one you already own). These modules feature universal platforms designed to accommodate standard ceramic grills and portable ovens.

Can I use my own gas grill?

To ensure structural integrity and a seamless finish, our G-Series islands are sold as a complete system, including the grill. Because our stone modules are cast with precise masonry openings, retrofitting a third-party gas grill often results in unsightly gaps or unsafe clearances. You are better off not designing an entire kitchen around a grill.

Do I need a professional installer?

No. We designed these kits specifically for DIY assembly. There is no need for complex plumbing, refrigeration, or electrical work; our components are designed to keep outdoor cooking simple. If you can stack blocks and use a caulking gun, you can build this island yourself in an afternoon.

How is the island shipped?

Your kit will arrive on pallets via a standard freight carrier. The delivery is “Curbside,” meaning the truck will lower the pallets to your driveway. From there, you can unstack the individual blocks and move them to your patio or backyard by hand or with a dolly.

Can I build this on a deck?

We generally discourage it. While it is possible with enough structural reinforcement, placing a solid masonry island on a standard wood deck is more trouble and expense than it is worth. These kits are heavy (exceeding 2,000 lbs), and most residential decks are not engineered to support such a concentrated dead load. The smarter move is to build your island on a concrete pad or paver patio adjacent to the deck. If you are determined to build on a raised deck, you must consult a structural engineer to reinforce the framing before installation.

Ready to Transform Your Outdoor Space?

Discover how Custom DIY Grill Islands & Outdoor Kitchen Module Kits can add functionality to your backyard.

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