How much does it cost to build a deck?
A typical deck costs $15 to $30 per square foot for pressure-treated wood and $30 to $60 for composite, installed. A common 200–400 sq ft deck lands between $5,000 and $20,000, with height, railings, stairs, and material driving the range.
Wood or composite decking — which is better?
Wood costs less up front but needs regular sealing and staining and has a shorter life. Composite costs more initially but resists rot, fading, and splinters and needs almost no upkeep, often making it the better value over 20+ years. If you hate maintenance, composite usually wins; if budget is tight, wood does.
Do I need a permit to build a deck?
Almost always, yes — decks are structures people stand on, so most jurisdictions require a permit and inspection to verify footings, attachment, and railings. A reputable builder handles this. Skipping the permit risks fines, insurance problems, and complications when you sell.
How long does a composite deck last?
Composite and PVC decking typically last 25 to 30+ years with minimal maintenance, versus about 15 years for a well-maintained wood deck. The structural frame underneath (often pressure-treated wood) also affects overall lifespan, so quality framing matters regardless of the decking surface.
Deck or patio — which should I build?
A raised deck suits sloped yards and second-story access and creates a distinct 'room' outdoors. A ground-level patio in pavers or concrete costs less to maintain and works well on flat ground. Budget, yard grade, and how you'll use the space usually make the choice clear.
Can an old deck be repaired instead of replaced?
Often, yes — replacing a few boards, resealing, or upgrading railings can extend a deck's life for far less than rebuilding. But if the framing, ledger, or footings are compromised, replacement is the safe choice. A builder should inspect the structure, not just the surface, before advising.
How long does it take to build a deck?
Most residential decks take 1 to 3 weeks to build, depending on size, height, material, and permit timing. Simple ground-level decks go faster; multi-level decks with built-in features and complex railings take longer.
› Read the full Decks & Patios guide