The 25-Year Deck Cost — Total Cost of Ownership
Upfront price is only the down payment. Over 25 years, maintenance and replacement flip the ranking — here's the real lifetime math on every decking material.
Almost everyone shops a deck on upfront price, and almost everyone is optimizing the wrong number. A pressure-treated deck is the cheapest to build and one of the most expensive to own, because it needs re-staining every couple of years and usually gets replaced once inside a 25-year window. Composite costs more on day one and less over the life. This guide does the 25-year math — purchase, maintenance, and replacement — so you can see which material is actually cheapest for the time you'll own the deck, not just the day you build it.
The three costs of owning a deck
Total cost of ownership has three parts, and shoppers usually see only the first:
- Upfront — materials + labor to build it. The number everyone compares.
- Maintenance — staining, sealing, washing, board replacement, year after year.
- Replacement — when the surface reaches end of life and gets torn off and redone.
Lifespan and maintenance by material
| Material | Service life | Annual upkeep | Upkeep task |
|---|---|---|---|
| Pressure-treated wood | 10–15 yr | ~$0.45 / sqft / yr | Re-stain every ~2 yr |
| Western red cedar | ~20–25 yr | ~$0.35 / sqft / yr | Re-stain every ~3 yr |
| Composite (capped) | 25–30 yr | ~$0.05 / sqft / yr | Wash only |
| PVC (capped polymer) | 30+ yr | ~$0.05 / sqft / yr | Wash only |
On a 320 sqft deck, PT upkeep at $0.45/sqft/yr is about $144 every year — roughly $3,600 over 25 years just in stain and labor. Composite at $0.05/sqft/yr is about $16/year, or ~$400 over the same period. That ~$3,200 maintenance gap is the heart of the lifetime math.
The replacement penalty
Service life is the second lever — how fast a wood species decays in exterior use is documented in the USDA Forest Products Laboratory Wood Handbook. If a PT surface lasts ~12 years, a 25-year horizon means you build it, then tear off and rebuild the surface once — paying for boards and labor a second time, plus demolition of the old surface.
- PT wood: plan on one mid-life surface replacement within 25 years.
- Cedar: borderline — may reach ~22 years with diligent maintenance, may not.
- Composite / PVC: typically one surface for the full 25+ years; framing outlasts the surface either way.
A 25-year side-by-side
Illustrative 320 sqft deck, ranked by lifetime cost rather than upfront. Exact numbers depend on your region and labor — run the calculator — but the pattern holds everywhere:
| Material | Upfront | 25-yr maintenance | Replacements | Lifetime rank |
|---|---|---|---|---|
| PT wood | Lowest | Highest (~$3,600) | ~1 surface rebuild | Often most expensive to own |
| Cedar | Low–mid | High (~$2,800) | 0–1 | Middle |
| Composite | High | Lowest (~$400) | 0 | Usually cheapest to own |
| PVC | Highest | Lowest (~$400) | 0 | Cheapest near water / longest life |
Composite (backed by manufacturer 25–50-year warranties) typically wins the 25-year number for most homeowners; PVC wins around pools and the coast where moisture is brutal; PT wins only if you genuinely plan to own the deck a short time or you enjoy the staining ritual.
When the cheap deck is the right deck
Lifetime cost isn't the only consideration. PT wood is the right call when:
- You're selling within a few years — you won't be around for the maintenance years or the replacement.
- Cash upfront is the binding constraint — the cheapest deck you can build now beats the better deck you can't afford.
- It's a small or low deck where the absolute maintenance dollars are tiny.
- You actively want to re-stain — some owners enjoy it and like changing the color.
Frequently asked questions
Is composite decking cheaper than wood over time?
Usually yes, once you count maintenance and replacement. Composite costs more upfront but needs only washing (~$0.05/sqft/yr) and lasts 25–30 years. Pressure-treated is cheap to build but needs re-staining every ~2 years (~$0.45/sqft/yr) and typically gets replaced once inside 25 years. On a 320 sqft deck the maintenance gap alone is roughly $3,200 over 25 years in composite's favor.
How long does a pressure-treated deck last?
About 10–15 years for the surface with regular staining, less if neglected. The framing can last longer if it's ground-contact rated and stays dry, but the walking surface — the part that takes sun, rain, and foot traffic — is usually the first to need replacement. Over a 25-year horizon, plan on rebuilding a PT surface once.
What's the cheapest deck material to own long-term?
Capped composite for most homeowners — high upfront cost but the lowest maintenance and a 25–30 year life with no mid-life replacement. PVC is comparable and pulls ahead around pools and on the coast where moisture is severe. Pressure-treated is only the cheapest to own if you'll sell within a few years before the maintenance and replacement costs accrue.
How much does deck maintenance cost per year?
Roughly $0.45 per square foot per year for pressure-treated wood (re-staining every ~2 years), about $0.35 for cedar, and only about $0.05 for composite or PVC (wash only). On a 320 sqft deck that's about $144/year for PT versus about $16/year for composite — the gap compounds over the life of the deck.
Should I replace or refinish my old deck?
Refinish if the framing and fasteners are sound and only the surface looks tired — sanding and re-staining wood, or replacing surface boards on solid framing, is far cheaper than a full rebuild. Replace if the framing, ledger, or footings are compromised. DeckMath's refinishing and resurface-vs-rebuild calculators compare the two paths with 2026 pricing.
Does total cost of ownership change which deck I should buy?
It should. If you'll own the deck 5 years, optimize for upfront price — pressure-treated is rational. If you'll own it 15+ years, optimize for lifetime cost — composite or PVC almost always wins once maintenance and replacement are included. The common mistake is buying PT to save upfront on a deck you'll own for decades, then paying more in stain and rebuilds than composite would have cost.
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