· 7 min read
Paver Patio Cost Per Square Foot in King County
Quick answer
Installed paver patios in King County typically run $22 to $30 per square foot for standard concrete pavers, $30 to $45 for large-format or premium lines, and $38 to $60 for dry-set natural flagstone. A 400-square-foot patio therefore lands around $9,000 to $18,000. Base depth, site access and drainage move the number most.
A patio price per square foot covers a whole stack of work you never see again once the surface is down: excavation, separation fabric, several inches of compacted crushed rock, a screeded bedding course, the pavers, edge restraint and jointing sand. Two bids can sit eight dollars a foot apart and both be honest, because one is building nine inches of base and the other is building four. This is what patios run in King County in 2026, decomposed far enough that you can tell which kind of bid you are holding.
Installed ranges by surface material
Everything below is a complete installed cost for a residential patio at grade with reasonable access: labor, base, materials and cleanup. Concrete is included for comparison because it is the alternative most people are weighing.
| Surface | Installed range | Unit | Notes |
|---|---|---|---|
| Standard concrete paver, running bond or herringbone | $22-$30 | per sq ft | Mutual Materials Holland, Basalite Cobblestone and similar stocked lines |
| Premium or large-format slab paver | $30-$45 | per sq ft | Techo-Bloc Blu 60, Belgard Mega-Arbel; more cutting, tighter tolerance |
| Permeable paver system | $28-$45 | per sq ft | Open-graded stone section, deeper excavation, no fines anywhere in the build |
| Dry-set natural flagstone | $38-$60 | per sq ft | Basalt, bluestone and quartzite; hand-fit with a high waste factor |
| Poured concrete slab, broom finish | $14-$22 | per sq ft | Cheapest up front and it will crack somewhere in this climate |
| Stamped and colored concrete | $20-$30 | per sq ft | Needs resealing every two to three years to hold color |
So a 400-square-foot patio, roughly a 20 by 20, lands between about $8,800 and $12,000 in a standard concrete paver and $12,000 to $18,000 in a large-format line. That is the finished build, not a pallet count.
What one square foot is actually made of
It helps to see the number pulled apart, because the parts that get trimmed to win a bid are always the invisible ones. These are rough proportions on a mid-sized South King County patio built at a 9 to 12 inch excavation with a standard concrete paver.
| Component | Share of installed cost | Typical per sq ft |
|---|---|---|
| Excavation, spoil haul-off and dump fees | 15-20% | $3.50-$6.00 |
| Woven separation geotextile over the subgrade | 2-3% | $0.45-$0.90 |
| Crushed 5/8-inch minus base, placed in lifts and compacted | 18-25% | $4.50-$7.50 |
| Screeded bedding course of clean angular chip | 3-5% | $0.90-$1.60 |
| Paver units delivered | 20-30% | $5.00-$11.00 |
| Wet-saw cutting, edge restraint and soldier course | 8-12% | $2.00-$3.50 |
| Polymeric jointing sand, swept and activated | 3-5% | $0.75-$1.50 |
| Layout, compaction labor, cleanup and mobilization | 15-20% | $3.50-$6.00 |
Six things that move your per-foot number
- Access. A backyard a wheelbarrow can reach straight off the driveway costs what the table says. One reached through a 36-inch gate means every ton of rock goes in by hand and every ton of spoil comes back out the same way. On tight lots in Ballard, Capitol Hill and the older Renton neighborhoods this single factor can add $4 to $8 per square foot.
- Subgrade. Alderwood till compacts beautifully. Valley-floor alluvium in Kent and Auburn sometimes does not. If the exposed subgrade rebounds or pumps water behind a plate compactor, it has to be over-excavated and replaced with structural rock at roughly $60 to $95 per cubic yard all in. This is the most common change order on a King County patio.
- Shape. Curves, radii, inset borders and anything meeting a round fire feature multiply wet-saw time. A rectangle in running bond is the cheapest thing anyone can install. A 45-degree herringbone field with a double soldier course and a curved outer edge can add 15 to 25 percent in labor on identical pavers.
- Grade change. If the patio has to come up to a door threshold or step down to lawn, you are buying retaining and steps as well as surface. Seat walls run $65 to $110 per linear foot and block steps $450 to $900 each. Those belong on their own lines, never folded into a square-foot rate.
- Drainage. Downspouts get piped under the field, not spilled onto it. A channel drain across the low side of a walkout runs $45 to $85 per linear foot including the piped outfall, and against a basement wall it is not optional.
- Size. Small patios cost more per foot than big ones. Mobilization, layout, machine delivery and a minimum compaction pass are close to fixed no matter how much field there is to spread them across.
