Patio vs Deck: Cost, Upkeep and Resale Value

The choice usually gets made backwards. Somebody decides they want a deck, then discovers the yard is dead flat and ends up with a 14-inch platform that looks like a stage over a dark, damp void. Or they pour a patio against a house sitting low in its grade, and every storm afterwards runs water at the siding.

Ground level settles this argument far more often than taste does. Get the grade right and the cost, drainage and permit questions largely answer themselves. Across the outdoor costs we track on HomePlusDeals.Com, this is the most expensive decision in a back-garden project — and the one most often made on a showroom floor rather than in the yard with a tape measure.

Let the grade choose for you

Two measurements decide it, and both come before you price anything. Measure from the bottom of your back door threshold straight down to the soil. Then run a string with a line level 20 feet out into the yard and measure the drop at the far end.

• Threshold within about 8 inches of grade, and under roughly 6 inches of fall across the area you want — build a patio. A deck here buys you nothing but a step and a place for leaves to rot.
• Threshold 2 feet or more above grade, or the ground drops more than a foot over 20 feet — build a deck. Holding that slope back for a patio means a retaining wall, and a wall over 4 feet tall generally needs an engineer’s design and its own permit.
• Anywhere in between — either works, so cost and maintenance decide.

The reason is arithmetic. A deck spans a falling grade on posts and footings for very little money. A patio needs the ground brought up to it, and fill, compaction and retaining are expensive by the cubic yard.

What each one actually costs

These are the installed ranges we work from on HomePlusDeals.Com — ranges, not quotes. They move with region, access and how much labour you take on, and the base you cannot see costs much the same whether you finish it with $4 gravel or $40 bluestone.

Against the garden bands we publish — a tidy-up at $150 to $800, mid-range at $3,000 to $10,000, a full landscape at $18,000 to $45,000 and up — a 300-square-foot surface comes in under the mid-range band in gravel ($1,200 to $2,400), sits inside it in concrete pavers ($3,600 to $7,500), and reaches full-landscape money as a composite deck ($15,000 to $27,000).

The national figures, and what they leave out

For a contractor-built reference point, the 2025 Cost vs. Value report is the most methodologically serious number available. Its wood deck project specifies a 16-by-20-foot deck on pressure-treated joists over 4x4 posts and concrete piers, with a built-in bench, a planter and three steps to grade: $18,263 nationally, recouping 94.9% at resale. The same deck in composite costs $25,096 and recoups 88.5%. That footprint is 320 square feet, so the arithmetic lands near $57 and $78 a square foot — my division, not a published figure, and it carries a contractor’s markup and stairs.

Patios fare worse there. The Backyard Patio project averages $51,454 and recoups 46%, the weakest return of any outdoor project listed. Read that not as “patios are a bad investment” but as a warning about elaborate, fully built-out ones. A plain, well-drained slab off the back door is a different project entirely, at a fraction of the money.

One correction to all of it: those figures published in September 2025, and NAHB reported building material costs up 6.7% in the twelve months to July 2026, with builders doing five or fewer starts a year reporting a 9.1% median increase. Small contractors buy at the worst end of that, so budget above the 2025 numbers, not at them.

The maintenance you are signing up for

Lifespan figures hide the real difference: the two fail in completely different ways.

A patio settles. Pavers on a compacted base of 4 to 6 inches of crushed stone, placed in 2- to 3-inch lifts and compacted between each, stay put for decades; laid on 2 inches of loose sand over topsoil they dip within two winters. The repair is easy, though — lift the pavers, add base, relay. A poured slab cracks instead, and a crack is permanent unless you saw-cut and replace the panel.

A deck rots and loosens. Pressure-treated boards cup and check on their own schedule, and fasteners matter as much as the wood: modern treatment chemistry is corrosive to plain zinc, so hot-dip galvanised or stainless is not an upgrade, it is the requirement. Composite solves the board problem and none of the frame problem — underneath a $78-a-square-foot surface sits an ordinary pressure-treated frame with an ordinary service life.

Sealing a deck is the same job as any good paint job: prep decides the result, not the product. The discipline in our guide to painting a room like a pro transfers straight outdoors — skip it and you recoat annually rather than every third year. Choosing decking boards is the outdoor version of the trade-off in the best flooring for every room: traffic, water, weekends.

