How much does a pergola cost?

A professionally built pergola runs about $2,500 to $9,000 depending on size and material, with custom timber and louvered units at the top. DIY with a kit or lumber is roughly $800 to $4,000, so building it yourself is where the big savings are.

Can I build a pergola myself?

Yes, a confident DIYer can build a freestanding pergola, especially from a kit. The work is setting footings and posts plumb and level, then assembling the beams and rafters. Attaching one to the house adds a ledger and waterproofing, which is trickier.

Do I need a permit for a pergola?

Often yes, especially for larger or attached structures, since they involve footings and setbacks from property lines. Rules vary widely by town, and an attached pergola is more likely to need one than a small freestanding kit. Check before you dig.

How deep should pergola footings be?

Footings should extend below your local frost line, often 12 to 48 inches depending on climate, so the posts do not heave when the ground freezes. Your building department specifies the depth, and getting it right is what keeps the pergola from shifting over winters.

Wood, vinyl, or aluminum pergola?

Wood is classic and customizable but needs periodic sealing. Vinyl and aluminum cost more upfront but are low-maintenance and resist rot and fading. Aluminum also enables louvered roofs you can open and close. Choose by budget, look, and how much upkeep you want.

UPDATED JUNE 2026

Pergola Installation Cost in Washington

Locally calibrated hire vs. DIY cost data for pergola installation projects in Washington. Cited sources, permit requirements, and a full build guide, free.

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HIRE A PRO

$2,800–$10,000

Fully installed, labor + materials

DIY COST

$900–$4,300

Materials + rentals, your labor free

Moderate

Requires some construction knowledge and proper planning.

Government Data · Government Data · Submitted Quotes (n=0)

How we got these numbers

National benchmark costs from RSMeans, Angi, Fixr, and HomeGuide are adjusted for Washington using two federal datasets: the Bureau of Economic Analysis Regional Price Parity (RPP) index and the Bureau of Labor Statistics (BLS) Occupational Employment and Wage Statistics. Washington's RPP is 1.1 (national baseline = 100) and its BLS labor adjustment factor is 1.15. Higher RPP means goods and services cost more relative to the national average; the BLS factor scales contractor labor rates to local wage levels. We blend these two adjustments, weighted 40% RPP, 60% BLS labor, to produce the ranges shown above.

adjusted_cost = national_benchmark × (0.4 × RPP/100 + 0.6 × bls_labor_adj)

RPP(Washington) = 1.1 · BLS adj = 1.15

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What's included

Item	Qty	Unit Cost	Subtotal
Posts, beams, and rafters	1 structure	$1,200	$1,200
Post bases and hardware	1 set	$200	$200
Concrete for footings	several bags	$8	$80
Stain or sealer	1 to 2 gal	$45	$90
Materials Total			$1,570

Tools you'll need

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TOOLS YOU PROBABLY OWN

Circular saw and drill
Level, string line, and ladder

TOOLS TO RENT OR BUY

Post hole digger or auger
Rent an auger for footings

Build sequence

1
Check setbacks and permits, then lay out the post locations square and level.
COMMON MISTAKE
Skipping the permit or building over a utility line.
2
Dig and pour footings below the frost line and set the post bases.
COMMON MISTAKE
Shallow footings that heave and rack the structure.
3
Set and brace the posts plumb, then install the support beams.
4
Attach the rafters and any top slats or louvers, evenly spaced.
5
Square and fasten everything, then stain or seal the wood.

Permits and code requirements

PERMIT REQUIREMENTS

Permit rules for pergola installation vary by city and county in Washington. Most structural, electrical, plumbing, or mechanical work needs a permit and an inspection. Confirm with your local building department, or see the Washington guide for specifics.

PERMIT THRESHOLD

Varies by municipality

Disclaimer: Always verify permit requirements with your local building department before starting work. Requirements vary by municipality and are updated periodically.

Frequently asked questions

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UPDATED JUNE 2026