How to Anchor a Pergola for Beginners

At PERGOLUX, we want you to feel as confident assembling your pergola as you do relaxing under it. Proper anchoring is one of the most common topics we get asked about by customers planning a pergola purchase. Attaching your pergola properly is critical to keep your investment stable and safe for years to come.

This guide provides the technical specifics for the four most common installation surfaces. 

Before You Begin

Download the specific foundation plan for your model series below:

• Series 3 Models: Skydance S3 Foundation Plan, Standard S3 & Sundream S3 Foundation Plan
• Series 2 Models: Skydance S2 Foundation Plan, Standard S2 & Sundream S2 Foundation Plan
  

Don't see your model listed? Contact customer support to request a copy of your foundation plan documents.

Before you start, begin by:

1. Review your pergola's foundation plan documentation
2. Calculate the total weight of your pergola, including any planned accessories (a single glass wall can add up to 763lbs to your total load)
3. Review our foundation guide to understand which foundation type is best for your project
4. Contact your local building department to ask for their specific structural code requirements for "freestanding accessory structures" or pergolas

Proper anchoring remains the responsibility of each homeowner. While this guide provides recommendations based on standard engineering practices, every backyard is unique. If you are unsure about the structural integrity of a deck or the composition of your soil, we always suggest consulting with a local contractor.

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How to Anchor a Pergola to Concrete

Best For: Driveways, reinforced patios, pool decks & concrete pads

Concrete is the most straightforward surface for anchoring. It is one of the strongest foundation types for pergolas. Fresh concrete pads are often added by homeowners specifically to support a pergola living space, but you can just as easily anchor to existing concrete.

Approach to Anchoring in Concrete

You'll anchor directly into the slab using high-quality wedge anchors.

Before you begin, inspect existing concrete to make sure it's able to support your pergola. For new concrete slabs, discuss these questions with your contractor to make sure the slab is designed properly.

What to look for:

• Are there any deep cracks in the concrete? Cracks weaken the concrete. Anchoring your pergola's post near a major crack can cause "spalling," when large chunks start to break off.
• Is the concrete thick enough to handle a 4 inch hole? That's the recommended depth for your anchor bolts. 
• Do you have at least 3 inches of space between the edge of the concrete and where your pergola's anchor bolts will attach? Drilling to close can cause corners of your slab to crack or break away.

Hardware & Tools for Concrete Anchoring

Use this list to gather the tools needed for your pergola's concrete anchoring installation. All items should be easily accessible at your local hardware store.

Hammer drill
Your secret weapon for clean, round holes in concrete. Hammer drills are faster and more exact than regular drills. They "punch" as they drill to reduce how much pressure you have to apply. Most hammer drills have a depth stop bar to make holes exactly as deep as you need, helping keep your fasteners from sitting too high or low.

Carbide-tipped masonry drill bit
Make sure this matches the "shank" style of your drill (usually straight shank or SDS-Plus). These specialized drill bits are made of tungsten carbide, which is nearly as hard as diamond, which makes them able to handle the high-impact force of the hammer drill. 

3/8" wedge anchor bolts (3 per post) in 5" length
You'll find these in the fastener aisle at most major hardware stores. Wedge anchor bolts expand when tightened. They push against the walls of the hole to create the permanent hold you need.

Canned Air or Vacuum
Use these to clean dust out of the holes after drilling for a better bolt connection.

Pro Tips

Hammer drills can be rented at Home Depot Tool Rental and Lowe's Rental.

Estimated Cost

$100-140

Expect to spend between $25-40 for the 12-18 wedge anchors needed for your pergola. An individual masonry drill bit should be around $15. You can rent a hammer drill for as little as $40 for a half day. Prices will vary by store and region.

 

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How to Anchor a Pergola to Deck Wood

Best for: Existing wood or composite decks

Anchoring a pergola to a wood deck requires a bit more planning. Your anchors need to "grip" the structural frame, not just the surface deck boards. The deck needs to be structurally able to support the total weight of your pergola, including any side walls or furniture you plan for the space. 

Approach to Anchoring to Wood

You'll anchor your pergola posts directly into the decks' joists. These are the load-bearing beams beneath the board. 

Before you start, inspect your deck to ensure it's ready to handle a heavy structure. You or a contractor should check to see:

• Is the deck healthy? Are there signs of wood rot or rusted brackets? If so, you'll need to address or replace rotten boards before mounting.
• Are the decks' footings property installed? They should be sturdy and deep enough to support the added weight of your pergola.
  
• Do the joists line up with where pergola posts will anchor? Standard decks have joists every 16 inches. Sturdier designs may have them every 12 inches. 

For installations where pergola posts do not align perfectly with an existing joist, you'll need to add extra wood supports (called "reinforcement blocking") between the closest joists. Pergola posts should never be anchored only to deck boards.