Drainage, which is the whole ballgame

Get this wrong and none of the rest matters.

• Slope a patio 1/4 inch per foot away from the house — 2%. Over a 12-foot-deep patio that is 3 inches of fall, so decide where those 3 inches go before you set the first paver. On very smooth finishes you can drop to 1/8 inch per foot, no less.
• Keep the finished surface at least 6 inches below the sill plate, with foundation still visible. Raising a patio flush with the threshold because it looks neat is how water gets into framing.
• Poured slabs want 4 inches of thickness over that base, with control joints cut within the first 6 to 12 hours at a spacing in feet of two to three times the thickness in inches — so 8 to 12 feet apart. Concrete cracks; joints decide where.
• A deck drains itself through 1/8- to 1/4-inch board gaps, its real advantage on a wet site. The risk moves to the ledger, which must be flashed — behind the house wrap, over the ledger, with a drip edge — and through-bolted or lagged, never nailed. Ledger failure is the commonest cause of deck collapse, and it rots the house quietly for years first.
• Slope the ground under a deck away too — a deck is not a roof.

Permits, setbacks and the 30-inch line

Attached decks need a permit almost everywhere, and freestanding ones usually do too. The figures an inspector checks are consistent across the model codes: a guard wherever the walking surface sits more than 30 inches above grade, residential guards 36 inches high, balusters that will not pass a 4-inch sphere, and stairs with risers no greater than 7 3/4 inches and treads of at least 10 inches, uniform within 3/8 inch across the flight.

Patios at grade are often exempt from a building permit — never from zoning. Setbacks apply, and a growing number of towns cap impervious surface as a share of lot area, which a 400-square-foot slab can breach on a small lot. Call the department before you order concrete. As the International Code Council explains to homeowners, a permit is legal permission to build in accordance with approved drawings — and that inspection record is what a buyer’s attorney asks for later. An unpermitted deck resurfaces at closing.

What I would skip

The built-in bench and planter. They are in the Cost vs. Value spec and in most contractor proposals, and they rot first, because they hold standing water against end grain. Buy movable furniture and put the money into better boards.

Composite on anything under 30 inches high. A step or two above grade and you are paying deck money for what the ground could do free. Pour a slab or lay pavers, spend the difference on finish.

Stamped concrete pretending to be stone. The pattern is regular; the crack that eventually crosses it will not be. Pavers give the same look and can be lifted and relaid.

A wood deck on the shaded north side, under trees. You will scrub algae off it every spring for as long as you own the house. Pavers there, deck where the sun reaches.

One on technique: keep the pressure washer under 1,500 psi with a wide fan tip. Higher pressure erodes the soft spring wood and leaves a furry surface that drinks water.

When not to do it yourself

Ledger attachment, and any structure over 30 inches up, should go to someone insured — or be built freestanding on its own posts so there is no ledger at all; the failure mode is a collapse with people on it. A single concrete pour over about 200 square feet beats amateurs on time, not skill, because the mix goes off on its own schedule. Retaining over 4 feet needs an engineer.

The rest is within reach. Pavers are the DIY route precisely because there is no clock — lay 40 square feet on a Saturday and stop. Most of what the job needs is in our essential DIY tool kit for a first home, plus a rented plate compactor for a day.

And the cheapest right answer is often the one nobody quotes for: gravel over a compacted base with proper steel edging, $4 to $8 a square foot. It drains perfectly, costs a tenth of stone, and if you want pavers in three years the base is already there.

So, which one

Flat yard, low threshold, no appetite for annual upkeep: patio, in pavers if you can stretch to them. Sloping yard or a door well above grade: deck, pressure-treated frame, and be realistic about the sealing cycle.

The pattern holds across every category we cost out — the same thing we found breaking down what a kitchen remodel really costs. The structural decision made in week one sets most of the budget; the finish everybody argues about sets very little of it. The other home decor and outdoor living guides work the same way round: grade, drainage and base first, then the pretty part.

If you want the numbers behind any of this, the cost bands for every room and every outdoor project sit on the front page of HomePlusDeals.Com, updated as material prices move.