An uncovered deck gets used about 60 days a year in most US climates. The same deck with a roof gets used 250 days a year and adds roughly 70% of its construction cost to home resale value. Smart covered deck plans account for sun angles, drainage, post placement, and connection to the house in ways most stock plans miss. After designing and building covered decks across three climate zones, I have a clear sense of which layouts hold up, which roof systems are worth the upcharge, and where most homeowners overspend.
Part of our Decks & Outdoor guide — explore the full guide →
Three Roof Styles to Choose Between
Every covered deck starts with a roof decision, and the three workhorse styles are gable, shed, and pergola. A gable roof matches most house architectures and provides a tall, open feeling underneath. A shed roof attaches to the house with a single slope and is the cheapest framed option. A solid-roof pergola or louvered pergola (Struxure, StruXure, or similar) offers adjustable shading without a fully enclosed feel.
Gable roofs cost roughly $40-$60 per square foot of covered area. Shed roofs run $30-$45 per square foot. Louvered pergolas hit $90-$140 per square foot installed — the premium option for homeowners who want adjustable sun control.
Standard Sizes That Work
Three deck footprints solve most residential use cases:
- 12×16 ft (192 sq ft): outdoor dining for 6-8 people
- 16×20 ft (320 sq ft): dining plus a separate seating area
- 20×24 ft (480 sq ft): dining, seating, and an outdoor kitchen zone
The 16×20 layout is the sweet spot for most homes. It fits two distinct furniture zones (a dining table for 6 and a small conversation seating group), accepts a standard ceiling fan installation, and stays under the 500 sq ft threshold that triggers more aggressive permit requirements in many municipalities.
Foundation and Post Spacing
Covered decks demand stiffer foundations than open ones because of wind uplift on the roof. Post footings should be 24-36 inches in diameter and extend below frost depth — 42 inches in northern climates, 24 inches in temperate zones, and surface-level on slabs in frost-free areas. Use 6×6 PT posts on bases set in concrete with brackets like Simpson CBSQ or ABU66 — never pour concrete directly around the post.
Post spacing should not exceed 10 feet. Closer spacing means smaller beams and rafters, which keeps the structure lighter and the roofline less massive. For a 16×20 deck, four perimeter posts plus one center post on the long beam is the standard layout.
Framing the Deck Surface
2×10 PT pressure-treated joists on 16-inch centers handle most covered deck spans up to 14 feet. For longer spans, jump to 2×12 joists or shorten the run with an intermediate beam. Use joist hangers (Simpson LUS210Z) rather than toenailing — covered decks see lateral loads from wind that require positive connections.
Decking material choice changes the long-term experience dramatically. PT decking is $1.50-$2.50 per square foot but requires staining every 2-3 years. Composite decking like Trex Transcend runs $4-$6 per square foot and needs only occasional washing. PVC decking such as AZEK or TimberTech is $5-$8 per square foot and is fully waterproof — useful for second-story decks where you want a dry zone below.
Connecting the Roof to the House
The ledger connection between the new deck roof and the existing house siding is the most common failure point in covered deck projects. Done wrong, it leaks for years before the homeowner notices rot inside the wall.
The correct method: cut back the siding, install a Z-flashing kink at the wall, lag-bolt a treated 2x ledger through siding into the house framing, then install a continuous head flashing that tucks under the siding and over the ledger. Caulk every bolt head with polyurethane sealant.
If your house has stucco, brick, or stone siding, do not lag-bolt directly into the cladding. Run independent posts immediately adjacent to the house instead — this avoids the waterproofing nightmare of penetrating masonry.
Roofing Materials
Match the deck roof material to the existing house roof when possible:
- Asphalt shingles: $5-$8 per sq ft installed, matches most residential houses
- Metal standing seam: $12-$18 per sq ft, low maintenance, modern look
- Polycarbonate panels: $4-$7 per sq ft, lets light through, casual aesthetic
- Cedar shake: $10-$15 per sq ft, premium look, requires more maintenance
Polycarbonate is worth a closer look. It transmits about 90% of natural light while blocking UV, which means the room below the deck (often a basement walk-out) stays bright. The downside is sound — heavy rain on polycarbonate is louder than on shingles.
Posts, Beams, and Headroom
Plan for at least 7 feet of finished ceiling height under the roof, ideally 8-9 feet. Lower than 7 feet feels cramped, especially with a ceiling fan installed. The beam-to-rafter connection eats 8-10 inches of vertical space, so the top of the post should sit 8-10 inches above your desired ceiling height.
Posts can be left as exposed 6×6 PT timber, wrapped in cedar or PVC for a finished column look, or trimmed into a tapered column profile. Tapered columns are the upgrade detail that makes a $30,000 deck read as a $50,000 deck.
Drainage and Gutters
A covered deck without gutters channels runoff straight onto whatever sits below — usually patio furniture or the yard, eventually eroding the area near the foundation. Install K-style aluminum gutters along the eave edge and route downspouts at least 6 feet away from the house with rigid PVC extensions.
If the deck roof drains toward the house wall, install a cricket — a small triangular framed slope — at the wall connection to divert water sideways to a downspout. This prevents water from pooling against the siding and finding its way through the ledger flashing.
Lighting and Ceiling Finish
Plan electrical before framing the ceiling. Standard package for a 16×20 deck: 6 recessed cans, one ceiling fan rough-in, two GFCI outlets in posts, and two switched wall sconces by the house door. Run conduit through the joist bays before installing the ceiling material.
Ceiling finish options: tongue-and-groove cedar ($4-$6 per sq ft) for a warm look, PVC beadboard ($3-$5 per sq ft) for a maintenance-free white ceiling, or simply paint the exposed rafters and roof sheathing ($1-$2 per sq ft) for a budget approach. T&G cedar reads as a premium detail and ages beautifully with a clear preservative finish.
Realistic Budget for a 16×20 Covered Deck
Honest pricing for the most common build:
- Framing materials (PT and engineered): $4,000-$5,500
- Decking (composite): $2,000-$2,500
- Roof framing and shingles: $3,500-$4,500
- T&G cedar ceiling: $1,800-$2,200
- Electrical rough and fixtures: $1,500-$2,500
- Permits and inspections: $300-$800
- Labor (if contracted): $12,000-$18,000
Total DIY cost: $13,000-$18,000. Total contractor cost: $25,000-$35,000. Good covered deck plans pay for themselves with daily use over the life of the home — done well, this is one of the few exterior upgrades that genuinely makes you spend more time outside.