Pilot holes will be needed for each screw to prevent wood from splitting. Drill your pilot hole as deep as the bolt will go into the wood.

• For soft woods (pine/cedar), use a 1/4" pre-drilled pilot hole
• For hard woods, use a 5/16" pre-drilled pilot hole
  

Hardware & Tools for Wood Anchoring

Use this list to gather the tools needed for your pergola's deck installation. All items should be easily accessible at your local hardware store.

3/8" diameter galvanized lag screws (3 per pergola post) in a 4" length
Easily available in the fastener aisle at most major hardware stores. These screws are thicker and more resistant to chemicals used in pressure-treated lumber. Using a standard steel or zinc-plated screw can cause a chemical reaction that deteriorates screws over time.

3/8" galvanized washers (3 per pergola post)
Washers distribute the load of the screw across a wider area of wood. Since wood is soft, washers keep screws from crushing or sinking into the wood.

High-torque power drill
A common household low-torque drill may physically turn the bolt if you pre-drill a 1/4" pilot hole, but it's more likely to overheat or stall. A high torque drill protects your wrist from injury while making it easier to get a bolt deep into the wood.

Pressure Treated Lumber 
If needed, this is used to add blocks of support between joists for posts to anchor into. You never want a post anchoring to a floor board. 

Structural Wood Screws 
Only needed if you are adding supports. 

Pro Tip

If your deck is old, consider having a contractor do a pre-pergola inspection. They can review your project plans and confirm what prep work may be needed to ensure your deck can handle the load.

Estimated Cost

$70-$140

Cost for anchoring a pergola to a wood deck vary greatly depending on the deck's construction and pergola position. At minimum, expect to spend $20-30 for screws and washers. Most homeowners will need to purchase or rent a high-torque drill, which can cost between $30-60. Expect drill bits to cost around $15. If your project requires adding blocking between joists, budget another $25-40 for pressure treated lumber. A box of structural wood screws to secure them will add another $10. Prices will vary by store and region.

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How to Anchor a Pergola to the Ground (Grass, Dirt, Sand)

Best for: Backyards, gardens, or beach-side setups.

Never anchor a pergola directly into loose soil or sand. These surfaces shift, so you must create a sturdy "footing" under each pergola post to provide long-term stability.

Concrete Anchors for Pergolas in Grass, Dirt, or Sand

If you want to avoid a full concrete slab foundation, you'll need to add concrete footings under each post. You can also use a strip foundation. You can learn all about these in our complete foundation guide.

Before you start, you'll want to check:

• What is your soil type? Some soils are more prone to shifting. These may require a more sturdy strip foundation or full concrete slab for long-term stability.
• Are there local codes that require footings to be a certain size or depth? Many areas mandate they be 16-18 inches deep for proper stability. Areas with deep frost lines can require footings to be as deep as 36+ inches. Width of the footing may also be dictated by local code.
  

Once you've created your footings, you'll anchor your pergola using the same approach as the concrete foundation. Refer to the concrete anchoring section above in this guide.

Hardware & Tools

You'll use the same tools and hardware listed in the earlier concrete anchoring section of this page. 

Pro Tip

Check local codes for any requirements for footing depths. Many areas require them to be at least 16-18 inches deep, or below the frost line. Some areas require footings to have a width as large as 33"x33" depending on your soil type.

How to Anchor a Pergola to Pavers

Best for: Brick or stone paved patios

Pavers or decorative brick are usually "floating" surfaces; they aren't heavy enough to hold down a pergola during high winds. Anchoring into a paver alone can cause the paver to lift or crack.

You must anchor through the pavers into a concrete footing below.

Approach to Anchoring to Pavers

Temporarily remove pavers or brick where the posts will sit. Install a concrete footing (see instructions in our Foundation Guide). You can re-install pavers or brick around the post, or re-install completely and drill through them into the concrete below.

Hardware & Tools

Refer to the earlier concrete anchoring section of this page. You'll use the same tools, and follow the same approach, to anchor into the cement footings under pavers.

Customer Images of PERGOLUX Pergolas in Paver and Brick Installations

A Note on Safety & Local Regulations

While the PERGOLUX team provides these recommendations based on standard engineering practices, every backyard is unique.

Always check with your local municipality. Wind load requirements and frost line depths vary by region and may dictate how deep your footings need to be. If you are unsure about the structural integrity of your deck or the composition of your soil, we recommend consulting with a local contractor.

PERGOLUX does not guarantee that these recommendations are sufficient for every individual project. Proper anchoring remains the responsibility of each homeowner.

About the Author

This guide is written and managed by the PERGOLUX North America engineering team. We've helped support over 100,000 successful backyard projects around the globe. We review and update this guide regularly. If you have questions or suggestions, we'd love to hear from you.