Deck & Patio Cost in Ontario, CA (2026)
A deck & patio in Ontario costs $24–$55 per sq ft for deck and $10–$34 per sq ft for patio, with a typical mid-size deck or patio running $8k–$22k. Small projects start around $3k; large or high-end work can reach $47k or more.
Costs in Ontario run about 15% below the LA County baseline thanks to logistics-corridor labor pool and stable suburban stock.
Deck & Patio Cost by Size in Ontario
Totals adjusted for the Ontario market (0.85× LA County baseline). Ranges include labor, materials, permits, and contractor overhead.
| Size | Type | Range | Low | High |
|---|---|---|---|---|
| Small | Patio or small deck | 100–200 sq ft | $3k | $9k |
| Medium | Deck or covered patio | 250–450 sq ft | $8k | $22k |
| Large | Multi-level or pergola + patio | 500+ sq ft | $19k | $47k |
What Affects Deck & Patio Cost in Ontario?
- Material (concrete vs pavers vs composite deck).
- Permit (decks over 30" need one).
- Cover or pergola.
- Drainage.
- Hillside / sloped site.
- Ontario market premium: local pricing reflects logistics-corridor labor pool and stable suburban stock, which shifts totals about 15% below the LA County baseline.
Get exact deck & patio bids in Ontario
We'll match you with up to 3 licensed Ontario contractors.
Get MatchedDeck & Patio Sub-Type Comparisons
Concrete Patio vs Paver Patio
Concrete patios are the cheapest hard surface at $14–$20/sq ft but crack; pavers cost $25–$45/sq ft, allow individual repair, and add resale appeal in LA.
Composite Deck vs Wood Deck
Composite (Trex/TimberTech) costs $40–$75/sq ft and is maintenance-free for 25+ years; pressure-treated wood is $28–$45/sq ft but needs re-staining every 2–3 years in LA sun.
How to Get the Best Price on a Deck & Patio in Ontario
- Get 3 line-itemized bids on the same scope through Keystone Connect — Ontario deck & patio pricing varies 10–25% between contractors.
- Lock major materials and finishes before signing; mid-project change orders are the #1 cost driver on deck & patio jobs.
- Bid in shoulder seasons (Jan–Mar or Sep–Oct) when Ontario contractor schedules are open and rush premiums disappear.
- Verify CSLB license, insurance, and bond before paying any deposit. California caps deposits at $1,000 or 10% of contract, whichever is less.
Frequently Asked Questions — Deck & Patio in Ontario
Need more answers? Visit our contractor FAQ hub.
Get Matched with Licensed Ontario Contractors
Tell us about your deck & patio and we'll match you with up to 3 vetted contractors.