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Composite Deck Cost Calculator
Price a composite deck by the board line you actually want. This calculator covers entry, mid and premium composite plus cellular PVC, and shows what each costs to build and to own.
Why your estimate is what it is
What drives composite deck costs in La Jolla
Composite decking is sold by brand, but what you are really buying is a tier — and warranty length is the honest guide to which one you are in. A 25-year board and a 50-year board are different products, not different colours. This calculator prices the board, the frame under it, the railing around it and the labour, then compares the ten-year cost against the same deck in wood.
Board line and tier
Entry composite, mid-tier, premium and cellular PVC sit at meaningfully different prices. Nationally the spread runs roughly $35 to $70 a square foot installed; coastal San Diego sits at the upper end of that.
Framing choice
Composite outlasts the wood under it. A new pressure-treated frame is standard; steel costs about 20% more and does not rot, twist or shrink. Reusing an old frame saves roughly a quarter and carries the most risk.
Hidden fasteners
Clips cost more in materials and in labour than face-screwing, and they are the difference between a composite deck and a screwed-down one.
Board layout
Picture-frame borders, diagonals and inlays all add waste and blocking. Straight runs waste the least and go down fastest.
Railing
Matching composite railing runs $45 to $90 a foot. Cable and glass cost considerably more and exist for one reason: not blocking a view.
Height and levels
Every foot off the ground adds framing, and every change of level adds a beam line, footings and steps.
What could push your price higher
- Premium or PVC board lines instead of the entry tier
- Steel framing rather than pressure-treated
- Hidden fasteners, picture-frame borders and colour inlays
- Cable or glass railing
- Multi-level layouts
- Removing an old deck first
What could bring it down
- Entry or mid-tier board lines in a solid colour
- Straight board runs with face-screwed fasteners
- Matching composite railing rather than cable or glass
- Reusing a frame that has genuinely been inspected and passed
- Keeping the deck to one level
Turn the estimate into a real number
This calculator works from published 2026 cost figures for coastal San Diego. It cannot see your framing, your flashing, how a crew would reach the work, or what is behind the siding at the ledger — and those are exactly the things that decide a real price. We will come out, measure, and give you a written scope with no pressure attached.
Book a free site visitFrequently asked questions
How much does a composite deck cost in La Jolla?
Small composite decks under 200 square feet typically run $9,000 to $16,000; 200 to 400 square feet runs $16,000 to $32,000; and large or multi-level builds over 400 square feet run $32,000 to $60,000 and up. Composite decking material on its own is roughly $9 to $18 a square foot, which is only about a third of an installed deck.
Which is better, Trex or TimberTech?
They compete tier for tier rather than one being better outright. Trex Enhance and TimberTech EDGE are the entry lines; Trex Select and TimberTech PRO sit mid-range; Trex Transcend and the TimberTech AZEK PVC lines are the premium end. Match the warranty to how long you plan to own the house and the brand argument mostly resolves itself.
Is PVC decking better than composite near the ocean?
On a salt-air lot, yes, and the reason is what is in the board. Composite is wood flour and plastic; cellular PVC has no wood content at all, so there is nothing for moisture or mould to feed on. PVC is also lighter and stays cooler in direct sun. It is the most expensive board on the list and the one that ages best in La Jolla.
Can I put composite decking on my existing frame?
Only if the frame is genuinely sound — right joist spacing, no rot, no corroded hangers, a solid ledger. It saves roughly a quarter of the build cost and it is the most expensive mistake in decking if you get it wrong. A 50-year board on a frame with five years left in it is money thrown away, and on a La Jolla deck over fifteen years old the hardware has usually gone before the lumber.
Does composite decking get hot?
Yes, all decking does, and darker boards get hotter. PVC runs noticeably cooler than wood-composite in the same colour because it reflects rather than absorbs. If the deck faces west and gets full afternoon sun, that difference is worth more than the colour you had in mind.
How much maintenance does composite need?
Washing, and that is it — no sanding, no staining, no sealing. Over ten years that is a few hundred dollars against a few thousand for a wood deck on this coast. The calculator above puts both numbers side by side.
Related calculators
Planning the whole project? Start at the La Jolla deck cost calculator hub, or read more about our Composite Deck Installation service.