Your deck
Your materials
Coverage assumed at 300 sq ft per gallon first coat, 400 second coat.
How much stain does a deck need?
Deck stain covers roughly 250–350 square feet per gallon on the first coat (300 is the safe planning number) and stretches to ~400 on the second, because sealed wood drinks less. A standard 16×12 deck with 40 feet of railing needs about 2 gallons for two coats — $60–$120 in stain depending on type, plus $40–$70 in cleaner, brushes, and supplies. Hiring the same job out runs $2–$4.50 per square foot, or $450–$900 for that deck — which is why staining is the single highest-ROI DIY task in home maintenance.
Stain types compared
| Type | $/gallon (2026) | Lasts | Shows wood grain? | Best when |
|---|---|---|---|---|
| Transparent sealer | $25 – $35 | 1–2 yrs | Fully | New cedar/redwood you want visible |
| Semi-transparent | $35 – $50 | 2–3 yrs | Mostly | The default — color + grain |
| Solid stain | $40 – $55 | 4–5 yrs | No | Older wood with flaws to hide |
| Resurfacer | $50 – $70 | 4–6 yrs | No — fills cracks | Rescue coat before board replacement |
The prep that decides everything
Stain fails from bad prep, not bad product. The sequence that works: clean (deck cleaner + stiff brush or gentle pressure wash), dry 48 hours minimum, test absorbency (sprinkle water — if it beads, the old finish must be stripped or sanded first), then stain in 50–90°F weather with no rain forecast for 24 hours and out of direct midday sun. Two thin coats always beat one thick one — thick coats sit on the surface and peel. And stain the railings first, deck boards last, so you’re never leaning over wet work.
Frequently asked questions
How many gallons of stain for a 12×16 deck?
How often should I stain my deck?
Should I roll or brush deck stain?
Can I stain over old stain?
Your railing
Tip: railing length = deck perimeter minus the house side and stair opening. A 16×12 deck typically needs 36–40 ft.
Every option, installed
Installed prices including posts, top rail, and infill. Code requires railing on decks over 30″ high, with balusters spaced under 4″.
How much does deck railing cost in 2026?
Deck railing costs $40 to $250 per linear foot installed depending on system — a wider range than decking itself. Pressure-treated wood rail is the budget anchor at $40–$70 per foot; composite systems run $70–$110; powder-coated aluminum $80–$130; cable rail $120–$200; and frameless glass tops the chart at $150–$250+. For a typical 40-foot railing run, that’s a spread from $1,600 (wood) to $8,000+ (glass) — railing is where identical decks diverge into different budgets.
Railing cost per linear foot (installed)
| System | Per ft (2026) | 40 ft total | Upkeep | Best for |
|---|---|---|---|---|
| PT wood | $40 – $70 | $1,600 – $2,800 | Stain w/ deck | Budget builds, matching wood decks |
| Cedar | $55 – $85 | $2,200 – $3,400 | Optional stain | Warm look, better rot resistance |
| Composite | $70 – $110 | $2,800 – $4,400 | None | Composite decks, zero maintenance |
| Aluminum | $80 – $130 | $3,200 – $5,200 | None | Slim profile, modern, durable |
| Cable | $120 – $200 | $4,800 – $8,000 | Re-tension yearly | View preservation |
| Glass panel | $150 – $250+ | $6,000 – $10,000+ | Cleaning | Premium views, wind block |
Choosing without regret
Match the investment level: a $120/ft cable rail on a pressure-treated deck is jewelry on a work truck — most builders suggest railing at 25–40% of total deck budget. Views change the math: if your deck faces water, mountains, or open land, cable or glass genuinely adds usable value; facing a fence, it doesn’t. The hybrid trick: aluminum balusters in wood posts ($55–$75/ft) delivers a semi-custom look at near-wood prices and kills the worst staining chore (balusters). Code notes: 36″ minimum height in most states (42″ in California and on some elevated decks), infill gaps under 4″, and stair rails have their own grip requirements — a good installer knows; verify a cheap one does.
Frequently asked questions
How much does 40 feet of deck railing cost?
When is railing required by code?
Is cable railing worth it?
Can I replace railing without rebuilding the deck?
Four free calculators for planning, comparing, and maintaining a deck — with July 2026 material prices and labor rates for all 50 states.
About these deck calculators
Decks are the most labor-heavy project we cover — about 45% of a built deck’s price is the crew — which makes them both the most state-sensitive and the most rewarding to partially DIY. These calculators separate the decisions the way real budgets do: the build itself, the material duel that dominates the total, and the two line items people underestimate (railing can equal a third of the deck; staining is a permanent subscription on wood). Prices surveyed July 2026; methodology here. Footings for your deck? Price them exactly with the sonotube calculator.