How size changes the per-foot number
That last point catches people who scale a quote up or down in their head. Here is roughly how it plays out on a standard concrete paver with driveway access and no over-excavation.
| Patio size | Typical installed total | Effective per sq ft | Days on site |
|---|---|---|---|
| 150 sq ft landing | $4,800-$6,600 | $32-$44 | 2-3 |
| 300 sq ft | $7,500-$10,200 | $25-$34 | 3-4 |
| 500 sq ft | $11,500-$15,500 | $23-$31 | 4-5 |
| 800 sq ft | $17,600-$24,000 | $22-$30 | 5-7 |
| 1,200 sq ft | $25,200-$34,800 | $21-$29 | 7-10 |
Priced separately, every time
- Fire feature, either a gas fire bowl or a seat-wall fire table: $3,500 to $9,000 installed, depending on whether gas has to be run to it.
- Gas line from the meter, trenched and pressure-tested by a licensed gas fitter: $900 to $2,600.
- Low-voltage lighting, meaning hardscape lights recessed under the seat wall cap and path lights around the field: $120 to $260 per fixture installed, transformer and wire included.
- Zone 8b beds framing the patio edge with sword fern, hebe, carex, kinnikinnick and low hydrangea, plus repair of lawn where machines tracked: $18 to $32 per square foot planted.
- Demolition and disposal of an existing slab: $4 to $9 per square foot, at the high end when it turns out to have wire mesh or rebar in it.
- A permeable build instead of a standard one, when impervious surface totals on your parcel are tight.
The King County conditions that show up on the invoice
Two local realities carry real dollars. The first is the till. Much of Kent, Covington and Renton sits on a cemented Alderwood hardpan that water perches on rather than percolates through, so a patio here needs positive pitch to a real outlet and, on the worst sites, a perforated edge drain in washed rock at the downhill side of the base. The second is the wet season. The valley floor takes 38 to 45 inches of rain a year and the foothill edge toward Maple Valley and Issaquah can see four to six feet, spread over eight months. That is what turns a marginal base into a wavy patio, and it is also why moss finds any joint you neglect.
Regulation can add cost too, though usually less than people fear. An at-grade patio is generally exempt from a building permit in Kent and neighboring South King County cities. What triggers review is cumulative impervious surface, work inside a critical area or wetland buffer, retaining any grade over four feet, or a patio raised high enough to be treated as a deck. Adding on the order of 2,000 square feet of new plus replaced hard surface is where the King County Surface Water Design Manual pulls a project into fuller review, and most cities here run an adopted version of it. Confirm the current thresholds with your own jurisdiction before you finalize a footprint, since cities update these on their own schedules.
Getting the most patio for the money
- Spend on the base and save on the paver. A plain Mutual Materials Holland field on twelve inches of properly compacted rock will outlast a premium slab set on four.
- Build the full footprint now. Extending a patio later costs more per foot than the first phase did, and the color lot will not match no matter how carefully you order.
- Sleeve for gas, power and irrigation before the base goes in. Two lengths of conduit under the field cost almost nothing on the day and thousands to retrofit.
- Skip the intricate pattern. Running bond laid dead flat with a clean soldier course reads better than a complicated layout sitting on a mediocre base.
- Keep the seat wall and fire feature in the same mobilization. The crew, the machine and the wet saw are already on your property.
Frequently asked questions
Can I buy the pavers myself and just hire the labor?
You can, and supply-only paver pricing at Seattle-area yards generally runs $3.50 to $9.50 per square foot depending on line. Most installers will not warranty owner-supplied material, because breakage, color lot mismatches and a short order all become their scheduling problem. Order at least 7 to 10 percent overage for cuts. In practice the savings are smaller than people expect once delivery and the missing warranty are priced in.
What does a paver patio cost to maintain?
Very little annually, something every several years. Re-sanding the joints with polymeric sand runs about $1.50 to $3.50 per square foot and is typically needed every five to eight years in this climate. Sealing is optional at $1 to $2.50 per square foot and mostly a color decision. The free maintenance matters more: blow fir needles and maple leaf litter off a few times each fall so organic matter never composts in the joints.
Can pavers go over an existing concrete slab?
Sometimes, and it is worth asking about. If the slab is structurally sound, not heaving, and already pitched away from the house, an overlay of thin pavers set on a bedding course typically runs $14 to $22 per square foot, well under a full rebuild. If the slab is cracked and moving, or pitched toward the house, the overlay just inherits every one of those problems and a rebuild is the honest answer.
Does a patio add value to a King County home?
Appraisers treat outdoor living space as an amenity rather than a dollar-for-dollar addition, so nobody should expect a line-item return. What it does reliably is make a house show better in a region where the yard is unusable for a good part of the year. A dry, level, well-drained patio reads as maintained. A cracked slab with moss in it reads as deferred work, and buyers price that.
Is it cheaper to have a patio built in winter?
Material and disposal costs do not move seasonally, so the savings are not on the invoice. What changes is availability. Lead times from June through September are long across the whole Puget Sound market, and late fall through early spring is far easier to schedule. The tradeoff is the subgrade: a saturated site will not compact properly, so on heavy till we would rather wait for a dry window than hide a bad base under good pavers.