Pressure-treated wood
$38–$58/ sq ft installed
Lowest upfront cost; budget for sealing every 1–2 years.
Deck builder · S San Francisco, CA
O'Sullivan Construction
132 ARDEN AVE, S San Francisco, CA 94080
- Since 1990
About O'Sullivan Construction
O'Sullivan Construction is a licensed deck-capable contractor serving S San Francisco, California.
It has held an active California contractor license since 1990 — 36 years.
Below you can verify the license, see what a deck typically costs in S San Francisco, read homeowner reviews, and estimate your own project — all free and with no lead forms.
License & credentials
- License #
- 589596
- Status
- CLEAR
- Licensed since
- 1990
- Service area
- S San Francisco, CA
- Deck specialist
- Deck-capable
License details come from the public California contractor record processed by DeckMath and may have changed since. Always re-verify before signing.
Reviews
No reviews yet. Hired O'Sullivan Construction? Be the first to share your experience below — it helps other homeowners in S San Francisco.
Local cost guide
How much does a deck cost in S San Francisco?
Installed price per square foot by material, adjusted for local labor. A standard 16×20 ft (320 sq ft) build multiplies these by area — run the deck cost calculator for a figure tailored to your exact size, railing, and stairs.
Cedar & redwood
$49–$70/ sq ft installed
Warm natural grain; periodic staining keeps it from greying.
Composite
$70–$96/ sq ft installed
Low-maintenance with 25-year warranties — Trex, TimberTech, Fiberon.
PVC & capped polymer
$77–$109/ sq ft installed
Best moisture and stain resistance; lightest long-term upkeep.
Free deck calculators
Estimate your S San Francisco deck before you call
People also ask
O'Sullivan Construction questions, answered.
Yes. O'Sullivan Construction holds California contractor license #589596 (clear) on the public state record. You can confirm it yourself on the official California license lookup linked on this page.
DeckMath does not set or publish any contractor's pricing. As a benchmark, a 16×20 ft mid-range composite deck in S San Francisco runs roughly $22,528–$30,720 installed. Ask O'Sullivan Construction for a written quote and compare it against a free DeckMath estimate before you decide.
The California record lists O'Sullivan Construction as deck-capable, but it doesn't specify brands. Ask which composite or PVC lines they install — Trex, TimberTech, and Fiberon are the most common — and use the DeckMath Trex vs TimberTech tool to compare before you ask.
Use the review form on this page. Every review is moderated and published only if it appears to be from a genuine customer — DeckMath shows aggregate ratings only after at least three published reviews, in line with FTC guidance.
Disclaimer: DeckMath independently lists this contractor from the public California license record and does not endorse, employ, vet, or guarantee them. Reviews are the opinions of their authors. License status reflects the most recent public data we processed and may have changed — always verify the license, insurance, and references directly before hiring.